The preovulatory rise of ovarian ornithine decarboxylase is required for progesterone secretion by the corpus luteum.

Abstract:

:Ovarian progesterone secretion during the diestrus stage of the estrous cycle is produced by luteal cells derived from granulosa and thecal cells after the differentiation process that follows ovulation. Our results show that blockade of the preovulatory rise of ovarian ornithine decarboxylase (ODC), a key enzyme in polyamine biosynthesis, by treatment with the specific inhibitor alpha-difluoromethylornithine (DFMO) leads to a significant decrease in the ovarian progesterone content and a dramatic fall in the plasma levels of this hormone during the following diestrus. The same inhibition was produced in spite of the fact that both luteinizing and follicle stimulating hormones were given concomitantly with DFMO. On the other hand, the acute rise in the plasma progesterone levels observed after administration of human chorionic gonadotropin to mice at different periods of the estrous cycle was not affected by DFMO administration. Our results indicate that although elevated levels of ODC are not required for acute ovarian steroidogenesis, the preovulatory peak of ovarian ODC activity observed in the evening of proestrus may be critical for the establishment of a constitutive steroidogenic pathway and progesterone secretion by the corpus luteum during the diestrus stage of the murine estrous cycle.

authors

Bastida CM,Tejada F,Cremades A,Peñafiel R

doi

10.1016/S0006-291X(02)00191-2

subject

Has Abstract

pub_date

2002-04-26 00:00:00

pages

106-11

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(02)00191-2

journal_volume

293

pub_type

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