EFFECTS OF HYPOTHALAMIC EXTRACT AND STEROIDS ON THE SECRETION OF PROLACTIN, GROWTH HORMONE AND LUTEINIZING HORMONE BY THE PITUITARY GLAND OF THE TERRAPIN (CHRYSEMYS PICTA) IN VITRO

1 January 1978

journal article
research article
Published by Bioscientifica in Journal of Endocrinology

Vol. 76 (1) , 169-170
https://doi.org/10.1677/joe.0.0760169

Abstract

Pituitary glands were incubated with 25 .mu.g progesterone, 25 .mu.g testosterone, 25 ng estradiol-17.beta., an amount of hypothalamic extract (HE) equivalent to 1 hypothalamus or 1 of the steroids plus HE. All 3 steroids significantly (P < 0.05) stimulated the secretion of LH [luteinizing hormone], compared with results obtained from incubation in Medium 199 alone. In C. picta the secretion of prolactin and GH [growth hormone] in vitro is influenced by hypothalamic releasing factors. Progesterone, estradiol-17.beta. and testosterone also act alone to influence the secretion of pituitary hormones in vitro.

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