Herpes simplex virus utilizes the large secretory vesicle pathway for anterograde transport of tegument and envelope proteins and for viral exocytosis from growth cones of human fetal axons

Monica Miranda-Saksena, Ross A. Boadle, Anupriya Aggarwal, Bibing Tijono, Frazer J Rixon, Russell J Diefenbach, Anthony L. Cunningham

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

Axonal transport of herpes simplex virus (HSV-1) is essential for viral infection and spread in the peripheral nervous system of the host. Therefore, the virus probably utilizes existing active transport and targeting mechanisms in neurons for virus assembly and spread from neurons to skin. In the present study, we used transmission immunoelectron microscopy to investigate the nature and origin of vesicles involved in the anterograde axonal transport of HSV-1 tegument and envelope proteins and of vesicles surrounding partially and fully enveloped capsids in growth cones. This study aimed to elucidate the mechanism of virus assembly and exit from axons of human fetal dorsal root ganglia neurons. We demonstrated that viral tegument and envelope proteins can travel in axons independently of viral capsids and were transported to the axon terminus in two types of transport vesicles, tubulovesicular membrane structures and large dense-cored vesicles. These vesicles and membrane carriers were derived from the trans-Golgi network (TGN) and contained key proteins, such as Rab3A, SNAP-25, GAP-43, and kinesin-1, involved in the secretory and exocytic pathways in axons. These proteins were also observed on fully and partially enveloped capsids in growth cones and on extracellular virions. Our findings provide further evidence to the subassembly model of separate transport in axons of unenveloped capsids from envelope and tegument proteins with final virus assembly occurring at the axon terminus. We postulate that HSV-1 capsids invaginate tegument- and envelope-bearing TGN-derived vesicles and utilize the large secretory vesicle pathway of exocytosis for exit from axons.

Original languageEnglish
Pages (from-to)3187-3199
Number of pages13
JournalJournal of Virology
Volume83
Issue number7
DOIs
Publication statusPublished - Apr 2009
Externally publishedYes

Keywords

  • Axons
  • Cell Line
  • Exocytosis
  • GAP-43 Protein
  • Growth Cones
  • Herpesvirus 1, Human
  • Humans
  • Kinesin
  • Microscopy, Immunoelectron
  • Secretory Vesicles
  • Synaptosomal-Associated Protein 25
  • Viral Structural Proteins
  • Virus Assembly
  • rab3A GTP-Binding Protein
  • Journal Article
  • Research Support, Non-U.S. Gov't

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