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Estradiol (0.2 mug), injected subcutaneously for 10 days to adult male rats, increased plasma growth hormone (GH) levels as compared with oil-treated controls. In estradiol-pretreated (10 days), urethane-anesthetized rats, the first as well as the second of two successive intracarotid injections, at 1-hour intervals, of one rat stalk median eminence equivalent evoked a significant rise in plasma radioimmunoassayable GH. Under the same conditions, cerebral cortex extracts (1 equivalent) induced a slight elevation whereas vasopressin (30 mU) or serotonin (200 ng) were ineffective. These results indicate that estrogen-primed, urethane-anesthetized rats can be used to demonstrate GH-releasing activity in rat SME extracts.
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