کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2041819 | 1073174 | 2014 | 13 صفحه PDF | دانلود رایگان |

• Defective fly wing cell apoptosis in dark mutants induces a systemic immune response
• Metabolomics of dark mutants reveals a reduction in SAM levels due to Gnmt elevation
• Toll activation-induced Gnmt expression is mediated by dFoxO in the fat body
• Gnmt may be induced as a protective mechanism against wasting
SummarySterile inflammation triggered by endogenous factors is thought to contribute to the pathogenesis of acute and chronic inflammatory diseases. Here, we demonstrate that apoptosis-deficient mutants spontaneously develop a necrosis-driven systemic immune response in Drosophila and provide an in vivo model for studying the organismal response to sterile inflammation. Metabolomic analysis of hemolymph from apoptosis-deficient mutants revealed increased sarcosine and reduced S-adenosyl-methionine (SAM) levels due to glycine N-methyltransferase (Gnmt) upregulation. We showed that Gnmt was elevated in response to Toll activation induced by the local necrosis of wing epidermal cells. Necrosis-driven inflammatory conditions induced dFoxO hyperactivation, leading to an energy-wasting phenotype. Gnmt was cell-autonomously upregulated by dFoxO in the fat body as a possible rheostat for controlling energy loss, which functioned during fasting as well as inflammatory conditions. We propose that the dFoxO-Gnmt axis is essential for the maintenance of organismal SAM metabolism and energy homeostasis.
Graphical AbstractFigure optionsDownload as PowerPoint slide
Journal: - Volume 7, Issue 3, 8 May 2014, Pages 821–833