title: Interleukin-6 signals activating junB and TIS11 gene transcription in a B-cell hybridoma.
abstract: The events in interleukin-6 (IL-6) signal transduction leading to primary response gene activation were analyzed in murine B-cell hybridoma and plasmacytoma cells which require IL-6 for growth. IL-6 stimulation of IL-6-deprived cells resulted in the rapid and transient tyrosine phosphorylation of a 160-kDa cellular protein (p160). This was followed by the highly selective induction of two primary response genes, junB/AP-1 transcription factor and TIS11. junB and TIS11 inductions were unaffected by cycloheximide, suggesting that posttranslational modifications accounted for their activation. Activation of junB and TIS11 transcription required rapid tyrosine kinase activity as well as a different protein kinase activity sensitive to the potent kinase inhibitor, H7, and activated following p160 tyrosine phosphorylation. This H7-sensitive kinase appears to be distinct from any well-characterized protein kinase-second messenger system. On the basis of these findings, we propose that IL-6-induced signal transduction proceeds through a novel protein kinase cascade which activates junB and TIS11 gene transcription.
authors.affiliation: Department of Microbiology and Immunology, School of Medicine, University of California, Los Angeles 90024.
authors.forename: K
authors.initials: K
authors.lastname: Nakajima
authors.forename: R
authors.initials: R
authors.lastname: Wall
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000818:Animals; D001402:B-Lymphocytes / Q000502:physiology*; D003513:Cycloheximide / Q000494:pharmacology; D004268:DNA-Binding Proteins / Q000235:genetics*; D005786:Gene Expression Regulation; D019833:Genistein; D006825:Hybridomas; D017874:Immediate-Early Proteins; D066298:In Vitro Techniques; D015850:Interleukin-6 / Q000502:physiology*; D007529:Isoflavones / Q000494:pharmacology; D007546:Isoquinolines / Q000494:pharmacology; D008213:Lymphocyte Activation; D051379:Mice; D008970:Molecular Weight; D010750:Phosphoproteins / Q000378:metabolism; D010766:Phosphorylation; D019000:Phosphotyrosine; D010879:Piperazines / Q000494:pharmacology; D047428:Protein Kinase Inhibitors; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D011506:Proteins / Q000235:genetics*; D016755:Proto-Oncogene Proteins c-jun; D015398:Signal Transduction; D014158:Transcription, Genetic; D015533:Transcriptional Activation; D051816:Tristetraprolin; D014443:Tyrosine / Q000031:analogs & derivatives / Q000378:metabolism
chemical_list: D004268:DNA-Binding Proteins; D017874:Immediate-Early Proteins; D015850:Interleukin-6; D007529:Isoflavones; D007546:Isoquinolines; D010750:Phosphoproteins; D010879:Piperazines; D047428:Protein Kinase Inhibitors; D011506:Proteins; D016755:Proto-Oncogene Proteins c-jun; D051816:Tristetraprolin; C497553:Zfp36 protein, mouse; D019000:Phosphotyrosine; D014443:Tyrosine; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D003513:Cycloheximide; D019833:Genistein; D011505:Protein-Tyrosine Kinases