title: The secreted form of the p40 subunit of interleukin (IL)-12 inhibits IL-23 functions and abrogates IL-23-mediated antitumour effects.
abstract: Interleukin (IL)-23 is a heterodimeric cytokine consisting of a novel p19 molecule and the p40 subunit of IL-12. Since secreted p40 can act as an antagonist for IL-12, we investigated whether p40 also inhibited IL-23-mediated immunological functions. p40 did not induce interferon (IFN)-gamma or IL-17 production from splenocytes but impaired IL-23-induced cytokine production by competitive binding to the IL-23 receptors. Furthermore, a mixed population of murine colon carcinoma Colon 26 cells transduced with the p40 gene and those transduced with the IL-23 gene developed tumours in syngenic mice, whereas the IL-23-expressing Colon 26 cells were completely rejected. p40 also suppressed IFN-gamma production of antigen-stimulated splenocytes and IL-23-mediated cytotoxic T-lymphocyte activities in the mice that rejected Colon 26 cells expressing IL-23. p40 can thereby antagonize IL-23 and is a possible therapeutic agent for suppression of IL-23 functions.
authors.affiliation: Division of Pathology, Chiba Cancer Center Research Institute, Nitona, Chiba, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Shimozato
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Ugai
authors.forename: Masako
authors.initials: M
authors.lastname: Chiyo
authors.forename: Hisanori
authors.initials: H
authors.lastname: Takenobu
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Nagakawa
authors.forename: Akihiko
authors.initials: A
authors.lastname: Wada
authors.forename: Kiyoko
authors.initials: K
authors.lastname: Kawamura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamamoto
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Tagawa
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D003110:Colonic Neoplasms / Q000276:immunology* / Q000517:prevention & control; D016207:Cytokines / Q000096:biosynthesis; D003602:Cytotoxicity, Immunologic / Q000276:immunology; D005260:Female; D007371:Interferon-gamma / Q000096:biosynthesis; D018664:Interleukin-12 / Q000235:genetics / Q000276:immunology*; D053762:Interleukin-12 Subunit p40; D053759:Interleukin-23; D053760:Interleukin-23 Subunit p19; D007378:Interleukins / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D009368:Neoplasm Transplantation; D021122:Protein Subunits / Q000235:genetics / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014161:Transduction, Genetic; D014407:Tumor Cells, Cultured
chemical_list: D016207:Cytokines; C508841:Il23a protein, mouse; D053762:Interleukin-12 Subunit p40; D053759:Interleukin-23; D053760:Interleukin-23 Subunit p19; D007378:Interleukins; D021122:Protein Subunits; D018664:Interleukin-12; D007371:Interferon-gamma