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Semliki Forest virus and Sindbis virus, but not vaccinia virus, require glycolysis for optimal replication.

Viruses are obligate intracellular pathogens which rely on the cell's machinery to produce the energy and macromolecules required for replication. Infection is associated with a modified metabolic profile and one pathway which can be modified is glycolysis. In this study, we investigated if the glycolysis pathway is required for alphavirus replication. Pre-treatment of Vero cells with three different glycolysis inhibitors (2-deoxyglucose, lonidamine and oxamate) resulted in a significant reduction (but not abrogation) of Semliki Forest virus and Sindbis virus replication, but not of the unrelated virus, vaccinia virus. Reduced virus yield was not associated with any significant cytotoxic effect and delayed treatment up to 3 h post-infection still resulted in a significant reduction. This suggested that glycolysis is required for optimal replication of alphaviruses by supporting post-entry life cycle steps.