title: Redistribution of ERK/MAP kinase to uropod-like structures in interleukin-3-induced cell shape changes.
abstract: Interleukin-3 (IL-3) is one of the cytokines of significance for the regulation of hematopoiesis and inflammation. Recently, we established IL-3-dependent Ba/F3 pro-B cells ectopically expressing RON tyrosine kinase, a receptor for macrophage-stimulating protein (MSP), and showed that MSP stimulation specifically promoted cell morphological changes through tyrosine phosphorylation of the IL-3 common beta-chain receptor subunit (betac) by activated RON kinase without activation of JAK2 tyrosine kinase. Here we investigate the IL-3 signaling pathway leading to morphological changes through tyrosine phosphorylation of betac. Treatment of RON-expressing cells with PD98059 or U0126, inhibitors of mitogen-activated protein kinase kinase activity, blocked both IL-3- and MSP-induced morphological changes. Upon stimulation with IL-3 or MSP, extracellular-regulated kinase (ERK) and F-actin were redistributed in uropod-like structures. ERK and F-actin were colocalized within uropod-like structures, and a majority of F-actin were localized around the peripheries of accumulated ERK. Tyrosine phosphorylation of ERK was detected after stimulation with IL-3 or MSP, whereas treatment with U0126 specifically inhibited IL-3- or MSP-induced ERK phosphorylation but not tyrosine phosphorylation of betac. These results suggest that the activation and localization of ERK to uropod-like structures play a role in IL-3-induced morphological changes.
authors.affiliation: Department of Cell Differentiation, Institute of Molecular Embryology and Genetics, Kumamoto University School of Medicine, Kumamoto 860-0811, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Mera
authors.forename: Moritaka
authors.initials: M
authors.lastname: Suga
authors.forename: Yuji
authors.initials: Y
authors.lastname: Nakayama
authors.forename: Masayuki
authors.initials: M
authors.lastname: Ando
authors.forename: Toshio
authors.initials: T
authors.lastname: Suda
authors.forename: Naoto
authors.initials: N
authors.lastname: Yamaguchi
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology* / Q000187:drug effects* / Q000276:immunology / Q000378:metabolism; D002070:Butadienes / Q000494:pharmacology; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005419:Flavonoids / Q000494:pharmacology; D005455:Fluorescent Antibody Technique; D017228:Hepatocyte Growth Factor / Q000494:pharmacology; D006801:Humans; D007377:Interleukin-3 / Q000494:pharmacology; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000187:drug effects / Q000378:metabolism*; D009570:Nitriles / Q000494:pharmacology; D010766:Phosphorylation; D019000:Phosphotyrosine; D011518:Proto-Oncogene Proteins / Q000494:pharmacology; D020794:Receptor Protein-Tyrosine Kinases / Q000378:metabolism; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000378:metabolism; D015398:Signal Transduction / Q000276:immunology*
chemical_list: D002070:Butadienes; D004791:Enzyme Inhibitors; D005419:Flavonoids; D007377:Interleukin-3; D009570:Nitriles; D011518:Proto-Oncogene Proteins; D016693:Receptors, Antigen, T-Cell, alpha-beta; D011956:Receptors, Cell Surface; C113580:U 0126; C082332:macrophage stimulating protein; D019000:Phosphotyrosine; D017228:Hepatocyte Growth Factor; C080835:RON protein; D020794:Receptor Protein-Tyrosine Kinases; D020928:Mitogen-Activated Protein Kinases; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one