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10.1172/JCI154118
1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
2Department of Pharmacology, University of Oxford, Oxford, United Kingdom
3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
2Department of Pharmacology, University of Oxford, Oxford, United Kingdom
3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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Ilkan, Z.
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1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
2Department of Pharmacology, University of Oxford, Oxford, United Kingdom
3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
2Department of Pharmacology, University of Oxford, Oxford, United Kingdom
3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
2Department of Pharmacology, University of Oxford, Oxford, United Kingdom
3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
2Department of Pharmacology, University of Oxford, Oxford, United Kingdom
3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
2Department of Pharmacology, University of Oxford, Oxford, United Kingdom
3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
2Department of Pharmacology, University of Oxford, Oxford, United Kingdom
3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
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3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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1Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom
2Department of Pharmacology, University of Oxford, Oxford, United Kingdom
3Center for Regenerative Medicine (CReM), Boston University School of Medicine, Boston, United States of America
4Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, United Kingdom
5Department of Biostatistics and Epidemiology, Imperial College London, London, United Kingdom
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Published March 22, 2022 - More info
Pericyte-mediated capillary constriction decreases cerebral blood flow in stroke after an occluded artery is unblocked. The determinants of pericyte tone are poorly understood. We show that a small rise in cytoplasmic Ca2+ concentration ([Ca2+]i) in pericytes activates chloride efflux through the Ca2+-gated anion channel TMEM16A, thus depolarizing the cell and opening voltage-gated calcium channels. This mechanism strongly amplifies the pericyte [Ca2+]i rise and capillary constriction evoked by contractile agonists and ischemia. In a rodent stroke model, TMEM16A inhibition slows the ischemia-evoked pericyte [Ca2+]i rise, capillary constriction and pericyte death, reduces neutrophil stalling and improves cerebrovascular reperfusion. Genetic analysis implicates altered TMEM16A expression in poor patient recovery from ischemic stroke. Thus, pericyte TMEM16A is a crucial regulator of cerebral capillary function, and a potential therapeutic target for stroke and possibly other disorders of impaired microvascular flow, such as Alzheimer’s disease and vascular dementia.