title: Positive and negative regulation of IL-12 receptor expression of naive CD4(+) T cells by CD28/CD152 co-stimulation.
abstract: IL-12 is a critical cytokine for polarizing naive CD4(+) T cells toward Th1 subset. Therefore, it is important to elucidate the mechanism of IL-12R expression of naive CD4(+) T cells. In this report, we present evidence to show that expression of both IL-12Rbeta1 and beta2 mRNA is regulated by signals mediated through CD28 and CD152. Naive CD4(+) T cells stimulated with anti-CD3 alone neither expressed IL-12Rbeta2 mRNA nor bound detectable level of rIL-12, although they expressed a very low level of IL-12Rbeta1 mRNA when stimulated with a high dose of anti-CD3. Expression of IL-12Rbeta1 and beta2 mRNA was induced by the co-ligation of CD3 and CD28, and it was down-regulated by the ligation of CD152. CD28 ligation induced not only IL-12Rbeta1 and beta2 mRNA expression, but also enhanced IFN-gammaR to mediate up-regulation of IL-12R by IFN-gamma.
authors.affiliation: Department of Allergology, Institute of Medical Science, University of Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yamane
authors.forename: O
authors.initials: O
authors.lastname: Igarashi
authors.forename: T
authors.initials: T
authors.lastname: Kato
authors.forename: H
authors.initials: H
authors.lastname: Nariuchi
mesh_terms: D000069594:Abatacept; D000818:Animals; D015703:Antigens, CD; D000943:Antigens, Differentiation / Q000276:immunology*; D018106:CD28 Antigens / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D016466:CHO Cells; D060908:CTLA-4 Antigen; D006224:Cricetinae; D005786:Gene Expression Regulation / Q000276:immunology; D018796:Immunoconjugates; D008024:Ligands; D051379:Mice; D008810:Mice, Inbred C57BL; D018123:Receptors, Interleukin / Q000096:biosynthesis / Q000276:immunology*; D053707:Receptors, Interleukin-12; D015398:Signal Transduction / Q000276:immunology
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D018106:CD28 Antigens; D060908:CTLA-4 Antigen; C556707:Ctla4 protein, mouse; C508443:Il12rb2 protein, mouse; D018796:Immunoconjugates; D008024:Ligands; D018123:Receptors, Interleukin; D053707:Receptors, Interleukin-12; D000069594:Abatacept