title: IL-8 promotes cell proliferation and migration through metalloproteinase-cleavage proHB-EGF in human colon carcinoma cells.
abstract: Interleukin-8 (IL-8) has been reported to promote tumor cell growth in colon cancer cells after binding to its receptors, which are members of the G-protein coupled receptor (GPCR) family. Recent studies demonstrated that stimulation of GPCR can induce shedding of epidermal growth factor (EGF) ligands via activation of a disintegrin and metalloprotease (ADAM), with subsequent transactivation of the EGF receptor (EGFR). In this study, we investigated mechanisms of cell proliferation and migration stimulated by IL-8 in a human colon carcinoma cell line (Caco2). IL-8 increased DNA synthesis of Caco2 in a dose dependent manner and this was inhibited by ADAM, EGFR kinase, and MEK inhibitors. IL-8 transiently induced EGFR tyrosine phosphorylation after 5-90 min and this was completely inhibited by ADAM inhibitor. Neutralizing antibody against HB-EGF as a key ligand for EGFR also blocked transactivation of EGFR and cell proliferation by IL-8. Since IL-8-induced cell migration was further suppressed by the ADAM inhibitor and the HB-EGF neutralizing antibody, our data indicate that IL-8 induces cell proliferation and migration by an ADAM-dependent pathway, and that HB-EGF plays an important role as the major ligand for this pathway.
authors.affiliation: Department of Internal Medicine and Bioregulation, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho, Nagoya 467-8601, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Itoh
authors.forename: Takashi
authors.initials: T
authors.lastname: Joh
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tanida
authors.forename: Makoto
authors.initials: M
authors.lastname: Sasaki
authors.forename: Hiromi
authors.initials: H
authors.lastname: Kataoka
authors.forename: Keisuke
authors.initials: K
authors.lastname: Itoh
authors.forename: Tadayuki
authors.initials: T
authors.lastname: Oshima
authors.forename: Naotaka
authors.initials: N
authors.lastname: Ogasawara
authors.forename: Shouzo
authors.initials: S
authors.lastname: Togawa
authors.forename: Tsuneya
authors.initials: T
authors.lastname: Wada
authors.forename: Hidetsugu
authors.initials: H
authors.lastname: Kubota
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Mori
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Ohara
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Nomura
authors.forename: Shigeki
authors.initials: S
authors.lastname: Higashiyama
authors.forename: Makoto
authors.initials: M
authors.lastname: Itoh
mesh_terms: D018938:Caco-2 Cells; D002277:Carcinoma / Q000201:enzymology* / Q000276:immunology / Q000473:pathology; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D003110:Colonic Neoplasms / Q000201:enzymology* / Q000276:immunology / Q000473:pathology; D004815:Epidermal Growth Factor / Q000502:physiology*; D066246:ErbB Receptors / Q000378:metabolism; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D066257:Heparin-binding EGF-like Growth Factor; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D016209:Interleukin-8 / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D008666:Metalloendopeptidases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D020929:Mitogen-Activated Protein Kinase Kinases / Q000037:antagonists & inhibitors; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D011956:Receptors, Cell Surface / Q000378:metabolism*; D015398:Signal Transduction
chemical_list: C587883:HBEGF protein, human; D066257:Heparin-binding EGF-like Growth Factor; D036341:Intercellular Signaling Peptides and Proteins; D016209:Interleukin-8; D047428:Protein Kinase Inhibitors; D011956:Receptors, Cell Surface; D004815:Epidermal Growth Factor; D066246:ErbB Receptors; D048049:Extracellular Signal-Regulated MAP Kinases; D020929:Mitogen-Activated Protein Kinase Kinases; D008666:Metalloendopeptidases