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Zou K, Deng Q, Zhang H, Huang C. Glymphatic system: a gateway for neuroinflammation. Neural Regen Res 2024; 19:2661-2672. [PMID: 38595285 PMCID: PMC11168510 DOI: 10.4103/1673-5374.391312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 09/15/2023] [Accepted: 11/09/2023] [Indexed: 04/11/2024] Open
Abstract
The glymphatic system is a relatively recently identified fluid exchange and transport system in the brain. Accumulating evidence indicates that glymphatic function is impaired not only in central nervous system disorders but also in systemic diseases. Systemic diseases can trigger the inflammatory responses in the central nervous system, occasionally leading to sustained inflammation and functional disturbance of the central nervous system. This review summarizes the current knowledge on the association between glymphatic dysfunction and central nervous system inflammation. In addition, we discuss the hypothesis that disease conditions initially associated with peripheral inflammation overwhelm the performance of the glymphatic system, thereby triggering central nervous system dysfunction, chronic neuroinflammation, and neurodegeneration. Future research investigating the role of the glymphatic system in neuroinflammation may offer innovative therapeutic approaches for central nervous system disorders.
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Affiliation(s)
- Kailu Zou
- Department of Anesthesiology, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Qingwei Deng
- Department of Anesthesiology, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
| | - Hong Zhang
- Xiangya School of Medicine, Central South University, Changsha, Hunan Province, China
| | - Changsheng Huang
- Department of Anesthesiology, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan Province, China
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2
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Chen YL, Wang Y, Fang QY, Wang T, Chen C, Gao TY, Wu M, Zhang WP, Lu YB. PARP-1 inhibitor alleviates cerebral ischemia/reperfusion injury by reducing PARylation of HK-1 and LDH in mice. Eur J Pharmacol 2024; 967:176377. [PMID: 38346469 DOI: 10.1016/j.ejphar.2024.176377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 01/06/2024] [Accepted: 01/31/2024] [Indexed: 02/18/2024]
Abstract
Poly (ADP-ribose) polymerase-1 (PARP-1) activity significantly increases during cerebral ischemia/reperfusion. PARP-1 is an NAD+-consumption enzyme. PARP-1 hyperactivity causes intracellular NAD+ deficiency and bioenergetic collapse, contributing to neuronal death. Besides, the powerful trigger of PARP-1 causes the catalyzation of poly (ADP-ribosyl)ation (PARylation), a posttranslational modification of proteins. Here, we found that PARP-1 was activated in the ischemic brain tissue during middle-cerebral-artery occlusion and reperfusion (MCAO/R) for 24 h, and PAR accumulated in the neurons in mice. Using immunoprecipitation, Western blotting, liquid chromatography-mass spectrometry, and 3D-modeling analysis, we revealed that the activation of PARP-1 caused PARylation of hexokinase-1 and lactate dehydrogenase-B, which, therefore, caused the inhibition of these enzyme activities and the resulting cell energy metabolism collapse. PARP-1 inhibition significantly reversed the activity of hexokinase and lactate dehydrogenase, decreased infarct volume, and improved neuronal deficiency. PARP-1 inhibitor combined with pyruvate further alleviated MCAO/R-induced ischemic brain injury in mice. As such, we conclude that PARP-1 inhibitor alleviates neuronal death partly by inhibiting the PARylation of metabolic-related enzymes and reversing metabolism reprogramming during cerebral ischemia/reperfusion injury in mice. PARP-1 inhibitor combined with pyruvate might be a promising therapeutic approach against brain ischemia/reperfusion injury.
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Affiliation(s)
- Ya-Ling Chen
- Department of Pharmacology, School of Basic Medical Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Yi Wang
- Department of Pharmacology, School of Basic Medical Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Qiu-Yu Fang
- Department of Pharmacology, School of Basic Medical Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Department of Thoracic Surgery, The Second Affiliated Hospital of School of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310009, China
| | - Tong Wang
- Department of Pharmacology, School of Basic Medical Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Cong Chen
- Department of Pharmacology, School of Basic Medical Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Tong-Yao Gao
- Department of Pharmacology, School of Basic Medical Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Ming Wu
- Department of Thoracic Surgery, The Second Affiliated Hospital of School of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310009, China
| | - Wei-Ping Zhang
- Department of Pharmacology, School of Basic Medical Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
| | - Yun-Bi Lu
- Department of Pharmacology, School of Basic Medical Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
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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] [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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Urushihata T, Takuwa H, Takahashi M, Kershaw J, Tachibana Y, Nitta N, Shibata S, Yasui M, Higuchi M, Obata T. Exploring cell membrane water exchange in aquaporin-4-deficient ischemic mouse brain using diffusion-weighted MRI. Eur Radiol Exp 2021; 5:44. [PMID: 34617156 PMCID: PMC8494869 DOI: 10.1186/s41747-021-00244-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 08/27/2021] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Aquaporin-4 is a membrane channel protein that is highly expressed in brain astrocytes and facilitates the transport of water molecules. It has been suggested that suppression of aquaporin-4 function may be an effective treatment for reducing cellular edema after cerebral infarction. It is therefore important to develop clinically applicable measurement systems to evaluate and better understand the effects of aquaporin-4 suppression on the living body. METHODS Animal models of focal cerebral ischemia were created by surgically occluding the middle cerebral artery of wild-type and aquaporin-4 knockout mice, after which multi-b-value multi-diffusion-time diffusion-weighted imaging measurements were performed. Data were analyzed with both the apparent diffusion coefficient (ADC) model and a compartmental water-exchange model. RESULTS ADCs were estimated for five different b value ranges. The ADC of aquaporin-4 knockout mice in the contralateral region was significantly higher than that of wild-type mice for each range. In contrast, aquaporin-4 knockout mice had significantly lower ADC than wild-type mice in ischemic tissue for each b-value range. Genotype-dependent differences in the ADC were particularly significant for the lowest ranges in normal tissue and for the highest ranges in ischemic tissue. The ADCs measured at different diffusion times were significantly different for both genotypes. Fitting of the water-exchange model to the ischemic region data found that the water-exchange time in aquaporin-4 knockout mice was approximately 2.5 times longer than that in wild-type mice. CONCLUSIONS Multi-b-value multi-diffusion-time diffusion-weighted imaging may be useful for in vivo research and clinical diagnosis of aquaporin-4-related diseases.
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Affiliation(s)
- Takuya Urushihata
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, QST, Chiba, 263-8555, Japan
| | - Hiroyuki Takuwa
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, QST, Chiba, 263-8555, Japan
| | - Manami Takahashi
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, QST, Chiba, 263-8555, Japan
| | - Jeff Kershaw
- Applied MRI Research, Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, QST, Chiba, 263-8555, Japan
| | - Yasuhiko Tachibana
- Applied MRI Research, Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, QST, Chiba, 263-8555, Japan
| | - Nobuhiro Nitta
- Applied MRI Research, Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, QST, Chiba, 263-8555, Japan
| | - Sayaka Shibata
- Applied MRI Research, Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, QST, Chiba, 263-8555, Japan
| | - Masato Yasui
- Keio Advanced Research Center for Water Biology and Medicine, Keio University, Tokyo, 160-0016, Japan
| | - Makoto Higuchi
- Department of Functional Brain Imaging Research, Institute for Quantum Medical Science, QST, Chiba, 263-8555, Japan
| | - Takayuki Obata
- Applied MRI Research, Department of Molecular Imaging and Theranostics, Institute for Quantum Medical Science, QST, Chiba, 263-8555, Japan.
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Dadgostar E, Tajiknia V, Shamsaki N, Naderi-Taheri M, Aschner M, Mirzaei H, Tamtaji OR. Aquaporin 4 and brain-related disorders: Insights into its apoptosis roles. EXCLI JOURNAL 2021; 20:983-994. [PMID: 34267610 PMCID: PMC8278210 DOI: 10.17179/excli2021-3735] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 05/17/2021] [Indexed: 12/11/2022]
Abstract
Brain-related disorders are leading global health problems. Various internal and external factors are involved in the progression of brain-related disorders. Inflammatory pathways, oxidative stresses, apoptosis, and deregulations of various channels are critical players in brain-related disorder pathogenesis. Among these players, aquaporins (AQP) have critical roles in various physiological and pathological conditions. AQPs are water channel molecules that permit water to cross the hydrophobic lipid bilayers of cellular membranes. AQP4 is one of the important members of AQP family. AQPs are involved in controlling apoptosis pathways in brain-related disorders. In this regard, several reports have evaluated the pathological effects of AQP4 by targeting the apoptosis-related processes in brain-related disorders. Here, for the first time, we highlight the impact of AQP4 on apoptosis-related processes in brain-related disorders.
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Affiliation(s)
- Ehsan Dadgostar
- Department of Psychiatry, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
- Student Research Committee, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Vida Tajiknia
- Department of Surgery, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Negar Shamsaki
- Psychiatry and Behavioral Sciences Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mojtaba Naderi-Taheri
- Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, 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, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran
| | - Omid Reza Tamtaji
- Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran
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Drug development in targeting ion channels for brain edema. Acta Pharmacol Sin 2020; 41:1272-1288. [PMID: 32855530 PMCID: PMC7609292 DOI: 10.1038/s41401-020-00503-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 08/02/2020] [Indexed: 12/18/2022] Open
Abstract
Cerebral edema is a pathological hallmark of various central nervous system (CNS) insults, including traumatic brain injury (TBI) and excitotoxic injury such as stroke. Due to the rigidity of the skull, edema-induced increase of intracranial fluid significantly complicates severe CNS injuries by raising intracranial pressure and compromising perfusion. Mortality due to cerebral edema is high. With mortality rates up to 80% in severe cases of stroke, it is the leading cause of death within the first week. Similarly, cerebral edema is devastating for patients of TBI, accounting for up to 50% mortality. Currently, the available treatments for cerebral edema include hypothermia, osmotherapy, and surgery. However, these treatments only address the symptoms and often elicit adverse side effects, potentially in part due to non-specificity. There is an urgent need to identify effective pharmacological treatments for cerebral edema. Currently, ion channels represent the third-largest target class for drug development, but their roles in cerebral edema remain ill-defined. The present review aims to provide an overview of the proposed roles of ion channels and transporters (including aquaporins, SUR1-TRPM4, chloride channels, glucose transporters, and proton-sensitive channels) in mediating cerebral edema in acute ischemic stroke and TBI. We also focus on the pharmacological inhibitors for each target and potential therapeutic strategies that may be further pursued for the treatment of cerebral edema.
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Abe Y, Ikegawa N, Yoshida K, Muramatsu K, Hattori S, Kawai K, Murakami M, Tanaka T, Goda W, Goto M, Yamamoto T, Hashimoto T, Yamada K, Shibata T, Misawa H, Mimura M, Tanaka KF, Miyakawa T, Iwatsubo T, Hata JI, Niikura T, Yasui M. Behavioral and electrophysiological evidence for a neuroprotective role of aquaporin-4 in the 5xFAD transgenic mice model. Acta Neuropathol Commun 2020; 8:67. [PMID: 32398151 PMCID: PMC7218576 DOI: 10.1186/s40478-020-00936-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 04/21/2020] [Indexed: 12/19/2022] Open
Abstract
Aquaporin-4 (AQP4) has been suggested to be involved in the pathogenesis of neurodegenerative diseases including Alzheimer's disease (AD), which may be due to the modulation of neuroinflammation or the impairment of interstitial fluid bulk flow system in the central nervous system. Here, we show an age-dependent impairment of several behavioral outcomes in 5xFAD AQP4 null mice. Twenty-four-hour video recordings and computational analyses of their movement revealed that the nighttime motion of AQP4-deficient 5xFAD mice was progressively reduced between 20 and 36 weeks of age, with a sharp deterioration occurring between 30 and 32 weeks. This reduction in nighttime motion was accompanied by motor dysfunction and epileptiform neuronal activities, demonstrated by increased abnormal spikes by electroencephalography. In addition, all AQP4-deficient 5xFAD mice exhibited convulsions at least once during the period of the analysis. Interestingly, despite such obvious phenotypes, parenchymal amyloid β (Aβ) deposition, reactive astrocytosis, and activated microgliosis surrounding amyloid plaques were unchanged in the AQP4-deficient 5xFAD mice relative to 5xFAD mice. Taken together, our data indicate that AQP4 deficiency greatly accelerates an age-dependent deterioration of neuronal function in 5xFAD mice associated with epileptiform neuronal activity without significantly altering Aβ deposition or neuroinflammation in this mouse model. We therefore propose that there exists another pathophysiological phase in AD which follows amyloid plaque deposition and neuroinflammation and is sensitive to AQP4 deficiency.
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Circulating Aquaporin-4 as A biomarker of early neurological improvement in stroke patients: A pilot study. Neurosci Lett 2019; 714:134580. [PMID: 31672489 DOI: 10.1016/j.neulet.2019.134580] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 10/17/2019] [Accepted: 10/22/2019] [Indexed: 11/21/2022]
Abstract
Patients' outcome prediction after ischemic stroke is still challenging. Aquaporin-4 (AQP4) is a water channel that is up-regulated in the brain after the ischemic event, but its presence in bloodstream of stroke patients has not been previously studied. The aim of this pilot study was to investigate circulating AQP4 levels after stroke and its correlation with infarct growth and neurological outcome. AQP4 level was determined by ELISA in serum from 42 t-PA-treated ischemic stroke patients at admission (before t-PA) and 13 healthy subjects. To assess infarct growth, serial brain diffusion-weighted magnetic resonance images were performed at hospital admission and 1-3 days after. Neurological improvement was defined as a ≥4-point decrease in NIHSS score compared to baseline score. Despite stroke patients and healthy controls had similar baseline circulating AQP4 levels, among strokes AQP4 level negatively correlated with NIHSS score at admission (R= -0.34, p = 0.029) and with infarct growth after 1-3 days of stroke onset (R=-0.36; p = 0.018). Furthermore, baseline AQP4 level was higher in those stroke patients showing a neurological improvement 48 h after stroke onset (p = 0.030) and at hospital discharge (p = 0.037). Baseline AQP4 levels also resulted to be an independent predictor of good neurological outcome at both studied time points (ORadj: 14.33[1.82-112.92], p = 0.012 at 48 h; ORadj: 4.86[0.98-24.12], p = 0.053 at discharge) in logistic regression analysis, adjusted by age, sex, baseline NIHSS and significant variables in the univariate analysis. Overall, we have explored circulating AQP4 levels, and our data suggest that AQP4 could be used as a biomarker of neurological recovery in the acute-subacute phase of ischemic stroke.
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Glober NK, Sprague S, Ahmad S, Mayfield KG, Fletcher LM, Digicaylioglu MH, Sayre NL. Acetazolamide Treatment Prevents Redistribution of Astrocyte Aquaporin 4 after Murine Traumatic Brain Injury. NEUROSCIENCE JOURNAL 2019; 2019:2831501. [PMID: 31187032 PMCID: PMC6521570 DOI: 10.1155/2019/2831501] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 03/14/2019] [Accepted: 03/27/2019] [Indexed: 01/18/2023]
Abstract
After traumatic brain injury (TBI), multiple ongoing processes contribute to worsening and spreading of the primary injury to create a secondary injury. One major process involves disrupted fluid regulation to create vascular and cytotoxic edema in the affected area. Although understanding of factors that influence edema is incomplete, the astrocyte water channel Aquaporin 4 (AQP4) has been identified as an important mediator and therefore attractive drug target for edema prevention. The FDA-approved drug acetazolamide has been administered safely to patients for years in the United States. To test whether acetazolamide altered AQP4 function after TBI, we utilized in vitro and in vivo models of TBI. Our results suggest that AQP4 localization is altered after TBI, similar to previously published reports. Treatment with acetazolamide prevented AQP4 reorganization, both in human astrocyte in vitro and in mice in vivo. Moreover, acetazolamide eliminated cytotoxic edema in our in vivo mouse TBI model. Our results suggest a possible clinical role for acetazolamide in the treatment of TBI.
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Affiliation(s)
- Nancy K. Glober
- Department of Emergency Medicine, Stanford University, Palo Alto, California, USA
| | - Shane Sprague
- Department of Neurosurgery, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Sadiya Ahmad
- Department of Neurosurgery, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Katherine G. Mayfield
- Department of Neurosurgery, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Lauren M. Fletcher
- Department of Neurosurgery, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Murat H. Digicaylioglu
- Department of Neurosurgery, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Naomi L. Sayre
- Department of Neurosurgery, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
- South Texas Veteran's Health Care System, San Antonio, Texas, USA
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Wang YF, Parpura V. Astroglial Modulation of Hydromineral Balance and Cerebral Edema. Front Mol Neurosci 2018; 11:204. [PMID: 29946238 PMCID: PMC6007284 DOI: 10.3389/fnmol.2018.00204] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Accepted: 05/22/2018] [Indexed: 12/11/2022] Open
Abstract
Maintenance of hydromineral balance (HB) is an essential condition for life activity at cellular, tissue, organ and system levels. This activity has been considered as a function of the osmotic regulatory system that focuses on hypothalamic vasopressin (VP) neurons, which can reflexively release VP into the brain and blood to meet the demand of HB. Recently, astrocytes have emerged as an essential component of the osmotic regulatory system in addition to functioning as a regulator of the HB at cellular and tissue levels. Astrocytes express all the components of osmoreceptors, including aquaporins, molecules of the extracellular matrix, integrins and transient receptor potential channels, with an operational dynamic range allowing them to detect and respond to osmotic changes, perhaps more efficiently than neurons. The resultant responses, i.e., astroglial morphological and functional plasticity in the supraoptic and paraventricular nuclei, can be conveyed, physically and chemically, to adjacent VP neurons, thereby influencing HB at the system level. In addition, astrocytes, particularly those in the circumventricular organs, are involved not only in VP-mediated osmotic regulation, but also in regulation of other osmolality-modulating hormones, including natriuretic peptides and angiotensin. Thus, astrocytes play a role in local/brain and systemic HB. The adaptive astrocytic reactions to osmotic challenges are associated with signaling events related to the expression of glial fibrillary acidic protein and aquaporin 4 to promote cell survival and repair. However, prolonged osmotic stress can initiate inflammatory and apoptotic signaling processes, leading to glial dysfunction and a variety of brain diseases. Among many diseases of brain injury and hydromineral disorders, cytotoxic and osmotic cerebral edemas are the most common pathological manifestation. Hyponatremia is the most common cause of osmotic cerebral edema. Overly fast correction of hyponatremia could lead to central pontine myelinolysis. Ischemic stroke exemplifies cytotoxic cerebral edema. In this review, we summarize and analyze the osmosensory functions of astrocytes and their implications in cerebral edema.
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Affiliation(s)
- Yu-Feng Wang
- Department of Physiology, School of Basic Medical Sciences, Harbin Medical University, Harbin, China
| | - Vladimir Parpura
- Department of Neurobiology, The University of Alabama at Birmingham, Birmingham, AL, United States
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11
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Isoflurane post-conditioning down-regulates expression of aquaporin 4 in rats with cerebral ischemia/reperfusion injury and is possibly related to bone morphogenetic protein 4/Smad1/5/8 signaling pathway. Biomed Pharmacother 2018; 97:429-438. [DOI: 10.1016/j.biopha.2017.10.082] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Revised: 10/14/2017] [Accepted: 10/16/2017] [Indexed: 01/25/2023] Open
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12
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Chu H, Yang X, Huang C, Gao Z, Tang Y, Dong Q. Apelin-13 Protects against Ischemic Blood-Brain Barrier Damage through the Effects of Aquaporin-4. Cerebrovasc Dis 2017; 44:10-25. [PMID: 28402976 DOI: 10.1159/000460261] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Accepted: 01/30/2017] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Apelin-13 has been found to have protective effects on many neurological diseases, including cerebral ischemia. However, whether Apelin-13 acts on blood-brain barrier (BBB) disruption following cerebral ischemia is largely unknown. Aquaporin-4 (AQP4) has a close link with BBB due to the high concentration in astrocyte foot processes and regulation of astrocytes function. Here, we aimed to test Apelin-13's effects on ischemic BBB injury and examine whether the effects were dependent on AQP4. METHODS We detected the expression of AQP4 induced by Apelin-13 injection at 1, 3, and 7 days after middle cerebral artery occlusion. Meanwhile, we examined the effects of Apelin-13 on neurological function, infarct volume, and BBB disruption owing to cerebral ischemia in wild type mice, and tested whether such effects were AQP4 dependent by using AQP4 knock-out mice. Furthermore, we assessed the possible signal transduction pathways activated by Apelin-13 to regulate AQP4 expression via astrocyte cultures. RESULTS It was found that Apelin-13 highly increased AQP4 expression as well as reduced neurological scores and infarct volume. Importantly, Apelin-13 played a role of BBB protection in both types of mice by reducing BBB permeability, increased vascular endothelial growth factor, upregulated endothelial nitric oxide synthase, and downregulated inducible NOS. In morphology, we demonstrated Apelin-13 suppressed tight junction opening and endothelial cell swelling via electron microscopy detection. Meanwhile, Apelin-13 also alleviated apoptosis of astrocytes and promoted angiogenesis. Interestingly, effects of AQP4 on neurological function and infarct volume varied with time course, while AQP4 elicited protective effects on BBB at all time points. Statistical analysis of 2-way analysis of variance with replication indicated that AQP4 was required for these effects. In addition, Apelin-13 upregulated phosphorylation of extracellular signal-regulated kinase (ERK) and Akt as well as AQP4 protein in cultured astrocytes. The latter was inhibited by ERK and phosphatidylinositol 3'-kinase (PI3K) inhibitors. CONCLUSION Our data suggest that Apelin-13 protects BBB from disruption after cerebral ischemia both morphologically and functionally, which is highly associated with the increased levels of AQP4, possibly through the activation of ERK and PI3K/Akt pathways. This study provides double targets to protection of ischemic BBB damage, which can present new insights to drugs development.
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Affiliation(s)
- Heling Chu
- Department of Neurology, Huashan Hospital, State Key Laboratory of Medical Neurobiology, Shanghai, China
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13
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Hubbard JA, Szu JI, Binder DK. The role of aquaporin-4 in synaptic plasticity, memory and disease. Brain Res Bull 2017; 136:118-129. [PMID: 28274814 DOI: 10.1016/j.brainresbull.2017.02.011] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 02/27/2017] [Accepted: 02/28/2017] [Indexed: 12/25/2022]
Abstract
Since the discovery of aquaporins, it has become clear that the various mammalian aquaporins play critical physiological roles in water and ion balance in multiple tissues. Aquaporin-4 (AQP4), the principal aquaporin expressed in the central nervous system (CNS, brain and spinal cord), has been shown to mediate CNS water homeostasis. In this review, we summarize new and exciting studies indicating that AQP4 also plays critical and unanticipated roles in synaptic plasticity and memory formation. Next, we consider the role of AQP4 in Alzheimer's disease (AD), amyotrophic lateral sclerosis (ALS), Parkinson's disease (PD), multiple sclerosis (MS), neuromyelitis optica (NMO), epilepsy, traumatic brain injury (TBI), and stroke. Each of these conditions involves changes in AQP4 expression and/or distribution that may be functionally relevant to disease physiology. Insofar as AQP4 is exclusively expressed on astrocytes, these data provide new evidence of "astrocytopathy" in the etiology of diverse neurological diseases.
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Affiliation(s)
- Jacqueline A Hubbard
- Center for Glial-Neuronal Interactions, Division of Biomedical Sciences, School of Medicine, University of California, Riverside, United States
| | - Jenny I Szu
- Center for Glial-Neuronal Interactions, Division of Biomedical Sciences, School of Medicine, University of California, Riverside, United States
| | - Devin K Binder
- Center for Glial-Neuronal Interactions, Division of Biomedical Sciences, School of Medicine, University of California, Riverside, United States.
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Aquaporin-4 and Cerebrovascular Diseases. Int J Mol Sci 2016; 17:ijms17081249. [PMID: 27529222 PMCID: PMC5000647 DOI: 10.3390/ijms17081249] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 07/20/2016] [Accepted: 07/26/2016] [Indexed: 12/16/2022] Open
Abstract
Cerebrovascular diseases are conditions caused by problems with brain vasculature, which have a high morbidity and mortality. Aquaporin-4 (AQP4) is the most abundant water channel in the brain and crucial for the formation and resolution of brain edema. Considering brain edema is an important pathophysiological change after stoke, AQP4 is destined to have close relation with cerebrovascular diseases. However, this relation is not limited to brain edema due to other biological effects elicited by AQP4. Till now, multiple studies have investigated roles of AQP4 in cerebrovascular diseases. This review focuses on expression of AQP4 and the effects of AQP4 on brain edema and neural cells injuries in cerebrovascular diseases including cerebral ischemia, intracerebral hemorrhage and subarachnoid hemorrhage. In the current review, we pay more attention to the studies of recent years directly from cerebrovascular diseases animal models or patients, especially those using AQP4 gene knockout mice. This review also elucidates the potential of AQP4as an excellent therapeutic target.
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15
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Lan YL, Fang DY, Zhao J, Ma TH, Li S. A research update on the potential roles of aquaporin 4 in neuroinflammation. Acta Neurol Belg 2016; 116:127-34. [PMID: 26259614 DOI: 10.1007/s13760-015-0520-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Accepted: 07/27/2015] [Indexed: 12/20/2022]
Abstract
The presence of aquaporins (AQPs) in the brain has led to intense research on the underlying roles of this family of proteins under both normal and pathological conditions. Aquaporin 4 (AQP4) is the major water-channel membrane protein expressed in the central nervous system (CNS), primarily in astrocytes. Emerging evidence suggests that AQP4 could play an important role in water and ion homeostasis in the brain, and it has been studied in various brain pathological conditions. However, far less is known about the potential for AQP4 to influence neuroinflammation and, furthermore, its potential role in neurodegenerative disorders such as Alzheimer's disease (AD). It has been suggested that the pathogenesis of many clinical diseases, such as neuromyelitis optica (NMO), multiple sclerosis (MS) and brain injuries, is related to the regulation of AQP4 expression. Investigating the effects of AQP4 on microglia and astrocytes could be important to understand its role in the pathogenesis of neuroinflammation. Although the exact roles of non-steroidal anti-inflammatory drugs (NSAIDs) in protection against the detrimental effects of neuroinflammation remain unclear, research into the possible neuroprotective effects of AQP4 against neuroinflammation regulation seems to be important for future investigations.
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Affiliation(s)
- Yu-Long Lan
- Department of Physiology, Dalian Medical University, Dalian, 116044, China
| | - Deng-Yang Fang
- Department of Physiology, Dalian Medical University, Dalian, 116044, China
| | - Jie Zhao
- Liaoning Engineering Technology Centre of Target-based Nature Products for Prevention and Treatment of Ageing-related Neurodegeneration, Dalian, 116044, China
| | - Tong-Hui Ma
- Department of Physiology, Dalian Medical University, Dalian, 116044, China.
- College of Basic Sciences, Dalian Medical University, Dalian, 116044, China.
| | - Shao Li
- Department of Physiology, Dalian Medical University, Dalian, 116044, China.
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16
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Soltani Z, Khaksari M, Shahrokhi N, Mohammadi G, Mofid B, Vaziri A, Amiresmaili S. Effect of estrogen and/or progesterone administration on traumatic brain injury-caused brain edema: the changes of aquaporin-4 and interleukin-6. J Physiol Biochem 2015; 72:33-44. [PMID: 26638215 DOI: 10.1007/s13105-015-0453-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 11/24/2015] [Indexed: 11/28/2022]
Abstract
The role of aquaporin-4 (AQP4) and interleukin-6 (IL-6) in the development of brain edema post-traumatic brain injury (TBI) has been indicated. The present study was designed to investigate the effect(s) of administration of progesterone (P) and/or estrogen (E) on brain water content, AQP4 expression, and IL-6 levels post-TBI. The ovariectomized rats were divided into 11 groups: sham, one vehicle, two vehicles, E1, E2, P1, P2, E1 + P1, E1 + P2, E2 + P1, and E2 + P2. The brain AQP4 expression, IL-6 levels, and water content were evaluated 24 h after TBI induced by Marmarou's method. The low (E1 and P1) and high (E2 and P2) doses of estrogen and progesterone were administered 30 min post-TBI. The results showed that brain water content and AQP4 expression decreased in the E1, E2, P1, and P2-treated groups. The administration of E1 decreased IL-6 levels. Addition of progesterone decreased the inhibitory effect of E1 and E2 on the accumulation of water in the brain. Administration of E1 + P1 and E1 + P2 decreased the inhibitory effect of E1 on the IL-6 levels and AQP4 protein expression. Our findings suggest that estrogen or progesterone by itself has more effective roles in decrease of brain edema than combination of both. Possible mechanism may be mediated by the alteration of AQP4 and IL-6 expression. However, further studies are required to verify the exact mechanism.
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Affiliation(s)
- Zahra Soltani
- Physiology Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Mohammad Khaksari
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran.
| | - Nader Shahrokhi
- Physiology Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Gholamabbas Mohammadi
- Department of Biochemistry, Medical School of Afzalipour, Kerman University of Medical Sciences, Kerman, Iran
| | - Behshad Mofid
- Department of Neurosurgery, Shahid Bahonar Hospital of Kerman, Kerman, Iran
| | - Ali Vaziri
- Department of Biochemistry, Medical School of Afzalipour, Kerman University of Medical Sciences, Kerman, Iran
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Jeong HK, Ji KM, Min KJ, Choi I, Choi DJ, Jou I, Joe EH. Astrogliosis is a possible player in preventing delayed neuronal death. Mol Cells 2014; 37:345-55. [PMID: 24802057 PMCID: PMC4012084 DOI: 10.14348/molcells.2014.0046] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 03/27/2014] [Accepted: 03/28/2014] [Indexed: 12/11/2022] Open
Abstract
Mitigating secondary delayed neuronal injury has been a therapeutic strategy for minimizing neurological symptoms after several types of brain injury. Interestingly, secondary neuronal loss appeared to be closely related to functional loss and/or death of astrocytes. In the brain damage induced by agonists of two glutamate receptors, N-ethyl-D-aspartic acid (NMDA) and kainic acid (KA), NMDA induced neuronal death within 3 h, but did not increase further thereafter. However, in the KA-injected brain, neuronal death was not obviously detectable even at injection sites at 3 h, but extensively increased to encompass the entire hemisphere at 7 days. Brain inflammation, a possible cause of secondary neuronal damage, showed little differences between the two models. Importantly, however, astrocyte behavior was completely different. In the NMDA-injected cortex, the loss of glial fibrillary acidic protein-expressing (GFAP+) astrocytes was confined to the injection site until 7 days after the injection, and astrocytes around the damage sites showed extensive gliosis and appeared to isolate the damage sites. In contrast, in the KA-injected brain, GFAP+ astrocytes, like neurons, slowly, but progressively, disappeared across the entire hemisphere. Other markers of astrocytes, including S100β, glutamate transporter EAAT2, the potassium channel Kir4.1 and glutamine synthase, showed patterns similar to that of GFAP in both NMDA- and KA-injected cortexes. More importantly, astrocyte disappearance and/or functional loss preceded neuronal death in the KA-injected brain. Taken together, these results suggest that loss of astrocyte support to neurons may be a critical cause of delayed neuronal death in the injured brain.
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Affiliation(s)
- Hey-Kyeong Jeong
- Department of Pharmacology, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Biomedical Sciences Neuroscience Graduate Program, Ajou University School of Medicine, Suwon 442-721,
Korea
- Brain Disease Research Center, Ajou University School of Medicine, Suwon 442-721,
Korea
| | - Kyung-Min Ji
- Department of Pharmacology, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Biomedical Sciences Neuroscience Graduate Program, Ajou University School of Medicine, Suwon 442-721,
Korea
- Brain Disease Research Center, Ajou University School of Medicine, Suwon 442-721,
Korea
| | - Kyoung-Jin Min
- Department of Pharmacology, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Biomedical Sciences Neuroscience Graduate Program, Ajou University School of Medicine, Suwon 442-721,
Korea
- Brain Disease Research Center, Ajou University School of Medicine, Suwon 442-721,
Korea
| | - Insup Choi
- Department of Pharmacology, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Biomedical Sciences Neuroscience Graduate Program, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Brain Science, Ajou University School of Medicine, Suwon 442-721,
Korea
| | - Dong-Joo Choi
- Department of Pharmacology, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Biomedical Sciences Neuroscience Graduate Program, Ajou University School of Medicine, Suwon 442-721,
Korea
- Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Brain Science, Ajou University School of Medicine, Suwon 442-721,
Korea
| | - Ilo Jou
- Department of Pharmacology, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Biomedical Sciences Neuroscience Graduate Program, Ajou University School of Medicine, Suwon 442-721,
Korea
- Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon 442-721,
Korea
| | - Eun-Hye Joe
- Department of Pharmacology, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Biomedical Sciences Neuroscience Graduate Program, Ajou University School of Medicine, Suwon 442-721,
Korea
- Brain Disease Research Center, Ajou University School of Medicine, Suwon 442-721,
Korea
- Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon 442-721,
Korea
- Department of Brain Science, Ajou University School of Medicine, Suwon 442-721,
Korea
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18
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Jeong HK, Jou I, Joe EH. Absence of Delayed Neuronal Death in ATP-Injected Brain: Possible Roles of Astrogliosis. Exp Neurobiol 2013; 22:308-14. [PMID: 24465146 PMCID: PMC3897692 DOI: 10.5607/en.2013.22.4.308] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2013] [Revised: 12/14/2013] [Accepted: 12/16/2013] [Indexed: 11/19/2022] Open
Abstract
Although secondary delayed neuronal death has been considered as a therapeutic target to minimize brain damage induced by several injuries, delayed neuronal death does not occur always. In this study, we investigated possible mechanisms that prevent delayed neuronal death in the ATP-injected substantia nigra (SN) and cortex, where delayed neuronal death does not occur. In both the SN and cortex, ATP rapidly induced death of the neurons and astrocytes in the injection core area within 3 h, and the astrocytes in the penumbra region became hypertropic and rapidly surrounded the damaged areas. It was observed that the neurons survived for up to 1-3 months in the area where the astrocytes became hypertropic. The damaged areas of astrocytes gradually reduced at 3 days, 7 days, and 1-3 months. Astrocyte proliferation was detectable at 3-7 days, and vimentin was expressed in astrocytes that surrounded and/or protruded into the damaged sites. The NeuN-positive cells also reappeared in the injury sites where astrocytes reappeared. Taken together, these results suggest that astroycte survival and/or gliosis in the injured brain may be critical for neuronal survival and may prevent delayed neuronal death in the injured brain.
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Affiliation(s)
- Hey-Kyeong Jeong
- Department of Pharmacology, Ajou University School of Medicine, Suwon 443-721, Korea. ; Neuroscience Graduate Program in Department of Biomedical Sciences, Ajou University School of Medicine, Suwon 443-721, Korea
| | - Ilo Jou
- Department of Pharmacology, Ajou University School of Medicine, Suwon 443-721, Korea. ; Neuroscience Graduate Program in Department of Biomedical Sciences, Ajou University School of Medicine, Suwon 443-721, Korea. ; Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon 443-721, Korea
| | - Eun-Hye Joe
- Department of Pharmacology, Ajou University School of Medicine, Suwon 443-721, Korea. ; Neuroscience Graduate Program in Department of Biomedical Sciences, Ajou University School of Medicine, Suwon 443-721, Korea. ; Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon 443-721, Korea. ; Brain Disease Research Center, Ajou University School of Medicine, Suwon 443-721, Korea
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