Pericyte (brain)

Pericytes are contractile mural cells wrapped around the microvessels of the brain, critical for regulating cerebral blood flow, stabilizing developing blood vessels, and maintaining the blood–brain barrier. Their contractility is mediated by actin–myosin machinery, with α-smooth muscle actin and myosin II as key proteins, and is regulated by diverse extracellular signals including neurotransmitters, endothelin, prostaglandins, and nitric oxide. Rather than a specific molecular target, "brain pericyte contractility" is a function supported by multiple cellular pathways and protein complexes. The relevance to disease and therapy arises from pericytes’ roles in microvascular blood flow regulation, neurovascular coupling, and blood–brain barrier integrity—impaired pericyte function contributes to neurodegeneration, vascular dementia, stroke, and blood–brain barrier dysfunction. As such, drug targeting focuses on molecular modulators of pericyte contraction/relaxation, not the contractile machinery itself.

Other names

Perivascular cell (brain)Rouget cell (historical)Neurovascular unit pericyte

Alteration of pericyte contraction or relaxation via modulation of intracellular calcium, various signaling pathways (endothelin, adenosine, prostaglandin, nitric oxide, Rho kinase, PDGF)