title: Expression of the retinoblastoma protein RbAp48 in exocrine glands leads to Sjögren's syndrome-like autoimmune exocrinopathy.
abstract: Although several autoimmune diseases are known to develop in postmenopausal women, the mechanisms by which estrogen deficiency influences autoimmunity remain unclear. Recently, we found that retinoblastoma-associated protein 48 (RbAp48) induces tissue-specific apoptosis in the exocrine glands depending on the level of estrogen deficiency. In this study, we report that transgenic (Tg) expression of RbAp48 resulted in the development of autoimmune exocrinopathy resembling Sjögren's syndrome. CD4(+) T cell-mediated autoimmune lesions were aggravated with age, in association with autoantibody productions. Surprisingly, we obtained evidence that salivary and lacrimal epithelial cells can produce interferon-gamma (IFN-gamma) in addition to interleukin-18, which activates IFN regulatory factor-1 and class II transactivator. Indeed, autoimmune lesions in Rag2(-/-) mice were induced by the adoptive transfer of lymph node T cells from RbAp48-Tg mice. These results indicate a novel immunocompetent role of epithelial cells that can produce IFN-gamma, resulting in loss of local tolerance before developing gender-based autoimmunity.
authors.affiliation: Department of Oral Molecular Pathology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan.
authors.forename: Naozumi
authors.initials: N
authors.lastname: Ishimaru
authors.forename: Rieko
authors.initials: R
authors.lastname: Arakaki
authors.forename: Satoko
authors.initials: S
authors.lastname: Yoshida
authors.forename: Akiko
authors.initials: A
authors.lastname: Yamada
authors.forename: Sumihare
authors.initials: S
authors.lastname: Noji
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Hayashi
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D001327:Autoimmune Diseases / Q000276:immunology / Q000473:pathology; D015415:Biomarkers / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D002478:Cells, Cultured; D016207:Cytokines / Q000276:immunology; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D004195:Disease Models, Animal; D004847:Epithelial Cells / Q000166:cytology / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D005088:Exocrine Glands / Q000166:cytology / Q000276:immunology* / Q000473:pathology*; D005260:Female; D005802:Genes, MHC Class II; D006801:Humans; D007371:Interferon-gamma / Q000276:immunology; D020382:Interleukin-18 / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D056505:Retinoblastoma-Binding Protein 4; D012859:Sjogren's Syndrome / Q000276:immunology / Q000473:pathology; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000637:transplantation; D013601:T-Lymphocytes / Q000276:immunology / Q000637:transplantation
chemical_list: D015415:Biomarkers; D002352:Carrier Proteins; D016207:Cytokines; D004268:DNA-Binding Proteins; D020382:Interleukin-18; D009687:Nuclear Proteins; C499308:Rag2 protein, mouse; C489969:Rbbp4 protein, mouse; D056505:Retinoblastoma-Binding Protein 4; D007371:Interferon-gamma