Abstract
We investigated the in virto effects (kinetics and dose-response) of adrenal and sexual steroid hormones on the secretion of thymulin, a thymic hormone, by human thymic epithelial cells in primary cultures as well as in a rat epithelial cell line. We demonstrated that all steroids tested, in a range of physiological doses, stimulated thymulin production to various extents. Progesterone and estradiol, however, were revealed to be the most efficient. Specific steroid antagonists abrogated the steroid-induced stimulation of thymulin production. These findings confirm our previous in vivo results and demonstrate that steroid hormones can act directly on thymic epithelial cells to modulate their endocrine production.
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