title: Interleukin-17 and its target genes: mechanisms of interleukin-17 function in disease.
abstract: Interleukin-17 (IL-17) has emerged as a central player in the mammalian immune system. Although this cytokine exerts a host-defensive role in many infectious diseases, it promotes inflammatory pathology in autoimmunity and other settings. A myriad of studies have focused on how IL-17-producing cells are generated. However, the means by which IL-17 achieves its effects, either for the benefit or the detriment of the host, are due in large part to the induction of new gene expression. Whereas many IL-17 target genes are common to different disease states, in some cases the effects of IL-17 differ depending on the target cell, infectious site or pathogen. Gene products induced by IL-17 include cytokines (IL-6, granulocyte-colony-stimulating factor, tumour necrosis factor-alpha), chemokines (CXCL1, CXCL2, CCL20, among many others), inflammatory effectors (acute-phase protesins, complement) and antimicrobial proteins (defensins, mucins). Different cell types appear to respond differently to IL-17 in terms of target gene expression, with notable differences seen in mesenchymal and epithelial cells compared with cells of haematopoietic origin. Here, we summarize the major IL-17 target genes that mediate this cytokine's activities in both autoimmune and chronic diseases as well as during various types of infections.
authors.affiliation: Department of Medicine, Division of Rheumatology & Clinical Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA.
authors.forename: Reiko M
authors.initials: RM
authors.lastname: Onishi
authors.forename: Sarah L
authors.initials: SL
authors.lastname: Gaffen
mesh_terms: D000818:Animals; D001327:Autoimmune Diseases / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D002908:Chronic Disease; D003141:Communicable Diseases / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D004194:Disease; D005786:Gene Expression Regulation; D006801:Humans; D020381:Interleukin-17 / Q000276:immunology / Q000502:physiology*
chemical_list: D020381:Interleukin-17
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