c-Jun NH(2)-terminal kinase (JNK)1 and JNK2 signaling pathways have divergent roles in CD8(+) T cell-mediated antiviral immunity

The Journal of Experimental Medicine
Nathalie ArbourMichael B A Oldstone

Abstract

c-Jun NH(2)-terminal kinases (JNK) play important roles in T helper cell (Th) proliferation, differentiation, and maintenance of Th1/Th2 polarization. To determine whether JNKs are involved in antiviral T cell immunity, and whether JNK1 and JNK2 bear biological differences, we investigated the immune responses of JNK1-deficient and JNK2-deficient mice to lymphocytic choriomeningitis virus (LCMV). After LCMV infection, wild-type (JNK(+/+)) mice had a 5- to 10-fold increase in splenic CD8(+) T cells. In contrast, infected JNK1(-/-) mice showed a significantly lower virus-specific CD8(+) T cell expansion. However, JNK1(-/-) mice cleared LCMV infection with similar kinetics as JNK(+/+) mice. Splenic T cells from LCMV-infected JNK1(-/-) animals produced interferon gamma after stimulation with viral peptides. However, fewer JNK1(-/-) T cells acquired an activated phenotype (CD44(hi)) and more JNK1(-/-)CD8(+)CD44(hi) cells underwent apoptosis than JNK(+/+) cells at the peak of the primary response. In contrast, LCMV-infected JNK2(-/-) mice generated more virus-specific CD8(+) T cells than JNK(+/+) mice. These results indicate that JNK1 and JNK2 signal pathways have distinct roles in T cell responses during a viral infection. JNK1 is i...Continue Reading

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Methods Mentioned

BETA
Assay
Flow Cytometry
ELISA

Software Mentioned

GraphPad
Prism
FlowJo

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