Prolactin receptor regulation by LH in the rat mammary gland.

Abstract:

:The aim of this study was to investigate hormonal factors responsible for the huge increase in PRL receptors on the day of estrus in the rat mammary gland. For this purpose, ovariectomized rats were primed with E2 so as to reach a physiological serum concentration of E2 (21.5 +/- 1.2 pg/ml) and high PRL serum values (72.8 +/- 21.9 ng/ml). In these conditions, PRL specific binding and capacity were respectively 22.8 +/- 8.3%/mg protein and 96 +/- 29 fm/mg protein. An injection of either LHRH (500 ng/rat) or LH (60 micrograms LH-RP1/rat) was capable of increasing significantly both PRL specific binding and capacity. Capacity reached the values of 498 +/- 103 and 507 +/- 240 fm/mg protein for LHRH and LH respectively. LHRH action appeared to be mainly mediated through LH secretion, since no difference was found between LHRH and LH. LHRH and LH injections alone were unable to modify PRL binding, suggesting that they only potentiate E2 and PRL action. These results show for the first time that LH is involved in the regulation of PRL receptors in the rat mammary gland.

authors

Guillaumot P,Sabbagh I,Bertrand J,Cohen H

doi

10.1016/0006-291x(86)91038-7

subject

Has Abstract

pub_date

1986-03-28 00:00:00

pages

1076-83

issue

3

eissn

0006-291X

issn

1090-2104

pii

0006-291X(86)91038-7

journal_volume

135

pub_type

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