Vascular Cell Senescence Contributes to Blood-Brain Barrier Breakdown

Stroke; a Journal of Cerebral Circulation
Yu YamazakiTakahisa Kanekiyo

Abstract

Age-related changes in the cerebrovasculature, including blood-brain barrier (BBB) disruption, are emerging as potential risks for diverse neurological conditions. Because the accumulation of senescent cells in tissues is increasingly recognized as a critical step leading to age-related organ dysfunction, we evaluated whether senescent vascular cells are associated with compromised BBB integrity. Effects of vascular cell senescence on tight junction and barrier integrity were studied using an in vitro BBB model, composed of endothelial cells, pericytes, and astrocytes. In addition, tight junction coverage in microvessels and BBB integrity in BubR1 hypomorphic (BubR1(H/H)) mice, which display senescence cell-dependent phenotypes, were examined. When an in vitro BBB model was constructed with senescent endothelial cells and pericytes, tight junction structure and barrier integrity (evaluated by transendothelial electric resistance and tracer efflux assay using sodium fluorescein and Evans blue-albumin were significantly impaired. Endothelial cells and pericytes from BubR1(H/H) mice had increased senescent-associated β-galactosidase activity and p16(INK4a) expression, demonstrating an exacerbation of senescence. The coverage by ti...Continue Reading

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