Tumor suppressor p53 inhibits autoimmune inflammation and macrophage function - PubMed (original) (raw)

Tumor suppressor p53 inhibits autoimmune inflammation and macrophage function

Shi-Jun Zheng et al. Diabetes. 2005 May.

Abstract

The tumor suppressor p53 regulates apoptosis, cell cycle, and oncogenesis. To explore the roles of p53 in autoimmunity, we studied type 1 diabetes and innate immune responses using C57BL/6 mice deficient in p53. We found that p53-deficient mice were more susceptible to streptozotocin-induced diabetes than control mice, and they produced higher levels of interleukin-1, -6, and -12. The innate immune response of p53-/- macrophages to lipopolysaccharides and gamma-interferon was significantly enhanced compared with p53+/+ cells. p53-/- macrophages produced more proinflammatory cytokines and higher levels of total and phosphorylated signal transducer and activator of transcription (STAT)-1. These results indicate that p53 inhibits autoimmune diabetes and innate immune responses through downregulating STAT-1 and proinflammatory cytokines.

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