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Terrabuio E, Zenaro E, Constantin G. The role of the CD8+ T cell compartment in ageing and neurodegenerative disorders. Front Immunol 2023; 14:1233870. [PMID: 37575227 PMCID: PMC10416633 DOI: 10.3389/fimmu.2023.1233870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 07/13/2023] [Indexed: 08/15/2023] Open
Abstract
CD8+ lymphocytes are adaptive immunity cells with the particular function to directly kill the target cell following antigen recognition in the context of MHC class I. In addition, CD8+ T cells may release pro-inflammatory cytokines, such as tumor necrosis factor-α (TNF-α) and interferon-γ (IFN-γ), and a plethora of other cytokines and chemoattractants modulating immune and inflammatory responses. A role for CD8+ T cells has been suggested in aging and several diseases of the central nervous system (CNS), including Alzheimer's disease, Parkinson's disease, multiple sclerosis, amyotrophic lateral sclerosis, limbic encephalitis-induced temporal lobe epilepsy and Susac syndrome. Here we discuss the phenotypic and functional alterations of CD8+ T cell compartment during these conditions, highlighting similarities and differences between CNS disorders. Particularly, we describe the pathological changes in CD8+ T cell memory phenotypes emphasizing the role of senescence and exhaustion in promoting neuroinflammation and neurodegeneration. We also discuss the relevance of trafficking molecules such as selectins, mucins and integrins controlling the extravasation of CD8+ T cells into the CNS and promoting disease development. Finally, we discuss how CD8+ T cells may induce CNS tissue damage leading to neurodegeneration and suggest that targeting detrimental CD8+ T cells functions may have therapeutic effect in CNS disorders.
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Affiliation(s)
- Eleonora Terrabuio
- Department of Medicine, Section of General Pathology, University of Verona, Verona, Italy
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Bharadwaj A, Sharma A, Singh T, Pathak D, Virmani T, Kumar G, Sharma A, Alhalmi A. Attenuation of Strychnine-Induced Epilepsy Employing Amaranthus viridis L. Leaves Extract in Experimental Rats. Behav Neurol 2023; 2023:6684781. [PMID: 36959866 PMCID: PMC10030215 DOI: 10.1155/2023/6684781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/26/2023] [Accepted: 03/01/2023] [Indexed: 03/17/2023] Open
Abstract
Objective Epilepsy is one of the most prevalent neurological illnesses defined by periodic seizures with or without loss of consciousness caused by aberrant neural activity. There are many allopathic medications available for the treatment of epilepsy such as phenytoin (PHY), but the side effects are a major concern. Therefore, the present study involved the evaluation of the pharmacological significance of Amaranthus viridis L. extract (EAV) in the management of strychnine (STR)-induced epilepsy. Method STR (3.5 mg/kg, i.p.) was injected into male rats 30 minutes after the pre-treatment of a standard drug (PHY: 20 mg/kg) and the two doses of EAV (EAV-200 and EAV-400 mg/kg, p.o.) to the respective groups to cause the convulsions. The anti-convulsant effect of EAV-200 and EAV-400 against STR-induced convulsion in rats was investigated in terms of convulsion onset, duration of convulsions, number of convulsions, and convulsion score. Furthermore, the mitochondrial function and integrity in the brain's prefrontal cortex (PFC) were also estimated. Results EAV-400 significantly increased the onset of convulsion from 61.67 ± 3.051 to 119.2 ± 2.738 and reduced the STR-induced duration of convulsions from 144.8 ± 3.582 to 69.17 ± 3.736, number of convulsions from 4.000 ± 0.1592 to 1.533 ± 0.1542, and convulsion score from 5.000 ± 0.3651 to 2.833 ± 0.3073 in rats. EAV-400 significantly attenuated the STR-induced decrease in the mitochondrial function and integrity of the rat PFC. In rats, EAV-400 significantly accelerated the onset of convulsions while decreasing the STR-induced duration, frequency, and score. Conclusion Based on investigational findings, EAV-400 could be inferred to be a possible anti-epileptic option for the treatment of epilepsy of this plan in preclinical research.
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Affiliation(s)
- Aashish Bharadwaj
- 1School of Pharmaceutical Sciences, MVN University, Palwal, Haryana 121105, India
| | - Ashwani Sharma
- 1School of Pharmaceutical Sciences, MVN University, Palwal, Haryana 121105, India
| | - Talever Singh
- 2Rajiv Academy for Pharmacy, Chhatikra, Mathura 281003, India
| | - Devender Pathak
- 2Rajiv Academy for Pharmacy, Chhatikra, Mathura 281003, India
| | - Tarun Virmani
- 1School of Pharmaceutical Sciences, MVN University, Palwal, Haryana 121105, India
| | - Girish Kumar
- 1School of Pharmaceutical Sciences, MVN University, Palwal, Haryana 121105, India
| | | | - Abdulsalam Alhalmi
- 4Department of Pharmaceutical Science, College of Pharmacy, Aden University, Aden, Yemen
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Hu J, Ran H, Chen G, He Y, Li Q, Liu J, Li F, Liu H, Zhang T. Altered neurovascular coupling in children with idiopathic generalized epilepsy. CNS Neurosci Ther 2022; 29:609-618. [PMID: 36480481 PMCID: PMC9873522 DOI: 10.1111/cns.14039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 11/09/2022] [Accepted: 11/13/2022] [Indexed: 12/13/2022] Open
Abstract
AIMS Alterations in neuronal activity and cerebral hemodynamics have been reported in idiopathic generalized epilepsy (IGE) patients, possibly resulting in neurovascular decoupling; however, no neuroimaging evidence confirmed this disruption. This study aimed to investigate the possible presence of neurovascular decoupling and its clinical implications in childhood IGE using resting-state fMRI and arterial spin labeling imaging. METHODS IGE patients and healthy participants underwent resting-state fMRI and arterial spin labeling imaging to calculate degree centrality (DC) and cerebral blood flow (CBF), respectively. Across-voxel CBF-DC correlations were analyzed to evaluate the neurovascular coupling within the whole gray matter, and the regional coupling of brain region was assessed with the CBF/DC ratio. RESULTS The study included 26 children with IGE and 35 sex- and age-matched healthy controls (HCs). Compared with the HCs, the IGE group presented lower across-voxel CBF-DC correlations, higher CBF/DC ratio in the right posterior cingulate cortex/precuneus, middle frontal gyrus, and medial frontal gyrus (MFG), and lower ratio in the left inferior frontal gyrus. The increased CBF/DC ratio in the right MFG was correlated with lower performance intelligence quotient scores in the IGE group. CONCLUSION Children with IGE present altered neurovascular coupling, associated with lower performance intelligence quotient scores. The study shed a new insight into the pathophysiology of epilepsy and provided potential imaging biomarkers of cognitive performances in children with IGE.
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Affiliation(s)
- Jie Hu
- Department of RadiologyThe Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou ProvinceZunyiChina,Department of Radiology and Nuclear MedicineXuanwu Hospital, Capital Medical UniversityBeijingChina
| | - Haifeng Ran
- Department of RadiologyThe Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou ProvinceZunyiChina
| | - Guiqin Chen
- Department of RadiologyThe Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou ProvinceZunyiChina
| | - Yulun He
- Department of RadiologyThe Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou ProvinceZunyiChina
| | - Qinghui Li
- Department of RadiologyThe Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou ProvinceZunyiChina
| | - Junwei Liu
- Department of RadiologyThe Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou ProvinceZunyiChina
| | - Fangling Li
- Department of RadiologyThe Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou ProvinceZunyiChina
| | - Heng Liu
- Department of RadiologyThe Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou ProvinceZunyiChina
| | - Tijiang Zhang
- Department of RadiologyThe Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou ProvinceZunyiChina
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Staicu CE, Jipa F, Axente E, Radu M, Radu BM, Sima F. Lab-on-a-Chip Platforms as Tools for Drug Screening in Neuropathologies Associated with Blood-Brain Barrier Alterations. Biomolecules 2021; 11:916. [PMID: 34205550 PMCID: PMC8235582 DOI: 10.3390/biom11060916] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/15/2021] [Accepted: 06/16/2021] [Indexed: 12/19/2022] Open
Abstract
Lab-on-a-chip (LOC) and organ-on-a-chip (OOC) devices are highly versatile platforms that enable miniaturization and advanced controlled laboratory functions (i.e., microfluidics, advanced optical or electrical recordings, high-throughput screening). The manufacturing advancements of LOCs/OOCs for biomedical applications and their current limitations are briefly discussed. Multiple studies have exploited the advantages of mimicking organs or tissues on a chip. Among these, we focused our attention on the brain-on-a-chip, blood-brain barrier (BBB)-on-a-chip, and neurovascular unit (NVU)-on-a-chip applications. Mainly, we review the latest developments of brain-on-a-chip, BBB-on-a-chip, and NVU-on-a-chip devices and their use as testing platforms for high-throughput pharmacological screening. In particular, we analyze the most important contributions of these studies in the field of neurodegenerative diseases and their relevance in translational personalized medicine.
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Affiliation(s)
- Cristina Elena Staicu
- Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, 050095 Bucharest, Romania;
- Center for Advanced Laser Technologies, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania; (F.J.); (E.A.); (F.S.)
| | - Florin Jipa
- Center for Advanced Laser Technologies, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania; (F.J.); (E.A.); (F.S.)
| | - Emanuel Axente
- Center for Advanced Laser Technologies, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania; (F.J.); (E.A.); (F.S.)
| | - Mihai Radu
- Department of Life and Environmental Physics, ‘Horia Hulubei’ National Institute for Physics and Nuclear Engineering, 077125 Măgurele, Romania;
| | - Beatrice Mihaela Radu
- Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, 050095 Bucharest, Romania;
| | - Felix Sima
- Center for Advanced Laser Technologies, National Institute for Laser, Plasma and Radiation Physics, 077125 Măgurele, Romania; (F.J.); (E.A.); (F.S.)
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Cameron T, Bennet T, Rowe EM, Anwer M, Wellington CL, Cheung KC. Review of Design Considerations for Brain-on-a-Chip Models. MICROMACHINES 2021; 12:441. [PMID: 33921018 PMCID: PMC8071412 DOI: 10.3390/mi12040441] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/12/2021] [Accepted: 04/12/2021] [Indexed: 02/06/2023]
Abstract
In recent years, the need for sophisticated human in vitro models for integrative biology has motivated the development of organ-on-a-chip platforms. Organ-on-a-chip devices are engineered to mimic the mechanical, biochemical and physiological properties of human organs; however, there are many important considerations when selecting or designing an appropriate device for investigating a specific scientific question. Building microfluidic Brain-on-a-Chip (BoC) models from the ground-up will allow for research questions to be answered more thoroughly in the brain research field, but the design of these devices requires several choices to be made throughout the design development phase. These considerations include the cell types, extracellular matrix (ECM) material(s), and perfusion/flow considerations. Choices made early in the design cycle will dictate the limitations of the device and influence the end-point results such as the permeability of the endothelial cell monolayer, and the expression of cell type-specific markers. To better understand why the engineering aspects of a microfluidic BoC need to be influenced by the desired biological environment, recent progress in microfluidic BoC technology is compared. This review focuses on perfusable blood-brain barrier (BBB) and neurovascular unit (NVU) models with discussions about the chip architecture, the ECM used, and how they relate to the in vivo human brain. With increased knowledge on how to make informed choices when selecting or designing BoC models, the scientific community will benefit from shorter development phases and platforms curated for their application.
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Affiliation(s)
- Tiffany Cameron
- School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (T.C.); (T.B.)
- Centre for Blood Research, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Tanya Bennet
- School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (T.C.); (T.B.)
- Centre for Blood Research, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Elyn M. Rowe
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (E.M.R.); (M.A.); (C.L.W.)
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Mehwish Anwer
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (E.M.R.); (M.A.); (C.L.W.)
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Cheryl L. Wellington
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (E.M.R.); (M.A.); (C.L.W.)
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Karen C. Cheung
- School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (T.C.); (T.B.)
- Centre for Blood Research, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Electrical & Computer Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
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Ca 2+ homeostasis in brain microvascular endothelial cells. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2021; 362:55-110. [PMID: 34253298 DOI: 10.1016/bs.ircmb.2021.01.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Blood brain barrier (BBB) is formed by the brain microvascular endothelial cells (BMVECs) lining the wall of brain capillaries. Its integrity is regulated by multiple mechanisms, including up/downregulation of tight junction proteins or adhesion molecules, altered Ca2+ homeostasis, remodeling of cytoskeleton, that are confined at the level of BMVECs. Beside the contribution of BMVECs to BBB permeability changes, other cells, such as pericytes, astrocytes, microglia, leukocytes or neurons, etc. are also exerting direct or indirect modulatory effects on BBB. Alterations in BBB integrity play a key role in multiple brain pathologies, including neurological (e.g. epilepsy) and neurodegenerative disorders (e.g. Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis etc.). In this review, the principal Ca2+ signaling pathways in brain microvascular endothelial cells are discussed and their contribution to BBB integrity is emphasized. Improving the knowledge of Ca2+ homeostasis alterations in BMVECa is fundamental to identify new possible drug targets that diminish/prevent BBB permeabilization in neurological and neurodegenerative disorders.
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Salari V, Mengoni F, Del Gallo F, Bertini G, Fabene PF. The Anti-Inflammatory Properties of Mesenchymal Stem Cells in Epilepsy: Possible Treatments and Future Perspectives. Int J Mol Sci 2020; 21:ijms21249683. [PMID: 33353235 PMCID: PMC7765947 DOI: 10.3390/ijms21249683] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 12/15/2020] [Accepted: 12/16/2020] [Indexed: 12/12/2022] Open
Abstract
Mesenchymal stem cells (MSCs) are multipotent adult cells with self-renewing capacities. MSCs display specific properties, such as the ability to repair damaged tissues, resulting in optimal candidates for cell therapy against degenerative diseases. In addition to the reparative functions of MSCs, growing evidence shows that these cells have potent immunomodulatory and anti-inflammatory properties. Therefore, MSCs are potential tools for treating inflammation-related neurological diseases, including epilepsy. In this regard, over the last decades, epilepsy has no longer been considered a purely neuronal pathology, since inflammatory events underlying the genesis of epilepsy have been demonstrated. This review assessed current knowledge on the use of MSCs in the treatment of epilepsy. Mostly, attention will be focused on the anti-inflammatory and immunological skills of MSCs. Understanding the mechanisms by which MSCs might modulate the severity of the disease will contribute to the development of new potential alternatives for both prophylaxis and treatment against epilepsy.
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Li C, Ma W, Zhao Y, Wang H. Changes in the expression of endothelial monocyte‑activating polypeptide II in the rat hippocampus following status epilepticus. Int J Mol Med 2020; 47:699-707. [PMID: 33416103 PMCID: PMC7797450 DOI: 10.3892/ijmm.2020.4808] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 11/10/2020] [Indexed: 11/08/2022] Open
Abstract
Endothelial monocyte-activating polypeptide II (EMAP II) is a sensitive marker of neurotoxic injury, the expression of which increases significantly under conditions of stress, such as hypoxia or apoptosis. Studies have confirmed the extensive apoptosis of nerve cells in the brain following status epilepticus (SE), and the occurrence of SE can confer a hypoxic state on cells. The purpose of the present study was to observe the changes in the expression of EMAP II, and in the numbers and tight junction protein levels of micro-vascular endothelial cells in the hippocampus of rats with pilocarpine-induced SE. The protein expression levels of EMAP II, CD31, zonula occludens 1 (ZO-1) and occludin in the hippocampus were determined by immunofluorescence and western blot analyses. It was found that almost 75.6% of the rats in the SE group developed Racine stage IV-V seizures at approximately 44.7±18.8 min after the pilocarpine administration, and the 24-h mortality rate was almost 10.4%. The weight of the rats in the SE group was significantly decreased within 24 h following SE. Immunofluorescence staining revealed a low EMAP II expression in the hippo-campus of the rats in the control group; however, the numbers of EMAP II-positive cells were significantly increased in the SE group from 2 h to 21 days. The trend of EMAP II protein expression was consistent with that obtained with immunofluorescence staining. The numbers of CD31-positive microvascular endothelial cells were significantly increased from 24 h to 21 days compared with the levels in the control group. The protein expression of ZO-1 and occludin was most significantly decreased in the SE group. On the whole, the present study demonstrated that the expression of EMAP II in the rat hippocampus was upregulated in the SE model, which may promote angiogenesis and alter the TJ integrity of brain microvascular endothelial cells, with an increased number of CD31-positive microvascular endothelial cells and a decreased expression of ZO-1 and occludin.
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Affiliation(s)
- Chun Li
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Weining Ma
- Department of Neurosurgery, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110022, P.R. China
| | - Yajuan Zhao
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Hua Wang
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
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Tao Z, Chun-Yan H, Hua P, Bin-Bin Y, Xiaoping T. Phyllathin From Phyllanthus Amarus Ameliorates Epileptic Convulsion and Kindling Associated Post-Ictal Depression in Mice via Inhibition of NF-κB/TLR-4 Pathway. Dose Response 2020; 18:1559325820946914. [PMID: 32821254 PMCID: PMC7412921 DOI: 10.1177/1559325820946914] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 06/14/2020] [Accepted: 07/04/2020] [Indexed: 12/13/2022] Open
Abstract
Background Epilepsy is a chronic, complex, unprovoked, and recurrent disorder of the nervous system that affected several people worldwide. Phyllanthus amarus (PA) has been documented to have neuroprotective potential. Aim To evaluate the potential of standardized extract of PA and its possible mechanism of action against the Pentylenetetrazol (PTZ)-induced convulsion and kindling associated post-ictal depression in experimental mice. Materials and Methods Phyllathin was isolated from methanolic extract of PA and well-characterized using HPTLC, ESI-MS/MS, and LC/MS. Phyllathin containing a standardized extract of PA (50, 100, and 200 mg/kg) was administered in convulsed and kindled mice, followed by an assessment of various parameters. Results The spectral analysis confirmed the molecular formula and weight of phyllanthin as C24H34O6 and 418.2342 Da. PA (100 and 200 mg/kg) significantly ameliorated PTZ-induced (p < 0.05) duration, onset of tonic-clonic convulsion, and mortality in mice. It also significantly attenuated (p < 0.05) PTZ-induced kindling in mice. Alteration in brain GABA, dopamine, and glutamate, Na+K+ATPase, Ca+2-ATPase activities, and oxido-nitrosative stress in kindled mice was significantly restored (p < 0.05) by PA treatment. It also significantly (p < 0.05) down-regulated brain mRNA expressions of NF-κB, TNF-α, IL-1β, COX-2, and TLR-4. Histological aberrations induced by PTZ in the brain of a kindled rat was significantly (p < 0.05) ameliorated by PA. Conclusion Phyllanthin containing a standardized extract of PA exerts its antiepileptic potential via balancing excitatory (glutamate) and inhibitory (GABA) brain monoamines, voltage-gated ion channels (Na+K+/Ca+2-ATPase) and inhibition of NF-κB/TLR-4 pathway to ameliorate neuroinflammation (TNF-α, IL-1β, and COX-2) in experimental mice.
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Affiliation(s)
- Zhang Tao
- Department of Neurosurgery, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Hu Chun-Yan
- Department of Urology, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Peng Hua
- Department of Neurosurgery, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Yang Bin-Bin
- Department of Neurosurgery, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Tang Xiaoping
- Department of Neurosurgery, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
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Veys K, Fan Z, Ghobrial M, Bouché A, García-Caballero M, Vriens K, Conchinha NV, Seuwen A, Schlegel F, Gorski T, Crabbé M, Gilardoni P, Ardicoglu R, Schaffenrath J, Casteels C, De Smet G, Smolders I, Van Laere K, Abel ED, Fendt SM, Schroeter A, Kalucka J, Cantelmo AR, Wälchli T, Keller A, Carmeliet P, De Bock K. Role of the GLUT1 Glucose Transporter in Postnatal CNS Angiogenesis and Blood-Brain Barrier Integrity. Circ Res 2020; 127:466-482. [PMID: 32404031 PMCID: PMC7386868 DOI: 10.1161/circresaha.119.316463] [Citation(s) in RCA: 99] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Supplemental Digital Content is available in the text. Rationale: Endothelial cells (ECs) are highly glycolytic and generate the majority of their energy via the breakdown of glucose to lactate. At the same time, a main role of ECs is to allow the transport of glucose to the surrounding tissues. GLUT1 (glucose transporter isoform 1/Slc2a1) is highly expressed in ECs of the central nervous system (CNS) and is often implicated in blood-brain barrier (BBB) dysfunction, but whether and how GLUT1 controls EC metabolism and function is poorly understood. Objective: We evaluated the role of GLUT1 in endothelial metabolism and function during postnatal CNS development as well as at the adult BBB. Methods and Results: Inhibition of GLUT1 decreases EC glucose uptake and glycolysis, leading to energy depletion and the activation of the cellular energy sensor AMPK (AMP-activated protein kinase), and decreases EC proliferation without affecting migration. Deletion of GLUT1 from the developing postnatal retinal endothelium reduces retinal EC proliferation and lowers vascular outgrowth, without affecting the number of tip cells. In contrast, in the brain, we observed a lower number of tip cells in addition to reduced brain EC proliferation, indicating that within the CNS, organotypic differences in EC metabolism exist. Interestingly, when ECs become quiescent, endothelial glycolysis is repressed, and GLUT1 expression increases in a Notch-dependent fashion. GLUT1 deletion from quiescent adult ECs leads to severe seizures, accompanied by neuronal loss and CNS inflammation. Strikingly, this does not coincide with BBB leakiness, altered expression of genes crucial for BBB barrier functioning nor reduced vascular function. Instead, we found a selective activation of inflammatory and extracellular matrix related gene sets. Conclusions: GLUT1 is the main glucose transporter in ECs and becomes uncoupled from glycolysis during quiescence in a Notch-dependent manner. It is crucial for developmental CNS angiogenesis and adult CNS homeostasis but does not affect BBB barrier function.
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Affiliation(s)
- Koen Veys
- From the Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), KU Leuven.,Laboratory of Angiogenesis and Vascular Metabolism (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), Center for Cancer Biology, VIB, Leuven
| | - Zheng Fan
- Laboratory of Exercise and Health, Department of Health Sciences and Technology, Swiss Federal Institute of Technology (ETHZ) Zurich (Z.F., M.G., T.G., P.G., R.A., K.D.B.)
| | - Moheb Ghobrial
- Laboratory of Exercise and Health, Department of Health Sciences and Technology, Swiss Federal Institute of Technology (ETHZ) Zurich (Z.F., M.G., T.G., P.G., R.A., K.D.B.).,Group of CNS Angiogenesis and Neurovascular Link, Neuroscience Center Zurich, University of Zurich (UZH) and ETHZ and Division of Neurosurgery, USZ, Zurich (M.G., T.W.)
| | - Ann Bouché
- From the Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), KU Leuven.,Laboratory of Angiogenesis and Vascular Metabolism (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), Center for Cancer Biology, VIB, Leuven
| | - Melissa García-Caballero
- From the Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), KU Leuven.,Laboratory of Angiogenesis and Vascular Metabolism (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), Center for Cancer Biology, VIB, Leuven
| | - Kim Vriens
- Laboratory of Cellular Metabolism and Metabolic Regulation, Department of Oncology (K. Vriens, S.-M.F.), KU Leuven.,Laboratory of Cellular Metabolism and Metabolic Regulation (K. Vriens, S.-M.F.), Center for Cancer Biology, VIB, Leuven
| | - Nadine Vasconcelos Conchinha
- From the Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), KU Leuven.,Laboratory of Angiogenesis and Vascular Metabolism (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), Center for Cancer Biology, VIB, Leuven
| | - Aline Seuwen
- Institute for Biomedical Engineering (A. Seuwen, F.S., A. Schroeter), UZH/ETHZ, Zurich, Switzerland.,Institute of Pharmacology and Toxicology, UZH, Zurich, Switzerland (A. Seuwen, F.S., A. Schroeter)
| | - Felix Schlegel
- Institute for Biomedical Engineering (A. Seuwen, F.S., A. Schroeter), UZH/ETHZ, Zurich, Switzerland.,Institute of Pharmacology and Toxicology, UZH, Zurich, Switzerland (A. Seuwen, F.S., A. Schroeter)
| | - Tatiane Gorski
- Laboratory of Exercise and Health, Department of Health Sciences and Technology, Swiss Federal Institute of Technology (ETHZ) Zurich (Z.F., M.G., T.G., P.G., R.A., K.D.B.)
| | - Melissa Crabbé
- Nuclear Medicine and Molecular Imaging, Department of Imaging and Pathology, KU Leuven, University Hospitals Leuven, Belgium (M.C., C.C., K.V.L.).,Molecular Small Animal Imaging Centre, KU Leuven (M.C., C.C., K.V.L.)
| | - Paola Gilardoni
- Laboratory of Exercise and Health, Department of Health Sciences and Technology, Swiss Federal Institute of Technology (ETHZ) Zurich (Z.F., M.G., T.G., P.G., R.A., K.D.B.)
| | - Raphaela Ardicoglu
- Laboratory of Exercise and Health, Department of Health Sciences and Technology, Swiss Federal Institute of Technology (ETHZ) Zurich (Z.F., M.G., T.G., P.G., R.A., K.D.B.)
| | - Johanna Schaffenrath
- Neuroscience Center Zurich (J.S., A.K.), UZH/ETHZ, Zurich, Switzerland.,Department of Neurosurgery, Clinical Neurocentre, USZ, Zurich (J.S., A.K.)
| | - Cindy Casteels
- Nuclear Medicine and Molecular Imaging, Department of Imaging and Pathology, KU Leuven, University Hospitals Leuven, Belgium (M.C., C.C., K.V.L.).,Molecular Small Animal Imaging Centre, KU Leuven (M.C., C.C., K.V.L.)
| | - Gino De Smet
- Department of Pharmaceutical Chemistry, Drug Analysis and Drug Information, Center for Neurosciences, Vrije Universiteit Brussel (G.D.S., I.S.)
| | - Ilse Smolders
- Department of Pharmaceutical Chemistry, Drug Analysis and Drug Information, Center for Neurosciences, Vrije Universiteit Brussel (G.D.S., I.S.)
| | - Koen Van Laere
- Nuclear Medicine and Molecular Imaging, Department of Imaging and Pathology, KU Leuven, University Hospitals Leuven, Belgium (M.C., C.C., K.V.L.).,Molecular Small Animal Imaging Centre, KU Leuven (M.C., C.C., K.V.L.)
| | - E Dale Abel
- Laboratory of Exercise and Health, Department of Health Sciences and Technology, Swiss Federal Institute of Technology (ETHZ) Zurich (Z.F., M.G., T.G., P.G., R.A., K.D.B.).,Fraternal Order of Eagles Diabetes Research Center (E.D.A.), University of Iowa.,Division of Endocrinology and Metabolism, Carver College of Medicine (E.D.A.), University of Iowa
| | - Sarah-Maria Fendt
- Laboratory of Cellular Metabolism and Metabolic Regulation, Department of Oncology (K. Vriens, S.-M.F.), KU Leuven.,Laboratory of Cellular Metabolism and Metabolic Regulation (K. Vriens, S.-M.F.), Center for Cancer Biology, VIB, Leuven
| | - Aileen Schroeter
- Institute for Biomedical Engineering (A. Seuwen, F.S., A. Schroeter), UZH/ETHZ, Zurich, Switzerland.,Institute of Pharmacology and Toxicology, UZH, Zurich, Switzerland (A. Seuwen, F.S., A. Schroeter)
| | - Joanna Kalucka
- From the Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), KU Leuven.,Laboratory of Angiogenesis and Vascular Metabolism (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), Center for Cancer Biology, VIB, Leuven.,Aarhus Institute of advanced studies (AIAS) and Department of Biomedicine, Aarhus University (J.K.)
| | - Anna Rita Cantelmo
- From the Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), KU Leuven.,Laboratory of Angiogenesis and Vascular Metabolism (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), Center for Cancer Biology, VIB, Leuven.,Université de Lille, INSERM U1003, Physiologie Cellulaire, France (A.R.C.)
| | - Thomas Wälchli
- Group of CNS Angiogenesis and Neurovascular Link, Neuroscience Center Zurich, University of Zurich (UZH) and ETHZ and Division of Neurosurgery, USZ, Zurich (M.G., T.W.).,Group of Brain Vasculature and Neurovascular Unit, Department of Clinical Neurosciences, University Hospital Geneva (T.W.).,Department of Fundamental Neurobiology, Krembil Research Institute (T.W.), Toronto Western Hospital, University Health Network, University of Toronto.,Division of Neurosurgery, Department of Surgery (T.W.), Toronto Western Hospital, University Health Network, University of Toronto
| | - Annika Keller
- Neuroscience Center Zurich (J.S., A.K.), UZH/ETHZ, Zurich, Switzerland.,Department of Neurosurgery, Clinical Neurocentre, USZ, Zurich (J.S., A.K.)
| | - Peter Carmeliet
- From the Laboratory of Angiogenesis and Vascular Metabolism, Department of Oncology (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), KU Leuven.,Laboratory of Angiogenesis and Vascular Metabolism (K. Veys, A.B., M.G.-C., N.V.C., J.K., A.R.C., P.C.), Center for Cancer Biology, VIB, Leuven
| | - Katrien De Bock
- Laboratory of Exercise and Health, Department of Health Sciences and Technology, Swiss Federal Institute of Technology (ETHZ) Zurich (Z.F., M.G., T.G., P.G., R.A., K.D.B.)
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11
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Vondrakova K, Novotny P, Kubova H, Posusta A, Boron J, Faberova V, Fabene PF, Burchfiel J, Tsenov G. Electrographic seizures induced by activation of ET A and ET B receptors following intrahippocampal infusion of endothelin-1 in immature rats occur by different mechanisms. Exp Neurol 2020; 328:113255. [PMID: 32084451 DOI: 10.1016/j.expneurol.2020.113255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 02/03/2020] [Accepted: 02/18/2020] [Indexed: 11/24/2022]
Abstract
We have demonstrated previously that activation of either the ETA or ETB receptor can induce acute electrographic seizures following the intrahippocampal infusion of endothelin-1 (ET-1) in immature (P12) rats. We also demonstrated that activation of the ETA receptor is associated with marked focal ischemia, while activation of the ETB receptor is not. Exploring the mechanisms underlying seizures induced by these two ET-1 receptor interactions can potentially provide insight into how focal ischemia in immature animals produces seizures and whether ischemiarelated seizures differ from seizures not associated with ischemia. To explore these seizure mechanisms we used microdialysis to determine biomarkers associated with seizures in P12 rats following the intrahippocampal infusion of two different agents: (1) ET-1, which activates both the ETA and ETB receptors and causes focal ischemia and (2) Ala-ET-1, which selectively activates only the ETB receptor and does not cause ischemia. Our results show that seizures associated with combined ETA and ETB receptor activation (and ischemia) have a different temporal distribution and microdialysis profile from seizures associated with ETB activation alone (and without ischemia). Seizures with combined activation peak within the first hour after infusion and the microdialysis profile is characterized by a significant increase in the ratio of glutamic acid to GABA. By contrast, seizures with activation of only the ETB receptor peak in the second hour after infusion and microdialysis shows a significant increase in the ratio of leukotriene B4 to prostaglandin E2. These findings suggest that ischemia-related seizures in immature animals involve an imbalance of excitation and inhibition, while non-ischemiarelated seizures involve an inflammatory process resulting from an excess of leukotrienes.
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Affiliation(s)
- Katerina Vondrakova
- Department of Developmental Epileptology, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic; Faculty of Science, Charles university in Prague, Albertov 6, 12843 Prague, Czech Republic; National Institute of Mental Health, Topolova 748, 25067 Klecany, Czech Republic
| | - Petr Novotny
- Essence Line, Plzeňská 130/221, 150 00 Prague 5, Czech Republic
| | - Hana Kubova
- Department of Developmental Epileptology, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic
| | - Antonin Posusta
- Department of Developmental Epileptology, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic
| | - Jan Boron
- Essence Line, Plzeňská 130/221, 150 00 Prague 5, Czech Republic
| | - Veronika Faberova
- Department of Developmental Epileptology, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic; Veterinary Clinic Well-vet, 14100 Prague, Czech Republic
| | - Paolo Francesco Fabene
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Strada le Grazie 8, 37134 Verona, Italy; INN, Istituto Nazionale delle Neuroscienze, Verona, Italy
| | - James Burchfiel
- Strong Epilepsy Center, Department of Neurology, University of Rochester Medical Center, 601 Elmwood Avenue, Box 673, Rochester, NY 14642, USA
| | - Grygoriy Tsenov
- Department of Developmental Epileptology, Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic; National Institute of Mental Health, Topolova 748, 25067 Klecany, Czech Republic; Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Strada le Grazie 8, 37134 Verona, Italy.
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12
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Tangestani Fard M, Stough C. A Review and Hypothesized Model of the Mechanisms That Underpin the Relationship Between Inflammation and Cognition in the Elderly. Front Aging Neurosci 2019; 11:56. [PMID: 30930767 PMCID: PMC6425084 DOI: 10.3389/fnagi.2019.00056] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 02/26/2019] [Indexed: 12/13/2022] Open
Abstract
Age is associated with increased risk for several disorders including dementias, cardiovascular disease, atherosclerosis, obesity, and diabetes. Age is also associated with cognitive decline particularly in cognitive domains associated with memory and processing speed. With increasing life expectancies in many countries, the number of people experiencing age-associated cognitive impairment is increasing and therefore from both economic and social terms the amelioration or slowing of cognitive aging is an important target for future research. However, the biological causes of age associated cognitive decline are not yet, well understood. In the current review, we outline the role of inflammation in cognitive aging and describe the role of several inflammatory processes, including inflamm-aging, vascular inflammation, and neuroinflammation which have both direct effect on brain function and indirect effects on brain function via changes in cardiovascular function.
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Affiliation(s)
| | - Con Stough
- Centre for Human Psychopharmacology, Swinburne University of Technology, Melbourne, VIC, Australia
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13
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Radu BM, Epureanu FB, Radu M, Fabene PF, Bertini G. Nonsteroidal anti-inflammatory drugs in clinical and experimental epilepsy. Epilepsy Res 2017; 131:15-27. [DOI: 10.1016/j.eplepsyres.2017.02.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 01/04/2017] [Accepted: 02/07/2017] [Indexed: 01/01/2023]
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14
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Barakat R, Redzic Z. The Role of Activated Microglia and Resident Macrophages in the Neurovascular Unit during Cerebral Ischemia: Is the Jury Still Out? Med Princ Pract 2016; 25 Suppl 1:3-14. [PMID: 26303836 PMCID: PMC5588523 DOI: 10.1159/000435858] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Accepted: 06/10/2015] [Indexed: 12/13/2022] Open
Abstract
Paracrine signaling in the neurovascular unit (NVU) is aimed to adjust the supply of oxygen and nutrients to metabolic demands of the brain in a feed-forward manner. Cerebral ischemia (CI) severely disrupts this homeostatic mechanism and also causes activation of microglia and resident macrophages in the brain. Contradictory data exist on the time pattern of microglial activation and polarization during CI, on molecular mechanisms that trigger them and on effects of microglia-derived cytokines on brain cells. It appears that conditions that occur during transient ischemia or in the penumbra of focal ischemia in vivo or equivalent conditions in vitro trigger polarization of resting microglia/macrophages into the M2 phenotype, which mainly exerts anti-inflammatory and protective effects in the brain, while prolonged ischemia with abundant necrosis promotes microglial polarization into the M1 phenotype. During the later stages of recovery, microglia that polarized initially into the M2 phenotype can shift into the M1 phenotype. Thus, it appears that cells with both phenotypes are present in the affected area, but their relative amount changes in time and probably depends on the proximity to the ischemic core. It was assumed that cells with the M1 phenotype exert detrimental effects on neurons and contribute to the blood-brain barrier opening. Several M1 phenotype-specific cytokines exert protective effects on astrocytes, which could be important for reactive gliosis occurring after ischemia. Thus, whether or not suppression of microglial activity after CI is beneficial for neurological outcome still remains unclear and current evidence suggests that no simple answer could be given to this question.
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Affiliation(s)
| | - Zoran Redzic
- *Dr. Zoran Redzic, Department of Physiology, Faculty of Medicine, Kuwait University, PO Box 24923, Safat 13110 (Kuwait), E-Mail
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15
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Radu BM, Banciu A, Banciu DD, Radu M. Acid-Sensing Ion Channels as Potential Pharmacological Targets in Peripheral and Central Nervous System Diseases. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2015; 103:137-67. [PMID: 26920689 DOI: 10.1016/bs.apcsb.2015.10.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Acid-sensing ion channels (ASICs) are widely expressed in the body and represent good sensors for detecting protons. The pH drop in the nervous system is equivalent to ischemia and acidosis, and ASICs are very good detectors in discriminating slight changes in acidity. ASICs are important pharmacological targets being involved in a variety of pathophysiological processes affecting both the peripheral nervous system (e.g., peripheral pain, diabetic neuropathy) and the central nervous system (e.g., stroke, epilepsy, migraine, anxiety, fear, depression, neurodegenerative diseases, etc.). This review discusses the role played by ASICs in different pathologies and the pharmacological agents acting on ASICs that might represent promising drugs. As the majority of above-mentioned pathologies involve not only neuronal dysfunctions but also microvascular alterations, in the next future, ASICs may be also considered as potential pharmacological targets at the vasculature level. Perspectives and limitations in the use of ASICs antagonists and modulators as pharmaceutical agents are also discussed.
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Affiliation(s)
- Beatrice Mihaela Radu
- Department of Neurological and Movement Sciences, Section of Anatomy and Histology, University of Verona, Verona, Italy; Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Adela Banciu
- Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Daniel Dumitru Banciu
- Department of Anatomy, Animal Physiology and Biophysics, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Mihai Radu
- Department of Neurological and Movement Sciences, Section of Anatomy and Histology, University of Verona, Verona, Italy; Department of Life and Environmental Physics, 'Horia Hulubei' National Institute for Physics and Nuclear Engineering, Magurele, Romania.
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16
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Radu BM, Radu M, Tognoli C, Benati D, Merigo F, Assfalg M, Solani E, Stranieri C, Ceccon A, Fratta Pasini AM, Cominacini L, Bramanti P, Osculati F, Bertini G, Fabene PF. Are they in or out? The elusive interaction between Qtracker®800 vascular labels and brain endothelial cells. Nanomedicine (Lond) 2015; 10:3329-42. [DOI: 10.2217/nnm.15.120] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Aim: Qtracker®800 Vascular labels (Qtracker®800) are promising biomedical tools for high-resolution vasculature imaging; their effects on mouse and human endothelia, however, are still unknown. Materials & methods: Qtracker®800 were injected in Balb/c mice, and brain endothelium uptake was investigated by transmission electron microscopy 3-h post injection. We then investigated, in vitro, the effects of Qtracker®800 exposure on mouse and human endothelial cells by calcium imaging. Results: Transmission electron microscopy images showed nanoparticle accumulation in mouse brain endothelia. A subset of mouse and human endothelial cells generated intracellular calcium transients in response to Qtracker®800. Conclusion: Qtracker®800 nanoparticles elicit endothelial functional responses, which prompts biomedical safety evaluations and may bias the interpretation of experimental studies involving vascular imaging.
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Affiliation(s)
- Beatrice Mihaela Radu
- Section of Anatomy & Histology, Department of Neurological & Movement Sciences, University of Verona, Verona 37134, Italy
- Department of Anatomy, Animal Physiology & Biophysics, Faculty of Biology, University of Bucharest, Bucharest 050095, Romania
| | - Mihai Radu
- Section of Anatomy & Histology, Department of Neurological & Movement Sciences, University of Verona, Verona 37134, Italy
- Department of Life & Environmental Physics, ‘Horia Hulubei’ National Institute for Physics & Nuclear Engineering, Magurele 077125, Romania
| | - Cristina Tognoli
- Section of Anatomy & Histology, Department of Neurological & Movement Sciences, University of Verona, Verona 37134, Italy
| | - Donatella Benati
- Section of Anatomy & Histology, Department of Neurological & Movement Sciences, University of Verona, Verona 37134, Italy
| | - Flavia Merigo
- Section of Anatomy & Histology, Department of Neurological & Movement Sciences, University of Verona, Verona 37134, Italy
| | - Michael Assfalg
- Department of Biotechnology, University of Verona, Verona 37134, Italy
| | - Erika Solani
- Section of Internal Medicine, Department of Medicine, University of Verona, Verona 37134, Italy
| | - Chiara Stranieri
- Section of Internal Medicine, Department of Medicine, University of Verona, Verona 37134, Italy
| | - Alberto Ceccon
- Department of Biotechnology, University of Verona, Verona 37134, Italy
| | | | - Luciano Cominacini
- Section of Internal Medicine, Department of Medicine, University of Verona, Verona 37134, Italy
| | | | - Francesco Osculati
- Section of Anatomy & Histology, Department of Neurological & Movement Sciences, University of Verona, Verona 37134, Italy
- IRCCS Centro Neurolesi ‘Bonino Pulejo’, Messina, Italy
| | - Giuseppe Bertini
- Section of Anatomy & Histology, Department of Neurological & Movement Sciences, University of Verona, Verona 37134, Italy
| | - Paolo Francesco Fabene
- Section of Anatomy & Histology, Department of Neurological & Movement Sciences, University of Verona, Verona 37134, Italy
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17
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Fonseca ACR, Resende R, Cardoso SM, Pereira CF. The role of proteotoxic stress in vascular dysfunction in the pathogenesis of Alzheimer’s disease. ENDOPLASMIC RETICULUM STRESS IN DISEASES 2015. [DOI: 10.1515/ersc-2015-0005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractAlzheimer’s disease (AD) is the principal cause of dementia in the elderly; however, its prevalence is increasing due to the fact that current pharmaceuticals used to manage the symptoms are not capable of preventing, halting, or reversing disease progression. In the last decade, evidence has accumulated to support the hypothesis that a primary cerebral vascular dysfunction initiates the cascade of events that leads to neuronal injury and the subsequent cognitive decline observed in AD. The mechanisms underlying these vascular defects and their relationship with neurodegeneration are still poorly understood however. It is pathologically known that cerebrovascular dysfunctions can induce the deposition of amyloid-β (Aβ), an amyloidogenic and toxic peptide that in turn causes cerebrovascular degeneration. Mammalian cells regulate proteostasis and the functioning of intracellular organelles through diverse mechanisms such as the Unfolded Protein Response, the Ubiquitin-Proteasome System and autophagy; however, when these mechanisms cannot compensate for perturbations in homeostasis, the cell undergoes programmed death via apoptosis. This review summarizes recent studies that together correlate the deregulation of protein quality control pathways with dysfunction of vascular endothelial cells of the brain in AD, thus supporting the hypothesis that it is the vicious, progressive failure of the proteostatic network and endothelial activation that underlies the cerebrovascular changes that symptomize AD.
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18
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Ichnocarpus frutescens Ameliorates Experimentally Induced Convulsion in Rats. INTERNATIONAL SCHOLARLY RESEARCH NOTICES 2014; 2014:434179. [PMID: 27379268 PMCID: PMC4897577 DOI: 10.1155/2014/434179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 09/10/2014] [Indexed: 11/24/2022]
Abstract
The present study was carried out to evaluate the anticonvulsant activity and probable mechanism of action of the methanol root extract from I. frutescens (MEIF) using different experimental animal models. Anticonvulsant activity of the single dose of MEIF (100, 200, and 400 mg/kg, p.o.) was evaluated in maximal electroshock- (MES-), pentylenetetrazole- (PTZ-), and isoniazid- (INH-) induced convulsions models in rats. The levels of γ-amino butyric acid (GABA), glutamate, GABA-transaminase (GABA-T) activity and oxidative stress markers were measured in pretreated rat's brain homogenate to corroborate the mechanism of observed anticonvulsant activity. MEIF (200–400 mg/kg, p.o.) protected the animals in all the behavioral models used. Pretreatment of MEIF (200–400 mg/kg, p.o.) and diazepam (1.0 mg/kg, i.p.) to the animals in INH-induced convulsion model showed 100% and 80% protection, respectively, as well as significant restoration of GABA and glutamate level in the rat's brain. MEIF and vigabatrin (50 mg/kg, i.p.) reduced the PTZ-induced increase in the activity of GABA-T (46%) in the brain. Further, MEIF reversed the PTZ-induced increase in lipid peroxidase (LPO) and decrease in reduced glutathione (GSH), catalase (CAT), and superoxide dismutase (SOD) activities. The findings of this study validate the anticonvulsant activity of I. frutescens.
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