Mechanisms of FSH synthesis: what we know, what we don't, and why you should care.
The pituitary gonadotropin hormones, FSH and LH, are key regulators of reproductive physiology. Though the two hormones are produced by the same cell type, often in response to the same endocrine and paracrine regulators, they sub-serve different biological functions and their synthesis and secretion are differentially regulated. This stems largely from differences in transcriptional, post-transcriptional, and post-translational regulation of their unique beta subunits. That is, both hormones are dimeric glycoproteins and share a common alpha subunit. Their unique beta subunits, however, derive from different genes encoding distinct proteins. Past and recent research indicates synthesis and release of the two hormones are subject to extensive and independent regulation. LH appears to be secreted predominantly via the regulated secretory pathway, whereas FSH release is largely constitutive. As such, investigations of FSH-beta subunit synthesis may lend direct insight into mechanisms underlying patterns of secreted FSH, more so than investigations of the LHbeta subunit. Here, we review recent investigations of transcriptional regulation of the FSH-beta subunit gene from different mammalian species, including humans. The results reveal both conserved and species-specific regulatory mechanisms that might contribute to inter-species variation in FSH release.
Bernard
Daniel J
DJ
Department of Pharmacology and Therapeutics, McGill University, Montréal, Quebec, Canada. daniel.bernard@mcgill.ca
Fortin
Jérôme
J
Wang
Ying
Y
Lamba
Pankaj
P
D028341:Activins / Q000502:physiology; D000728:Androgens / Q000502:physiology; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D004967:Estrogens / Q000502:physiology; D005260:Female; D037201:Follicle Stimulating Hormone, beta Subunit / Q000096:biosynthesis* / Q000378:metabolism; D038681:Follistatin / Q000502:physiology; D050989:GATA2 Transcription Factor / Q000502:physiology; D005786:Gene Expression Regulation; D015292:Glycoprotein Hormones, alpha Subunit; D052681:Gonadotrophs / Q000378:metabolism; D007987:Gonadotropin-Releasing Hormone / Q000502:physiology; D018398:Homeodomain Proteins / Q000235:genetics / Q000502:physiology; D006801:Humans; D007265:Inhibins / Q000502:physiology; D060850:LIM-Homeodomain Proteins; D008297:Male; D008969:Molecular Sequence Data; D051761:Paired Box Transcription Factors / Q000502:physiology; D011401:Promoter Regions, Genetic / Q000502:physiology; D016415:Sequence Alignment; D013045:Species Specificity; D054339:Steroidogenic Factor 1 / Q000502:physiology; D014157:Transcription Factors
D000728:Androgens; D004967:Estrogens; D037201:Follicle Stimulating Hormone, beta Subunit; D038681:Follistatin; D050989:GATA2 Transcription Factor; D015292:Glycoprotein Hormones, alpha Subunit; D018398:Homeodomain Proteins; D060850:LIM-Homeodomain Proteins; C094898:Lhx3 protein; D051761:Paired Box Transcription Factors; D054339:Steroidogenic Factor 1; D014157:Transcription Factors; D028341:Activins; D007987:Gonadotropin-Releasing Hormone; D007265:Inhibins