Prolactin expresses differential effects on apoptotic cell death of luteal cells in vivo and in vitro.

Abstract:

:PRL surges in female rats have dual effects of luteal function: either inducing luteolysis during the estrous cycle or rescuing and maintaining luteal function during pseudopregnancy. We analyzed these apparent contradictory effects in relation to apoptosis. The detection of fragmented DNA and in situ 3'-end labeling studies were done on corpora lutea (CL) collected from cycling rats at proestrus 1800 h (P1800 specimen) or pseudopregnant rats on day 6 (psp 6). Distinct DNA ladders were observed in P1800 samples as we previously reported, but only slight ones were found in psp 6 specimen. The effect of PRL on the induction of apoptosis was evaluated in vitro with dispersed luteal tissue. CL from cycling rats were exempted from a PRL surge by pre-treating donors with a dopamine agonist. The extent of apoptotic reaction in P1800 specimen depended on the doses of PRL added to the culture medium. In psp 6 specimen, in contrast, PRL suppressed the apoptotic reaction, increased the cell survival rate (MTT assay), and decreased the cell death rate (LDH assay). Furthermore, PRL enhanced 20 alpha-hydroxysteroid dehydrogenase activity in P1800 specimen but suppressed it in psp 6 specimen. In summary, PRL in rats is either an apoptosis-inducer or -suppressor, depending on the functional state of luteal cells.

journal_name

Endocr J

journal_title

Endocrine journal

authors

Kanuka H,Matsuyama S,Ohnishi M,Matsumoto Y,Nishihara M,Takahashi M

doi

10.1507/endocrj.44.11

subject

Has Abstract

pub_date

1997-02-01 00:00:00

pages

11-22

issue

1

eissn

0918-8959

issn

1348-4540

journal_volume

44

pub_type

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