title: Identification and validation of candidate biomarkers involved in human ovarian autoimmunity.
abstract: Antibodies to multiple ovarian antigens have been proposed as markers of ovarian autoimmunity. The role of ovarian autoantibodies has been widely discussed in the pathophysiology of premature ovarian failure and unexplained infertility, but the autoantigens are yet to be identified. Three immunodominant ovarian autoantigens, α-actinin 4 (αACTN4), heat shock 70 protein 5 (HSPA5) and β-actin (ACTB), have been identified using anti-ovarian antibody-positive sera from women with idiopathic premature ovarian failure (n=50) and women undergoing IVF (n=695), using mass spectrometry. These autoantigens were subsequently validated using Western blot, immunohistochemistry and enzyme-linked immunosorbent assay. These autoantigens are localized to different components of the ovary such as the ooplasm of the oocyte, theca, granulosa, corpus luteum and zona pellucida. All the above antigens were found to be expressed in the ooplasm throughout follicular development. All the autoantigens are expressed specifically in the oocyte except αACTN4. The three autoantigens could contribute to the array of biomarkers to be used for developing specific and sensitive tests for diagnosis of women at risk of premature ovarian failure and IVF failure due to ovarian autoimmunity and could give an insight into the molecular mechanisms involved in the pathophysiology of these conditions.
authors: Department of Gamete Immunobiology, National Institute for Research in Reproductive Health (Indian Council of Medical Research), Jehangir Merwanji Street, Parel, Mumbai 400012, India.
authors: Purvi V
authors: PV
authors: Mande
authors: Firuza R
authors: FR
authors: Parikh
authors: Indira
authors: I
authors: Hinduja
authors: Kusum
authors: K
authors: Zaveri
authors: Rama
authors: R
authors: Vaidya
authors: Rahul
authors: R
authors: Gajbhiye
authors: Vrinda V
authors: VV
authors: Khole
mesh_terms: D000185:Actinin / Q000276:immunology*; D000199:Actins / Q000276:immunology*; D000328:Adult; D000818:Animals; D001323:Autoantibodies / Q000276:immunology; D001324:Autoantigens / Q000032:analysis; D015551:Autoimmunity / Q000276:immunology*; D015415:Biomarkers / Q000032:analysis*; D000091342:Endoplasmic Reticulum Chaperone BiP; D005260:Female; D006360:Heat-Shock Proteins / Q000276:immunology*; D006801:Humans; D007247:Infertility, Female / Q000276:immunology*; D010053:Ovary / Q000276:immunology*; D016649:Primary Ovarian Insufficiency / Q000175:diagnosis / Q000276:immunology; D051381:Rats
chemical_list: D000199:Actins; D001323:Autoantibodies; D001324:Autoantigens; D015415:Biomarkers; D000091342:Endoplasmic Reticulum Chaperone BiP; C000717247:HSPA5 protein, human; D006360:Heat-Shock Proteins; D000185:Actinin