Abstract
Some properties of immunoreactive estradiol secreted by adrenals and ovaries of immature female rats were studied. It was shown that adrenals and ovaries of 15-day-old animals secrete approximately equal amounts of immunoreactive estradiol, with thin-layer chromatogram of immunoreactive material being identical for both glands. Adrenal- as well as ovarian-derived estradiol can bind to uterine cytosol estradiol receptors with the formation of complexes, which can be activated in the cell-free system. The removal of either adrenals or ovaries causes a decrease of cytosol estradiol receptor levels in the uterus 6 hours after the operation. From these results and previously reported data, nothing suggests that immunoreactive estradiol secreted by the adrenals of immature rats should be regarded as a “spurious” hormone.
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