Efficient Retrograde Transport of Pseudorabies Virus within Neurons Requires Local Protein Synthesis in Axons

SummaryAfter replicating in epithelial cells, alphaherpesviruses such as pseudorabies virus (PRV) invade axons of peripheral nervous system neurons and undergo retrograde transport toward the distant cell bodies. Although several viral proteins engage molecular motors to facilitate transport, the initial steps and neuronal responses to infection are poorly understood. Using compartmented neuron cultures to physically separate axon infection from cell bodies, we found that PRV infection induces local protein synthesis in axons, including proteins involved in cytoskeletal remodeling, intracellular trafficking, signaling, and metabolism. This rapid translation of axonal mRNAs is required for efficient PRV retrograde transport and infection of cell bodies. Furthermore, induction of axonal damage, which also induces local protein synthesis, prior to infection reduces virion trafficking, suggesting that host damage signals and virus particles compete for retrograde transport. Thus, similar to axonal damage, virus infection induces local protein translation in axons, and viruses likely exploit this response for invasion.

Graphical AbstractFigure optionsDownload high-quality image (196 K)Download as PowerPoint slideHighlights
► Pseudorabies virus (PRV) infection stimulates local protein synthesis in axons
► Infection induces the synthesis of LIS1, peripherin, and annexin A2 in axons
► Axonal inhibition of protein synthesis retards retrograde PRV capsid transport
► Prior damage in axons significantly reduces retrograde PRV capsid transport