TNFα Regulates SIRT1 Cleavage during Ocular Autoimmune Disease

The American Journal of Pathology
Peter J GardnerVirginia L Calder

Abstract

Elevated tumor necrosis factor (TNF) α levels are associated with chronic autoimmune diseases in which effects of TNFα on immune cells are multiple and complex. Analysis of uveitis in mice exhibiting severe autoimmune inflammation, resulting in a destructive subtotal loss of photoreceptors, revealed the presence of high plasma levels of TNFα and a significant population of CD4(+)TNFα(+) cells in the periphery and the eye at peak disease (TNFα(hi)). We have shown previously by pharmacological activation that the deacetylase Sirtuin 1 (SIRT1) has an anti-inflammatory role in a less severe, TNFα(lo) model of uveitis. We now show that SIRT1 activation fails to clinically suppress severe TNFα(hi) disease, whereas glucocorticoid treatment is successful. TNFα has been reported to mediate cleavage and inactivation of SIRT1 during inflammation, and at peak disease we observed both full-length and cleaved SIRT1 in draining lymph node cells. In vivo systemic TNFα blockade suppressed severe ocular disease and restricted SIRT1 cleavage in the periphery, maintaining full-length active SIRT1 protein. When combining a suboptimal TNFα blockade with SIRT1 activation, a synergistic suppression of severe disease compared with TNFα blockade alone o...Continue Reading

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Nov 3, 2015·Biochemical and Biophysical Research Communications·Ying Zeng, Ke Yang
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