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Cyclic and maturation-dependent regulation of follicle-stimulating hormone receptor and luteinizing hormone receptor messenger ribonucleic acid expression in the porcine ovary
Ist Teil von
Biology of reproduction, 1998-03, Vol.58 (3), p.648-658
Ort / Verlag
Madison, WI: Society for the Study of Reproduction
Erscheinungsjahr
1998
Quelle
MEDLINE
Beschreibungen/Notizen
We sought to characterize the ovarian expression of mRNAs for the receptors for FSH (FSHr) and LH (LHr) at the different stages
of the estrous cycle of the pig and to localize the receptor mRNAs to individual cell types in follicles and corpora lutea
as a function of their developmental status. Northern blot analyses indicated that multiple FSHr and LHr mRNA transcripts
occur on Days 0, 4, 7, 12, and 16 of the estrous cycle. In situ hybridization analyses revealed considerable cyclic variation
in expression among small, medium, and large follicles. In small follicles of both immature prepubertal ovaries and mature
adult ovaries at all days of the cycle studied, FSHr mRNA expression was strongly positive and was spatially restricted to
granulosa cells. FSHr mRNA expression was strongly positive in granulosa cells of medium follicles but had declined in granulosa
cells of mature follicles on Day 0. LHr expression in small follicles, in contrast, was spatially restricted to theca cells
and was estrous cycle-dependent. LHr expression in theca cells was weakly positive in small follicles on Days 12, 0, and 4,
was strongly positive in small follicles on Day 7 and in medium follicles on Days 12 and 16, and had declined in large mature
follicles on Day 0. LHr expression in granulosa cells was negative in small follicles on Days 4 and 7, weakly positive in
medium follicles on Days 12 and 16, and positive in large follicles on Day 0. In degenerating follicles, LHr mRNA was expressed
weakly in the theca cells, and FSHr mRNA expression in granulosa cells was absent. In the corpus luteum, FSHr mRNA was not
expressed, but LHr mRNA was expressed in some cells on Days 4 and 7, was expressed maximally on Day 12, and had declined partially
by Day 16. These studies indicate that there is maturation-dependent regulation of FSHr and LHr expression in the adult porcine
ovary. FSHr mRNA content decreases in parallel with FSHr protein content as follicles increase in size.