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Brain microvascular pericytes in health and disease

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Abstract

Pericytes are located at periphery of the microvessel wall and wrap it with their processes. They communicate with other cells of the neurovascular unit by direct contact or through signaling pathways and regulate several important microcirculatory functions. These include development and maintenance of the blood–brain barrier (BBB), distribution of the capillary blood flow to match the local metabolic need of the nearby cells, and angiogenesis. Pericytes also exhibit phagocytic activity and may function as pluripotent stem cells. Increasing evidence suggests a role for pericytes in a wide range of CNS diseases. They appear to be vulnerable to oxygen and nitrogen radical toxicity and have been shown to contract during cerebral ischemia and remain contracted despite reopening of the occluded artery. This causes impaired re-flow and may diminish the benefit of re-canalization therapies in stroke patients. Hyperglycemia-induced dysfunction of the signaling pathways between pericytes and endothelia is thought to play an important role in diabetic retinopathy, a common cause of blindness. Amyloid deposits detected within degenerating pericytes in the brains of patients with Alzheimer’s disease suggest that pericyte dysfunction may play a role in cerebral hypoperfusion and impaired amyloid β-peptide clearance in Alzheimer’s disease. This exciting possibility may reveal a novel temporal sequence of events in chronic neurodegeneration, in which microvascular dysfunction due to pericyte degeneration initiates secondary neurodegenerative changes. Identification of molecular mechanisms by which pericytes regulate BBB integrity in inflammatory conditions as well as in vasogenic brain edema may lead to new treatments. Pericytes may also take part in tissue repair and vascularization after CNS injury. In conclusion, although the evidence is just emerging and mostly preliminary, disclosing pericytes’ role in the pathophysiology of CNS diseases may yield exciting developments and novel treatments.

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Acknowledgments

Work in the authors’ laboratories is supported by The Turkish Academy of Sciences (T.D. and Y.G.-O.), Hacettepe University Research Fund 0401105001 (T.D.), Scientific and Technical Research Council of Turkey 104S254 (Y.G.-O.), and Brain Research Association (M.Y.). Authors are grateful to Kivilcim Kilic for her expert help with preparing the figures.

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  1. Department of Neurology, Faculty of Medicine and, Institute of Neurological Sciences and Psychiatry, Hacettepe University, Sihhiye, Ankara, Turkey

    Turgay Dalkara, Yasemin Gursoy-Ozdemir & Muge Yemisci

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  1. Turgay Dalkara
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  2. Yasemin Gursoy-Ozdemir
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Correspondence to Turgay Dalkara.

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Dalkara, T., Gursoy-Ozdemir, Y. & Yemisci, M. Brain microvascular pericytes in health and disease. Acta Neuropathol 122, 1–9 (2011). https://doi.org/10.1007/s00401-011-0847-6

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