title: Ablation of IL-17A abrogates progression of spontaneous intestinal tumorigenesis.
abstract: The intrinsic role of endogenous IL-17A in spontaneous intestinal tumorigenesis has not been addressed previously to our knowledge. Ablation of IL-17A significantly reduced tumor development in mice bearing a heterozygote mutation in the adenomatous polyposis coli (APC) gene (Apc(Min/+) mice). There was also a decrease in inflammatory cytokines and proinflammatory mediators, reduced infiltration of lymphocytes including T cells, and preservation of intestinal architecture and the presence of APC protein in intestinal epithelial cells. Interestingly, IL-17A ablation also corrected immunological abnormalities such as splenomegaly and thymic atrophy in Apc(Min/+) mice. CD4 T cells from Apc(Min/+) mice showed hyperproliferative potential in vitro and in vivo and increased levels of IL-17A and IL-10. The effector CD4 T cells from Apc(Min/+) mice were more resistant to regulatory T cell-mediated suppression. Finally, these CD4 T cells induced colitis in immunodeficient mice upon adoptive transfer, whereas the ablation of IL-17A in CD4 T cells in Apc(Min/+) mice completely abolished this pathogenic potential in vivo. Taken together, our results show that CD4 T cell-derived IL-17A promotes spontaneous intestinal tumorigenesis with altered functions of CD4 T cells in Apc(Min/+) mice.
authors.affiliation: Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA.
authors.forename: Wook-Jin
authors.initials: WJ
authors.lastname: Chae
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Gibson
authors.forename: Daniel
authors.initials: D
authors.lastname: Zelterman
authors.forename: Liming
authors.initials: L
authors.lastname: Hao
authors.forename: Octavian
authors.initials: O
authors.lastname: Henegariu
authors.forename: Alfred L M
authors.initials: AL
authors.lastname: Bothwell
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000473:pathology; D016207:Cytokines / Q000235:genetics; D017491:Genes, APC; D018836:Inflammation Mediators / Q000378:metabolism; D020381:Interleukin-17 / Q000172:deficiency* / Q000235:genetics / Q000502:physiology; D007414:Intestinal Neoplasms / Q000209:etiology* / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D016246:Lymphocytes, Tumor-Infiltrating / Q000276:immunology / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008817:Mice, Mutant Strains; D010641:Phenotype; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012334:RNA, Neoplasm / Q000235:genetics / Q000378:metabolism; D013154:Spleen / Q000276:immunology / Q000473:pathology; D013950:Thymus Gland / Q000276:immunology / Q000473:pathology
chemical_list: D016207:Cytokines; D018836:Inflammation Mediators; D020381:Interleukin-17; D012333:RNA, Messenger; D012334:RNA, Neoplasm