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The Inhibitory Effect of PACAP38 on Ovulation is Mediated by CRF and Endogenous Opioids

In our previous experiments 1,2 it was demonstrated that PACAP38 given intracerebroventricularly ( icv ), before the critical period of the proestrous stage, was able to block the expected ovulation and the preovulatory LH surge, whereas intravenous ( i.v. ) administration had no inhibitory effect. It was concluded that the inhibitory effect of PACAP38 on the ovulation might be mediated via the hypothalamus rather than directly through the pituitary gland. In the work reported here our aim was to elucidate these factors.