Morphine-induced prolactin release precedes a down-regulation of prolactin receptors in the male rat choroid plexus and hypothalamus.

Abstract:

:In previous studies we provided evidence for changes in prolactin (PRL) receptor levels in the male rat brain after continuously infusing morphine using subcutaneously implanted miniosmotic pumps. In this work we have studied the binding of PRL in the male rat brain following morphine administration by both subcutaneous (s.c.) and intracerebroventricular (i.c.v.) injections. The binding in the choroid plexus and the hypothalamus was measured using iodinated ovine PRL (oPRL) as a radiolabel. The results indicated that the density of the PRL-binding sites in the hypothalamus and the choroid plexus were significantly decreased 4 h and 24 h after s.c. injections, and also 30 min and 4 h after i.c.v. injections. However, no decrease in PRL-binding was observed 15 min after i.c.v. injection of morphine. The plasma levels of PRL were measured by radioimmunoassay (RIA) and were found to be significantly increased after 30 min and 4 h in all treated animals. Following i.c.v. injection a significant increase in plasma PRL was observed after just 15 min. It was suggested that the down-regulation in PRL binding to some extent at least resulted from receptor overstimulation caused by the morphine-induced elevation in the concentrations of the endogenous hormone.

journal_name

Neurosci Res

journal_title

Neuroscience research

authors

Lai Z,Zhai Q,Liu Z,Roos P,Nyberg F

doi

10.1016/0168-0102(95)00953-1

subject

Has Abstract

pub_date

1995-10-01 00:00:00

pages

313-6

issue

3

eissn

0168-0102

issn

1872-8111

pii

0168-0102(95)00953-1

journal_volume

23

pub_type

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