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Endocrinology, Vol 136, 1523-1529, Copyright © 1995 by Endocrine Society
ARTICLES |
F Bayard, S Clamens, F Meggetto, N Blaes, G Delsol and JC Faye
INSERM U397, Institut Louis Bugnard, CHU Rangueil, Toulouse, France.
To investigate the mechanisms by which estrogen hormones influence the vascular system, the metabolism of these hormones and the functionality of estrogen receptors were characterized in rat aortic smooth muscle cells from secondary cultures, a widely studied model of vascular biology. Aromatase, estradiol-17 beta-hydroxysteroid dehydrogenase and 17-ketoreductase enzyme activities were demonstrated in these cells. The presence of functional estrogen receptor could also be demonstrated by estrogen-induced transactivating ability in transfection experiments using the luciferase gene reporter and an estrogen responsive element as transcriptional enhancer although the amplitude of the response was only in the range of 140 to 150%. Immunocytochemical analyses, using monoclonal antibodies that recognize epitopes in the A/B domain of the molecule, showed a predominant cytoplasmic localization of these estrogen receptors, even after estrogen addition to the culture medium. Western blot analysis using antibodies that recognize epitopes in the A/B or F domain gave a mol wt of 67,000. Analysis of the estrogen receptor messenger RNA showed that there was no deletion of the proto- signals for nuclear accumulation. The aromatase and dehydrogenase activity results, coupled with the estrogen receptor immunological, RNA analysis, and transfection data strongly support the contention that rat aortic smooth muscle cells are estrogen target cells. This in vitro model is convenient for studying the mechanisms of action of estrogen hormones that seem very peculiar in this cell population.
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