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• W1983263104 abstract "We recently demonstrated that neuropeptide Y (NPY) potentiates the ability of pulsatile LHRH infusions to restore LH surges in pentobarbital (PB)-blocked, proestrous rats. In the present study we determined if specific endocrine conditions are necessary for the expression of these direct pituitary effects of NPY. Facilitatory actions of NPY were examined in the absence of gonadal feedback [ovariectomy (OVX)], in the presence of negative gonadal feedback (metestrus), after estrogen priming of the pituitary gland [OVX plus 30 micrograms estradiol benzoate (EB) 2 days before experiments], and after treatments which evoke preovulatory-like LH surges (OVX plus EB and 5 mg progesterone or P the morning of experiments). Rats received jugular catheter implants the day before experiments. On the day of experiments, hourly blood samples were taken from 1100-2100 h. At 1330 h, rats received injections of PB to block endogenous LHRH release, or saline. Every 30 min from 1400-1800 h, PB-treated rats received iv pulses of LHRH (15 ng/pulse) or saline, along with concurrent pulses of NPY (1 or 5 micrograms/pulse) or saline. Plasma samples were analyzed by LH RIA. In all cases, pulsatile administration of 15 ng LHRH resulted in plasma LH levels that were significantly elevated above saline-treated, PB-blocked controls. Only in the case of EB+P-treated rats did coadministration of 5 micrograms NPY along with LHRH significantly enhance LHRH-stimulated LH secretion (P < 0.001). NPY had no effect on LHRH-stimulated LH secretion in OVX, OVX + EB-treated, or metestrous rats. Pulsatile administration of either dose of NPY alone did not stimulate LH release in any of the four groups examined. These results demonstrate that the facilitatory effects of NPY on LHRH-stimulated LH secretion can be manifest only under the endocrine conditions required to produce full, preovulatory-like LH surges, i.e. after estrogen and P treatment." @default.
• W1983263104 created "2016-06-24" @default.
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• W1983263104 date "1992-12-01" @default.
• W1983263104 modified "2023-10-10" @default.
• W1983263104 title "Neuropeptide Y potentiates luteinizing hormone (LH)-releasing hormone-induced LH secretion only under conditions leading to preovulatory LH surges." @default.
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• W1983263104 doi "https://doi.org/10.1210/endo.131.6.1446632" @default.
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