Regulation of innate and adaptive immune responses by MAP kinase phosphatase 5.
Mitogen-activated protein (MAP) kinases are essential regulators in immune responses, and their activities are modulated by kinases and phosphatases. MAP kinase phosphatase (MKP) is a family of dual-specificity phosphatases whose function is evolutionarily conserved. A number of mammalian MKPs have been identified so far, but their specific physiological functions in negative regulation of MAP kinases have not been genetically defined. Here we examine innate and adaptive immune responses in the absence of MKP5. JNK activity was selectively increased in Mkp5 (also known as Dusp10)-deficient mouse cells. Mkp5-deficient cells produced greatly enhanced levels of pro-inflammatory cytokines during innate immune responses and exhibited greater T-cell activation than their wild-type counterparts. However, Mkp5-deficient T cells proliferated poorly upon activation, which resulted in increased resistance to experimental autoimmune encephalomyelitis. By contrast, Mkp5-deficient CD4(+) and CD8(+) effector T cells produced significantly increased levels of cytokines compared with wild-type cells, which led to much more robust and rapidly fatal immune responses to secondary infection with lymphocytic choriomeningitis virus. Therefore, MKP5 has a principal function in both innate and adaptive immune responses, and represents a novel target for therapeutic intervention of immune diseases.
Department of Immunology, University of Washington, Seattle, Washington 98195-7650, USA.
Yongliang
Y
Zhang
Joseph N
JN
Blattman
Norman J
NJ
Kennedy
Julie
J
Duong
Thang
T
Nguyen
Ying
Y
Wang
Roger J
RJ
Davis
Philip D
PD
Greenberg
Richard A
RA
Flavell
Chen
C
Dong
D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D054637:Dual-Specificity Phosphatases; D004681:Encephalomyelitis, Autoimmune, Experimental; D017353:Gene Deletion; D006801:Humans; D007109:Immunity / Q000276:immunology*; D007113:Immunity, Innate / Q000276:immunology*; D015850:Interleukin-6 / Q000096:biosynthesis / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D048031:JNK Mitogen-Activated Protein Kinases; D019169:Jurkat Cells; D008070:Lipopolysaccharides / Q000494:pharmacology; D008213:Lymphocyte Activation / Q000187:drug effects; D008217:Lymphocytic choriomeningitis virus / Q000502:physiology; D017737:Macrophages, Peritoneal / Q000187:drug effects / Q000201:enzymology* / Q000276:immunology* / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D054639:Mitogen-Activated Protein Kinase Phosphatases; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D017027:Protein Tyrosine Phosphatases / Q000235:genetics / Q000378:metabolism*; D013601:T-Lymphocytes / Q000187:drug effects / Q000201:enzymology* / Q000276:immunology* / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis / Q000378:metabolism
D015850:Interleukin-6; D047908:Intracellular Signaling Peptides and Proteins; D008070:Lipopolysaccharides; D014409:Tumor Necrosis Factor-alpha; D048031:JNK Mitogen-Activated Protein Kinases; D020928:Mitogen-Activated Protein Kinases; C120407:DUSP10 protein, human; D054639:Mitogen-Activated Protein Kinase Phosphatases; D054637:Dual-Specificity Phosphatases; D017027:Protein Tyrosine Phosphatases