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The Immune Deficiency Pathway Regulates Metabolic Homeostasis in Drosophila.

J. Immunol.2019 May 01;202(9):2747-2759. Epub 2019 Mar 22
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摘要


Immune and metabolic pathways collectively influence host responses to microbial invaders, and mutations in one pathway frequently disrupt activity in another. We used the Drosophila melanogaster model to characterize metabolic homeostasis in flies with modified immune deficiency (IMD) pathway activity. The IMD pathway is very similar to the mammalian TNF-α pathway, a key regulator of vertebrate immunity and metabolism. We found that persistent activation of IMD resulted in hyperglycemia, depleted fat reserves, and developmental delays, implicating IMD in metabolic regulation. Consistent with this hypothesis, we found that imd mutants weigh more, are hyperlipidemic, and have impaired glucose tolerance. To test the importance of metabolic regulation for host responses to bacterial infection, we challenged insulin pathway mutants with lethal doses of several Drosophila pathogens. We found that loss-of-function mutations in the insulin pathway impacted host responses to infection in a manner that depends on the route of infection and the identity of the infectious microbe. Combined, our results support a role for coordinated regulation of immune and metabolic pathways in host containment of microbial invaders.

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