Abstract
IT is now well established that progesterone can either facilitate or inhibit the effects of oestrogen on gonadotrophin release and behaviour1. Whether facilitation or inhibition is observed depends primarily on the time interval between exposure to oestrogen and progesterone, but the mechanism by which progesterone exerts these effects remains unknown. Attempts to demonstrate progesterone receptor sites within the brain and pituitary have given equivocal results2–10, leading to speculation that the central effects of progesterone may be mediated through a mechanism fundamentally different from that found in peripheral tissues1,2,6. More recently, however, several studies have suggested that oestrogen-inducible progestin receptor systems similar to those found in peripheral progesterone target tissues can be identified in the brain and pituitary if sufficiently sensitive and specific experimental procedures are used11–14. We summarise here work from our laboratory which indicates that, in the rat brain, there are in fact two anatomically distinct progestin receptor systems, one of which differs strikingly from the systems identified previously in neural and non-neural tissues in that it is apparently insensitive to oestrogen.
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MACLUSKY, N., MCEWEN, B. Oestrogen modulates progestin receptor concentrations in some rat brain regions but not in others. Nature 274, 276–278 (1978). https://doi.org/10.1038/274276a0
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DOI: https://doi.org/10.1038/274276a0
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