Mechanisms of action of transforming growth factor beta on the expression of follicle-stimulating hormone receptor messenger ribonucleic acid levels in rat granulosa cells.
Biol Reprod
; 69(4): 1238-44, 2003 Oct.
Article
en En
| MEDLINE
| ID: mdl-12801997
ABSTRACT
The present study was undertaken to identify the mechanisms underlying the effect of transforming growth factor (TGF) beta on FSH receptor (FSH-R) in rat granulosa cells. Compared to the control, the treatment of granulosa cells with TGFbeta (10 ng/ml) increased FSH-R mRNA transcripts (5.5 and 2.4 kilobases) in a time-dependent manner, with a maximum increase of approximately 2-fold at 48 h. We then investigated whether the effect of TGFbeta on FSH-R mRNA levels was the result of increased transcription and/or altered mRNA stability. To determine whether the FSH-R 5'-flanking region plays a role in directing FSH-R mRNA expression, the proximal area of the FSH-R 5'-flanking regions were inserted into an expression vector, pGL-Basic, which contains luciferase as the receptor gene, and the resulting plasmids were transiently transfected into rat granulosa cells. The FSH (30 ng/ml) significantly enhanced the activity of 1862 base pairs of the FSH-R 5'-flanking region, but treatment with TGFbeta did not significantly influence the activity induced by FSH. On the other hand, the decay curves for FSH-R mRNA transcript in primary granulosa cells showed a significant increase in half-life after the addition of TGFbeta. Transforming growth factor beta stimulates the expression of follistatin mRNA accumulation in a dose- and time-dependent manner. Treatment with activin produced a substantial increase in FSH-R mRNA level. Concurrent treatment with follistatin neutralized this activin effect on FSH-R mRNA, as reported, although concurrent treatment with follistatin did not affect TGFbeta-induced FSH-R mRNA. Therefore, the profile of the TGFbeta effect on FSH-R mRNA granulosa cells may be caused by the increased stability of FSH-R mRNA and insensitivity to the follistatin.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Receptores de HFE
/
ARN Mensajero
/
Factor de Crecimiento Transformador beta
/
Células de la Granulosa
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Biol Reprod
Año:
2003
Tipo del documento:
Article
País de afiliación:
Japón