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. 1991 Apr;138(4):941–949.

Age-related decline in prostacyclin synthesis by human aortic endothelial cells. Qualitative and quantitative analysis.

O Tokunaga 1, T Yamada 1, J L Fan 1, T Watanabe 1
PMCID: PMC1886090  PMID: 1707240

Abstract

To investigate the functional alteration of human aortic endothelial cells with aging, prostacyclin synthesis was qualitatively and quantitatively examined. The endothelial cells of human aortas and umbilical veins or inferior vena cavae were immunohistochemically examined and found positive for prostacyclin, but the intensity of aortic endothelial cells from older subjects was low. In addition to the endothelial cells, smooth muscle cells in the thickened intima, not the media, of the aorta were also immunoreactive. Endothelial cells were successfully cultured from human aortas obtained from infants through aged subjects and were subdivided into three groups: young, middle, and old. Prostacyclin synthesis by endothelial cells from all types of blood vessels was extremely great at the primary culture, but decreased abruptly in the following subcultures. Among the aortic endothelial cells, the young group synthesized the largest amount of prostacyclin in a conventional culture condition, with synthesis progressively decreasing in the older groups. The in vitro prostacyclin biosynthesis was supported by the qualitative analysis on the tissue sections. These results indicate that prostacyclin synthesis of the aortic endothelial cells decreases with age, but intimal smooth muscle cells potentially have a back-up mechanism and substitute this synthesis to some extent. The decreased synthesis of prostacyclin with age may play an important role in the development and advancement of thrombosis and atherosclerosis.

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