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Ovarian cAMP and cGMP fluctuations in the hamster during the oestrous cycle

Summary. Cyclic GMP, cAMP and total DNA levels were determined in whole hamster ovaries on each day of the 4-day cycle. Pro-oestrous ovaries were removed during the time of the preovulatory LH surge (confirmed by RIA). Cyclic AMP levels (pmol/mg DNA) were highest during pro-oestrus (1268·0 ± 139 (s.e.m.)) and lowest during dioestrus 2 (266·9 ± 22). Cyclic GMP (pmol/mg DNA) levels were highest at dioestrus 2 (87·2 ± 19) and lowest during oestrus (11·9 ± 2). Similar patterns were obtained with total pmol/4 ovaries. However expressed, there was an inverse correlation of cAMP and cGMP at dioestrus 2 (P < 0·02) and pro-oestrus (P < 0·001). Cyclic GMP was inversely correlated with total DNA levels (P < 0·02) at oestrus and dioestrus 2.

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