title: B-cell overexpression of Bcl-2 cooperates with p21 deficiency for the induction of autoimmunity and lymphomas.
abstract: Genetic abnormalities predisposing to autoimmunity generally act in a cooperative manner affecting one or several mechanisms regulating immunological tolerance. In addition, many of these genetic abnormalities are also involved in the development of lymphoproliferative diseases. In the present study, we have determined the possible cooperation between deficiencies in members of the Cip/Kip family of cell cycle regulators (p21(WAF1/Cip1) or p27(kip1)) and the overexpression of human Bcl-2 in B lymphocytes in the induction of autoimmune and lymphoproliferative diseases in non-autoimmune C57BL/6 (B6) mice. Unlike single mutant mice, B6.p21(-/-) mice transgenic for human Bcl-2 in B cells developed a lethal autoimmune syndrome characterized by the production of autoantibodies, the prominent expansion of memory B and CD4(+) T cells and the development of severe glomerular lesions resembling IgA nephropathy. Furthermore, these mice presented a high incidence of B-cell lymphoproliferative disorders. Such genetic cooperation in the induction of autoimmunity was not observed in B6.p27(-/-) mice transgenic for human Bcl-2 in B cells. Altogether, what we have demonstrated here is the existence of preferential interactions among particular regulators of the G(1)/S transition of the cell cycle and B-cell survival in the induction of systemic autoimmune and lymphoproliferative diseases.
authors.affiliation: Departmento de Biología Molecular, Universidad de Cantabria-Instituto de Formación e Investigación Marqués de Valdecilla, Santander, Spain.
authors.forename: Inés
authors.initials: I
authors.lastname: Santiuste
authors.forename: Luis
authors.initials: L
authors.lastname: Buelta
authors.forename: Marcos
authors.initials: M
authors.lastname: Iglesias
authors.forename: Fernanda
authors.initials: F
authors.lastname: Genre
authors.forename: Francisco
authors.initials: F
authors.lastname: Mazorra
authors.forename: Shozo
authors.initials: S
authors.lastname: Izui
authors.forename: Jesús
authors.initials: J
authors.lastname: Merino
authors.forename: Ramón
authors.initials: R
authors.lastname: Merino
mesh_terms: D000818:Animals; D001323:Autoantibodies / Q000097:blood / Q000276:immunology; D056735:Autoimmune Lymphoproliferative Syndrome / Q000150:complications / Q000235:genetics / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000172:deficiency; D050760:Cyclin-Dependent Kinase Inhibitor p27 / Q000172:deficiency; D004195:Disease Models, Animal; D004843:Epistasis, Genetic / Q000235:genetics / Q000276:immunology; D006801:Humans; D007156:Immunologic Memory; D007668:Kidney / Q000276:immunology / Q000473:pathology; D008180:Lupus Erythematosus, Systemic / Q000150:complications / Q000235:genetics / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D019076:Transgenes / Q000235:genetics
chemical_list: D001323:Autoantibodies; D050759:Cyclin-Dependent Kinase Inhibitor p21; D019253:Proto-Oncogene Proteins c-bcl-2; D050760:Cyclin-Dependent Kinase Inhibitor p27