Abstract
1. 1. Estradiol induces vitellogenin synthesis in liver cultures taken from normal and ovariectomized female turtles. 2. 2. By contrast, estradiol alone or with other hormonal or serum factors failed to induce vitellogenin synthesis in liver cultures established from normal and castrated males. 3. 3. In vitro induction of vitellogenesis was achieved only in cultures originated from hypophysectomized males and in the presence of both estradiol and mammalian growth hormone. 4. 4. These results demonstrated a clear sex difference in the hormonal stimuli required, in vitro, for the induction of vitellogenesis in the turtle. 5. 5. We suggest that pituitary growth hormone is an important synergist in the vitellogenic response to estrogen, possibly through an effect on estrogen receptors.
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