Liver receptor homolog-1 stimulates the progesterone biosynthetic pathway during follicle-stimulating hormone-induced granulosa cell differentiation.
FSH-stimulated granulosa cell differentiation is associated with the induction of the LH receptor (LHr) as well as induction of the estrogen and progesterone biosynthetic pathways. Although activation of the cAMP-protein kinase A pathway is sufficient to stimulate progesterone production, additional pathways are required for the induction of the LHr and p450 aromatase. The orphan nuclear receptor, liver receptor homolog-1 (LRH-1), is expressed in granulosa cells and has been shown to synergize with the cAMP signaling system to regulate the gonadal type II aromatase promoter in transient transfection assays. To determine whether LRH-1 can interact with the cAMP pathway in the induction of aromatase and the LHr, we examined the effects of an adenoviral vector that directs the expression of human LRH-1 (Ad-LRH-1) on FSH-stimulated granulosa cell differentiation. Infection of undifferentiated granulosa cells with LRH-1 alone had no effect on estrogen production, progesterone production, or the expression of the LHr. However, combination of FSH stimulation and Ad-LRH-1 infection led to significantly greater progesterone production and increases in mRNA for p450 side-chain cleavage and 3beta-hydroxysteroid dehydrogenase than granulosa cells stimulated by FSH alone. However, infection with Ad-LRH-1 did not stimulate estradiol production or increases in mRNA for p450 aromatase or the LHr above that seen with FSH treatment alone. Moreover, infection with Ad-LRH-1 was able to overcome H-89 inhibition of FSH-stimulated progesterone but not estrogen production. Collectively, these observations support a direct role for LRH-1 in the induction of the progesterone but not the estrogen biosynthetic pathway during granulosa cell differentiation.
Saxena
Deeksha
D
Department of Cell Biology and Physiology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA.
Safi
Rachid
R
Little-Ihrig
Lynda
L
Zeleznik
Anthony J
AJ
D015124:8-Bromo Cyclic Adenosine Monophosphate / Q000494:pharmacology; D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D002454:Cell Differentiation; D054746:Cyclic AMP-Dependent Protein Kinase Type II; D017868:Cyclic AMP-Dependent Protein Kinases / Q000502:physiology; D057137:DAX-1 Orphan Nuclear Receptor; D004268:DNA-Binding Proteins / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D004967:Estrogens / Q000096:biosynthesis; D005260:Female; D005640:Follicle Stimulating Hormone / Q000494:pharmacology*; D006107:Granulosa Cells / Q000166:cytology* / Q000378:metabolism; D006801:Humans; D011374:Progesterone / Q000096:biosynthesis*; D051381:Rats; D018160:Receptors, Cytoplasmic and Nuclear / Q000502:physiology*; D018168:Receptors, Retinoic Acid / Q000502:physiology; D012097:Repressor Proteins / Q000502:physiology
D057137:DAX-1 Orphan Nuclear Receptor; D004268:DNA-Binding Proteins; D004967:Estrogens; C539965:NR0B1 protein, human; C539966:Nr0b1 protein, mouse; C539967:Nr0b1 protein, rat; C431936:Nr5a2 protein, mouse; D018160:Receptors, Cytoplasmic and Nuclear; D018168:Receptors, Retinoic Acid; D012097:Repressor Proteins; D015124:8-Bromo Cyclic Adenosine Monophosphate; D011374:Progesterone; D005640:Follicle Stimulating Hormone; D054746:Cyclic AMP-Dependent Protein Kinase Type II; D017868:Cyclic AMP-Dependent Protein Kinases