title: Chronic macrophage migration inhibitory factor exposure induces mesenchymal epithelial transition and promotes gastric and colon cancers.
abstract: Macrophage Migration Inhibitory Factor (MIF) is an inflammatory cytokine that is highly produced in gastrointestinal cancers. Since chronic inflammation is a risk factor for tumorigenesis in these cancers, in this study, the role of MIF in pro-tumorigenic events was examined. MIF and its receptor, CD74, were examined in gastric and colon tumors and found to be increased in most tumors with significantly higher expression in tumors from patients with lymph node metastasis. MIF was also found to be highly produced by cancer associated fibroblasts isolated from human tumors compared to fibroblasts from matched normal tissues from uninvolved areas. Fibroblast-produced MIF highly increased GI cancer cell proliferation, which was decreased upon neutralizing MIF or CD74. Chronic MIF treatment led to sustained proliferation and signaling events in non-transformed GI fibroblast cells, which was maintained upon removing MIF treatment for 8 weeks. Additionally, chronic treatment of normal GI cells expressing fibroblast markers for up to 16 weeks with MIF led to a drastic decrease of fibroblast markers with concurrent increase of epithelial markers. Transformation was examined by telomerase and focus forming assays. These results suggest the MIF promotes mesenchymal epithelial transition, cell transformation and tumorigenesis in GI cancers, and thus may be an important link between chronic inflammation and tumorigenesis.
authors.affiliation: Department of Surgery, University of New Mexico, Albuquerque, New Mexico, United States of America.
authors.forename: Katherine T
authors.initials: KT
authors.lastname: Morris
authors.affiliation: Department of Molecular Genetics and Microbiology, University of New Mexico, Albuquerque, New Mexico, United States of America.
authors.forename: Robert A
authors.initials: RA
authors.lastname: Nofchissey
authors.affiliation: Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Texas Medical Branch, Galveston, Texas, United States of America.
authors.forename: Irina V
authors.initials: IV
authors.lastname: Pinchuk
authors.affiliation: Department of Molecular Genetics and Microbiology, University of New Mexico, Albuquerque, New Mexico, United States of America.
authors.forename: Ellen J
authors.initials: EJ
authors.lastname: Beswick
mesh_terms: D003110:Colonic Neoplasms / Q000209:etiology*; D058750:Epithelial-Mesenchymal Transition / Q000187:drug effects*; D006801:Humans; D008263:Macrophage Migration-Inhibitory Factors / Q000494:pharmacology*; D060888:Real-Time Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000209:etiology*
chemical_list: D008263:Macrophage Migration-Inhibitory Factors