IL-9 is a multifunctional cytokine, belonging to a family of cytokines. IL-9 was initially reported as a T cell growth factor in mice. It is now known to target multiple cell types. It plays an important role in the expansion and recruitment of mast cells in response to intestinal nematode infection or during autoimmune encephalomyelitis. It is also known to act on various cell types known to be involved in asthma including T cells, B cells, mast cells, eosinophils, neutrophils, and epithelial cells. This pathway was inferred from Homo sapiens pathway [http://www.wikipathways.org/index.php?title=Pathway:WP22&oldid=20723 WP22(r20723)] with a 96% conversion rate.

interleukin-9 signaling pathway PW:0000909 Pathway Ontology