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Ortiz C, Pearson A, McCartan R, Roche S, Carothers N, Browning M, Perez S, He B, Ginsberg SD, Mullan M, Mufson EJ, Crawford F, Ojo J. Overexpression of pathogenic tau in astrocytes causes a reduction in AQP4 and GLT1, an immunosuppressed phenotype and unique transcriptional responses to repetitive mild TBI without appreciable changes in tauopathy. J Neuroinflammation 2024; 21:130. [PMID: 38750510 PMCID: PMC11096096 DOI: 10.1186/s12974-024-03117-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Accepted: 04/30/2024] [Indexed: 05/18/2024] Open
Abstract
Epidemiological studies have unveiled a robust link between exposure to repetitive mild traumatic brain injury (r-mTBI) and elevated susceptibility to develop neurodegenerative disorders, notably chronic traumatic encephalopathy (CTE). The pathogenic lesion in CTE cases is characterized by the accumulation of hyperphosphorylated tau in neurons around small cerebral blood vessels which can be accompanied by astrocytes that contain phosphorylated tau, the latter termed tau astrogliopathy. However, the contribution of tau astrogliopathy to the pathobiology and functional consequences of r-mTBI/CTE or whether it is merely a consequence of aging remains unclear. We addressed these pivotal questions by utilizing a mouse model harboring tau-bearing astrocytes, GFAPP301L mice, subjected to our r-mTBI paradigm. Despite the fact that r-mTBI did not exacerbate tau astrogliopathy or general tauopathy, it increased phosphorylated tau in the area underneath the impact site. Additionally, gene ontology analysis of tau-bearing astrocytes following r-mTBI revealed profound alterations in key biological processes including immunological and mitochondrial bioenergetics. Moreover, gene array analysis of microdissected astrocytes accrued from stage IV CTE human brains revealed an immunosuppressed astroglial phenotype similar to tau-bearing astrocytes in the GFAPP301L model. Additionally, hippocampal reduction of proteins involved in water transport (AQP4) and glutamate homeostasis (GLT1) was found in the mouse model of tau astrogliopathy. Collectively, these findings reveal the importance of understanding tau astrogliopathy and its role in astroglial pathobiology under normal circumstances and following r-mTBI. The identified mechanisms using this GFAPP301L model may suggest targets for therapeutic interventions in r-mTBI pathogenesis in the context of CTE.
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Affiliation(s)
- Camila Ortiz
- The Roskamp Institute, Sarasota, FL, USA.
- The Open University, Milton Keynes, UK.
| | - Andrew Pearson
- The Roskamp Institute, Sarasota, FL, USA
- The Open University, Milton Keynes, UK
| | | | | | | | | | | | - Bin He
- Barrow Neurological Institute, Phoenix, AZ, USA
| | - Stephen D Ginsberg
- Center for Dementia Research, Nathan Kline Institute, Orangeburg, NY, USA
- Departments of Psychiatry, Neuroscience and Physiology, and NYU Neuroscience Institute, New York University Grossman School of Medicine, New York, NY, USA
| | | | | | - Fiona Crawford
- The Roskamp Institute, Sarasota, FL, USA
- The Open University, Milton Keynes, UK
- James A. Haley Veterans Hospital, Tampa, FL, USA
| | - Joseph Ojo
- The Roskamp Institute, Sarasota, FL, USA
- The Open University, Milton Keynes, UK
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2
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Vasović DD, Ivković S, Živanović A, Major T, Milašin JM, Nikolić NS, Simonović JM, Šutulović N, Hrnčić D, Stanojlović O, Vesković M, Rašić DM, Mladenović D. Reduced light exposure mitigates streptozotocin-induced vascular changes and gliosis in diabetic retina by an anti-inflammatory effect and increased retinal cholesterol turnover. Chem Biol Interact 2024; 394:110996. [PMID: 38593908 DOI: 10.1016/j.cbi.2024.110996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2024] [Revised: 04/02/2024] [Accepted: 04/04/2024] [Indexed: 04/11/2024]
Abstract
Diabetic retinopathy is not cured efficiently and changes of lifestyle measures may delay early retinal injury in diabetes. The aim of our study was to investigate the effects of reduced daily light exposure on retinal vascular changes in streptozotocin (STZ)-induced model of DM with emphasis on inflammation, Aqp4 expression, visual cycle and cholesterol metabolism-related gene expression in rat retina and RPE. Male Wistar rats were divided into the following groups: 1. control; 2. diabetic group (DM) treated with streptozotocin (100 mg/kg); 3. group exposed to light/dark cycle 6/18 h (6/18); 4. diabetic group exposed to light/dark cycle 6/18 h (DM+6/18). Retinal vascular abnormalities were estimated based on lectin staining, while the expression of genes involved in the visual cycle, cholesterol metabolism, and inflammation was determined by qRT-PCR. Reduced light exposure alleviated vasculopathy, gliosis and the expression of IL-1 and TNF-α in the retina with increased perivascular Aqp4 expression. The expression of genes involved in visual cycle and cholesterol metabolism was significantly up-regulated in RPE in DM+6/18 vs. DM group. In the retina only the expression of APOE was significantly higher in DM+6/18 vs. DM group. Reduced light exposure mitigates vascular changes and gliosis in DM via its anti-inflammatory effect, increased retinal cholesterol turnover and perivascular Aqp4 expression.
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Affiliation(s)
- Dolika D Vasović
- Eye Hospital, University Clinical Centre of Serbia, 11000, Belgrade, Serbia
| | - Sanja Ivković
- Department of Molecular Biology and Endocrinology, Vinca - Institute for Nuclear Sciences, National Institute of Republic of Serbia, University of Belgrade, 11000, Belgrade, Serbia
| | - Ana Živanović
- Department of Molecular Biology and Endocrinology, Vinca - Institute for Nuclear Sciences, National Institute of Republic of Serbia, University of Belgrade, 11000, Belgrade, Serbia
| | - Tamara Major
- Department of Pharmacology, Faculty of Pharmacy, University of Belgrade, 11000, Belgrade, Serbia
| | - Jelena M Milašin
- Department of Human Genetics, School of Dental Medicine, University of Belgrade, 11000, Belgrade, Serbia
| | - Nađa S Nikolić
- Department of Human Genetics, School of Dental Medicine, University of Belgrade, 11000, Belgrade, Serbia
| | - Jelena M Simonović
- Department of Human Genetics, School of Dental Medicine, University of Belgrade, 11000, Belgrade, Serbia
| | - Nikola Šutulović
- Laboratory for Neurophysiology, Institute of Medical Physiology "Richard Burian", Faculty of Medicine, University of Belgrade, 11000, Belgrade, Serbia
| | - Dragan Hrnčić
- Laboratory for Neurophysiology, Institute of Medical Physiology "Richard Burian", Faculty of Medicine, University of Belgrade, 11000, Belgrade, Serbia
| | - Olivera Stanojlović
- Laboratory for Neurophysiology, Institute of Medical Physiology "Richard Burian", Faculty of Medicine, University of Belgrade, 11000, Belgrade, Serbia
| | - Milena Vesković
- Institute of Pathophysiology "Ljubodrag Buba Mihailovic", Faculty of Medicine, University of Belgrade, 11000, Belgrade, Serbia
| | - Dejan M Rašić
- Eye Hospital, University Clinical Centre of Serbia, 11000, Belgrade, Serbia; School of Medicine, University of Belgrade, 11000, Belgrade, Serbia
| | - Dušan Mladenović
- Institute of Pathophysiology "Ljubodrag Buba Mihailovic", Faculty of Medicine, University of Belgrade, 11000, Belgrade, Serbia.
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3
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Giannetto MJ, Gomolka RS, Gahn-Martinez D, Newbold EJ, Bork PAR, Chang E, Gresser M, Thompson T, Mori Y, Nedergaard M. Glymphatic fluid transport is suppressed by the aquaporin-4 inhibitor AER-271. Glia 2024; 72:982-998. [PMID: 38363040 DOI: 10.1002/glia.24515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 01/29/2024] [Accepted: 02/05/2024] [Indexed: 02/17/2024]
Abstract
The glymphatic system transports cerebrospinal fluid (CSF) into the brain via arterial perivascular spaces and removes interstitial fluid from the brain along perivenous spaces and white matter tracts. This directional fluid flow supports the clearance of metabolic wastes produced by the brain. Glymphatic fluid transport is facilitated by aquaporin-4 (AQP4) water channels, which are enriched in the astrocytic vascular endfeet comprising the outer boundary of the perivascular space. Yet, prior studies of AQP4 function have relied on genetic models, or correlated altered AQP4 expression with glymphatic flow in disease states. Herein, we sought to pharmacologically manipulate AQP4 function with the inhibitor AER-271 to assess the contribution of AQP4 to glymphatic fluid transport in mouse brain. Administration of AER-271 inhibited glymphatic influx as measured by CSF tracer infused into the cisterna magna and inhibited increases in the interstitial fluid volume as measured by diffusion-weighted MRI. Furthermore, AER-271 inhibited glymphatic efflux as assessed by an in vivo clearance assay. Importantly, AER-271 did not affect AQP4 localization to the astrocytic endfeet, nor have any effect in AQP4 deficient mice. Since acute pharmacological inhibition of AQP4 directly decreased glymphatic flow in wild-type but not in AQP4 deficient mice, we foresee AER-271 as a new tool for manipulation of the glymphatic system in rodent brain.
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Affiliation(s)
- Michael J Giannetto
- Center for Translational Neuromedicine, University of Rochester Medical Center, Rochester, New York, USA
- Department of Neuroscience, University of Rochester Medical Center, Rochester, New York, USA
| | - Ryszard S Gomolka
- Center for Translational Neuromedicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Daniel Gahn-Martinez
- Center for Translational Neuromedicine, University of Rochester Medical Center, Rochester, New York, USA
| | - Evan J Newbold
- Center for Translational Neuromedicine, University of Rochester Medical Center, Rochester, New York, USA
- Department of Neuroscience, University of Rochester Medical Center, Rochester, New York, USA
| | - Peter A R Bork
- Department of Physics, Technical University of Denmark, Lyngby, Denmark
| | - Ethan Chang
- Center for Translational Neuromedicine, University of Rochester Medical Center, Rochester, New York, USA
| | | | | | - Yuki Mori
- Center for Translational Neuromedicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Maiken Nedergaard
- Center for Translational Neuromedicine, University of Rochester Medical Center, Rochester, New York, USA
- Center for Translational Neuromedicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Ernstsen CV, Ranieri M, Login FH, Mahmoud IK, Therkildsen JR, Valenti G, Praetorius H, Nørregaard R, Nejsum LN. Regulation of renal aquaporin water channels in acute pyelonephritis. Am J Physiol Cell Physiol 2024; 326:C1451-C1461. [PMID: 38525539 DOI: 10.1152/ajpcell.00308.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 02/28/2024] [Accepted: 03/11/2024] [Indexed: 03/26/2024]
Abstract
Acute pyelonephritis (APN) is most frequently caused by uropathogenic Escherichia coli (UPEC), which ascends from the bladder to the kidneys during a urinary tract infection. Patients with APN have been reported to have reduced renal concentration capacity under challenged conditions, polyuria, and increased aquaporin-2 (AQP2) excretion in the urine. We have recently shown increased AQP2 accumulation in the plasma membrane in cell cultures exposed to E. coli lysates and in the apical plasma membrane of inner medullary collecting ducts in a 5-day APN mouse model. This study aimed to investigate if AQP2 expression in host cells increases UPEC infection efficiency and to identify specific bacterial components that mediate AQP2 plasma membrane insertion. As the transepithelial water permeability in the collecting duct is codetermined by AQP3 and AQP4, we also investigated whether AQP3 and AQP4 localization is altered in the APN mouse model. We show that AQP2 expression does not increase UPEC infection efficiency and that AQP2 was targeted to the plasma membrane in AQP2-expressing cells in response to the two pathogen-associated molecular patterns (PAMPs), lipopolysaccharide and peptidoglycan. In contrast to AQP2, the subcellular localizations of AQP1, AQP3, and AQP4 were unaffected both in lysate-incubated cell cultures and in the APN mouse model. Our finding demonstrated that cellular exposure to lipopolysaccharide and peptidoglycan can trigger the insertion of AQP2 in the plasma membrane revealing a new regulatory pathway for AQP2 plasma membrane translocation, which may potentially be exploited in intervention strategies.NEW & NOTEWORTHY Acute pyelonephritis (APN) is associated with reduced renal concentration capacity and increased aquaporin-2 (AQP2) excretion. Uropathogenic Escherichia coli (UPEC) mediates changes in the subcellular localization of AQP2 and we show that in vitro, these changes could be elicited by two pathogen-associated molecular patterns (PAMPs), namely, lipopolysaccharide and peptidoglycan. UPEC infection was unaltered by AQP2 expression and the other renal AQPs (AQP1, AQP3, and AQP4) were unaltered in APN.
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Affiliation(s)
| | - Marianna Ranieri
- Department of Biosciences, Biotechnology and Environment, University of Bari, Bari, Italy
| | - Frédéric H Login
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Isra K Mahmoud
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | | | - Giovanna Valenti
- Department of Biosciences, Biotechnology and Environment, University of Bari, Bari, Italy
| | | | - Rikke Nørregaard
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Lene N Nejsum
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
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5
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Elekes G, Csapó V, Szarka D, Szalay L, Korsós MM, Tálosi D, Török D, Tóth-Molnár E. The Role of Aquaporin 4 in Lacrimal Gland Ductal Fluid Secretion in Mice. Invest Ophthalmol Vis Sci 2024; 65:30. [PMID: 38771571 DOI: 10.1167/iovs.65.5.30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024] Open
Abstract
Purpose Earlier reports highlighted the predominant presence of aquaporin 4 (AQP4) in the duct cells of rabbit lacrimal glands (LGs). Whereas significant alterations in AQP4 mRNA levels have been observed in experimental dry eye and during pregnancy, the impact of AQP4 in LG ductal fluid production remains unclear. In our recent work, the role of AQP4 in LG ductal fluid secretion was investigated utilizing wild type (WT) and AQP4 knock out (KO) mice. Methods Tear production was assessed in both WT and KO animals. Immunostaining was used to identify AQP4 protein. Duct segments were harvested from LGs of WT and KO mice. Fluid secretion and filtration permeability (Pf) were quantified using video-microscopy. Ductal tear production, elicited by a cell-permeable cAMP analogue (8-bromo cAMP), carbachol, vasoactive intestinal peptide (VIP), and phenylephrine (PHE), were assessed in both WT and KO ducts. Results A higher expression of AQP4 protein was noted in the duct cells from WT mice when compared to acinar cells. Pf did not show notable alterations between WT and AQP4 KO ducts. Carbachol elicited comparable secretory responses in ducts from both WT and KO animals. However, 8-bromo cAMP, VIP, and PHE stimulation resulted in decreased secretion in ducts from AQP4 KO LGs. Conclusions Our findings underscore the functional relevance of AQP4 in the fluid production of mouse LG ducts. AQP4 seems to play different roles in fluid secretions elicited by different secretagogues. Specifically, cAMP-mediated, and adrenergic agonist-related secretions were reduced in AQP4 KO ducts.
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Affiliation(s)
- Gréta Elekes
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
| | - Virág Csapó
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
| | - Dóra Szarka
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
| | - László Szalay
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
| | | | - Dorottya Tálosi
- Albert Szent-Gyorgyi Medical School, University of Szeged, Szeged, Hungary
| | - Dénes Török
- Department of Anatomy, University of Szeged, Szeged, Hungary
| | - Edit Tóth-Molnár
- Department of Ophthalmology, University of Szeged, Szeged, Hungary
- Faculty of Health Sciences and Social Studies, University of Szeged, Szeged, Hungary
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6
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Vacca O, Zarrouki F, Izabelle C, Belmaati Cherkaoui M, Rendon A, Dalkara D, Vaillend C. AAV-Mediated Restoration of Dystrophin-Dp71 in the Brain of Dp71-Null Mice: Molecular, Cellular and Behavioral Outcomes. Cells 2024; 13:718. [PMID: 38667332 PMCID: PMC11049308 DOI: 10.3390/cells13080718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 04/05/2024] [Accepted: 04/12/2024] [Indexed: 04/28/2024] Open
Abstract
A deficiency in the shortest dystrophin-gene product, Dp71, is a pivotal aggravating factor for intellectual disabilities in Duchenne muscular dystrophy (DMD). Recent advances in preclinical research have achieved some success in compensating both muscle and brain dysfunctions associated with DMD, notably using exon skipping strategies. However, this has not been studied for distal mutations in the DMD gene leading to Dp71 loss. In this study, we aimed to restore brain Dp71 expression in the Dp71-null transgenic mouse using an adeno-associated virus (AAV) administrated either by intracardiac injections at P4 (ICP4) or by bilateral intracerebroventricular (ICV) injections in adults. ICP4 delivery of the AAV9-Dp71 vector enabled the expression of 2 to 14% of brain Dp71, while ICV delivery enabled the overexpression of Dp71 in the hippocampus and cortex of adult mice, with anecdotal expression in the cerebellum. The restoration of Dp71 was mostly located in the glial endfeet that surround capillaries, and it was associated with partial localization of Dp71-associated proteins, α1-syntrophin and AQP4 water channels, suggesting proper restoration of a scaffold of proteins involved in blood-brain barrier function and water homeostasis. However, this did not result in significant improvements in behavioral disturbances displayed by Dp71-null mice. The potential and limitations of this AAV-mediated strategy are discussed. This proof-of-concept study identifies key molecular markers to estimate the efficiencies of Dp71 rescue strategies and opens new avenues for enhancing gene therapy targeting cognitive disorders associated with a subgroup of severely affected DMD patients.
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Affiliation(s)
- Ophélie Vacca
- Université Paris-Saclay, CNRS, Institut des Neurosciences Paris-Saclay, 91400 Saclay, France (M.B.C.)
| | - Faouzi Zarrouki
- Université Paris-Saclay, CNRS, Institut des Neurosciences Paris-Saclay, 91400 Saclay, France (M.B.C.)
| | - Charlotte Izabelle
- Université Paris-Saclay, CNRS, Institut des Neurosciences Paris-Saclay, 91400 Saclay, France (M.B.C.)
| | - Mehdi Belmaati Cherkaoui
- Université Paris-Saclay, CNRS, Institut des Neurosciences Paris-Saclay, 91400 Saclay, France (M.B.C.)
| | - Alvaro Rendon
- Department of Therapeutics, Sorbonne University, Institut de la Vision, 75012 Paris, France; (A.R.)
| | - Deniz Dalkara
- Department of Therapeutics, Sorbonne University, Institut de la Vision, 75012 Paris, France; (A.R.)
| | - Cyrille Vaillend
- Université Paris-Saclay, CNRS, Institut des Neurosciences Paris-Saclay, 91400 Saclay, France (M.B.C.)
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7
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Wang X, Ma S, Bai Y, Wu X, Ji F, Jia L. AQP4-DARPin1: A Chimeric Antigen Based on Scaffold Protein DARPin for Efficient Detection of AQP4-IgG in NMOSD. Biochemistry 2024; 63:855-864. [PMID: 38498694 DOI: 10.1021/acs.biochem.3c00688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
AQP4-IgG is an autoantibody associated with neuromyelitis optica spectroscopic disorder (NMOSD), a central nervous system inflammatory disease that requires early diagnosis and treatment. We designed two fusion proteins, AQP4-DARPin1 and AQP4-DARPin2, comprising the complete antigenic epitopes of aquaporin-4 (AQP4) and the constant region of the scaffold protein DARPin. These fusion proteins were expressed and purified from Escherichia coli and coated on microplates to develop an efficient method for detecting AQP4-IgG. Molecular dynamics simulation revealed that the fusion of AQP4 extracellular epitopes with DARPin did not alter the main structure of DARPin. The purified AQP4-DARPins bound recombinant antibody rAb-53 (AQP4-IgG) with affinities of 135 and 285 nM, respectively. Enzyme-linked immunosorbent assay (ELISA) and immunoprecipitation demonstrated that AQP4-DARPin1 specifically recognized AQP4-IgG in the NMOSD patient serum. AQP4-DARPin1 as a coated antigen showed higher ELISA signal and end point dilution ratio than full-length AQP4. Our AQP4-DARPin1-coated AQP4-IgG ELISA had 100% specificity and 90% sensitivity. These results indicate that AQP4-DARPin1, compared to existing detection strategies that use full-length or extracellular loop peptides of AQP4, provides a new and more effective approach to the ELISA detection of NMOSD.
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Affiliation(s)
- Xiaofei Wang
- Liaoning Key Laboratory of Molecular Recognition and Imaging, School of Bioengineering, Dalian University of Technology, Dalian 116023, P. R. China
| | - Shubei Ma
- Department of Neurology, Dalian Municipal Central Hospital, Dalian 116000, P. R. China
| | - Ying Bai
- Department of Neurology, Dalian University Affiliated Xinhua Hospital, Dalian 116021, P. R. China
| | - Xinyang Wu
- Liaoning Key Laboratory of Molecular Recognition and Imaging, School of Bioengineering, Dalian University of Technology, Dalian 116023, P. R. China
| | - Fangling Ji
- Liaoning Key Laboratory of Molecular Recognition and Imaging, School of Bioengineering, Dalian University of Technology, Dalian 116023, P. R. China
| | - Lingyun Jia
- Liaoning Key Laboratory of Molecular Recognition and Imaging, School of Bioengineering, Dalian University of Technology, Dalian 116023, P. R. China
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8
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Nakamura-Maruyama E, Irie K, Narita K, Himi N, Miyamoto O, Nakamura T. Impacts of Age and Gender on Brain Edema in a Mouse Water Intoxication Model. Acta Med Okayama 2024; 78:115-122. [PMID: 38688829 DOI: 10.18926/amo/66914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Brain edema causes abnormal fluid retention and can be fatal in severe cases. Although it develops in various diseases, most treatments for brain edema are classical. We analyzed the impacts of age and gender on the characteristics of a water intoxication model that induces pure brain edema in mice and examined the model's usefulness for research regarding new treatments for brain edema. C57BL/6J mice received an intraperitoneal administration of 10% body weight distilled water, and we calculated the brain water content by measuring the brain-tissue weight immediately after dissection and after drying. We analyzed 8-OHdG and caspase-3 values to investigate the brain damage. We also applied this model in aquaporin 4 knockout (AQP4-) mice and compared these mice with wild-type mice. The changes in water content differed by age and gender, and the 8-OHdG and caspase-3 values differed by age. Suppression of brain edema by AQP4- was also confirmed. These results clarified the differences in the onset of brain edema by age and gender, highlighting the importance of considering the age and gender of model animals. Similar studies using genetically modified mice are also possible. Our findings indicate that this water intoxication model is effective for explorations of new brain edema treatments.
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Affiliation(s)
| | - Keiichiro Irie
- Department of Neurological Surgery, Kagawa University Faculty of Medicine
| | | | - Naoyuki Himi
- Department of Physiology2, Kawasaki Medical School
| | - Osamu Miyamoto
- Department of Physiology2, Kawasaki Medical School
- Departoment of Medical Engineering, Kawasaki University of Medical Welfare Faculty of Health Science and Technology
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Yaghoobi Z, Seyed Bagher Nazeri SS, Asadi A, Derafsh E, Talebi Taheri A, Tamtaji Z, Dadgostar E, Rahmati-Dehkordi F, Aschner M, Mirzaei H, Tamtaji OR, Nabavizadeh F. Non-coding RNAs and Aquaporin 4: Their Role in the Pathogenesis of Neurological Disorders. Neurochem Res 2024; 49:583-596. [PMID: 38114727 DOI: 10.1007/s11064-023-04067-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 11/10/2023] [Accepted: 11/14/2023] [Indexed: 12/21/2023]
Abstract
Neurological disorders are a major group of non-communicable diseases affecting quality of life. Non-Coding RNAs (ncRNAs) have an important role in the etiology of neurological disorders. In studies on the genesis of neurological diseases, aquaporin 4 (AQP4) expression and activity have both been linked to ncRNAs. The upregulation or downregulation of several ncRNAs leads to neurological disorder progression by targeting AQP4. The role of ncRNAs and AQP4 in neurological disorders is discussed in this review.
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Affiliation(s)
- Zahra Yaghoobi
- Electrophysiology Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, I.R. of Iran
- Department of Physiology, School of Medicine, Tehran University of Medical Sciences, Tehran, I.R. of Iran
| | | | - Amir Asadi
- Psychiatry and Behavioral Sciences Research Center, School of Medicine, Addiction Institute, and Department of Psychiatry, Mazandaran University of Medical Sciences, Sari, Iran
| | - Ehsan Derafsh
- Windsor University School of Medicine, Cayon, St Kitts and Nevis
| | - Abdolkarim Talebi Taheri
- Student Research Committee, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Zeinab Tamtaji
- Student Research Committee, Kashan University of Medical Sciences, Kashan, I.R. of Iran
| | - Ehsan Dadgostar
- Behavioral Sciences Research Center, Isfahan University of Medical Sciences, Isfahan, I.R. of Iran
- Student Research Committee, Isfahan University of Medical Sciences, Isfahan, I.R. of Iran
| | - Fatemeh Rahmati-Dehkordi
- Electrophysiology Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, I.R. of Iran
- Department of Physiology, School of Medicine, Tehran University of Medical Sciences, Tehran, I.R. of Iran
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Hamed Mirzaei
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Kashan University of Medical Sciences, Kashan, I.R. of Iran.
| | - Omid Reza Tamtaji
- Electrophysiology Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, I.R. of Iran.
- Department of Physiology, School of Medicine, Tehran University of Medical Sciences, Tehran, I.R. of Iran.
| | - Fatemeh Nabavizadeh
- Electrophysiology Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, I.R. of Iran.
- Department of Physiology, School of Medicine, Tehran University of Medical Sciences, Tehran, I.R. of Iran.
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Afzali AM, Nirschl L, Sie C, Pfaller M, Ulianov O, Hassler T, Federle C, Petrozziello E, Kalluri SR, Chen HH, Tyystjärvi S, Muschaweckh A, Lammens K, Delbridge C, Büttner A, Steiger K, Seyhan G, Ottersen OP, Öllinger R, Rad R, Jarosch S, Straub A, Mühlbauer A, Grassmann S, Hemmer B, Böttcher JP, Wagner I, Kreutzfeldt M, Merkler D, Pardàs IB, Schmidt Supprian M, Buchholz VR, Heink S, Busch DH, Klein L, Korn T. B cells orchestrate tolerance to the neuromyelitis optica autoantigen AQP4. Nature 2024; 627:407-415. [PMID: 38383779 PMCID: PMC10937377 DOI: 10.1038/s41586-024-07079-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Accepted: 01/16/2024] [Indexed: 02/23/2024]
Abstract
Neuromyelitis optica is a paradigmatic autoimmune disease of the central nervous system, in which the water-channel protein AQP4 is the target antigen1. The immunopathology in neuromyelitis optica is largely driven by autoantibodies to AQP42. However, the T cell response that is required for the generation of these anti-AQP4 antibodies is not well understood. Here we show that B cells endogenously express AQP4 in response to activation with anti-CD40 and IL-21 and are able to present their endogenous AQP4 to T cells with an AQP4-specific T cell receptor (TCR). A population of thymic B cells emulates a CD40-stimulated B cell transcriptome, including AQP4 (in mice and humans), and efficiently purges the thymic TCR repertoire of AQP4-reactive clones. Genetic ablation of Aqp4 in B cells rescues AQP4-specific TCRs despite sufficient expression of AQP4 in medullary thymic epithelial cells, and B-cell-conditional AQP4-deficient mice are fully competent to raise AQP4-specific antibodies in productive germinal-centre responses. Thus, the negative selection of AQP4-specific thymocytes is dependent on the expression and presentation of AQP4 by thymic B cells. As AQP4 is expressed in B cells in a CD40-dependent (but not AIRE-dependent) manner, we propose that thymic B cells might tolerize against a group of germinal-centre-associated antigens, including disease-relevant autoantigens such as AQP4.
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Affiliation(s)
- Ali Maisam Afzali
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany
- Department of Neurology, Technical University of Munich School of Medicine and Health, Munich, Germany
- Munich Cluster for Systems Neurology, Munich, Germany
| | - Lucy Nirschl
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Christopher Sie
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Monika Pfaller
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Oleksii Ulianov
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Tobias Hassler
- Biomedical Center (BMC), Institute for Immunology, Faculty of Medicine, Ludwig-Maximilians-University Munich, Planegg-Martinsried, Germany
| | - Christine Federle
- Biomedical Center (BMC), Institute for Immunology, Faculty of Medicine, Ludwig-Maximilians-University Munich, Planegg-Martinsried, Germany
| | - Elisabetta Petrozziello
- Biomedical Center (BMC), Institute for Immunology, Faculty of Medicine, Ludwig-Maximilians-University Munich, Planegg-Martinsried, Germany
| | - Sudhakar Reddy Kalluri
- Department of Neurology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Hsin Hsiang Chen
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Sofia Tyystjärvi
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Andreas Muschaweckh
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Katja Lammens
- Department of Biochemistry at the Gene Center, Ludwig-Maximilians-University, Munich, Germany
| | - Claire Delbridge
- Institute of Pathology, Technical University of Munich School of Medicine and Health, Munich, Germany
- Department of Neuropathology, Institute of Pathology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Andreas Büttner
- Institute of Forensic Medicine, Rostock University Medical Center, Rostock, Germany
| | - Katja Steiger
- Institute of Pathology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Gönül Seyhan
- Institute for Experimental Hematology, TranslaTUM Cancer Center, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Ole Petter Ottersen
- Division of Anatomy, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Rupert Öllinger
- Institute of Molecular Oncology and Functional Genomics, TranslaTUM Cancer Center, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Roland Rad
- Institute of Molecular Oncology and Functional Genomics, TranslaTUM Cancer Center, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Sebastian Jarosch
- Institute for Medical Microbiology, Immunology and Hygiene, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Adrian Straub
- Institute for Medical Microbiology, Immunology and Hygiene, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Anton Mühlbauer
- Institute for Medical Microbiology, Immunology and Hygiene, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Simon Grassmann
- Immunology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Bernhard Hemmer
- Department of Neurology, Technical University of Munich School of Medicine and Health, Munich, Germany
- Munich Cluster for Systems Neurology, Munich, Germany
| | - Jan P Böttcher
- Institute of Molecular Immunology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Ingrid Wagner
- Department of Pathology and Immunology, Division of Clinical Pathology, Geneva Faculty of Medicine, Centre Médical Universitaire, Geneva, Switzerland
| | - Mario Kreutzfeldt
- Department of Pathology and Immunology, Division of Clinical Pathology, Geneva Faculty of Medicine, Centre Médical Universitaire, Geneva, Switzerland
| | - Doron Merkler
- Department of Pathology and Immunology, Division of Clinical Pathology, Geneva Faculty of Medicine, Centre Médical Universitaire, Geneva, Switzerland
| | | | - Marc Schmidt Supprian
- Institute for Experimental Hematology, TranslaTUM Cancer Center, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Veit R Buchholz
- Institute for Medical Microbiology, Immunology and Hygiene, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Sylvia Heink
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany
| | - Dirk H Busch
- Institute for Medical Microbiology, Immunology and Hygiene, Technical University of Munich School of Medicine and Health, Munich, Germany
- German Center for Infection Research (DZIF), Partner Site Munich, Munich, Germany
| | - Ludger Klein
- Biomedical Center (BMC), Institute for Immunology, Faculty of Medicine, Ludwig-Maximilians-University Munich, Planegg-Martinsried, Germany
| | - Thomas Korn
- Institute for Experimental Neuroimmunology, Technical University of Munich School of Medicine and Health, Munich, Germany.
- Department of Neurology, Technical University of Munich School of Medicine and Health, Munich, Germany.
- Munich Cluster for Systems Neurology, Munich, Germany.
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11
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Wang X, Ji F, Jia L. Chimeric AQP4-based immunosorbent for highly-specific removal of AQP4-IgG from blood. J Chromatogr A 2024; 1717:464701. [PMID: 38310704 DOI: 10.1016/j.chroma.2024.464701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 01/26/2024] [Accepted: 01/30/2024] [Indexed: 02/06/2024]
Abstract
Anti-aquaporin-4 autoantibodies (AQP4-IgG) are implicated in the pathogenesis of neuromyelitis optica spectrum disorders (NMOSD), and their removal from the blood circulation is considered to be an effective method for acute treatment. An ideal extracorporeal AQP4-IgG removal system should have high specificity, which means that it can selectively remove AQP4-IgG without affecting normal immunoglobulins. However, the conventional tryptophan immobilized column lacks sufficient specificity and cannot achieve this goal. In this study, we successfully prepared a fusion protein chimeric AQP4, which consists of the complete antigenic epitopes of human AQP4 and the constant region of scaffold protein DARPin. Chimeric AQP4 was expressed and purified from Escherichia coli, and then immobilized on agarose gel as a ligand for selective capture of AQP4-IgG immunosorbent. The prepared immunosorbent had a theoretical maximum adsorption capacity of 20.48 mg/g gel estimated by Langmuir isotherm. In vitro plasma perfusion tests demonstrated that the chimeric AQP4 coupled adsorbent had remarkable adsorption performance, and could eliminate more than 85 % of AQP4-IgG under the gel-to-plasma ratio of 1:50. Moreover, it exhibited high specificity because other human plasma proteins were not adsorbed in the dynamic adsorption experiment. These results suggest that the chimeric AQP4 coupled immunosorbent can provide a new approach for specific immunoadsorption (IA) treatment of NMOSD.
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Affiliation(s)
- Xiaofei Wang
- MOE Key Laboratory of Bio-Intelligent Manufacturing, School of Bioengineering, Dalian University of Technology, Dalian, Liaoning 116023, China; Liaoning Key Laboratory of Molecular Recognition and Imaging, School of Bioengineering, Dalian University of Technology, Dalian, Liaoning 116023, China
| | - Fangling Ji
- MOE Key Laboratory of Bio-Intelligent Manufacturing, School of Bioengineering, Dalian University of Technology, Dalian, Liaoning 116023, China; Liaoning Key Laboratory of Molecular Recognition and Imaging, School of Bioengineering, Dalian University of Technology, Dalian, Liaoning 116023, China.
| | - Lingyun Jia
- MOE Key Laboratory of Bio-Intelligent Manufacturing, School of Bioengineering, Dalian University of Technology, Dalian, Liaoning 116023, China; Liaoning Key Laboratory of Molecular Recognition and Imaging, School of Bioengineering, Dalian University of Technology, Dalian, Liaoning 116023, China.
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12
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Markou A, Kitchen P, Aldabbagh A, Repici M, Salman MM, Bill RM, Balklava Z. Mechanisms of aquaporin-4 vesicular trafficking in mammalian cells. J Neurochem 2024; 168:100-114. [PMID: 38102893 PMCID: PMC10953025 DOI: 10.1111/jnc.16029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 11/24/2023] [Accepted: 12/02/2023] [Indexed: 12/17/2023]
Abstract
The aquaporin-4 (AQP4) water channel is abundantly expressed in the glial cells of the central nervous system and facilitates brain swelling following diverse insults, such as traumatic injury or stroke. Lack of specific and therapeutic AQP4 inhibitors highlights the need to explore alternative routes to control the water permeability of glial cell membranes. The cell surface abundance of AQP4 in mammalian cells fluctuates rapidly in response to changes in oxygen levels and tonicity, suggesting a role for vesicular trafficking in its translocation to and from the cell surface. However, the molecular mechanisms of AQP4 trafficking are not fully elucidated. In this work, early and recycling endosomes were investigated as likely candidates of rapid AQP4 translocation together with changes in cytoskeletal dynamics. In transiently transfected HEK293 cells a significant amount of AQP-eGFP colocalised with mCherry-Rab5-positive early endosomes and mCherry-Rab11-positive recycling endosomes. When exposed to hypotonic conditions, AQP4-eGFP rapidly translocated from intracellular vesicles to the cell surface. Co-expression of dominant negative forms of the mCherry-Rab5 and -Rab11 with AQP4-eGFP prevented hypotonicity-induced AQP4-eGFP trafficking and led to concentration at the cell surface or intracellular vesicles respectively. Use of endocytosis inhibiting drugs indicated that AQP4 internalisation was dynamin-dependent. Cytoskeleton dynamics-modifying drugs also affected AQP4 translocation to and from the cell surface. AQP4 trafficking mechanisms were validated in primary human astrocytes, which express high levels of endogenous AQP4. The results highlight the role of early and recycling endosomes and cytoskeletal dynamics in AQP4 translocation in response to hypotonic and hypoxic stress and suggest continuous cycling of AQP4 between intracellular vesicles and the cell surface under physiological conditions.
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Affiliation(s)
- Andrea Markou
- College of Health and Life SciencesAston UniversityBirminghamUK
- School of Biosciences, Faculty of Health and Medical SciencesUniversity of SurreyGuildfordUK
| | - Philip Kitchen
- College of Health and Life SciencesAston UniversityBirminghamUK
| | - Ahmed Aldabbagh
- College of Health and Life SciencesAston UniversityBirminghamUK
| | | | - Mootaz M. Salman
- Department of Physiology, Anatomy and GeneticsUniversity of OxfordOxfordUK
- Kavli Institute for NanoScience DiscoveryUniversity of OxfordOxfordUK
| | - Roslyn M. Bill
- College of Health and Life SciencesAston UniversityBirminghamUK
| | - Zita Balklava
- College of Health and Life SciencesAston UniversityBirminghamUK
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13
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Yamamoto A, Shimizu H, Takiguchi K, Shoda K, Shiraishi K, Furuya S, Akaike H, Kawaguchi Y, Amemiya H, Kawaida H, Mochizuki K, Kondo T, Ichikawa D. The Expression and Role of Aquaporin 4 in Colon Cancer. Anticancer Res 2024; 44:567-573. [PMID: 38307548 DOI: 10.21873/anticanres.16845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 12/25/2023] [Accepted: 12/26/2023] [Indexed: 02/04/2024]
Abstract
BACKGROUND/AIM Aquaporins (AQPs) were initially discovered as water channel proteins that facilitate transcellular water movements. Recent studies have shown that AQPs are expressed and play an oncogenic role in various cancers. However, the expression and role of Aquaporin 4 (AQP4) in colon cancer have not been investigated. This study aimed to examine the clinical and pathophysiologic significance of AQP4 in colon cancer. PATIENTS AND METHODS Immunohistochemistry (IHC) of AQP4 for 145 primary tumor samples obtained from patients with stage II or III colon cancer was performed, and the relationship between AQP4 expression and patients' prognoses was analyzed. Knockdown experiments with AQP4 small interfering RNA using human colon cancer cells were conducted to analyze the effects on cell invasiveness. RESULTS IHC revealed that AQP4 was scarcely expressed in the noncancerous colonic mucosa. Of the 145 patients who enrolled in this study, 109 (75.2%) and 36 (24.8%) patients were classified as negative and positive for AQP4 expression, respectively. A high level of AQP4 expression is significantly associated with deeper tumors with lymph node metastasis and venous invasion. A 5-year progression-free survival rate of AQP4-positive patients was significantly worse than that of AQP-4 negative patients (70.7% vs. 87.0%, p=0.049). Furthermore, AQP4 knockdown significantly inhibited cell migration and invasion in HCT116 cells. CONCLUSION AQP4 may be a novel biomarker and therapeutic target for colon cancer.
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Affiliation(s)
- Atsushi Yamamoto
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Hiroki Shimizu
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan;
| | - Koichi Takiguchi
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Katsutoshi Shoda
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Kensuke Shiraishi
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Shinji Furuya
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Hidenori Akaike
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Yoshihiko Kawaguchi
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Hidetake Amemiya
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Hiromichi Kawaida
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Kunio Mochizuki
- Department of Pathology, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Tetsuo Kondo
- Department of Pathology, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Daisuke Ichikawa
- First Department of Surgery, Faculty of Medicine, University of Yamanashi, Yamanashi, Japan
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14
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Lapshina KV, Ekimova IV. Aquaporin-4 and Parkinson's Disease. Int J Mol Sci 2024; 25:1672. [PMID: 38338949 PMCID: PMC10855351 DOI: 10.3390/ijms25031672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/15/2024] [Accepted: 01/26/2024] [Indexed: 02/12/2024] Open
Abstract
The water-selective channel aquaporin-4 (AQP4) is implicated in water homeostasis and the functioning of the glymphatic system, which eliminates various metabolites from the brain tissue, including amyloidogenic proteins. Misfolding of the α-synuclein protein and its post-translational modifications play a crucial role in the development of Parkinson's disease (PD) and other synucleopathies, leading to the formation of cytotoxic oligomers and aggregates that cause neurodegeneration. Human and animal studies have shown an interconnection between AQP4 dysfunction and α-synuclein accumulation; however, the specific role of AQP4 in these mechanisms remains unclear. This review summarizes the current knowledge on the role of AQP4 dysfunction in the progression of α-synuclein pathology, considering the possible effects of AQP4 dysregulation on brain molecular mechanisms that can impact α-synuclein modification, accumulation and aggregation. It also highlights future directions that can help study the role of AQP4 in the functioning of the protective mechanisms of the brain during the development of PD and other neurodegenerative diseases.
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Affiliation(s)
- Ksenia V. Lapshina
- Laboratory of Comparative Thermophysiology, Sechenov Institute of Evolutionary Physiology and Biochemistry of RAS, 194223 Saint Petersburg, Russia;
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15
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Liu J, Miao M, Wei F. Angelicin Alleviates Maternal Isoflurane Exposure-Induced Offspring Cognitive Defects Through the Carbonic Anhydrase 4/Aquaporin-4 Pathway. Mol Biotechnol 2024; 66:34-43. [PMID: 36997697 DOI: 10.1007/s12033-023-00723-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 03/13/2023] [Indexed: 04/03/2023]
Abstract
An increasing number of studies reveal the deleterious effects of isoflurane (Iso) exposure during pregnancy on offspring cognition. However, no effective therapeutic strategy for Iso-induced deleterious effects has been well developed. Angelicin exerts an anti-inflammatory effect on neurons and glial cells. This study investigated the roles and mechanism of action of angelicin in Iso-induced neurotoxicity in vitro and in vivo. After exposing C57BL/6 J mice on embryonic day 15 (E15) to Iso for 3 and 6 h, respectively, neonatal mice on embryonic day 18 (E18) displayed obvious anesthetic neurotoxicity, which was revealed by the elevation of cerebral inflammatory factors and blood-brain barrier (BBB) permeability and cognitive dysfunction in mice. Angelicin treatment could not only significantly reduce the Iso-induced embryonic inflammation and BBB disruption but also improve the cognitive dysfunction of offspring mice. Iso exposure resulted in an increase of carbonic anhydrase (CA) 4 and aquaporin-4 (AQP4) expression at both mRNA and protein levels in vascular endothelial cells and mouse brain tissue collected from neonatal mice on E18. Remarkably, the Iso-induced upregulation of CA4 and AQP4 expression could be partially reversed by angelicin treatment. Moreover, GSK1016790A, an AQP4 agonist, was used to confirm the role of AQP4 in the protective effect of angelicin. Results showed that GSK1016790A abolished the therapeutic effect of angelicin on Iso-induced inflammation and BBB disruption in the embryonic brain and on the cognitive function of offspring mice. In conclusion, angelicin may serve as a potential therapeutic for Iso-induced neurotoxicity in neonatal mice by regulating the CA4/AQP4 pathway.
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Affiliation(s)
- Jingying Liu
- Department of Obstetrical, Yantaishan Hospital, Yantai, 264000, Shandong, China
| | - Meijuan Miao
- Department of Anesthesiology, Feicheng People's Hospital, Feicheng, 271600, Shandong, China
| | - Fujiang Wei
- Department of Anesthesiology, Yantaishan Hospital, No. 91 Jiefang Road, Zhifu District, Yantai, 264000, Shandong, China.
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16
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Nowicka D. Glymphatic system and aquaporin‑4 in epilepsy. Acta Neurobiol Exp (Wars) 2023; 83:447-458. [PMID: 38224279 DOI: 10.55782/ane-2023-2498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Indexed: 01/16/2024]
Abstract
Over the past decade glymphatic concept has gained more and more interest. Despite some lacking data regarding structural and functional aspects, glymphatic system is widely considered the main mechanism of water and solutes transport in brain parenchyma, as well as waste clearance from the brain. Glymphatic system modulates the extracellular space volume and is involved in spatial K+ buffering (via influencing Kir4.1 channel functioning), two factors crucial for neuronal excitability and seizure susceptibility, and is itself strongly stimulated during sleep. This review summarizes information regarding the potential role of the glymphatic system in the development and progression of epilepsy, especially the role of the glial water channel aquaporin‑4 in modulation of brain excitability and in epilepsy. Data from animal models and human studies are presented.
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Affiliation(s)
- Dorota Nowicka
- Laboratory of Epileptogenesis, Nencki Institute of Experimental Biology PAS, Warsaw, Poland.
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17
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Cossu D, Tomizawa Y, Sechi LA, Hattori N. Epstein-Barr Virus and Human Endogenous Retrovirus in Japanese Patients with Autoimmune Demyelinating Disorders. Int J Mol Sci 2023; 24:17151. [PMID: 38138980 PMCID: PMC10743056 DOI: 10.3390/ijms242417151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/01/2023] [Accepted: 12/04/2023] [Indexed: 12/24/2023] Open
Abstract
Multiple sclerosis (MS), neuromyelitis optica spectrum disorder (NMOSD), and myelin oligodendrocytes glycoprotein-antibody disease (MOGAD) are distinct autoimmune demyelinating disorders characterized by varying clinical and pathological characteristics. While the precise origins of these diseases remain elusive, a combination of genetic and environmental factors, including viral elements, have been suggested as potential contributors to their development. Our goal was to assess the occurrence of antibodies against pathogenic peptides associated with Epstein-Barr virus (EBV) and the human endogenous retrovirus-W (HERV-W) in serum samples obtained from Japanese individuals diagnosed with MS, NMOSD, and MOGAD and to make comparisons with a group of healthy controls (HCs). We conducted a retrospective analysis involving 114 Japanese participants, comprising individuals with MS (34), NMOSD (20), MOGAD (20), and HCs (40). These individuals were tested using a peptide-based enzyme-linked immunosorbent assay. A marked increase in antibody response against EBV nuclear antigen 1 (EBNA1)386-405 was observed in the serum of MS and MOGAD patients, as compared to HCs. Notably, we observed a correlation between antibodies against EBNA1386-405 and HERV-W486-504 peptides in a subset of the antibody-positive MS patients. These findings emphasize the involvement of EBV in the pathogenesis of MS and potentially MOGAD, suggesting its role in the reactivation of HERV-W.
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Affiliation(s)
- Davide Cossu
- Department of Neurology, Juntendo University, Tokyo 1138431, Japan; (Y.T.); (N.H.)
- Biomedical Research Core Facilities, Juntendo University, Tokyo 1138431, Japan
- Department of Biomedical Sciences, Sassari University, 07100 Sassari, Italy;
| | - Yuji Tomizawa
- Department of Neurology, Juntendo University, Tokyo 1138431, Japan; (Y.T.); (N.H.)
| | - Leonardo Antonio Sechi
- Department of Biomedical Sciences, Sassari University, 07100 Sassari, Italy;
- Struttura Complessa di Microbiologia e Virologia, Azienda Ospedaliera Universitaria, 07100 Sassari, Italy
| | - Nobutaka Hattori
- Department of Neurology, Juntendo University, Tokyo 1138431, Japan; (Y.T.); (N.H.)
- Neurodegenerative Disorders Collaborative Laboratory, RIKEN Center for Brain Science, Saitama 3510918, Japan
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18
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Kim HJ, Aktas O, Patterson KR, Korff S, Kunchok A, Bennett JL, Weinshenker BG, Paul F, Hartung H, Cimbora D, Smith MA, Mittereder N, Rees WA, She D, Cree BAC. Inebilizumab reduces neuromyelitis optica spectrum disorder risk independent of FCGR3A polymorphism. Ann Clin Transl Neurol 2023; 10:2413-2420. [PMID: 37804003 PMCID: PMC10723240 DOI: 10.1002/acn3.51911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 08/24/2023] [Accepted: 09/13/2023] [Indexed: 10/08/2023] Open
Abstract
Inebilizumab, a humanized, glycoengineered, IgG1 monoclonal antibody that depletes CD19+ B-cells, is approved to treat aquaporin 4 (AQP4) IgG-seropositive neuromyelitis optica spectrum disorder (NMOSD). Inebilizumab is afucosylated and engineered for enhanced affinity to Fc receptor III-A (FCGR3A) receptors on natural killer cells to maximize antibody-dependent cellular cytotoxicity. Previously, the F allele polymorphism at amino acid 158 of the FCGR3A gene (F158) was shown to decrease IgG-binding affinity and reduce rituximab (anti-CD20) efficacy for NMOSD attack prevention. In contrast, our current findings from inebilizumab-treated NMOSD patients indicate similar clinical outcomes between those with F158 and V158 allele genotypes.
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Affiliation(s)
- Ho Jin Kim
- Department of NeurologyResearch Institute and Hospital of National Cancer CenterGoyangSouth Korea
| | - Orhan Aktas
- Medical FacultyHeinrich Heine University DüsseldorfDüsseldorfGermany
| | | | | | - Amy Kunchok
- Department of NeurologyMellen Center for Multiple Sclerosis, Cleveland ClinicOhioClevelandUSA
| | - Jeffrey L. Bennett
- Department of Neurology, Programs in Neuroscience and ImmunologyUniversity of Colorado School of Medicine, Anschutz Medical CampusColoradoAuroraUSA
| | | | - Friedemann Paul
- Experimental and Clinical Research Center, Max Delbrück Center for Molecular Medicine and CharitéUniversitätsmedizin Berlin, Corporate Member of Freie Universitat Berlin and Humboldt‐Universitat zu BerlinBerlinGermany
| | - Hans‐Peter Hartung
- Medical FacultyHeinrich Heine University DüsseldorfDüsseldorfGermany
- Brain and Mind CentreUniversity of SydneyNew South WalesSydneyAustralia
- Department of NeurologyMedical University ViennaViennaAustria
- Department of NeurologyPalacky University in OlomoucOlomoucCzech Republic
| | | | | | | | | | - Dewei She
- Horizon TherapeuticsIllinoisDeerfieldUSA
| | - Bruce A. C. Cree
- Department of Neurology, UCSF Weill Institute for NeurosciencesUniversity of California San FranciscoCaliforniaSan FranciscoUSA
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19
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Wang L, Zhou L, ZhangBao J, Huang W, Tan H, Fan Y, Lu C, Yu J, Wang M, Lu J, Zhao C, Zhang T, Quan C. Causal associations between prodromal infection and neuromyelitis optica spectrum disorder: A Mendelian randomization study. Eur J Neurol 2023; 30:3819-3827. [PMID: 37540821 DOI: 10.1111/ene.16014] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 07/16/2023] [Accepted: 07/27/2023] [Indexed: 08/06/2023]
Abstract
BACKGROUND AND PURPOSE Prodromal infections are associated with neuromyelitis optica spectrum disorder (NMOSD), but it remains unclear which type of infection has a causal association with NMOSD. We aimed to explore the causal associations between four herpesvirus infections (chickenpox, cold sores, mononucleosis and shingles) and NMOSD, as well as between other types of infections and NMOSD. METHODS For data on infections, we used the genome-wide association study (GWAS) summary statistics from the 23andMe cohort. For outcomes, we used the GWAS data of participants of European ancestry, including 215 NMOSD patients (132 anti-aquaporin-4 antibody [AQP4-ab]-positive patients and 83 AQP4-ab-negative patients) and 1244 normal controls. Single-nucleotide polymorphism (SNP) identification and two-sample Mendelian randomization (MR) analyses were then performed. RESULTS In the 23andMe cohort, we identified one SNP for chickenpox (rs9266089 in HLA-B gene), one SNP for cold scores (rs885950 in the POU5F1 gene), one SNP for mononucleosis (rs2596465 in the HCP5 gene), and three SNPs for shingles (rs2523591 in the HLA-B gene; rs7047299 in the IFNA21 gene; rs9260809 in the MICD gene). The association between cold sores and AQP4-ab-positive NMOSD reached statistical significance (odds ratio [OR] 745.318; 95% confidence interval [CI] 22.176, 25,049.53 [p < 0.001, Q < 0.001]). The association between shingles and AQP4-ab-positive NMOSD was also statistically significant (OR 21.073; 95% CI 4.271, 103.974 [p < 0.001, Q < 0.001]). No significant association was observed between other infections and AQP4-ab-positive or AQP4-ab-negative NMOSD. CONCLUSION These findings suggest there are positive associations between cold sores and shingles and AQP4-ab-positive NMOSD, indicating there may be causal links between herpes simplex virus and varicella-zoster virus infection and AQP4-ab-positive NMOSD.
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Affiliation(s)
- Liang Wang
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Lei Zhou
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Jingzi ZhangBao
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Wenjuan Huang
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Hongmei Tan
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Yuxin Fan
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Chuanzhen Lu
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Jian Yu
- Department of Ophthalmology and Vision Science, Eye and ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Min Wang
- Department of Ophthalmology and Vision Science, Eye and ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Jiahong Lu
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Chongbo Zhao
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
| | - Tiansong Zhang
- Department of Chinese Traditional Medicine, Jing'an District Hospital of Traditional Chinese Medicine, Shanghai, China
| | - Chao Quan
- Department of Neurology and Rare Disease Center, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- National Center for Neurological Disorders, Shanghai, China
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20
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Cha H, Choi JH, Jeon H, Kim JH, Kim M, Kim SJ, Park W, Lim JS, Lee E, Ahn JS, Kim JH, Hong SH, Park JE, Jung JH, Yoo HJ, Lee S. Aquaporin-4 Deficiency is Associated with Cognitive Impairment and Alterations in astrocyte-neuron Lactate Shuttle. Mol Neurobiol 2023; 60:6212-6226. [PMID: 37436602 DOI: 10.1007/s12035-023-03475-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 07/02/2023] [Indexed: 07/13/2023]
Abstract
Cognitive impairment refers to notable declines in cognitive abilities including memory, language, and emotional stability leading to the inability to accomplish essential activities of daily living. Astrocytes play an important role in cognitive function, and homeostasis of the astrocyte-neuron lactate shuttle (ANLS) system is essential for maintaining cognitive functions. Aquaporin-4 (AQP-4) is a water channel expressed in astrocytes and has been shown to be associated with various brain disorders, but the direct relationship between learning, memory, and AQP-4 is unclear. We examined the relationship between AQP-4 and cognitive functions related to learning and memory. Mice with genetic deletion of AQP-4 showed significant behavioral and emotional changes including hyperactivity and instability, and impaired cognitive functions such as spatial learning and memory retention. 18 F-FDG PET imaging showed significant metabolic changes in the brains of AQP-4 knockout mice such as reductions in glucose absorption. Such metabolic changes in the brain seemed to be the direct results of changes in the expression of metabolite transporters, as the mRNA levels of multiple glucose and lactate transporters in astrocytes and neurons were significantly decreased in the cortex and hippocampus of AQP-4 knockout mice. Indeed, AQP-4 knockout mice showed significantly higher accumulation of both glucose and lactate in their brains compared with wild-type mice. Our results show that the deficiency of AQP-4 can cause problems in the metabolic function of astrocytes and lead to cognitive impairment, and that the deficiency of AQP4 in astrocyte endfeet can cause abnormalities in the ANLS system.
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Affiliation(s)
- Hyeuk Cha
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
- Department of Medical Science, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Jun Ho Choi
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
| | - Hanwool Jeon
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
- Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Jae Hyun Kim
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
| | - Moinay Kim
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
| | - Su Jung Kim
- Convergence Medicine Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
| | - Wonhyoung Park
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
- University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Joon Seo Lim
- Clinical Research Center, Asan Medical Center, Asan Institute for Life Sciences, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Eunyeup Lee
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
- Department of Medical Science, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Jae Sung Ahn
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
- University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Jeong Hoon Kim
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
- University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Seok Ho Hong
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea
- University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Ji Eun Park
- University of Ulsan College of Medicine, Seoul, Republic of Korea
- Department of Neuroradiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Jin Hwa Jung
- Convergence Medicine Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
| | - Hyun Ju Yoo
- University of Ulsan College of Medicine, Seoul, Republic of Korea
- Convergence Medicine Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Republic of Korea
| | - Seungjoo Lee
- Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Republic of Korea.
- Department of Medical Science, Asan Medical Center, Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, Seoul, Republic of Korea.
- University of Ulsan College of Medicine, Seoul, Republic of Korea.
- Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Seoul, Republic of Korea.
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21
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Carrero L, Antequera D, Alcalde I, Megias D, Ordoñez-Gutierrez L, Gutierrez C, Merayo-Lloves J, Wandosell F, Municio C, Carro E. Altered Clock Gene Expression in Female APP/PS1 Mice and Aquaporin-Dependent Amyloid Accumulation in the Retina. Int J Mol Sci 2023; 24:15679. [PMID: 37958666 PMCID: PMC10648501 DOI: 10.3390/ijms242115679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 10/18/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023] Open
Abstract
Alzheimer's disease (AD), the most prevalent form of dementia, is a neurodegenerative disorder characterized by different pathological symptomatology, including disrupted circadian rhythm. The regulation of circadian rhythm depends on the light information that is projected from the retina to the suprachiasmatic nucleus in the hypothalamus. Studies of AD patients and AD transgenic mice have revealed AD retinal pathology, including amyloid-β (Aβ) accumulation that can directly interfere with the regulation of the circadian cycle. Although the cause of AD pathology is poorly understood, one of the main risk factors for AD is female gender. Here, we found that female APP/PS1 mice at 6- and 12-months old display severe circadian rhythm disturbances and retinal pathological hallmarks, including Aβ deposits in retinal layers. Since brain Aβ transport is facilitated by aquaporin (AQP)4, the expression of AQPs were also explored in APP/PS1 retina to investigate a potential correlation between retinal Aβ deposits and AQPs expression. Important reductions in AQP1, AQP4, and AQP5 were detected in the retinal tissue of these transgenic mice, mainly at 6-months of age. Taken together, our findings suggest that abnormal transport of Aβ, mediated by impaired AQPs expression, contributes to the retinal degeneration in the early stages of AD.
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Affiliation(s)
- Laura Carrero
- Neurobiology of Alzheimer’s Disease Unit, Functional Unit for Research into Chronic Diseases, Instituto de Salud Carlos III, Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED), ISCIII, 28029 Madrid, Spain; (L.C.); (D.A.); (C.G.)
- PhD Program in Neuroscience, Autonoma de Madrid University, 28049 Madrid, Spain
| | - Desireé Antequera
- Neurobiology of Alzheimer’s Disease Unit, Functional Unit for Research into Chronic Diseases, Instituto de Salud Carlos III, Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED), ISCIII, 28029 Madrid, Spain; (L.C.); (D.A.); (C.G.)
| | - Ignacio Alcalde
- Instituto Universitario Fernández-Vega, Universidad de Oviedo, Fundación de Investigación Oftalmológica, 28012 Oviedo, Spain; (I.A.); (J.M.-L.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Spain
| | - Diego Megias
- Advanced Optical Microscopy Unit, Unidades Centrales Científico-Técnicas, Instituto de Salud Carlos III, 28222 Madrid, Spain;
| | - Lara Ordoñez-Gutierrez
- Centro de Biología Molecular “Severo Ochoa” (CSIC-UAM), Universidad Autónoma de Madrid, Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED), ISCIII, 28029 Madrid, Spain; (L.O.-G.); (F.W.)
| | - Cristina Gutierrez
- Neurobiology of Alzheimer’s Disease Unit, Functional Unit for Research into Chronic Diseases, Instituto de Salud Carlos III, Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED), ISCIII, 28029 Madrid, Spain; (L.C.); (D.A.); (C.G.)
| | - Jesús Merayo-Lloves
- Instituto Universitario Fernández-Vega, Universidad de Oviedo, Fundación de Investigación Oftalmológica, 28012 Oviedo, Spain; (I.A.); (J.M.-L.)
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Spain
| | - Francisco Wandosell
- Centro de Biología Molecular “Severo Ochoa” (CSIC-UAM), Universidad Autónoma de Madrid, Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED), ISCIII, 28029 Madrid, Spain; (L.O.-G.); (F.W.)
| | - Cristina Municio
- Neurobiology of Alzheimer’s Disease Unit, Functional Unit for Research into Chronic Diseases, Instituto de Salud Carlos III, Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED), ISCIII, 28029 Madrid, Spain; (L.C.); (D.A.); (C.G.)
| | - Eva Carro
- Neurobiology of Alzheimer’s Disease Unit, Functional Unit for Research into Chronic Diseases, Instituto de Salud Carlos III, Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED), ISCIII, 28029 Madrid, Spain; (L.C.); (D.A.); (C.G.)
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22
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Contreras-Zárate MJ, Alvarez-Eraso KLF, Jaramillo-Gómez JA, Littrell Z, Tsuji N, Ormond DR, Karam SD, Kabos P, Cittelly DM. Short-term topiramate treatment prevents radiation-induced cytotoxic edema in preclinical models of breast-cancer brain metastasis. Neuro Oncol 2023; 25:1802-1814. [PMID: 37053041 PMCID: PMC10547511 DOI: 10.1093/neuonc/noad070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Indexed: 04/14/2023] Open
Abstract
BACKGROUND Brain edema is a common complication of brain metastases (BM) and associated treatment. The extent to which cytotoxic edema, the first step in the sequence that leads to ionic edema, vasogenic edema, and brain swelling, contributes to radiation-induced brain edema during BM remains unknown. This study aimed to determine whether radiation-associated treatment of BM induces cytotoxic edema and the consequences of blocking the edema in preclinical models of breast-cancer brain metastases (BCBM). METHODS Using in vitro and in vivo models, we measured astrocytic swelling, trans-electric resistance (TEER), and aquaporin 4 (AQP4) expression following radiation. Genetic and pharmacological inhibition of AQP4 in astrocytes and cancer cells was used to assess the role of AQP4 in astrocytic swelling and brain water intake. An anti-epileptic drug that blocks AQP4 function (topiramate) was used to prevent cytotoxic edema in models of BM. RESULTS Radiation-induced astrocytic swelling and transient upregulation of AQP4 occurred within the first 24 hours following radiation. Topiramate decreased radiation-induced astrocytic swelling and loss of TEER in astrocytes in vitro, and acute short-term treatment (but not continuous administration), prevented radiation-induced increase in brain water content without pro-tumorigenic effects in multiple preclinical models of BCBM. AQP4 was expressed in clinical BM and breast-cancer cell lines, but AQP4 targeting had limited direct pro-tumorigenic or radioprotective effects in cancer cells that could impact its clinical translation. CONCLUSIONS Patients with BM could find additional benefits from acute and temporary preventive treatment of radiation-induced cytotoxic edema using anti-epileptic drugs able to block AQP4 function.
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Affiliation(s)
| | - Karen L F Alvarez-Eraso
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Jenny A Jaramillo-Gómez
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Zachary Littrell
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Nikki Tsuji
- Office of Laboratory Animal Resources, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - D Ryan Ormond
- Department of Neurosurgery, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Sana D Karam
- Department of Radiation Oncology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Peter Kabos
- Department of Medicine, Division of Medical Oncology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Diana M Cittelly
- Department of Pathology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
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23
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Chu H, Dong J, Tang Y, Huang C, Guo Q. Connexin 43 Promotes Neurogenesis via Regulating Aquaporin-4 after Cerebral Ischemia. Neurotox Res 2023; 41:349-361. [PMID: 37074591 DOI: 10.1007/s12640-023-00646-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 03/27/2023] [Accepted: 04/02/2023] [Indexed: 04/20/2023]
Abstract
We aimed to test the effects of connexin43 (Cx43) on ischemic neurogenesis and examined whether it was dependent on aquaporin-4 (AQP4). We detected the expression of Cx43 and AQP4 in the ipsilateral subventricular zone (SVZ) and peri-infarct cortex after middle cerebral artery occlusion (MCAO). Also, we examined neurogenesis in the above regions via co-labeling of 5-bromo-2-deoxyuridine (BrdU)/neuronal nuclear antigen (NeuN) and BrdU/doublecortin (DCX). The effects of Cx43 and AQP4 were investigated by using two transgenic animals: heterozygous Cx43 (Cx43±) mice and AQP4 knockout (AQP4-/-) mice, and connexin mimetic peptide (CMP), a selective Cx43 blocker. We demonstrated AQP4 and Cx43 were co-expressed in the astrocytes after MCAO and the expression was highly increased in ipsilateral SVZ and peri-infarct cortex. Cx43± mice had larger infarction volumes and worse neurological function. Both BrdU/NeuN and BrdU/DCX co-labeled cells in the two regions were reduced in Cx43± and AQP4-/- mice compared to wild-type (WT) mice, suggesting Cx43 and AQP4 participated in neurogenesis of neural stem cells. Moreover, CMP decreased AQP4 expression and inhibited neurogenesis in WT mice, while the latter failed to be observed in AQP4-/- mice. Besides, higher levels of IL-1β and TNF-α were detected in the SVZ and peri-infarct cortex of AQP4-/- and Cx43± mice than those in WT mice. In conclusion, our data suggest that Cx43 elicits neuroprotective effects after cerebral ischemia through promoting neurogenesis in the SVZ to regenerate the injured neurons, which is AQP4 dependent and associated with down-regulation of inflammatory cytokines IL-1β and TNF-α.
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Affiliation(s)
- Heling Chu
- Department of Gerontology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No. 600 Yishan Road, 200233, Shanghai, China
| | - Jing Dong
- Department of Internal Neurology, Qingdao Municipal Hospital, Qingdao, China
| | - Yuping Tang
- Department of Neurology, Huashan Hospital, Fudan University, No. 12 Mid. Wulumuqi Road, Shanghai, 200040, China.
| | - Chuyi Huang
- Health Management Center, School of Medicine, Renji Hospital, Shanghai Jiao Tong University, No. 160 Pujian Road, Shanghai, 200120, China.
| | - Qihao Guo
- Department of Gerontology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, No. 600 Yishan Road, 200233, Shanghai, China.
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24
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Berliner JA, Lam MA, Najafi E, Hemley SJ, Bilston LE, Stoodley MA. Aquaporin-4 expression and modulation in a rat model of post-traumatic syringomyelia. Sci Rep 2023; 13:9662. [PMID: 37316571 PMCID: PMC10267129 DOI: 10.1038/s41598-023-36538-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 06/06/2023] [Indexed: 06/16/2023] Open
Abstract
Aquaporin-4 (AQP4) has been implicated in post-traumatic syringomyelia (PTS), a disease characterised by the formation of fluid-filled cysts in the spinal cord. This study investigated the expression of AQP4 around a mature cyst (syrinx) and the effect of pharmacomodulation of AQP4 on syrinx size. PTS was induced in male Sprague-Dawley rats by computerized spinal cord impact and subarachnoid kaolin injection. Immunofluorescence of AQP4 was carried out on mature syrinx tissue 12 weeks post-surgery. Increased AQP4 expression corresponded to larger, multiloculated cysts (R2 = 0.94), yet no localized changes to AQP4 expression in perivascular regions or the glia limitans were present. In a separate cohort of animals, at 6 weeks post-surgery, an AQP4 agonist (AqF026), antagonist (AqB050), or vehicle was administered daily over 4 days, with MRIs performed before and after the completion of treatment. Histological analysis was performed at 12 weeks post-surgery. Syrinx volume and length were not altered with AQP4 modulation. The correlation between increased AQP4 expression with syrinx area suggests that AQP4 or the glia expressing AQP4 are recruited to regulate water movement. Given this, further investigation should examine AQP4 modulation with dose regimens at earlier time-points after PTS induction, as these may alter the course of syrinx development.
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Affiliation(s)
- Joel A Berliner
- Faculty of Medicine, Health and Human Sciences, Macquarie University, 2 Technology Place, Sydney, NSW, 2109, Australia.
| | - Magdalena A Lam
- The ANZAC Research Institute, Concord Repatriation General Hospital, Gate 3, Hospital Road, Sydney, NSW, 2139, Australia
| | - Elmira Najafi
- Faculty of Medicine, Health and Human Sciences, Macquarie University, 2 Technology Place, Sydney, NSW, 2109, Australia
| | - Sarah J Hemley
- Faculty of Medicine, Health and Human Sciences, Macquarie University, 2 Technology Place, Sydney, NSW, 2109, Australia
| | - Lynne E Bilston
- Neuroscience Research Australia, Margarete Ainsworth Building, 139 Barker Street, Sydney, NSW, 2031, Australia
- Faculty of Medicine, School of Clinical Medicine, University of New South Wales, Sydney, NSW, 2031, Australia
| | - Marcus A Stoodley
- Faculty of Medicine, Health and Human Sciences, Macquarie University, 2 Technology Place, Sydney, NSW, 2109, Australia
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25
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Wang S, Pan L, Wu R, Shao Y, Xue M, Zhu H, Min W, Zheng X, Liang Y, Zhu M. Oily fish and raw vegetable consumption can decrease the risk of AQP4-positive neuromyelitis optica spectrum disorders: a Mendelian-randomization study. Sci Rep 2023; 13:9372. [PMID: 37296187 PMCID: PMC10256733 DOI: 10.1038/s41598-023-36372-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Accepted: 06/02/2023] [Indexed: 06/12/2023] Open
Abstract
Neuromyelitis optica spectrum disorders (NMOSD) are severe inflammatory disorders of the central nervous system targeting aquaporin-4 (AQP4). The risk factors for NMOSD remain to be determined, though they may be related to diet and nutrition. This study aimed to explore the possibility of a causal relationship between specific food intake and AQP4-positive NMOSD risk. The study followed a two-sample Mendelian randomization (MR) design. Genetic instruments and self-reported information on the intake of 29 types of food were obtained from a genome-wide association study (GWAS) on 445,779 UK Biobank participants. A total of 132 individuals with AQP4-positive NMOSD and 784 controls from this GWAS were included in our study. The associations were evaluated using inverse-variance-weighted meta-analysis, weighted-median analysis, and MR-Egger regression. A high consumption of oily fish and raw vegetables was associated with a decreased risk of AQP4-positive NMOSD (odds ratio [OR] = 1.78 × 10-16, 95% confidence interval [CI] = 2.60 × 10-25-1.22 × 10-7, p = 0.001; OR = 5.28 × 10-6, 95% CI = 4.67 × 10-11-0.598, p = 0.041, respectively). The results were consistent in the sensitivity analyses, and no evidence of directional pleiotropy was observed. Our study provides useful implications for the development of AQP4-positive NMOSD prevention strategies. Further research is needed to determine the exact causal relationship and mechanisms underlying the association between specific food intake and AQP4-positive NMOSD.
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Affiliation(s)
- Shengnan Wang
- Department of Neurology, Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Lin Pan
- Clinical College, Jilin University, Changchun, China
| | - Rui Wu
- Department of Neurology, Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Yanqing Shao
- Department of Neurology, Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Mengru Xue
- Department of Neurology, Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Hao Zhu
- Department of Hepatology, The First Hospital of Jilin University, Changchun, China
| | - Wanwan Min
- Department of Neurology, Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Xiangyu Zheng
- Department of Neurology, Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Yekun Liang
- Department of Cardiology, The First Hospital of Jilin University, Changchun, China
| | - Mingqin Zhu
- Department of Neurology, Neuroscience Center, The First Hospital of Jilin University, Changchun, China.
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Tice C, Zhao H, Langford D. Single nucleotide polymorphisms in aquaporin-4 associate with cognitive impairment status in people with HIV. J Neurovirol 2023; 29:258-271. [PMID: 37191905 DOI: 10.1007/s13365-023-01126-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 02/20/2023] [Accepted: 03/13/2023] [Indexed: 05/17/2023]
Abstract
Neurocognitive impairments are more frequent in people with HIV (PWH) compared to their uninfected counterparts. HIV-associated neurocognitive disorder (HAND) is a spectrum disorder and up to 50% of PWH are reported to suffer from HAND. Altered waste clearance from the brain, chronic neuroinflammation and impaired metabolic processes may contribute to abnormal aging in PWH and are more common among those who suffer from HAND. Thus, it is important to identify earlier predictors for development of HAND. A key contributor to cognitive impairment in HIV and in Alzheimer's disease (AD) is formation and accumulation of aberrant proteins including hyperphosphorylated Tau (pTau). Previous data from AD and traumatic brain injury studies report that impaired waste clearance from the brain contributes in part to cognitive impairments. Evidence suggests that the aquaporin 4 (aqp4) gene may have an important role in waste clearance from the brain as single nucleotide polymorphisms (SNPs) in aqp4 have been reported to associate with changes in cognitive decline in AD patients. Given some similarities between HAND and AD, we assessed potential associations of several aqp4 SNPS with cognitive impairment in PWH. Our data show that homozygous carriers of the minor allele in SNPs rs3875089 and rs3763040 had significantly lower neuropsychological test Z-scores in multiple domains compared to the other genotypes. Interestingly, this decrease in Z-scores was only observed in PWH and not in HIV-control participants. Conversely, homozygosity of the minor allele of rs335929 associated with better executive function in PWH. Based on these data, tracking large cohorts of PWH to determine if the presence of these SNPs associate with cognitive changes during disease progression is of interest. Furthermore, screening PWH for SNPs that may be associated with cognitive impairment risk after diagnosis could be considered in alignment with traditional treatment plans to potentially work on skills in areas shown to have cognitive decline with these SNPs present.
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Affiliation(s)
- Caitlin Tice
- Lewis Katz School of Medicine, Temple University, 3500 N Broad St, Philadelphia, PA, 19140, USA
| | - Huaqing Zhao
- Lewis Katz School of Medicine, Temple University, 3500 N Broad St, Philadelphia, PA, 19140, USA
| | - Dianne Langford
- Lewis Katz School of Medicine, Temple University, 3500 N Broad St, Philadelphia, PA, 19140, USA.
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Nicosia M, Lee J, Beavers A, Kish D, Farr GW, McGuirk PR, Pelletier MF, Lathia JD, Fairchild RL, Valujskikh A. Water channel aquaporin 4 is required for T cell receptor mediated lymphocyte activation. J Leukoc Biol 2023; 113:544-554. [PMID: 36805947 PMCID: PMC10848298 DOI: 10.1093/jleuko/qiad010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Revised: 12/16/2022] [Accepted: 01/16/2023] [Indexed: 02/04/2023] Open
Abstract
Aquaporins are a family of ubiquitously expressed transmembrane water channels implicated in a broad range of physiological functions. We have previously reported that aquaporin 4 (AQP4) is expressed on T cells and that treatment with a small molecule AQP4 inhibitor significantly delays T cell mediated heart allograft rejection. Using either genetic deletion or small molecule inhibitor, we show that AQP4 supports T cell receptor mediated activation of both mouse and human T cells. Intact AQP4 is required for optimal T cell receptor (TCR)-related signaling events, including nuclear translocation of transcription factors and phosphorylation of proximal TCR signaling molecules. AQP4 deficiency or inhibition impairs actin cytoskeleton rearrangements following TCR crosslinking, causing inferior TCR polarization and a loss of TCR signaling. Our findings reveal a novel function of AQP4 in T lymphocytes and identify AQP4 as a potential therapeutic target for preventing TCR-mediated T cell activation.
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Affiliation(s)
- Michael Nicosia
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, United States
| | - Juyeun Lee
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, United States
| | - Ashley Beavers
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, United States
| | - Danielle Kish
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, United States
| | - George W. Farr
- Aeromics Inc., 470 James Street Suite 007, New Haven, CT 06513, United States
| | - Paul R. McGuirk
- Aeromics Inc., 470 James Street Suite 007, New Haven, CT 06513, United States
| | - Marc F. Pelletier
- Aeromics Inc., 470 James Street Suite 007, New Haven, CT 06513, United States
| | - Justin D. Lathia
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, United States
| | - Robert L. Fairchild
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, United States
| | - Anna Valujskikh
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, United States
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Wang Y, Bian J, Yao M, Du L, Xu Y, Chang H, Cong H, Wei Y, Xu W, Wang H, Zhang X, Geng X, Yin L. Targeting chemoattractant chemokine (C-C motif) ligand 2 derived from astrocytes is a promising therapeutic approach in the treatment of neuromyelitis optica spectrum disorders. Front Immunol 2023; 14:1144532. [PMID: 37056770 PMCID: PMC10086366 DOI: 10.3389/fimmu.2023.1144532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Accepted: 03/01/2023] [Indexed: 03/30/2023] Open
Abstract
Introduction Aquaporin-4 immunoglobulin G (AQP4-IgG)-induced astrocytes injury is a key mechanism in the pathogenesis of neuromyelitis spectrum disorder (NMOSD), and although CCL2 is involved, its specific role has not been reported. We aimed to further investigate the role and potential mechanisms of CCL2 in AQP4-IgG-induced astrocyte injury. Methods First, we evaluated CCL2 levels in paired samples of subject patients by automated microfluidic platform, Ella®. Second, we knock down astrocyte's CCL2 gene in vitro and in vivo to define the function of CCL2 in AQP4-IgG-induced astrocyte injury. Third, astrocyte injury and brain injury in live mice were assessed by immunofluorescence staining and 7.0T MRI, respectively. Western blotting and high-content screening were conducted to clarify the activation of inflammatory signaling pathways, and changes in CCL2 mRNA and cytokine/chemokines were measured by qPCR technique and flow cytometry, respectively. Results There were greatly higher CSF-CCL2 levels in NMOSD patients than that in other non-inflammatory neurological diseases (OND) groups. Blocking astrocyte CCL2 gene expression can efficiently mitigate AQP4-IgG-induced damage in vitro and in vivo. Interestingly, prevention of CCL2 expression could decrease other inflammatory cytokines released, including IL-6 and IL-1β. Our data suggest that CCL2 involves in the initiation and plays a pivotal role in AQP4-IgG-damaged astrocytes. Discussion Our results indicate that CCL2 may serve as a promising candidate target for inflammatory disorder therapy, including NMOSD.
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Affiliation(s)
- Yupeng Wang
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- China National Clinical Research Center for Neurological Diseases, Beijing, China
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, Beijing, China
- Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jiangping Bian
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Mengyuan Yao
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Li Du
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Yun Xu
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Haoxiao Chang
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Hengri Cong
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Yuzhen Wei
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Wangshu Xu
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Huabing Wang
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Xinghu Zhang
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Xingchao Geng
- National Center for Safety Evaluation of Drugs, National Institutes for Food and Drug Control, Beijing, China
| | - Linlin Yin
- Department of Neuroinfection and Neuroimmunology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- China National Clinical Research Center for Neurological Diseases, Beijing, China
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Gomolka RS, Hablitz LM, Mestre H, Giannetto M, Du T, Hauglund NL, Xie L, Peng W, Martinez PM, Nedergaard M, Mori Y. Loss of aquaporin-4 results in glymphatic system dysfunction via brain-wide interstitial fluid stagnation. eLife 2023; 12:82232. [PMID: 36757363 PMCID: PMC9995113 DOI: 10.7554/elife.82232] [Citation(s) in RCA: 24] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 02/08/2023] [Indexed: 02/10/2023] Open
Abstract
The glymphatic system is a fluid transport network of cerebrospinal fluid (CSF) entering the brain along arterial perivascular spaces, exchanging with interstitial fluid (ISF), ultimately establishing directional clearance of interstitial solutes. CSF transport is facilitated by the expression of aquaporin-4 (AQP4) water channels on the perivascular endfeet of astrocytes. Mice with genetic deletion of AQP4 (AQP4 KO) exhibit abnormalities in the brain structure and molecular water transport. Yet, no studies have systematically examined how these abnormalities in structure and water transport correlate with glymphatic function. Here, we used high-resolution 3D magnetic resonance (MR) non-contrast cisternography, diffusion-weighted MR imaging (MR-DWI) along with intravoxel-incoherent motion (IVIM) DWI, while evaluating glymphatic function using a standard dynamic contrast-enhanced MR imaging to better understand how water transport and glymphatic function is disrupted after genetic deletion of AQP4. AQP4 KO mice had larger interstitial spaces and total brain volumes resulting in higher water content and reduced CSF space volumes, despite similar CSF production rates and vascular density compared to wildtype mice. The larger interstitial fluid volume likely resulted in increased slow but not fast MR diffusion measures and coincided with reduced glymphatic influx. This markedly altered brain fluid transport in AQP4 KO mice may result from a reduction in glymphatic clearance, leading to enlargement and stagnation of fluid in the interstitial space. Overall, diffusion MR is a useful tool to evaluate glymphatic function and may serve as valuable translational biomarker to study glymphatics in human disease.
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Affiliation(s)
| | - Lauren M Hablitz
- Center for Translational Neuromedicine, University of Rochester Medical CenterRochesterUnited States
| | - Humberto Mestre
- Center for Translational Neuromedicine, University of Rochester Medical CenterRochesterUnited States
- Department of Neurology, University of PennsylvaniaPhiladelphiaUnited States
| | - Michael Giannetto
- Center for Translational Neuromedicine, University of Rochester Medical CenterRochesterUnited States
| | - Ting Du
- Center for Translational Neuromedicine, University of Rochester Medical CenterRochesterUnited States
- School of Pharmacy, China Medical UniversityShenyangChina
| | | | - Lulu Xie
- Center for Translational Neuromedicine, University of Rochester Medical CenterRochesterUnited States
| | - Weiguo Peng
- Center for Translational Neuromedicine, University of CopenhagenCopenhagenDenmark
- Center for Translational Neuromedicine, University of Rochester Medical CenterRochesterUnited States
| | | | - Maiken Nedergaard
- Center for Translational Neuromedicine, University of CopenhagenCopenhagenDenmark
- Center for Translational Neuromedicine, University of Rochester Medical CenterRochesterUnited States
| | - Yuki Mori
- Center for Translational Neuromedicine, University of CopenhagenCopenhagenDenmark
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Mayo F, González-Vinceiro L, Hiraldo-González L, Calle-Castillejo C, Morales-Alvarez S, Ramírez-Lorca R, Echevarría M. Aquaporin-4 Expression Switches from White to Gray Matter Regions during Postnatal Development of the Central Nervous System. Int J Mol Sci 2023; 24:3048. [PMID: 36769371 PMCID: PMC9917791 DOI: 10.3390/ijms24033048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 01/24/2023] [Accepted: 01/31/2023] [Indexed: 02/09/2023] Open
Abstract
Aquaporin-4 (AQP4) is the most abundant water channel in the central nervous system and plays a fundamental role in maintaining water homeostasis there. In adult mice, AQP4 is located mainly in ependymal cells, in the endfeet of perivascular astrocytes, and in the glia limitans. Meanwhile, its expression, location, and function throughout postnatal development remain largely unknown. Here, the expression of AQP4 mRNA was studied by in situ hybridization and RT-qPCR, and the localization and amount of protein was studied by immunofluorescence and western blotting, both in the brain and spinal cord. For this, wild-type mice of the C57BL/6 line, aged 1, 3, 7, 11, 20, and 60 days, and 18 months were used. The results showed a change in both the expression and location of AQP4 in postnatal development compared to those during adult life. In the early stages of postnatal development it appears in highly myelinated areas, such as the corpus callosum or cerebellum, and as the animal grows, it disappears from these areas, passing through the cortical regions of the forebrain and concentrating around the blood vessels. These findings suggest an unprecedented possible role for AQP4 in the early cell differentiation process, during the first days of life in the newborn animal, which will lead to myelination.
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Affiliation(s)
- Francisco Mayo
- Institute of Biomedicine of Seville (IBiS), Virgen del Rocío University Hospital, (HUVR)/Spanish National Research Council (CSIC)/University of Seville, 41013 Seville, Spain
- Department of Physiology and Biophysics, University of Seville, 41009 Seville, Spain
| | - Lourdes González-Vinceiro
- Institute of Biomedicine of Seville (IBiS), Virgen del Rocío University Hospital, (HUVR)/Spanish National Research Council (CSIC)/University of Seville, 41013 Seville, Spain
- Department of Physiology and Biophysics, University of Seville, 41009 Seville, Spain
| | - Laura Hiraldo-González
- Institute of Biomedicine of Seville (IBiS), Virgen del Rocío University Hospital, (HUVR)/Spanish National Research Council (CSIC)/University of Seville, 41013 Seville, Spain
- Department of Physiology and Biophysics, University of Seville, 41009 Seville, Spain
| | - Claudia Calle-Castillejo
- Institute of Biomedicine of Seville (IBiS), Virgen del Rocío University Hospital, (HUVR)/Spanish National Research Council (CSIC)/University of Seville, 41013 Seville, Spain
| | - Sara Morales-Alvarez
- Institute of Biomedicine of Seville (IBiS), Virgen del Rocío University Hospital, (HUVR)/Spanish National Research Council (CSIC)/University of Seville, 41013 Seville, Spain
| | - Reposo Ramírez-Lorca
- Institute of Biomedicine of Seville (IBiS), Virgen del Rocío University Hospital, (HUVR)/Spanish National Research Council (CSIC)/University of Seville, 41013 Seville, Spain
- Department of Physiology and Biophysics, University of Seville, 41009 Seville, Spain
| | - Miriam Echevarría
- Institute of Biomedicine of Seville (IBiS), Virgen del Rocío University Hospital, (HUVR)/Spanish National Research Council (CSIC)/University of Seville, 41013 Seville, Spain
- Department of Physiology and Biophysics, University of Seville, 41009 Seville, Spain
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Silva GD, Apóstolos-Pereira SL, Callegaro D. Estimated prevalence of AQP4 positive neuromyelitis optica spectrum disorder and MOG antibody associated disease in São Paulo, Brazil. Mult Scler Relat Disord 2023; 70:104488. [PMID: 36610359 DOI: 10.1016/j.msard.2022.104488] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 11/25/2022] [Accepted: 12/22/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND Numerous studies addressed the prevalence of multiple sclerosis, but prevalence studies of NMOSD and, particularly, MOGAD are scarce. We aimed to estimate the prevalence of NMOSD and MOGAD in the city of São Paulo, based on the known prevalence of MS. METHODS In this observational study, we determined the total number of patients with central nervous system demyelinating disease on regular follow-up in a university referral center in São Paulo, from May 2019 to May 2021 according to the diagnosis of multiple sclerosis (MS), NMOSD and MOGAD using the current diagnostic criteria for these diseases. We used the MS: NMOSD and MS: MOGAD ratios to estimate the ratio of these diseases in São Paulo, Brazil. RESULTS We identified 968 patients with MS, 133 patients with AQP4 positive NMOSD, and 28 patients with MOGAD. We found the MS: NMOSD ratio of 7,28 and the MS: MOGAD ratio of 34,57. We estimated a prevalence of 2,1 per 100,000 inhabitants for NMOSD and of 0,4 per 100,000 inhabitants for MOGAD. CONCLUSION The prevalence of NMOSD is high in São Paulo, but the prevalence of MOGAD is low when compared with the prevalence found in most of the studies reported to date.
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Affiliation(s)
- Guilherme Diogo Silva
- Neurology Division, University of São Paulo, Dr Enéas de Carvalho Aguiar, 255, São Paulo, Brazil.
| | | | - Dagoberto Callegaro
- Neurology Division, University of São Paulo, Dr Enéas de Carvalho Aguiar, 255, São Paulo, Brazil
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Aslesh T, Al-aghbari A, Yokota T. Assessing the Role of Aquaporin 4 in Skeletal Muscle Function. Int J Mol Sci 2023; 24:ijms24021489. [PMID: 36675000 PMCID: PMC9865462 DOI: 10.3390/ijms24021489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/09/2023] [Accepted: 01/09/2023] [Indexed: 01/15/2023] Open
Abstract
Water transport across the biological membranes is mediated by aquaporins (AQPs). AQP4 and AQP1 are the predominantly expressed AQPs in the skeletal muscle. Since the discovery of AQP4, several studies have highlighted reduced AQP4 levels in Duchenne muscular dystrophy (DMD) patients and mouse models, and other neuromuscular disorders (NMDs) such as sarcoglycanopathies and dysferlinopathies. AQP4 loss is attributed to the destabilizing dystrophin-associated protein complex (DAPC) in DMD leading to compromised water permeability in the skeletal muscle fibers. However, AQP4 knockout (KO) mice appear phenotypically normal. AQP4 ablation does not impair physical activity in mice but limits them from achieving the performance demonstrated by wild-type mice. AQP1 levels were found to be upregulated in DMD models and are thought to compensate for AQP4 loss. Several groups investigated the expression of other AQPs in the skeletal muscle; however, these findings remain controversial. In this review, we summarize the role of AQP4 with respect to skeletal muscle function and findings in NMDs as well as the implications from a clinical perspective.
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Affiliation(s)
- Tejal Aslesh
- Neuroscience and Mental Health Institute, Faculty of Medicine and Dentistry, University of Alberta, 116 St. and 85 Ave., Edmonton, AB T6G 2E1, Canada
| | - Ammar Al-aghbari
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, 116 St. and 85 Ave., Edmonton, AB T6G 2E1, Canada
| | - Toshifumi Yokota
- Neuroscience and Mental Health Institute, Faculty of Medicine and Dentistry, University of Alberta, 116 St. and 85 Ave., Edmonton, AB T6G 2E1, Canada
- Department of Medical Genetics, Faculty of Medicine and Dentistry, University of Alberta, 116 St. and 85 Ave., Edmonton, AB T6G 2E1, Canada
- The Friends of Garret Cumming Research and Muscular Dystrophy Canada HM Toupin Neurological Science Research Chair, 8812 112 St., Edmonton, AB T6G 2H7, Canada
- Correspondence: ; Tel.: +1-(780)-492-1102
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Li Y, Zhang L, Zhang Y, Miao Z, Liu Z, Zhou G, He J, Ding N, Zhou H, Zhou T, Niu F, Li J, Liu Y. Potential molecular mechanism of Guiqi Baizhu Decoction in radiation-induced intestinal edema by regulating HIF-1a, AQP4 and Na +/K +-ATPase. Phytomedicine 2022; 107:154445. [PMID: 36130463 DOI: 10.1016/j.phymed.2022.154445] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 07/05/2022] [Accepted: 09/05/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Guiqi Baizhu Decoction (GQBZD) has a good protective effect on radiation-induced intestinal edema (RIIE). However, the underlying molecular mechanisms need further elucidation. PURPOSE To reveal the potential mechanism of RIIE and GQBZD treatment. METHODS SD rats were irradiated with 6Gy X-ray to establish RIIE model. The general condition of the rats was observed; the dry/wet weight ratio of colon tissue was detected; the morphological changes of colon tissue were observed by HE staining; the expressions of ROS, HIF-1α and AQP4 in colon tissue were detected by confocal laser scanning; the expression of edema-related proteins was detected by Western blot. In addition, human colon epithelial cells (NCM460) was irradiated with 2Gy X-ray, and HIF-1α expression in NCM460 was knocked down by small interfering RNA (siRNA) transfection, and the activity of Na+/K+-ATPase was detected by enzyme activity kit; the ROS expression was detected by flow cytometer; the AQP4 expression was detected by laser confocal microscopy; and the expression of edema-related proteins were detected by Western blot. RESULTS We found that after irradiation, the colon tissue of rats was significantly edema, mainly manifested as mucosal and submucosal edema, and the ultrastructure was reflected in the structural damage of nucleus and mitochondria. ROS, HIF-1α and AQP4 were significantly expressed, and Na+/K+-ATPase expression/activity was decreased. After the intervention of GQBZD, the edema of the colon tissue of the rats was improved, the expressions of ROS, HIF-1α and AQP4 were decreased, and the expression/activity of Na+/K+-ATPase was increased. CONCLUSION Ionizing radiation (IR) can cause significant intestinal edema. AQP4 and Na+/K+-ATPase are the key factors of RIIE, which are regulated by ROS and HIF-1α. GQBZD can improve hypoxia and oxidative stress, regulate the expression of AQP4 and Na+/K+-ATPase, and achieve a protective effect on RIIE. This study is the first to reveal the mechanism of RIIE.
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Affiliation(s)
- Yangyang Li
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China
| | - Liying Zhang
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China; Gansu Institute of Cardiovascular Diseases, Lanzhou, China
| | - Yiming Zhang
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China
| | - Zhiming Miao
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China
| | - Zhiwei Liu
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China
| | - Gucheng Zhou
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China
| | - Jinpeng He
- Key Laboratory of Space Radiobiology of Gansu Province & Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Nan Ding
- Key Laboratory of Space Radiobiology of Gansu Province & Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Heng Zhou
- Key Laboratory of Space Radiobiology of Gansu Province & Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Ting Zhou
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China
| | - Fan Niu
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China
| | - Jing Li
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China
| | - Yongqi Liu
- Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese Medicine, Lanzhou, China; Key Laboratory of Medicine and Translation of the Ministry of Education of Dunhuang,Lanzhou,China.
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Yi Y, Qiu G, Liu H, Gao F, Liu X, Chen Y, Yang M. Hypotonic induction of aquaporin5 expression in rat astrocytes through p38 MAPK pathway. Anat Histol Embryol 2022; 51:769-780. [PMID: 36006764 DOI: 10.1111/ahe.12854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 07/27/2022] [Accepted: 08/14/2022] [Indexed: 11/30/2022]
Abstract
Brain oedema is a common pathological phenomenon following many diseases and may lead to severe secondary damage. Astrocytes are the most numerous cells in the brain. Five aquaporins (AQPs) have been found in mature astrocytes, which play crucial roles in water transportation. However, most studies have focused on AQP4 or AQP9 and whether another aquaporin such as AQP5 involved in brain oedema is unclear. Here, we addressed the issue that the expression pattern of AQP5 in rat astrocytes in vitro was altered in the hypotonic condition through some mitogen-activated protein kinases (MAPK) pathways. Primary astrocytes were randomly divided into the control group and the hypotonic group. Cell viability was evaluated by MTT test. Immunofluorescence, Western blotting and real-time PCR were used to detect the expression of AQP5. Western blotting was used to detect the variation of MAPK pathway. The present study demonstrated that incubation of astrocytes in the hypotonic medium produced an increase inAQP5 expression, and AQP5 peaked at 6-12 h after hypotension solution exposure. In addition, MAPK pathways were set in motion under hypotension, but not all branches. Only the p38 inhibitor can inhibit AQP5 expression in cultured astrocytes. AQP5 is directly related to the extracellular hypotonic stimuli in astrocytes, which could be regulated through the p38 MAPK pathway.
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Affiliation(s)
- Yaoxing Yi
- Department of Anatomy, Institute of Neuroscience, College of Basic Medicine, Chongqing Medical University, Chongqing, China
- Lab Teaching and Management Center, Chongqing Medical University, Chongqing, China
| | - Guoping Qiu
- Department of Anatomy, Institute of Neuroscience, College of Basic Medicine, Chongqing Medical University, Chongqing, China
| | - Hui Liu
- Department of Anatomy, Institute of Neuroscience, College of Basic Medicine, Chongqing Medical University, Chongqing, China
| | - Fei Gao
- Department of Urology, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Xueyuan Liu
- Department of Anatomy, Institute of Neuroscience, College of Basic Medicine, Chongqing Medical University, Chongqing, China
| | - Yuqing Chen
- Department of Anatomy, Institute of Neuroscience, College of Basic Medicine, Chongqing Medical University, Chongqing, China
| | - Mei Yang
- Department of Anatomy, Institute of Neuroscience, College of Basic Medicine, Chongqing Medical University, Chongqing, China
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Tabansky I, Tanaka AJ, Wang J, Zhang G, Dujmovic I, Mader S, Jeganathan V, DeAngelis T, Funaro M, Harel A, Messina M, Shabbir M, Nursey V, DeGouvia W, Laurent M, Blitz K, Jindra P, Gudesblatt M, King A, Drulovic J, Yunis E, Brusic V, Shen Y, Keskin DB, Najjar S, Stern JNH. Rare variants and HLA haplotypes associated in patients with neuromyelitis optica spectrum disorders. Front Immunol 2022; 13:900605. [PMID: 36268024 PMCID: PMC9578444 DOI: 10.3389/fimmu.2022.900605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Accepted: 07/21/2022] [Indexed: 11/30/2022] Open
Abstract
Neuromyelitis optica spectrum disorders (NMOSD) are rare, debilitating autoimmune diseases of the central nervous system. Many NMOSD patients have antibodies to Aquaporin-4 (AQP4). Prior studies show associations of NMOSD with individual Human Leukocyte Antigen (HLA) alleles and with mutations in the complement pathway and potassium channels. HLA allele associations with NMOSD are inconsistent between populations, suggesting complex relationships between the identified alleles and risk of disease. We used a retrospective case-control approach to identify contributing genetic variants in patients who met the diagnostic criteria for NMOSD and their unaffected family members. Potentially deleterious variants identified in NMOSD patients were compared to members of their families who do not have the disease and to existing databases of human genetic variation. HLA sequences from patients from Belgrade, Serbia, were compared to the frequency of HLA haplotypes in the general population in Belgrade. We analyzed exome sequencing on 40 NMOSD patients and identified rare inherited variants in the complement pathway and potassium channel genes. Haplotype analysis further detected two haplotypes, HLA-A*01, B*08, DRB1*03 and HLA-A*01, B*08, C*07, DRB1*03, DQB1*02, which were more prevalent in NMOSD patients than in unaffected individuals. In silico modeling indicates that HLA molecules within these haplotypes are predicted to bind AQP4 at several sites, potentially contributing to the development of autoimmunity. Our results point to possible autoimmune and neurodegenerative mechanisms that cause NMOSD, and can be used to investigate potential NMOSD drug targets.
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Affiliation(s)
- Inna Tabansky
- Department of Neurology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Urology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Molecular Medicine, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Science Education, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
- Department of Neurobiology and Behavior, The Rockefeller University, New York, NY, United States
| | - Akemi J. Tanaka
- Department of Pediatrics, Columbia University College of Physicians and Surgeons, New York, NY, United States
| | - Jiayao Wang
- Department of Pediatrics, Columbia University College of Physicians and Surgeons, New York, NY, United States
- Department of Biomedical Informatics and Department of Systems Biology, Columbia University, New York, NY, United States
| | - Guanglan Zhang
- Department of Computer Science, Boston University, Boston, MA, United States
| | - Irena Dujmovic
- Clinical Center of Serbia University School of Medicine, Belgrade, Serbia
- Department of Neurology, University of North Carolina School of Medicine, Chapel Hill, NC, United States
| | - Simone Mader
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
- Biomedical Center and University Hospitals, Ludwig Maximilian University Munich, Munich, Germany
| | - Venkatesh Jeganathan
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
| | - Tracey DeAngelis
- Department of Neurology, Neurological Associates of Long Island, New Hyde Park, NY, United States
| | - Michael Funaro
- Department of Neurology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Urology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Molecular Medicine, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Science Education, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
| | - Asaff Harel
- Department of Neurology, Lenox Hill Hospital, Northwell Health, New York, NY, United States
| | - Mark Messina
- Department of Neurology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Urology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Molecular Medicine, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Science Education, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
| | - Maya Shabbir
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
| | - Vishaan Nursey
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
| | - William DeGouvia
- Department of Neurology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Urology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Molecular Medicine, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Science Education, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
| | - Micheline Laurent
- Department of Neurology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Urology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Molecular Medicine, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Science Education, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
| | - Karen Blitz
- Department of Neurology, South Shore Neurologic Associates, Patchogue, NY, United States
| | - Peter Jindra
- Division of Abdominal Transplantation, Baylor College of Medicine, Baylor College of Medicine, Houston, TX, United States
| | - Mark Gudesblatt
- Biomedical Center and University Hospitals, Ludwig Maximilian University Munich, Munich, Germany
| | | | - Alejandra King
- Regeneron Genetics Center, Regeneron Pharmaceuticals Inc., Tarrytown, NY, United States
| | - Jelena Drulovic
- Clinical Center of Serbia University School of Medicine, Belgrade, Serbia
| | - Edmond Yunis
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, United States
| | - Vladimir Brusic
- School of Computer Science, University of Nottingham Ningbo China, Ningbo, China
| | - Yufeng Shen
- Department of Biomedical Informatics and Department of Systems Biology, Columbia University, New York, NY, United States
| | - Derin B. Keskin
- Department of Translational Immuno-Genomics for Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA, United States
- Department of Medicine, Brigham and Women’s Hospital, Boston, MA, United States
| | - Souhel Najjar
- Department of Neurology, Lenox Hill Hospital, Northwell Health, New York, NY, United States
| | - Joel N. H. Stern
- Department of Neurology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Urology, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Molecular Medicine, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Department of Science Education, Donald and Barbra Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
- Institute of Molecular Medicine, The Feinstein Institutes for Medical Research, Manhasset, NY, United States
- *Correspondence: Joel N. H. Stern, ;
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Sapkota D, Florian C, Doherty BM, White KM, Reardon KM, Ge X, Garbow JR, Yuede CM, Cirrito JR, Dougherty JD. Aqp4 stop codon readthrough facilitates amyloid-β clearance from the brain. Brain 2022; 145:2982-2990. [PMID: 36001414 PMCID: PMC10233234 DOI: 10.1093/brain/awac199] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 05/08/2022] [Accepted: 05/15/2022] [Indexed: 01/07/2023] Open
Abstract
Alzheimer's disease is initiated by the toxic aggregation of amyloid-β. Immunotherapeutics aimed at reducing amyloid beta are in clinical trials but with very limited success to date. Identification of orthogonal approaches for clearing amyloid beta may complement these approaches for treating Alzheimer's disease. In the brain, the astrocytic water channel Aquaporin 4 is involved in clearance of amyloid beta, and the fraction of Aquaporin 4 found perivascularly is decreased in Alzheimer's disease. Further, an unusual stop codon readthrough event generates a conserved C-terminally elongated variant of Aquaporin 4 (AQP4X), which is exclusively perivascular. However, it is unclear whether the AQP4X variant specifically mediates amyloid beta clearance. Here, using Aquaporin 4 readthrough-specific knockout mice that still express normal Aquaporin 4, we determine that this isoform indeed mediates amyloid beta clearance. Further, with high-throughput screening and counterscreening, we identify small molecule compounds that enhance readthrough of the Aquaporin 4 sequence and validate a subset on endogenous astrocyte Aquaporin 4. Finally, we demonstrate these compounds enhance brain amyloid-β clearance in vivo, which depends on AQP4X. This suggests derivatives of these compounds may provide a viable pharmaceutical approach to enhance clearance of amyloid beta and potentially other aggregating proteins in neurodegenerative disease.
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Affiliation(s)
- Darshan Sapkota
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Biological Sciences, The University of Texas at Dallas, Richardson, TX 75080, USA
| | - Colin Florian
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Brookelyn M Doherty
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Kelli M White
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Kate M Reardon
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Xia Ge
- Department of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA
- Intellectual and Developmental Disabilities Research Center, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Joel R Garbow
- Department of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA
- Intellectual and Developmental Disabilities Research Center, Washington University School of Medicine, St. Louis, MO 63110, USA
- Alvin J Siteman Cancer Center, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Carla M Yuede
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - John R Cirrito
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Joseph D Dougherty
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110, USA
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Liu Y, Wang Z, Cao C, Xu Z, Lu J, Shen H, Li X, Li H, Wu J, Chen G. Aquaporin 4 Depolarization-Enhanced Transferrin Infiltration Leads to Neuronal Ferroptosis after Subarachnoid Hemorrhage in Mice. Oxid Med Cell Longev 2022; 2022:8808677. [PMID: 35761873 PMCID: PMC9233479 DOI: 10.1155/2022/8808677] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 05/30/2022] [Accepted: 06/03/2022] [Indexed: 12/19/2022]
Abstract
The infiltration of blood components into the brain parenchyma through the lymphoid system is an important cause of subarachnoid hemorrhage injury. AQP4, a water channel protein located at the astrocyte foot, has been reported to regulate blood-brain barrier integrity, and its polarization is disrupted after SAH. Neuronal ferroptosis is involved in subarachnoid hemorrhage- (SAH-) induced brain injury, but the inducing factors are not completely clear. Transferrin is one of the inducing factors of ferroptosis. This study is aimed at researching the role and mechanism of AQP4 in brain injury after subarachnoid hemorrhage in mice. An experimental mouse SAH model was established by endovascular perforation. An AAV vector encoding AQP4 with a GFAP-specific promoter was administered to mice to achieve specific overexpression of AQP4 in astrocytes. PI staining, Fer-1 intervention, and transmission electron microscopy were used to detect neuronal ferroptosis, and dextran (40 kD) leakage was used to detect BBB integrity. Western blot analysis of perfused brain tissue protein samples was used to detect transferrin infiltration. First, neuronal ferroptosis 24 h after SAH was observed by PI staining and Fer-1 intervention. Second, a significant increase in transferrin infiltration was found in the brain parenchyma 24 h after SAH modeling, while transferrin content was positively correlated with neuronal ferroptosis. Then, we observed that AQP4 overexpression effectively improved AQP depolarization and BBB injury induced by SAH and significantly reduced transferrin infiltration and neuronal ferroptosis after SAH. Finally, we found that AQP4 overexpression could effectively improve the neurobehavioral ability of SAH mice, and the neurobehavioral ability was negatively correlated with transferrin brain content. Taken together, these data indicate that overexpression of AQP4 in the mouse brain can effectively improve post-SAH neuronal ferroptosis and brain injury, at least partly by inhibiting transferrin infiltration into the brain parenchyma in the glymphatic system.
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Affiliation(s)
- Yuan Liu
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
| | - Zongqi Wang
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
| | - Chang Cao
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
| | - Zhongmou Xu
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
| | - Jinxin Lu
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
| | - Haitao Shen
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
| | - Xiang Li
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
| | - Haiying Li
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
| | - Jiang Wu
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
| | - Gang Chen
- Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street Suzhou Jiangsu Province 215006, China
- Institute of Stroke Research, Soochow University, China
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Kimball EC, Quillen S, Pease ME, Keuthan C, Nagalingam A, Zack DJ, Johnson TV, Quigley HA. Aquaporin 4 is not present in normal porcine and human lamina cribrosa. PLoS One 2022; 17:e0268541. [PMID: 35709078 PMCID: PMC9202842 DOI: 10.1371/journal.pone.0268541] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 05/03/2022] [Indexed: 02/02/2023] Open
Abstract
Aquaporin 4 is absent from astrocytes in the rodent optic nerve head, despite high expression in the retina and myelinated optic nerve. The purpose of this study was to quantify regional aquaporin channel expression in astrocytes of the porcine and human mouse optic nerve (ON). Ocular tissue sections were immunolabeled for aquaporins 1(AQP1), 4(AQP4), and 9(AQP9), myelin basic protein (MBP), glial fibrillary acidic protein (GFAP) and alpha-dystroglycan (αDG) for their presence in retina, lamina, myelin transition zone (MTZ, region just posterior to lamina) and myelinated ON (MON). Semi- quantification of AQP4 labeling & real-time quantitative PCR (qPCR) data were analyzed in retina and ON tissue. Porcine and control human eyes had abundant AQP4 in Müller cells, retinal astrocytes, and myelinated ON (MON), but minimal expression in the lamina cribrosa. AQP1 and AQP9 were present in retina, but not in the lamina. Immunolabeling of GFAP and αDG was similar in lamina, myelin transition zone (MTZ) and MON regions. Semi-quantitative AQP4 labeling was at background level in lamina, increasing in the MTZ, and highest in the MON (lamina vs MTZ, MON; p≤0.05, p≤0.01, respectively). Expression of AQP4 mRNA was minimal in lamina and substantial in MTZ and MON, while GFAP mRNA expression was uniform among the lamina, MTZ, and MON regions. Western blot assay showed AQP4 protein expression in the MON samples, but none was detected in the lamina tissue. The minimal presence of AQP4 in the lamina is a specific regional phenotype of astrocytes in the mammalian optic nerve head.
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Affiliation(s)
- Elizabeth C. Kimball
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Sarah Quillen
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Mary E. Pease
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Casey Keuthan
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Aru Nagalingam
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Donald J. Zack
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Thomas V. Johnson
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Harry A. Quigley
- Glaucoma Center of Excellence, Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, United States of America
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Rana T, Behl T, Shamsuzzaman M, Singh S, Sharma N, Sehgal A, Alshahrani AM, Aldahish A, Chidambaram K, Dailah HG, Bhatia S, Bungau S. Exploring the role of astrocytic dysfunction and AQP4 in depression. Cell Signal 2022; 96:110359. [PMID: 35597427 DOI: 10.1016/j.cellsig.2022.110359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 05/15/2022] [Accepted: 05/15/2022] [Indexed: 11/20/2022]
Abstract
Aquaporin-4 (AQP4) is the water regulating channel found in the terminal processes of astrocytes in the brain and is implicated in regulating the astrocyte functions, whereas in neuropathologies, AQP4 performs an important role in astrocytosis and release of proinflammatory cytokines. However, several findings have revealed the modulation of the AQP4 water channel in the etiopathogenesis of various neuropsychiatric diseases. In the current article, we have summarized the recent studies and highlighted the implication of astrocytic dysfunction and AQP4 in the etiopathogenesis of depressive disorder. Most of the studies have measured the AQP4 gene or protein expression in the brain regions, particularly the locus coeruleus, choroid plexus, prefrontal cortex, and hippocampus, and found that in these brain regions, AQP4 gene expression decreased on exposure to chronic mild stress. Few studies also measured the peripheral AQP4 mRNA expression in the blood and AQP4 autoantibodies in the blood serum and revealed no change in the depressed patients in comparison with normal individuals.
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Affiliation(s)
- Tarapati Rana
- Chitkara College of Pharmacy, Chitkara University, Punjab, India; Government Pharmacy College, Seraj, Mandi, Himachal Pradesh, India
| | - Tapan Behl
- Chitkara College of Pharmacy, Chitkara University, Punjab, India.
| | - Md Shamsuzzaman
- Department of Pharmaceutical Sciences, College of Pharmacy, Shaqra University, Saudi Arabia
| | - Sukhbir Singh
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Neelam Sharma
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Aayush Sehgal
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Asma M Alshahrani
- Department of Clinical Pharmacy, Faculty of Pharmacy, King Khalid University, Abha, Saudi Arabia
| | - Afaf Aldahish
- Department of Pharmacology, Faculty of Pharmacy, King Khalid University, Abha, Saudi Arabia
| | - Kumarappan Chidambaram
- Department of Pharmacology, Faculty of Pharmacy, King Khalid University, Abha, Saudi Arabia
| | - Hamad Ghaleb Dailah
- Research and Scientific Studies Unit, College of Nursing, Jazan University, Jazan, Saudi Arabia
| | - Saurabh Bhatia
- Natural & Medical Sciences Research Centre, University of Nizwa, Nizwa, Oman; School of Health Science, University of Petroleum and Energy Studies, Dehradun, Uttarakhand, India
| | - Simona Bungau
- Department of Pharmacy, Faculty of Medicine of Pharmacy, University of Oradea, Oradea, Romania
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40
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Simon M, Wang MX, Ismail O, Braun M, Schindler AG, Reemmer J, Wang Z, Haveliwala MA, O’Boyle RP, Han WY, Roese N, Grafe M, Woltjer R, Boison D, Iliff JJ. Loss of perivascular aquaporin-4 localization impairs glymphatic exchange and promotes amyloid β plaque formation in mice. Alzheimers Res Ther 2022; 14:59. [PMID: 35473943 PMCID: PMC9040291 DOI: 10.1186/s13195-022-00999-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 04/04/2022] [Indexed: 02/02/2023]
Abstract
BACKGROUND Slowed clearance of amyloid β (Aβ) is believed to underlie the development of Aβ plaques that characterize Alzheimer's disease (AD). Aβ is cleared in part by the glymphatic system, a brain-wide network of perivascular pathways that supports the exchange of cerebrospinal and brain interstitial fluid. Glymphatic clearance, or perivascular CSF-interstitial fluid exchange, is dependent on the astroglial water channel aquaporin-4 (AQP4) as deletion of Aqp4 in mice slows perivascular exchange, impairs Aβ clearance, and promotes Aβ plaque formation. METHODS To define the role of AQP4 in human AD, we evaluated AQP4 expression and localization in a human post mortem case series. We then used the α-syntrophin (Snta1) knockout mouse model which lacks perivascular AQP4 localization to evaluate the effect that loss of perivascular AQP4 localization has on glymphatic CSF tracer distribution. Lastly, we crossed this line into a mouse model of amyloidosis (Tg2576 mice) to evaluate the effect of AQP4 localization on amyloid β levels. RESULTS In the post mortem case series, we observed that the perivascular localization of AQP4 is reduced in frontal cortical gray matter of subjects with AD compared to cognitively intact subjects. This decline in perivascular AQP4 localization was associated with increasing Aβ and neurofibrillary pathological burden, and with cognitive decline prior to dementia onset. In rodent studies, Snta1 gene deletion slowed CSF tracer influx and interstitial tracer efflux from the mouse brain and increased amyloid β levels. CONCLUSIONS These findings suggest that the loss of perivascular AQP4 localization may contribute to the development of AD pathology in human populations.
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Affiliation(s)
- Matthew Simon
- Neuroscience Graduate Program, Oregon Health & Science University, Portland, OR USA
- Department of Anesthesiology and Perioperative Medicine, Oregon Health & Science University, Portland, OR USA
| | - Marie Xun Wang
- Department of Anesthesiology and Perioperative Medicine, Oregon Health & Science University, Portland, OR USA
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA USA
| | - Ozama Ismail
- Department of Anesthesiology and Perioperative Medicine, Oregon Health & Science University, Portland, OR USA
- Center for Advanced Biomedical Imaging, University College London, London, UK
| | - Molly Braun
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA USA
- VISN 20 Mental Illness Research, Education and Clinical Center (MIRECC), VA Puget Sound Health Care System, 1660 S Columbian Wy., Seattle, WA 98108 USA
| | - Abigail G. Schindler
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA USA
- VISN 20 Geriatric Research, Education and Clinical Center (GRECC), VA Puget Sound Health Care System, Seattle, WA USA
| | - Jesica Reemmer
- Robert Stone Dow Neurobiology Laboratories, Legacy Research Institute, Portland, OR USA
| | - Zhongya Wang
- Robert Stone Dow Neurobiology Laboratories, Legacy Research Institute, Portland, OR USA
| | - Mariya A. Haveliwala
- VISN 20 Mental Illness Research, Education and Clinical Center (MIRECC), VA Puget Sound Health Care System, 1660 S Columbian Wy., Seattle, WA 98108 USA
| | - Ryan P. O’Boyle
- VISN 20 Mental Illness Research, Education and Clinical Center (MIRECC), VA Puget Sound Health Care System, 1660 S Columbian Wy., Seattle, WA 98108 USA
| | - Warren Y. Han
- VISN 20 Mental Illness Research, Education and Clinical Center (MIRECC), VA Puget Sound Health Care System, 1660 S Columbian Wy., Seattle, WA 98108 USA
| | - Natalie Roese
- Department of Anesthesiology and Perioperative Medicine, Oregon Health & Science University, Portland, OR USA
| | - Marjorie Grafe
- Department of Pathology, Oregon Health & Science University, Portland, OR USA
| | - Randall Woltjer
- Department of Pathology, Oregon Health & Science University, Portland, OR USA
| | - Detlev Boison
- Department of Neurosurgery, Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ USA
| | - Jeffrey J. Iliff
- Department of Anesthesiology and Perioperative Medicine, Oregon Health & Science University, Portland, OR USA
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA USA
- VISN 20 Mental Illness Research, Education and Clinical Center (MIRECC), VA Puget Sound Health Care System, 1660 S Columbian Wy., Seattle, WA 98108 USA
- Knight Cardiovascular Institute, Oregon Health & Science University, Portland, OR USA
- Department of Neurology, University of Washington School of Medicine, Seattle, WA USA
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Pati R, Palazzo C, Valente O, Abbrescia P, Messina R, Surdo NC, Lefkimmiatis K, Signorelli F, Nicchia GP, Frigeri A. The Readthrough Isoform AQP4ex Is Constitutively Phosphorylated in the Perivascular Astrocyte Endfeet of Human Brain. Biomolecules 2022; 12:633. [PMID: 35625560 PMCID: PMC9138620 DOI: 10.3390/biom12050633] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/17/2022] [Accepted: 04/22/2022] [Indexed: 02/03/2023] Open
Abstract
AQP4ex is a recently discovered isoform of AQP4 generated by a translational readthrough mechanism. It is strongly expressed at the astrocyte perivascular endfeet as a component of the supramolecular membrane complex, commonly called orthogonal array of particles (OAP), together with the canonical isoforms M1 and M23 of AQP4. Previous site-directed mutagenesis experiments suggested the potential role of serine331 and serine335, located in the extended peptide of AQP4ex, in water channel activity by phosphorylation. In the present study we evaluated the effective phosphorylation of human AQP4ex. A small scale bioinformatic analysis indicated that only Ser335 is conserved in human, mouse and rat AQP4ex. The phosphorylation site of Ser335 was assessed through generation of phospho-specific antibodies in rabbits. Antibody specificity was first evaluated in binding phosphorylated peptide versus its unphosphorylated analog by ELISA, which was further confirmed by site-directed mutagenesis experiments. Western blot and immunofluorescence experiments revealed strong expression of phosphorylated AQP4ex (p-AQP4ex) in human brain and localization at the perivascular astrocyte endfeet in supramolecular assemblies identified by BN/PAGE experiments. All together, these data reveal, for the first time, the existence of a phosphorylated form of AQP4, at Ser335 in the extended sequence exclusive of AQP4ex. Therefore, we anticipate an important physiological role of p-AQP4ex in human brain water homeostasis.
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Affiliation(s)
- Roberta Pati
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (R.P.); (C.P.); (O.V.); (P.A.); (R.M.); (F.S.)
| | - Claudia Palazzo
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (R.P.); (C.P.); (O.V.); (P.A.); (R.M.); (F.S.)
| | - Onofrio Valente
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (R.P.); (C.P.); (O.V.); (P.A.); (R.M.); (F.S.)
| | - Pasqua Abbrescia
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (R.P.); (C.P.); (O.V.); (P.A.); (R.M.); (F.S.)
| | - Raffaella Messina
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (R.P.); (C.P.); (O.V.); (P.A.); (R.M.); (F.S.)
| | - Nicoletta Concetta Surdo
- Foundation for Advanced Biomedical Research, Veneto Institute of Molecular Medicine, 35129 Padova, Italy; (N.C.S.); (K.L.)
- Neuroscience Institute, National Research Council of Italy (CNR), 35129 Padova, Italy
| | - Konstantinos Lefkimmiatis
- Foundation for Advanced Biomedical Research, Veneto Institute of Molecular Medicine, 35129 Padova, Italy; (N.C.S.); (K.L.)
- Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy
| | - Francesco Signorelli
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (R.P.); (C.P.); (O.V.); (P.A.); (R.M.); (F.S.)
| | - Grazia Paola Nicchia
- Department of Bioscience, Biotechnology and Biopharmaceutics, University of Bari Aldo Moro, 70124 Bari, Italy;
- Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, 840 Kennedy Center, Bronx, NY 10461, USA
| | - Antonio Frigeri
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy; (R.P.); (C.P.); (O.V.); (P.A.); (R.M.); (F.S.)
- Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, 840 Kennedy Center, Bronx, NY 10461, USA
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Zheng XY, Song WT, Zhang YH, Cao H, Liu JX. [Baicalin treats cerebral ischemia reperfusion-induced brain edema in rats by inhibiting TRPV4 and AQP4 of astrocytes]. Zhongguo Zhong Yao Za Zhi 2022; 47:1031-1038. [PMID: 35285204 DOI: 10.19540/j.cnki.cjcmm.20211116.701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This study aims to explore the pharmacodynamic effect of baicalin on rat brain edema induced by cerebral ischemia reperfusion injury and discuss the mechanism from the perspective of inhibiting astrocyte swelling, which is expected to serve as a refe-rence for the treatment of cerebral ischemia with Chinese medicine. To be specific, middle cerebral artery occlusion(suture method) was used to induce cerebral ischemia in rats. Rats were randomized into normal group, model group, high-dose baicalin(20 mg·kg~(-1)) group, and low-dose baicalin(10 mg·kg~(-1)) group. The neurobehavior, brain index, brain water content, and cerebral infarction area of rats were measured 6 h and 24 h after cerebral ischemia. Brain slices were stained with hematoxylin and eosin(HE) for the observation of pathological morphology of cerebral cortex after baicalin treatment. Enzyme-linked immunosorbent assay(ELISA) was employed to determine the content of total L-glutathione(GSH) and glutamic acid(Glu) in brain tissue, Western blot to measure the content of glial fibrillary acidic protein(GFAP), aquaporin-4(AQP4), and transient receptor potential vanilloid type 4(TRPV4), and immunohistochemical staining to observe the expression of GFAP. The low-dose baicalin was used for exploring the mechanism. The experimental results showed that the neurobehavioral scores(6 h and 24 h of cerebral ischemia), brain water content, and cerebral infarction area of the model group were increased, and both high-dose and low-dose baicalin can lower the above three indexes. The content of GSH dropped but the content of Glu raised in brain tissue of rats in the model group. Low-dose baicalin can elevate the content of GSH and lower the content of Glu. According to the immunohistochemical staining result, the model group demonstrated the increase in GFAP expression, and swelling and proliferation of astrocytes, and the low-dose baicalin can significantly improve this situation. The results of Western blot showed that the expression of GFAP, TRPV4, and AQP4 in the cerebral cortex of the model group increased, and the low-dose baicalin reduce their expression. The cerebral cortex of rats in the model group was severely damaged, and the low-dose baicalin can significantly alleviate the damage. The above results indicate that baicalin can effectively relieve the brain edema caused by cerebral ischemia reperfusion injury in rats, possibly by suppressing astrocyte swelling and TRPV4 and AQP4.
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Affiliation(s)
- Xiao-Yu Zheng
- Beijing University of Chinese Medicine Beijing 100029, China Beijing Key Laboratory of Pharmacology of Chinese Materia Medica, Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences Beijing 100091, China
| | - Wen-Ting Song
- Beijing Key Laboratory of Pharmacology of Chinese Materia Medica, Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences Beijing 100091, China
| | - Ye-Hao Zhang
- Beijing Key Laboratory of Pharmacology of Chinese Materia Medica, Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences Beijing 100091, China
| | - Hui Cao
- Beijing Key Laboratory of Pharmacology of Chinese Materia Medica, Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences Beijing 100091, China
| | - Jian-Xun Liu
- Beijing Key Laboratory of Pharmacology of Chinese Materia Medica, Institute of Basic Medical Sciences of Xiyuan Hospital, China Academy of Chinese Medical Sciences Beijing 100091, China
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Zhong Y, Liang B, Meng H, Ye R, Li Z, Du J, Wang B, Zhang B, Huang Y, Lin X, Hu M, Rong W, Wu Q, Yang X, Huang Z. 1,2-Dichloroethane induces cortex demyelination by depressing myelin basic protein via inhibiting aquaporin 4 in mice. Ecotoxicol Environ Saf 2022; 231:113180. [PMID: 35026584 DOI: 10.1016/j.ecoenv.2022.113180] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 12/22/2021] [Accepted: 01/06/2022] [Indexed: 06/14/2023]
Abstract
1,2-Dichloroethane (1,2-DCE) is a pervasive environmental pollutant, and overexposure to this hazardous material causes brain edema and demyelination in humans. We found that 1,2-DCE inhibits aquaporin 4 (AQP4) and is a primary pathogenic effector of 1,2-DCE-induced brain edema in animals. However, AQP4 down-regulation's link with cortex demyelination after 1,2-DCE exposure remains unclear. Thus, we exposed wild-type (WT) CD-1 mice and AQP4 knockout (AQP4-KO) mice to 0, 100, 350 and 700 mg/m3 1,2-DCE by inhalation for 28 days. We applied label-free proteomics and a cell co-culture system to elucidate the role of AQP4 inhibition in 1,2-DCE-induced demyelination. The results showed that 1,2-DCE down-regulated AQP4 in the WT mouse cortexes. Both 1,2-DCE exposure and AQP4 deletion induced neurotoxicity in mice, including increased brain water content, abnormal pathological vacuolations, and neurobehavioral damage. Tests for interaction of multiple regression analysis highlighted different effects of 1,2-DCE exposure level depending on the genotype, indicating the core role of AQP4 in regulation on 1,2-DCE-caused neurotoxicity. We used label-free quantitative proteomics to detect differentially expressed proteins associated with 1,2-DCE exposure and AQP4 inhibition, and identified down-regulation in myelin basic protein (MBP) and tyrosine-protein kinase Fyn (FYN) in a dose-dependent manner in WT mice but not in AQP4-KO mice. 1,2-DCE and AQP4 deletion separately resulted in demyelination, as detected by Luxol fast blue staining, and manifested as disordered nerve fibers and cavitation in the cortexes. Western blot and immunofluorescence confirmed the decreased AQP4 in the astrocytes and the down-regulated MBP in the oligodendrocytes by 1,2-DCE exposure and AQP4 inhibition, respectively. Finally, the co-culture results of SVG p12 and MO3.13 cells showed that 1,2-DCE-induced AQP4 down-regulation in the astrocytes was responsible for demyelination, by decreasing MBP in the oligodendrocytes. In conclusion, 1,2-DCE induced cortex demyelination by depressing MBP via AQP4 inhibition in the mice.
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Affiliation(s)
- Yizhou Zhong
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Boxuan Liang
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Hao Meng
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Rongyi Ye
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Zhiming Li
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Jiaxin Du
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Bo Wang
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Bingli Zhang
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Yuji Huang
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Xi Lin
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Manjiang Hu
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Weifeng Rong
- Department of Hygiene Monitor, Guangdong Provincial Hospital for Occupational Disease Prevention and Treatment, Guangzhou 510300, China
| | - Qinghong Wu
- Laboratory Animal Management Center, Southern Medical University, Guangzhou 510515, China
| | - Xingfen Yang
- Food Safety and Health Research Center, School of Public Health, Southern Medical University, Guangzhou 510515, China
| | - Zhenlie Huang
- NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Department of Toxicology, School of Public Health, Southern Medical University, Guangzhou 510515, China.
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Deffner F, Gleiser C, Mattheus U, Wagner A, Neckel PH, Fallier-Becker P, Hirt B, Mack AF. Aquaporin-4 expression in the human choroid plexus. Cell Mol Life Sci 2022; 79:90. [PMID: 35072772 PMCID: PMC8785037 DOI: 10.1007/s00018-022-04136-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 01/02/2022] [Accepted: 01/05/2022] [Indexed: 01/15/2023]
Abstract
The choroid plexus (CP) consists of specialized ependymal cells and underlying blood vessels and stroma producing the bulk of the cerebrospinal fluid (CSF). CP epithelial cells are considered the site of the internal blood-cerebrospinal fluid barrier, show epithelial characteristics (basal lamina, tight junctions), and express aquaporin-1 (AQP1) apically. In this study, we analyzed the expression of aquaporins in the human CP using immunofluorescence and qPCR. As previously reported, AQP1 was expressed apically in CP epithelial cells. Surprisingly, and previously unknown, many cells in the CP epithelium were also positive for aquaporin-4 (AQP4), normally restricted to ventricle-lining ependymal cells and astrocytes in the brain. Expression of AQP1 and AQP4 was found in the CP of all eight body donors investigated (3 males, 5 females; age 74–91). These results were confirmed by qPCR, and by electron microscopy detecting orthogonal arrays of particles. To find out whether AQP4 expression correlated with the expression pattern of relevant transport-related proteins we also investigated expression of NKCC1, and Na/K-ATPase. Immunostaining with NKCC1 was similar to AQP1 and revealed no particular pattern related to AQP4. Co-staining of AQP4 and Na/K-ATPase indicated a trend for an inverse correlation of their expression. We hypothesized that AQP4 expression in the CP was caused by age-related changes. To address this, we investigated mouse brains from young (2 months), adult (12 months) and old (30 months) mice. We found a significant increase of AQP4 on the mRNA level in old mice compared to young and adult animals. Taken together, we provide evidence for AQP4 expression in the CP of the aging brain which likely contributes to the water flow through the CP epithelium and CSF production. In two alternative hypotheses, we discuss this as a beneficial compensatory, or a detrimental mechanism influencing the previously observed CSF changes during aging.
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Affiliation(s)
- Felix Deffner
- Institute of Clinical Anatomy and Cell Analysis, University of Tübingen, Österbergstr. 3, 72074, Tübingen, Germany
| | - Corinna Gleiser
- Institute of Clinical Anatomy and Cell Analysis, University of Tübingen, Österbergstr. 3, 72074, Tübingen, Germany
| | - Ulrich Mattheus
- Institute of Clinical Anatomy and Cell Analysis, University of Tübingen, Österbergstr. 3, 72074, Tübingen, Germany
| | - Andreas Wagner
- Institute of Clinical Anatomy and Cell Analysis, University of Tübingen, Österbergstr. 3, 72074, Tübingen, Germany
| | - Peter H Neckel
- Institute of Clinical Anatomy and Cell Analysis, University of Tübingen, Österbergstr. 3, 72074, Tübingen, Germany
| | - Petra Fallier-Becker
- Institute of Pathology and Neuropathology, University of Tübingen, Tübingen, Germany
| | - Bernhard Hirt
- Institute of Clinical Anatomy and Cell Analysis, University of Tübingen, Österbergstr. 3, 72074, Tübingen, Germany
| | - Andreas F Mack
- Institute of Clinical Anatomy and Cell Analysis, University of Tübingen, Österbergstr. 3, 72074, Tübingen, Germany.
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Cibelli A, Stout R, Timmermann A, de Menezes L, Guo P, Maass K, Seifert G, Steinhäuser C, Spray DC, Scemes E. Cx43 carboxyl terminal domain determines AQP4 and Cx30 endfoot organization and blood brain barrier permeability. Sci Rep 2021; 11:24334. [PMID: 34934080 PMCID: PMC8692511 DOI: 10.1038/s41598-021-03694-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 12/06/2021] [Indexed: 11/08/2022] Open
Abstract
The neurovascular unit (NVU) consists of cells intrinsic to the vessel wall, the endothelial cells and pericytes, and astrocyte endfeet that surround the vessel but are separated from it by basement membrane. Endothelial cells are primarily responsible for creating and maintaining blood-brain-barrier (BBB) tightness, but astrocytes contribute to the barrier through paracrine signaling to the endothelial cells and by forming the glia limitans. Gap junctions (GJs) between astrocyte endfeet are composed of connexin 43 (Cx43) and Cx30, which form plaques between cells. GJ plaques formed of Cx43 do not diffuse laterally in the plasma membrane and thus potentially provide stable organizational features to the endfoot domain, whereas GJ plaques formed of other connexins and of Cx43 lacking a large portion of its cytoplasmic carboxyl terminus are quite mobile. In order to examine the organizational features that immobile GJs impose on the endfoot, we have used super-resolution confocal microscopy to map number and sizes of GJ plaques and aquaporin (AQP)-4 channel clusters in the perivascular endfeet of mice in which astrocyte GJs (Cx30, Cx43) were deleted or the carboxyl terminus of Cx43 was truncated. To determine if BBB integrity was compromised in these transgenic mice, we conducted perfusion studies under elevated hydrostatic pressure using horseradish peroxide as a molecular probe enabling detection of micro-hemorrhages in brain sections. These studies revealed that microhemorrhages were more numerous in mice lacking Cx43 or its carboxyl terminus. In perivascular domains of cerebral vessels, we found that density of Cx43 GJs was higher in the truncation mutant, while GJ size was smaller. Density of perivascular particles formed by AQP4 and its extended isoform AQP4ex was inversely related to the presence of full length Cx43, whereas the ratio of sizes of the particles of the AQP4ex isoform to total AQP4 was directly related to the presence of full length Cx43. Confocal analysis showed that Cx43 and Cx30 were substantially colocalized in astrocyte domains near vasculature of truncation mutant mice. These results showing altered distribution of some astrocyte nexus components (AQP4 and Cx30) in Cx43 null mice and in a truncation mutant, together with leakier cerebral vasculature, support the hypothesis that localization and mobility of gap junction proteins and their binding partners influences organization of astrocyte endfeet which in turn impacts BBB integrity of the NVU.
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Affiliation(s)
- Antonio Cibelli
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Randy Stout
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
- New York Institute of Technology College of Osteopathic Medicine, Old Westbury, NY, USA
| | - Aline Timmermann
- Institute of Cellular Neurosciences, Medical Faculty, University of Bonn, Bonn, Germany
| | - Laura de Menezes
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY, USA
- Insitute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Peng Guo
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY, USA
- Cellular Imaging Core Facility, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Karen Maass
- Cardiovascular Research Center, NYU Grossman School of Medicine, New York, NY, USA
| | - Gerald Seifert
- Institute of Cellular Neurosciences, Medical Faculty, University of Bonn, Bonn, Germany
| | - Christian Steinhäuser
- Institute of Cellular Neurosciences, Medical Faculty, University of Bonn, Bonn, Germany
| | - David C Spray
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY, 10461, USA.
- Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY, USA.
| | - Eliana Scemes
- Department of Anatomy and Cell Biology, New York Medical College, Valhalla, NY, 10595, USA.
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Tan C, Zeng J, Wu G, Zheng L, Huang M, Huang X. Xinshuitong Capsule extract attenuates doxorubicin-induced myocardial edema via regulation of cardiac aquaporins in the chronic heart failure rats. Biomed Pharmacother 2021; 144:112261. [PMID: 34628163 DOI: 10.1016/j.biopha.2021.112261] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 09/23/2021] [Accepted: 09/26/2021] [Indexed: 02/05/2023] Open
Abstract
Doxorubicin (Dox), an effective antineoplastic drug, was limited use for cardiotoxicity. Xinshuitong Capsule (XST), a patented herbal formula, showed desirable beneficial effects in the treatment of chronic heart failure (CHF) patients. However, the drug on Dox-induced cardiotoxicity remains unclear. Ninety male Sprague-Dawley rats were randomized into two groups: 15 rats were selected as the normal group and 75 rats were injected intraperitoneally with Dox to establish CHF rat models, the success ones were randomly divided into five groups: low XST (LXST), medium XST (MXST) or high XST (HXST) (4.9, 9.8, or 19.6 g/kg d) administrated intragastrically twice a day for 4 weeks, with the captopril-treated group and the model group as comparison. The model group showed the cardiac functions generally impaired, and CHF mortality rate higher (47%) than those in the XST-treated groups (averaged 24%, P < 0.05). Compared with XST-treated groups, myocardial remodeling, inflammation and desarcomerization, and higher water content more severe in the cardiac tissue in the model group (P < 0.05), which was associated with higher expressions of mRNA or protein levels of AQP1, 4 and 7. Dox-impaired cardiac functions, cardiac remodeling and myocardial edema could be dose-dependently reverted by XST treatment. XST could inhibit AQP1, 4 and 7 at mRNA levels or at protein levels, which was associated with the attenuation of myocardial edema and cardiac remodeling, decreasing the ventricular stiffness and improving the cardiac functions and rats' survival. AQPs is involved in cardiac edema composed one of the mechanisms of Dox-induced cardiotoxicity, XSTvia inhibition of AQPs relieved the Dox-induced side effects.
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MESH Headings
- Administration, Oral
- Animals
- Aquaporin 1/antagonists & inhibitors
- Aquaporin 1/genetics
- Aquaporin 1/metabolism
- Aquaporin 4/antagonists & inhibitors
- Aquaporin 4/genetics
- Aquaporin 4/metabolism
- Aquaporins/antagonists & inhibitors
- Aquaporins/genetics
- Aquaporins/metabolism
- Body Water/metabolism
- Capsules
- Cardiotoxicity
- Chronic Disease
- Disease Models, Animal
- Doxorubicin
- Drugs, Chinese Herbal/administration & dosage
- Drugs, Chinese Herbal/pharmacology
- Edema, Cardiac/chemically induced
- Edema, Cardiac/metabolism
- Edema, Cardiac/pathology
- Edema, Cardiac/prevention & control
- Heart Failure/chemically induced
- Heart Failure/metabolism
- Heart Failure/pathology
- Heart Failure/prevention & control
- Male
- Myocardium/metabolism
- Myocardium/pathology
- Rats, Sprague-Dawley
- Signal Transduction
- Ventricular Function, Left/drug effects
- Ventricular Remodeling/drug effects
- Rats
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Affiliation(s)
- Chunjiang Tan
- Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, China; The Third People's Hospital affiliated to Fujian University of Chinese Medicine, Fuzhou, Fujian, China; Fujian Academy of Integrative Medicine, Fuzhou, Fujian, China; Fujian Provincial Key Laboratory of Integrative Medicine on Geriatrics, Fuzhou, Fujian, China.
| | - Jianwei Zeng
- Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, China; Fujian Academy of Integrative Medicine, Fuzhou, Fujian, China; Fujian Provincial Key Laboratory of Integrative Medicine on Geriatrics, Fuzhou, Fujian, China.
| | - Guangwen Wu
- Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, China; Fujian Academy of Integrative Medicine, Fuzhou, Fujian, China; Fujian Provincial Key Laboratory of Integrative Medicine on Geriatrics, Fuzhou, Fujian, China.
| | - Liangpu Zheng
- Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, China; Fujian Academy of Integrative Medicine, Fuzhou, Fujian, China; Fujian Provincial Key Laboratory of Integrative Medicine on Geriatrics, Fuzhou, Fujian, China.
| | - Meiya Huang
- Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian, China; Fujian Academy of Integrative Medicine, Fuzhou, Fujian, China; Fujian Provincial Key Laboratory of Integrative Medicine on Geriatrics, Fuzhou, Fujian, China.
| | - Xiansheng Huang
- Department of Cardiology, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China.
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Trillo-Contreras JL, Toledo-Aral JJ, Villadiego J, Echevarría M. Aquaporin-4 Mediates Permanent Brain Alterations in a Mouse Model of Hypoxia-Aged Hydrocephalus. Int J Mol Sci 2021; 22:ijms22189745. [PMID: 34575909 PMCID: PMC8471142 DOI: 10.3390/ijms22189745] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/06/2021] [Accepted: 09/07/2021] [Indexed: 11/29/2022] Open
Abstract
Aquaporin-4 (AQP4) is the principal water channel in the brain being expressed in astrocytes and ependymal cells. AQP4 plays an important role in cerebrospinal fluid (CSF) homeostasis, and alterations in its expression have been associated with hydrocephalus. AQP4 contributes to the development of hydrocephalus by hypoxia in aged mice, reproducing such principal characteristics of the disease. Here, we explore whether these alterations associated with the hydrocephalic state are permanent or can be reverted by reexposure to normoxia. Alterations such as ventriculomegaly, elevated intracranial pressure, and cognitive deficits were reversed, whereas deficits in CSF outflow and ventricular distensibility were not recovered, remaining impaired even one month after reestablishment of normoxia. Interestingly, in AQP4−/− mice, the impairment in CSF drainage and ventricular distensibility was completely reverted by re-normoxia, indicating that AQP4 has a structural role in the chronification of those alterations. Finally, we show that aged mice subjected to two hypoxic episodes experience permanent ventriculomegaly. These data reveal that repetitive hypoxic events in aged cerebral tissue promote the permanent alterations involved in hydrocephalic pathophysiology, which are dependent on AQP4 expression.
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Affiliation(s)
- José Luis Trillo-Contreras
- Institute of Biomedicine of Seville-IBiS, University Hospital Virgen del Rocío, CSIC, University of Seville, 41013 Seville, Spain; (J.L.T.-C.); (J.J.T.-A.)
- Department of Medical Physiology and Biophysics, University of Seville, 41009 Seville, Spain
| | - Juan José Toledo-Aral
- Institute of Biomedicine of Seville-IBiS, University Hospital Virgen del Rocío, CSIC, University of Seville, 41013 Seville, Spain; (J.L.T.-C.); (J.J.T.-A.)
- Department of Medical Physiology and Biophysics, University of Seville, 41009 Seville, Spain
- Network Center for Biomedical Research in Neurodegenerative Diseases (CIBERNED), 28031 Madrid, Spain
| | - Javier Villadiego
- Institute of Biomedicine of Seville-IBiS, University Hospital Virgen del Rocío, CSIC, University of Seville, 41013 Seville, Spain; (J.L.T.-C.); (J.J.T.-A.)
- Department of Medical Physiology and Biophysics, University of Seville, 41009 Seville, Spain
- Network Center for Biomedical Research in Neurodegenerative Diseases (CIBERNED), 28031 Madrid, Spain
- Correspondence: (J.V.); (M.E.); Tel.: +34-955-920-034 (J.V.); +34-955-920-036 (M.E.)
| | - Miriam Echevarría
- Institute of Biomedicine of Seville-IBiS, University Hospital Virgen del Rocío, CSIC, University of Seville, 41013 Seville, Spain; (J.L.T.-C.); (J.J.T.-A.)
- Department of Medical Physiology and Biophysics, University of Seville, 41009 Seville, Spain
- Correspondence: (J.V.); (M.E.); Tel.: +34-955-920-034 (J.V.); +34-955-920-036 (M.E.)
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Koike S, Tanaka Y, Morishita Y, Ishibashi K. Effects of osmolality on the expression of brain aquaporins in AQP11-null mice. Biochimie 2021; 188:2-6. [PMID: 33794341 DOI: 10.1016/j.biochi.2021.03.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 03/22/2021] [Accepted: 03/23/2021] [Indexed: 10/21/2022]
Abstract
Water transport in the brain is tightly controlled by blood-brain-barrier (BBB) composed of capillary endothelial cells expressing AQP1/AQP11 and glial foot processes expressing AQP4. Here we examined each AQP mRNA expression in acute hyponatremic and hypernatremic mouse models of wild type (WT) and AQP11 KO mice (KO). The expressions of AQP1, AQP4 and AQP11 mRNAs were quantified by real-time qRT-PCR analysis of whole brain RNA. Acute hyponatremia enhanced AQP4 expression without changing AQP1 expression in KO, whereas it did not change the expression of all AQPs in WT. On the other hand, acute hypernatremia increased AQP4 but decreased AQP1 expression by half in KO, whereas it decreased AQP1 and AQP11 by half without changing AQP4 expression in WT. Enhanced AQP4 expression by osmotic challenges with sodium in KO seems to be a compensation for the loss of AQP11. A stronger hypertonic stimulation with mannitol decreased all AQPs by 30-80% in WT. Since AQP4 plays an important role in the regulation of brain edema at BBB, the results suggest that AQP11 may also be involved in the osmotic regulation of the brain.
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Affiliation(s)
- Shin Koike
- Department of Analytical Chemistry, School of Pharmacy, Meiji Pharmaceutical University, Tokyo, Japan
| | - Yasuko Tanaka
- Department of Pathophysiology, School of Pharmacy, Meiji Pharmaceutical University, Tokyo, Japan
| | - Yoshiyuki Morishita
- Division of Nephrology, First Department of Integrated Medicine, Saitama Medical Center, Jichi Medical University, Saitama, Japan
| | - Kenichi Ishibashi
- Department of Pathophysiology, School of Pharmacy, Meiji Pharmaceutical University, Tokyo, Japan.
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Zhu Z, He Y, Liu Z, Zhang W, Kang Q, Lin Y, Qiu J, Zhang Y, Xu P, Zhu X. A hydrogen sulfide donor suppresses pentylenetetrazol-induced seizures in rats via PKC signaling. Eur J Pharmacol 2021; 898:173959. [PMID: 33617826 DOI: 10.1016/j.ejphar.2021.173959] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 02/06/2021] [Accepted: 02/15/2021] [Indexed: 12/18/2022]
Abstract
Epilepsy is a serious neurological disorder. Available antiepileptic drugs are still lacking. Hydrogen sulfide (H2S), a neuron-protective endogenous gasotransmitter, is reported to have effect on epilepsy. But it remains to be determined for its mechanism. In the present study, we found that a novel carbazole-based H2S donor could effectively suppress pentylenetetrazol-induced seizures in rats. The H2S donor could alleviate not only the epileptic behavior of animals but also the hippocampal EEG activity of seizures. The H2S donor down-regulated the expression of aquaporin 4 in the hippocampus of epilepsy rats. The H2S donor also decreased the seizure-induced release of inflammatory cytokines including IL-1β, IL-6 and TNF-α. In addition, the H2S donor increased protein kinase C (PKC) expression in the hippocampus of epilepsy rats. These effects of the H2S donor on epilepsy rats were attenuated after blockade of PKC signaling by Go6983, suggesting that PKC signaling participated in the antiepileptic process of H2S donor. Taken together, the H2S donor has a beneficial effect on epilepsy control in a PKC-dependent manner.
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Affiliation(s)
- Ziting Zhu
- Dept. of Physiology, Key Laboratory of Neuroscience, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, 511436, China; Dept. of Neurology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510120, China
| | - Yan He
- Dept. of Physiology, Key Laboratory of Neuroscience, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, 511436, China
| | - Zhongrui Liu
- Dept. of Physiology, Key Laboratory of Neuroscience, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, 511436, China
| | - Wenlong Zhang
- Dept. of Neurology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510120, China
| | - Qiyun Kang
- Dept. of Physiology, Key Laboratory of Neuroscience, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, 511436, China
| | - Yuwan Lin
- Dept. of Physiology, Key Laboratory of Neuroscience, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, 511436, China; Dept. of Neurology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510120, China
| | - Jiewen Qiu
- Dept. of Physiology, Key Laboratory of Neuroscience, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, 511436, China; Dept. of Neurology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510120, China
| | - Yilong Zhang
- Dept. of Physiology, Key Laboratory of Neuroscience, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, 511436, China
| | - Pingyi Xu
- Dept. of Physiology, Key Laboratory of Neuroscience, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, 511436, China; Dept. of Neurology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510120, China.
| | - Xiaoqin Zhu
- Dept. of Physiology, Key Laboratory of Neuroscience, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou, 511436, China.
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Patabendige A, Singh A, Jenkins S, Sen J, Chen R. Astrocyte Activation in Neurovascular Damage and Repair Following Ischaemic Stroke. Int J Mol Sci 2021; 22:4280. [PMID: 33924191 PMCID: PMC8074612 DOI: 10.3390/ijms22084280] [Citation(s) in RCA: 70] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 04/11/2021] [Accepted: 04/15/2021] [Indexed: 12/11/2022] Open
Abstract
Transient or permanent loss of tissue perfusion due to ischaemic stroke can lead to damage to the neurovasculature, and disrupt brain homeostasis, causing long-term motor and cognitive deficits. Despite promising pre-clinical studies, clinically approved neuroprotective therapies are lacking. Most studies have focused on neurons while ignoring the important roles of other cells of the neurovascular unit, such as astrocytes and pericytes. Astrocytes are important for the development and maintenance of the blood-brain barrier, brain homeostasis, structural support, control of cerebral blood flow and secretion of neuroprotective factors. Emerging data suggest that astrocyte activation exerts both beneficial and detrimental effects following ischaemic stroke. Activated astrocytes provide neuroprotection and contribute to neurorestoration, but also secrete inflammatory modulators, leading to aggravation of the ischaemic lesion. Astrocytes are more resistant than other cell types to stroke pathology, and exert a regulative effect in response to ischaemia. These roles of astrocytes following ischaemic stroke remain incompletely understood, though they represent an appealing target for neurovascular protection following stroke. In this review, we summarise the astrocytic contributions to neurovascular damage and repair following ischaemic stroke, and explore mechanisms of neuroprotection that promote revascularisation and neurorestoration, which may be targeted for developing novel therapies for ischaemic stroke.
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Affiliation(s)
- Adjanie Patabendige
- Brain Barriers Group, School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW 2321, Australia;
- Priority Research Centre for Stroke and Brain Injury, and Priority Research Centre for Brain & Mental Health, University of Newcastle, Callaghan, NSW 2321, Australia
- Hunter Medical Research Institute, New Lambton Heights, NSW 2305, Australia
- Institute of Infection & Global Health, University of Liverpool, Liverpool L7 3EA, UK
| | - Ayesha Singh
- School of Pharmacy and Bioengineering, Keele University, Staffordshire ST5 5BG, UK;
| | - Stuart Jenkins
- School of Medicine, Keele University, Staffordshire ST5 5BG, UK; (S.J.); (J.S.)
- Neural Tissue Engineering: Keele (NTEK), Keele University, Staffordshire ST5 5BG, UK
| | - Jon Sen
- School of Medicine, Keele University, Staffordshire ST5 5BG, UK; (S.J.); (J.S.)
- Clinical Informatics and Neurosurgery Fellow, The Cleveland Clinic, 33 Grosvenor Square, London SW1X 7HY, UK
| | - Ruoli Chen
- School of Pharmacy and Bioengineering, Keele University, Staffordshire ST5 5BG, UK;
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