Regulation of enzyme turnover during tissue differentiation. Interactions of insulin, prolactin and cortisol in controlling the turnover of fatty acid synthetase in rabbit mammary gland in organ culture.
1. Explants of mammary gland from mid-pregnant rabbits were cultured in Medium 199 containing combinations of insulin, prolactin and cortisol. With hormone combinations which included prolactin, a sustained increase in the apparent rate of synthesis and in the amount of fatty acid synthetase was measurable immunologically. Maximum increase was produced with… (More)