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Jaeschke, A. et al.

Disruption of the Jnk2 (Mapk9) gene reduces destructive insulitis and diabetes in a mouse model of type I diabetes.

The c-Jun NH(2)-terminal kinase isoform (JNK) 1 is implicated in type 2 diabetes. However, a potential role for the JNK2 protein kinase in diabetes has not been established. Here, we demonstrate that JNK2 may play an important role in type 1 (insulin-dependent) diabetes that is caused by autoimmune destruction of beta cells. Studies of nonobese diabetic mice demonstrated that disruption of the Mapk9 gene (which encodes the JNK2 protein kinase) decreased destructive insulitis and reduced disease progression to diabetes. CD4(+) T cells from JNK2-deficient nonobese diabetic mice produced less IFN-gamma but significantly increased amounts of IL-4 and IL-5, indicating polarization toward the Th2 phenotype. This role of JNK2 to control the Th1/Th2 balance of the immune response represents a mechanism of protection against autoimmune diabetes. We conclude that JNK protein kinases may have important roles in diabetes, including functions of JNK1 in type 2 diabetes and JNK2 in type 1 diabetes.[1]

References

Disruption of the Jnk2 (Mapk9) gene reduces destructive insulitis and diabetes in a mouse model of type I diabetes. Jaeschke, A., Rincón, M., Doran, B., Reilly, J., Neuberg, D., Greiner, D.L., Shultz, L.D., Rossini, A.A., Flavell, R.A., Davis, R.J. Proc. Natl. Acad. Sci. U.S.A. (2005) [Pubmed]

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