title: Opposing regulation of B cell receptor-induced activation of mitogen-activated protein kinases by CD45.
abstract: In this study, we examined the contribution made by CD45 to B cell antigen receptor (BCR)-induced activation of mitogen-activated protein kinase (MAPK) family members. We found that CD45 negatively regulated BCR-induced c-Jun NH(2)-terminal kinase (JNK) and p38 activation in immature WEHI-231 cells, whereas in mature BAL-17 cells, CD45 positively regulated JNK and p38 activation and negatively regulated extracellular signal-regulated kinase activity. Furthermore, cooperative action of JNK and p38 dictated BCR-induced inhibition of growth. Thus, CD45 appears to differentially regulate BCR-induced activation of MAPK members, and can exert opposing effects on JNK and p38 in different cellular milieu, controlling the B cell fate.
authors.affiliation: Department of Immunology and Signal Transduction, Tokyo Metropolitan Institute for Neuroscience/Medical Research, 2-6 Musashidai, Fuchu, Tokyo 183-8526, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Ogimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Arimura
authors.forename: T
authors.initials: T
authors.lastname: Katagiri
authors.forename: K
authors.initials: K
authors.lastname: Mitomo
authors.forename: J R
authors.initials: JR
authors.lastname: Woodgett
authors.forename: A R
authors.initials: AR
authors.lastname: Nebreda
authors.forename: K
authors.initials: K
authors.lastname: Mizuno
authors.forename: H
authors.initials: H
authors.lastname: Yakura
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002460:Cell Line; D019070:Cell Lineage; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005419:Flavonoids / Q000494:pharmacology; D007093:Imidazoles / Q000494:pharmacology; D048031:JNK Mitogen-Activated Protein Kinases; D017493:Leukocyte Common Antigens / Q000502:physiology*; D020935:MAP Kinase Signaling System; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D011725:Pyridines / Q000494:pharmacology; D011947:Receptors, Antigen, B-Cell / Q000378:metabolism*; D013997:Time Factors; D014162:Transfection; D048051:p38 Mitogen-Activated Protein Kinases
chemical_list: D004791:Enzyme Inhibitors; D005419:Flavonoids; D007093:Imidazoles; D011725:Pyridines; D011947:Receptors, Antigen, B-Cell; D048031:JNK Mitogen-Activated Protein Kinases; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D017493:Leukocyte Common Antigens; C093642:SB 203580; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one