Requirement of mitogen-activated protein kinase kinase 3 (MKK3) for tumor necrosis factor-induced cytokine expression
Document Type
Journal ArticlePublication Date
1999-03-31Keywords
Amino Acid Sequence; Animals; Calcium-Calmodulin-Dependent Protein Kinases; Cells, Cultured; Cytokines; Fibroblasts; *Gene Expression Regulation; Interleukin-1; Interleukin-6; Intracellular Signaling Peptides and Proteins; JNK Mitogen-Activated Protein Kinases; Mice; Mice, Knockout; *Mitogen-Activated Protein Kinases; Molecular Sequence Data; Protein-Serine-Threonine Kinases; Restriction Mapping; Sorbitol; Tumor Necrosis Factor-alpha; Ultraviolet Rays; p38 Mitogen-Activated Protein KinasesLife Sciences
Medicine and Health Sciences
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The p38 mitogen-activated protein kinase is activated by treatment of cells with cytokines and by exposure to environmental stress. The effects of these stimuli on p38 MAP kinase are mediated by the MAP kinase kinases (MKKs) MKK3, MKK4, and MKK6. We have examined the function of the p38 MAP kinase signaling pathway by investigating the effect of targeted disruption of the Mkk3 gene. Here we report that Mkk3 gene disruption caused a selective defect in the response of fibroblasts to the proinflammatory cytokine tumor necrosis factor, including reduced p38 MAP kinase activation and cytokine expression. These data demonstrate that the MKK3 protein kinase is a critical component of a tumor necrosis factor-stimulated signaling pathway that causes increased expression of inflammatory cytokines.Source
Proc Natl Acad Sci U S A. 1999 Mar 30;96(7):3763-8.
DOI
10.1073/pnas.96.7.3763Permanent Link to this Item
http://hdl.handle.net/20.500.14038/34302PubMed ID
10097111Related Resources
ae974a485f413a2113503eed53cd6c53
10.1073/pnas.96.7.3763
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Role of the JIP4 scaffold protein in the regulation of mitogen-activated protein kinase signaling pathwaysKelkar, Nyaya; Standen, Claire L.; Davis, Roger J. (2005-03-16)The c-Jun NH2-terminal kinase (JNK)-interacting protein (JIP) group of scaffold proteins (JIP1, JIP2, and JIP3) can interact with components of the JNK signaling pathway and potently activate JNK. Here we describe the identification of a fourth member of the JIP family. The primary sequence of JIP4 is most closely related to that of JIP3. Like other members of the JIP family of scaffold proteins, JIP4 binds JNK and also the light chain of the microtubule motor protein kinesin-1. However, the function of JIP4 appears to be markedly different from other JIP proteins. Specifically, JIP4 does not activate JNK signaling. In contrast, JIP4 serves as an activator of the p38 mitogen-activated protein (MAP) kinase pathway by a mechanism that requires the MAP kinase kinases MKK3 and MKK6. The JIP4 scaffold protein therefore appears to be a new component of the p38 MAP kinase signaling pathway.
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Molecular determinants that mediate selective activation of p38 MAP kinase isoformsEnslen, Herve; Brancho, Deborah Marie; Davis, Roger J. (2000-03-16)The p38 mitogen-activated protein kinase (MAPK) group is represented by four isoforms in mammals (p38alpha, p38beta2, p38gamma and p38delta). These p38 MAPK isoforms appear to mediate distinct functions in vivo due, in part, to differences in substrate phosphorylation by individual p38 MAPKs and also to selective activation by MAPK kinases (MAPKKs). Here we report the identification of two factors that contribute to the specificity of p38 MAPK activation. One mechanism of specificity is the selective formation of functional complexes between MAPKK and different p38 MAPKs. The formation of these complexes requires the presence of a MAPK docking site in the N-terminus of the MAPKK. The second mechanism that confers signaling specificity is the selective recognition of the activation loop (T-loop) of p38 MAPK isoforms. Together, these processes provide a mechanism that enables the selective activation of p38 MAPK in response to activated MAPKK.