title: Antigen-induced inhibition of autoimmune response to rat male accessory glands: distinct characteristics of I-A- and I-E-positive peritoneal cells.
abstract: The present report describes different aspects of two populations of peritoneal cells (PC) obtained from rats injected i.p. 2 h or 24 h previously with a suppressor dose of a purified fraction (FI) of rat male accessory glands (RAG) (FI-PC2h and FI-PC24h, respectively). The FI-PC2h, which are mainly I-E (OX17) positive and can suppress the autoimmune response to RAG autoantigens, have an elevated phagocytic activity against Candida albicans and capacity to reduce the dye nitroblue tetrazolium. In contrast, FI-PC24h, which are mainly I-A (OX6) positive and can potentiate the autoimmunity to RAG autoantigens, have a diminished capacity to reduce the dye and a diminished phagocytic activity. Moreover, the Toxoplasma gondii appear to have a different effect on both populations. The parasites can invade FI-PC2h while FI-PC24h offer resistance to T. gondii aggression. FI-PC2h cultured during 22 h (FI-PC2-24h in vitro), or PC obtained from syngeneic recipients injected i.p. 22 h previously with FI-PC2h (FI-PC2-24h in vivo) show, as FI-PC2h, an increase of the I-E+ cells and capacity to induce suppression of the delayed-type hypersensitivity response to RAG autoantigens when they are injected to syngeneic rats 10 and 3 days prior to the immunization with chemically modified (diazotized arsanilic and sulfanilic acid) RAG in complete Freund's adjuvant. The PC obtained 24 h after injection of irradiated rats with N-PC plus FI show an increase of I-E+ cells whereas an enhancement of I-A+ cells can be observed when the PC are obtained 24 h after injection of irradiated and bone marrow-reconstituted rats with N-PC plus FI. These findings appear to indicate that FI-PC2h and FI-PC24h are functionally different and that the population obtained 24 h after injection of FI of RAG could not originate from either the population present 2 h after injection of FI of RAG injection nor from normal PC. They appear to require bone marrow precursors.
authors.affiliation: Inmunologia, Facultad de Ciencias Quimicas, Universidad Nacional de Córdoba, Argentina.
authors.forename: V E
authors.initials: VE
authors.lastname: Rivero
authors.forename: M E
authors.initials: ME
authors.lastname: Ferro
authors.forename: M
authors.initials: M
authors.lastname: Romero-Piffiguer
authors.forename: S
authors.initials: S
authors.lastname: Correa
authors.forename: N
authors.initials: N
authors.lastname: Yranzo-Volonté
authors.forename: C M
authors.initials: CM
authors.lastname: Riera
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000502:physiology; D000954:Antigens, Surface / Q000032:analysis* / Q000276:immunology; D001323:Autoantibodies / Q000096:biosynthesis*; D001324:Autoantigens / Q000276:immunology; D005837:Genitalia, Male / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D008297:Male; D010529:Peritoneal Cavity / Q000166:cytology; D010587:Phagocytosis; D051381:Rats; D011919:Rats, Inbred Strains; D006377:T-Lymphocytes, Helper-Inducer / Q000502:physiology*; D050378:T-Lymphocytes, Regulatory / Q000502:physiology*
chemical_list: D000954:Antigens, Surface; D001323:Autoantibodies; D001324:Autoantigens; D000949:Histocompatibility Antigens Class II