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[The morphological and functional characteristics of human aortic endothelium. II. Cellular polymorphism and the incorporation of 3H-thymidine in a culture].

The content of multinuclear endothelial cells and the ability of cells to incorporate 3H-thymidine were studied in primary cultures isolated from zones of low (LP) and high (HP) probability of atherosclerosis of adult human aortas. It was found that the percentage of multinuclear EC was at mean 2-fold higher in cultures from HP zones compared to LP zones of the same vessels. In primary cultures and in the first passage cultures only small mononuclear EC were able to incorporate 3H-thymidine. A significant decrease in the thymidine index (TI) was found only in cultures from HP zones of atherosclerotic aortas. In cultures of EC from the LP zones of these aortas the TI was as high as in cultures from the LP and HP zones from grossly normal vessels.