PMID: 9181487May 1, 1997Paper

Anterior pituitary release of prolactin is inhibited by exposure to short photoperiod

Journal of Neuroendocrinology
L L Badura, B D Goldman

Abstract

The potential regulatory sites responsible for the decrease of circulating prolactin (PRL) levels shown by many photoperiodic mammals following prolonged exposure to short days was investigated in Siberian hamsters that had been maintained under a stimulatory, long-day photoperiod, and in hamsters that had been shifted to a nonstimulatory, short-day photoperiod for 8-10 weeks. The ability of anterior pituitary fragments (AP) from each of these groups to release prolactin was evaluated in pituitary tissue cultured alone and also in pituitary tissue co-cultured with hypothalamic fragments (HF), using a perifusion tissue culture system. The perfusate from these cultures was collected every 1/2 h for 8 h, and was assayed for basal levels of prolactin using radioimmunoassay. For AP tissue cultured alone, there was a robust reduction in prolactin release by the fragments harvested from short-day housed animals. In AP tissue harvested from long-day exposed animals, co-culture with either long- or short-day HF did not induce significant changes in basal PRL release. Similarly, co-culture with short-day HF did not significantly alter PRL release in short-day APs. However, there was a significant increase in release when short-day APs we...Continue Reading

Citations

Oct 4, 2000·Physiological Reviews·M E FreemanG Nagy
Jun 17, 2005·Australian Veterinary Journal·R J BassettD C Robson
Jul 20, 2005·Annals of Medicine·Christian A Kell, Jörg H Stehle
Jul 23, 2011·Neuroendocrinology·Sandrine M Dupré
Jun 23, 2021·Zygote : the Biology of Gametes and Early Embryos·Huiliang XueLaixiang Xu

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