title: Involvement of p38 mitogen-activated protein kinase in different stages of thymocyte development.
abstract: Positive selection of thymocytes during T-cell development is mediated by T-cell receptor (TCR)-activated signals. For different mitogen-activated protein kinases (MAPKs) activated by TCR complex, a selective involvement of extracellular signal-regulated kinase, but not p38 MAPK, in positive selection has been suggested. Using transgenic mice with dominant-negative mutation of both MAP kinase kinase 3 (MMK3) and MKK6, we obtained mice with different extents of inhibition of p38 MAPK activation. Partial inhibition of p38 MAPK impaired CD4(-)CD8(-) thymocyte development and T-cell proliferation, but not positive selection. Interference with thymocyte positive selection was observed in mice with effective suppression of p38 MAPK. Our results suggest that, in addition to early thymocyte development, p38 is involved in positive selection.
authors.affiliation: Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan, Republic of China.
authors.forename: Shu-Ching
authors.initials: SC
authors.lastname: Hsu
authors.forename: Chia-Cheng
authors.initials: CC
authors.lastname: Wu
authors.forename: Jiahuai
authors.initials: J
authors.lastname: Han
authors.forename: Ming-Zong
authors.initials: MZ
authors.lastname: Lai
mesh_terms: D000818:Animals; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000235:genetics / Q000494:pharmacology; D002454:Cell Differentiation; D002455:Cell Division; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D006801:Humans; D016130:Immunophenotyping; D018664:Interleukin-12 / Q000378:metabolism; D048371:MAP Kinase Kinase 3; D048669:MAP Kinase Kinase 6; D051379:Mice; D008822:Mice, Transgenic; D048308:Mitogen-Activated Protein Kinase 14; D020929:Mitogen-Activated Protein Kinase Kinases / Q000235:genetics / Q000494:pharmacology; D020928:Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000502:physiology*; D011505:Protein-Tyrosine Kinases / Q000235:genetics / Q000494:pharmacology; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology; D013950:Thymus Gland / Q000166:cytology* / Q000201:enzymology
chemical_list: D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D018664:Interleukin-12; D011505:Protein-Tyrosine Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D048308:Mitogen-Activated Protein Kinase 14; D020928:Mitogen-Activated Protein Kinases; D048371:MAP Kinase Kinase 3; D048669:MAP Kinase Kinase 6; C482530:MAP2K3 protein, human; C482566:MAP2K6 protein, human; C482531:Map2k3 protein, mouse; C482567:Map2k6 protein, mouse; D020929:Mitogen-Activated Protein Kinase Kinases