Microembolus clearance through angiophagy is an auxiliary mechanism preserving tissue perfusion in the rat brain.

Acta Neuropathologica Communications
Anne-Eva van der WijkEd van Bavel

Abstract

Considering its intolerance to ischemia, it is of critical importance for the brain to efficiently process microvascular occlusions and maintain tissue perfusion. In addition to collateral microvascular flow and enzymatic degradation of emboli, the endothelium has the potential to engulf microparticles and thereby recanalize the vessel, through a process called angiophagy. Here, we set out to study the dynamics of angiophagy in relation to cytoskeletal remodeling in vitro and reperfusion in vivo. We show that polystyrene microspheres and fibrin clots are actively taken up by (brain) endothelial cells in vitro, and chart the dynamics of the actin cytoskeleton during this process using live cell imaging. Whereas microspheres were taken up through the formation of a cup structure by the apical endothelial membrane, fibrin clots were completely engulfed by the cells, marked by dense F-actin accumulation surrounding the clot. Both microspheres and fibrin clots were retained in the endothelial cells. Notably, fibrin clots were not degraded intracellularly. Using an in vivo microembolization rat model, in which microparticles are injected into the common carotid artery, we found that microspheres are transported by the endothelium fro...Continue Reading

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Citations

Mar 26, 2021·Journal of Stroke and Cerebrovascular Diseases : the Official Journal of National Stroke Association·Theodosia GeorgakopoulouUNKNOWN INSIST investigators
Aug 20, 2021·Frontiers in Cell and Developmental Biology·Jiahong SunRachita K Sumbria

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Methods Mentioned

BETA
transfection

Software Mentioned

GraphPad Prism
FIJI
LAS X
GraphPad
Huygens Professional

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