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- W2029100518 abstract "It is established that the blockade of the pituitary LHRH receptor by an LHRH antagonist will suppress pituitary LH secretion and reduce serum concentrations of gonadal steroids. Little is known, however, about the activity of the LHRH/LH pulse generator during this inhibitory period or during the recovery phase. To investigate this, a potent LHRH antagonist [N-Ac-D-pCl-Phe1,D-pCl-Phe2,D-Trp3,D-hArg(Et2)6, D-Ala10 LHRH was injected iv into sexually active rams and the changes in the blood plasma concentrations of LH, FSH, testosterone, and PRL were measured in samples collected every 15 min for 24–48 h. The treatment induced an immediate blockade of pulsatile LH secretion and a parallel decline in blood levels of testosterone. Plasma levels of FSH were not suppressed by treatment with the LHRH antagonist and there was no consistent effect on plasma levels of PRL. The duration of the inhibition of LH was dose dependent lasting 4.3 ± 0.4 h, 18.0 ± 1.0 h, and 31.8 ± 1.3 h for the low (6 μg/kg), medium (36 μg/kg), and high (365 μg/kg) doses of LHRH antagonist, respectively. During the recovery period there was an approximate 2-fold increase in the frequency of LH pulses. These results suggest a compensatory response to the decline in the negative feedback effect of testosterone secretion. Even the lowest dose of antagonist elicited a decrease in the level of testosterone and an increase in LH pulse frequency. At this dose, the decline in testosterone was very transitory indicating an acute sensitivity of the hypothalamus to changes in the negative feedback signal. These results suggest that the suppression of LH and testosterone secretion in the ram by LHRH antagonist is associated with a compensatory increase in the activity of the LHRH pulse generator. (Endocrinology120: 2245–2250, 1987)" @default.
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- W2029100518 date "1987-06-01" @default.
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- W2029100518 title "Compensatory Response of the Luteinizing-Hormone (LH)-Releasing Hormone (LHRH)/LH Pulse Generator after Administration of a Potent LHRH Antagonist in the Ram" @default.
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- W2029100518 doi "https://doi.org/10.1210/endo-120-6-2245" @default.
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