title: Requirement for tyrosine phosphorylation in lipopolysaccharide-induced murine B-cell proliferation.
abstract: Bacterial lipopolysaccharide (LPS) induces a strong B-cell proliferative response with subsequent differentiation, through a complex signal transduction pathway. This process is known to be mediated through protein kinase C (PKC) translocation without Ca2+ mobilization. Here, we show that B-cell proliferative responses induced by five different LPS preparations, as well as by F(ab')2 anti-IgM antibodies, are inhibited by the tyrosine kinase inhibitors, genistein and herbimycin A. In contrast, B-cell proliferation induced by the combination of phorbol 12-myristate 13-acetate (PMA) plus ionomycin was not influenced by treatment with either herbimycin A or genistein. These data indicate that tyrosine phosphorylation is required to initiate B-cell proliferation by LPS.
authors.affiliation: Laboratory of Immunology, INSERM U80, Hôpital E. Herriot, Lyons, France.
authors.forename: M T
authors.initials: MT
authors.lastname: Dearden-Badet
authors.forename: J P
authors.initials: JP
authors.lastname: Revillard
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D016227:Benzoquinones; D002455:Cell Division / Q000187:drug effects / Q000276:immunology; D002478:Cells, Cultured; D019833:Genistein; D007529:Isoflavones / Q000494:pharmacology; D047029:Lactams, Macrocyclic; D008070:Lipopolysaccharides / Q000276:immunology*; D008213:Lymphocyte Activation / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D011809:Quinones / Q000494:pharmacology; D017828:Rifabutin / Q000031:analogs & derivatives; D014443:Tyrosine / Q000378:metabolism*
chemical_list: D016227:Benzoquinones; D007529:Isoflavones; D047029:Lactams, Macrocyclic; D008070:Lipopolysaccharides; D011809:Quinones; D017828:Rifabutin; D014443:Tyrosine; C020754:herbimycin; D019833:Genistein; D011505:Protein-Tyrosine Kinases