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In vivo and in vitro studies on endothelial regeneration.

Endothelial regeneration was studied in rabbit aorta after intra-arterial balloon catheterization. Most of the regenerated endothelium originated from existing branches which was assessed by the Evans-blue uptake pattern and confirmed by transmission and scanning electron microscopy. Glucocorticoid treatment enhanced re-endothelialization whereas hyperlipemic diet inhibited. Sera from minipigs fed an atherogenic diet consistently have less ability than sera from control pigs to stimulate in vitro the regeneration of wounded endothelium-like monolayers of 3T3-B cells. The deficiency is probably due to an inhibitor which appears and disappears with changes in the diet.