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Controlling viral inflammatory lesions by inhibiting fatty acid metabolism.
Microbes and Infection 2023 April 20
Herpes simplex virus infection is a major cause of vision loss in humans. Eye damaging consequences are often driven by inflammatory cells as a result of an immune response to the virus. In the present report, we have compared the effect of inhibiting energy metabolism with etomoxir (Etox), which acts on the fatty acid oxidation pathway and 2-Deoxy-D-glucose (2DG), which acts on glycolysis for their inhibitory effects on herpetic ocular lesions. Both drugs showed similar protective effects when therapy was started on the day of infection, but some 2DG recipients succumbed to encephalitis. In contrast, all Etox recipients remained healthy. Both drugs were compared for effects on inflammatory reactions in the trigeminal ganglion (TG), where virus replicates and then establishes latency. Results indicate that 2DG significantly reduced CD8 and CD4 Th1 T cells in the TG, whereas Etox had minimal or no effect on such cells, perhaps explaining why encephalitis occurred only in 2DG recipients. Unlike treatment with 2DG, Etox therapy was largely ineffective when started at the time of lesion expression. Reasons for the differential effects were discussed as was the relevance of combining metabolic reprogramming approaches to combat viral inflammatory lesions.
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