INHA

Inhibin, alpha
Identifiers
Symbol	INHA
External IDs	OMIM: 147380 MGI: 96569 HomoloGene: 1652 GeneCards: INHA Gene
Gene ontology Molecular function • receptor binding • cytokine activity • transforming growth factor beta receptor binding • hormone activity • protein binding • growth factor activity • inhibin binding • protein heterodimerization activity Cellular component • photoreceptor outer segment • photoreceptor inner segment • extracellular region • extracellular space • cytoplasm • inhibin-betaglycan-ActRII complex • neuronal cell body • inhibin A complex • inhibin B complex Biological process • skeletal system development • ovarian follicle development • cell cycle arrest • signal transduction • cell surface receptor signaling pathway • cell-cell signaling • nervous system development • male gonad development • response to external stimulus • positive regulation of pathway-restricted SMAD protein phosphorylation • cell differentiation • erythrocyte differentiation • regulation of cell proliferation • negative regulation of phosphorylation • hemoglobin biosynthetic process • regulation of apoptotic process • regulation of MAPK cascade • negative regulation of interferon-gamma biosynthetic process • negative regulation of B cell differentiation • negative regulation of macrophage differentiation • negative regulation of cell cycle • positive regulation of follicle-stimulating hormone secretion • negative regulation of follicle-stimulating hormone secretion • cell development • regulation of cell cycle • SMAD protein signal transduction Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	3623	16322
Ensembl	ENSG00000123999	ENSMUSG00000032968
UniProt	P05111	Q04997
RefSeq (mRNA)	NM_002191	NM_010564
RefSeq (protein)	NP_002182	NP_034694
Location (UCSC)	Chr 2: 219.57 – 219.58 Mb	Chr 1: 75.51 – 75.51 Mb
PubMed search

Inhibin, alpha, also known as INHA, is a protein which in humans is encoded by the INHA gene.^[1]

Function

The inhibin alpha subunit joins either the beta A or beta B subunit to form a pituitary FSH secretion inhibitor. Inhibin has been shown to regulate gonadal stromal cell proliferation negatively and to have tumour-suppressor activity. In addition, serum levels of inhibin have been shown to reflect the size of granulosa-cell tumors and can therefore be used as a marker for primary as well as recurrent disease. However, in prostate cancer, expression of the inhibin alpha-subunit gene was suppressed and was not detectable in poorly differentiated tumor cells. Furthermore, because expression in gonadal and various extragonadal tissues may vary severalfold in a tissue-specific fashion, it is proposed that inhibin may be both a growth/differentiation factor and a hormone.^[2]

See also

• Inhibin

References

1. Burger HG, Igarashi M (April 1988). "Inhibin: definition and nomenclature, including related substances". Endocrinology 122 (4): 1701–2. doi:10.1210/endo-122-4-1701. PMID 3345731.
2. "Entrez Gene: INHA inhibin, alpha".

Further reading

• Mellor SL, Richards MG, Pedersen JS, et al. (1998). "Loss of the expression and localization of inhibin alpha-subunit in high grade prostate cancer". J. Clin. Endocrinol. Metab. 83 (3): 969–75. doi:10.1210/jc.83.3.969. PMID 9506758.
• Munz B, Hübner G, Tretter Y, et al. (1999). "A novel role of activin in inflammation and repair". J. Endocrinol. 161 (2): 187–93. doi:10.1677/joe.0.1610187. PMID 10320815.
• Welt C, Sidis Y, Keutmann H, Schneyer A (2002). "Activins, inhibins, and follistatins: from endocrinology to signaling. A paradigm for the new millennium". Exp. Biol. Med. (Maywood) 227 (9): 724–52. PMID 12324653.
• Shav-Tal Y, Zipori D (2003). "The role of activin a in regulation of hemopoiesis". Stem Cells 20 (6): 493–500. doi:10.1634/stemcells.20-6-493. PMID 12456957.
• Shao L, Frigon NL, Young AL, et al. (1992). "Effect of activin A on globin gene expression in purified human erythroid progenitors". Blood 79 (3): 773–81. PMID 1310063.
• Vannelli GB, Barni T, Forti G, et al. (1992). "Immunolocalization of inhibin alpha-subunit in the human testis. A light- and electron-microscopy study". Cell Tissue Res. 269 (2): 221–7. doi:10.1007/bf00319612. PMID 1423490.
• Matzuk MM, Finegold MJ, Su JG, et al. (1992). "Alpha-inhibin is a tumour-suppressor gene with gonadal specificity in mice". Nature 360 (6402): 313–9. doi:10.1038/360313a0. PMID 1448148.
• Shimonaka M, Inouye S, Shimasaki S, Ling N (1991). "Follistatin binds to both activin and inhibin through the common subunit". Endocrinology 128 (6): 3313–5. doi:10.1210/endo-128-6-3313. PMID 2036994.
• Mason AJ, Berkemeier LM, Schmelzer CH, Schwall RH (1990). "Activin B: precursor sequences, genomic structure and in vitro activities". Mol. Endocrinol. 3 (9): 1352–8. doi:10.1210/mend-3-9-1352. PMID 2575216.
• Barton DE, Yang-Feng TL, Mason AJ, et al. (1989). "Mapping of genes for inhibin subunits alpha, beta A, and beta B on human and mouse chromosomes and studies of jsd mice". Genomics 5 (1): 91–9. doi:10.1016/0888-7543(89)90091-8. PMID 2767687.
• Lappöhn RE, Burger HG, Bouma J, et al. (1989). "Inhibin as a marker for granulosa-cell tumors". N. Engl. J. Med. 321 (12): 790–3. doi:10.1056/NEJM198909213211204. PMID 2770810.
• Mayo KE, Cerelli GM, Spiess J, et al. (1986). "Inhibin A-subunit cDNAs from porcine ovary and human placenta". Proc. Natl. Acad. Sci. U.S.A. 83 (16): 5849–53. doi:10.1073/pnas.83.16.5849. PMC 386393. PMID 3016724.
• Ramasharma K, Li CH (1987). "Characteristics of binding of human seminal alpha-inhibin-92 to human pituitary membranes". Proc. Natl. Acad. Sci. U.S.A. 84 (11): 3595–8. doi:10.1073/pnas.84.11.3595. PMC 304921. PMID 3035540.
• Murata M, Eto Y, Shibai H, et al. (1988). "Erythroid differentiation factor is encoded by the same mRNA as that of the inhibin beta A chain". Proc. Natl. Acad. Sci. U.S.A. 85 (8): 2434–8. doi:10.1073/pnas.85.8.2434. PMC 280011. PMID 3267209.
• Burger HG, Igarashi M (1988). "Inhibin: definition and nomenclature, including related substances". Endocrinology 122 (4): 1701–2. doi:10.1210/endo-122-4-1701. PMID 3345731.
• Mason AJ, Niall HD, Seeburg PH (1986). "Structure of two human ovarian inhibins". Biochem. Biophys. Res. Commun. 135 (3): 957–64. doi:10.1016/0006-291X(86)91021-1. PMID 3754442.
• Stewart AG, Milborrow HM, Ring JM, et al. (1986). "Human inhibin genes. Genomic characterisation and sequencing". FEBS Lett. 206 (2): 329–34. doi:10.1016/0014-5793(86)81006-7. PMID 3758355.
• Xu J, McKeehan K, Matsuzaki K, McKeehan WL (1995). "Inhibin antagonizes inhibition of liver cell growth by activin by a dominant-negative mechanism". J. Biol. Chem. 270 (11): 6308–13. doi:10.1074/jbc.270.11.6308. PMID 7890768.
• Nishihara T, Okahashi N, Ueda N (1994). "Activin A induces apoptotic cell death". Biochem. Biophys. Res. Commun. 197 (2): 985–91. doi:10.1006/bbrc.1993.2576. PMID 8267637.
• Mason AJ, Farnworth PG, Sullivan J (1997). "Characterization and determination of the biological activities of noncleavable high molecular weight forms of inhibin A and activin A". Mol. Endocrinol. 10 (9): 1055–65. doi:10.1210/me.10.9.1055. PMID 8885240.