Abstract
Significant increases in basal, and glucagon and fluoride stimulated adenylate cyclase activity were observed in liver plasma membranes of hypophysectomized rats compared to normal adult and weanling rats. The fluoride stimulated adenylate cyclase activity was 2-3 fold greater in the membranes from hypophysectomized animals while the glucagon stimulated activity was 5-7 fold greater, and the basal activity was approximately double that of membranes from normal adult animals. Administration of growth hormone to hypophysectomized rats by an intramuscular or intravenous route decreased adenylate cyclase activity to levels equivalent to those in normal adult rats. Estradiol and thyroxine replacement did not alter the adenylate cyclase activity of the membranes from hypophysectomized animals. The fluoride or epinephrine stimulated adenylate cyclase activity of rat diaphragm homogenates was not affected by hypophysectomy.
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