Investigation of varicella-zoster virus neurotropism and neurovirulence using SCID mouse–human DRG xenografts
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Varicella-zoster virus (VZV) is a medically important human alphaherpesvirus. Investigating pathogenic mechanisms that contribute to VZV neurovirulence are made difficult by a marked host restriction. Our approach to investigating VZV neurotropism and neurovirulence has been to develop a mouse–human xenograft model in which human dorsal root ganglia (DRG) are maintained in severe compromised immunodeficient (SCID) mice. In this review, we will describe our key findings using this model in which we have demonstrated that VZV infection of SCID DRG xenograft results in rapid and efficient spread, enabled by satellite cell infection and polykaryon formation, which facilitates robust viral replication and release of infectious virus. In neurons that persist following this acute replicative phase, VZV genomes are present at low frequency with limited gene transcription and no protein synthesis, a state that resembles VZV latency in the natural human host. VZV glycoprotein I and interaction between glycoprotein I and glycoprotein E are critical for neurovirulence. Our work demonstrates that the DRG model can reveal characteristics about VZV replication and long-term persistence of latent VZV genomes in human neuronal tissues, in vivo, in an experimental system that may contribute to our knowledge of VZV neuropathogenesis.
KeywordsVaricella-zoster virus Neuropathogenesis Neurotropism Glycoprotein E Glycoprotein I SCID
We thank past and present members of the Arvin lab, many of whom contributed to these experiments, especially Mike Reichelt, Stefan Oliver, Xibing Che, Jaya Rajamani, Preeti Sikka, and Michelle Lai. We also thank Dr. Raymond A. Sobel, Professor of Pathology, Stanford University School of Medicine, for helpful discussions and collaborations. This work was supported by grants AI20459 and AI053846 from the National Institute of Allergy and Infectious Diseases and grant CA049605 from the National Cancer Institute.
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