Comparison of acute effects of dynorphin and beta-endorphin on prolactin release in the rat

Endocrinology
D Van VugtJ Meites

Abstract

The ability of dynorphin and beta h-endorphin (beta h-EP) to stimulate prolactin (PRL) release in male rats was examined. Rats were injected intraventricularly with either 1 or 10 microgram dynorphin, 1 or 10 microgram beta h-EP, 10 microgram dynorphin together with 20 microgram naloxone (NAL), or an equivalent volume (13 microliter) of saline. Dynorphin caused a dose-dependent release of PRL which was significant 10 min after injection but not at later sampling times. beta h-EP also increased serum PRL levels and maintained elevated PRL levels for at least 60 min. NAL, a specific opiate antagonist, completely blocked dynorphin-induced PRL release. These results indicate that dynorphin is a potent stimulator of PRL release, but its stimulatory activity is transient relative to the activity exhibited by beta h-EP. Furthermore, dynorphin's action is specific since NAL completely blocked dynorphin induced PRL release.

Citations

Jan 1, 1987·Journal of Steroid Biochemistry·P LimontaF Piva
Nov 1, 1982·Peptides·G A OlsonD H Coy
Jul 30, 1982·Biochemical and Biophysical Research Communications·N MatsushitaH Imura

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