Egress of varicella-zoster virus from the melanoma cell: a tropism for the melanocyte.

Abstract:

:The pathway of envelopment and egress of the varicella-zoster virus (VZV) and the primary site of viral production within the epidermal layer of the skin are not fully understood. There are several hypotheses to explain how the virus may receive an envelope as it travels to the surface of the monolayer. In this study, we expand earlier reports and provide a more detailed explanation of the growth of VZV in human melanoma cells. Human melanoma cells were selected because they are a malignant derivative of the melanocyte, the melanin-producing cell which originates in the neural crest. We were able to observe the cytopathic effects of syncytial formation and the pattern of egress of virions at the surfaces of infected monolayers by scanning electron microscopy and laser-scanning confocal microscopy. The egressed virions did not appear uniformly over the syncytial surface, rather they were present in elongated patterns which were designated viral highways. In order to document the pathway by which VZV travels from the host cell nucleus to the outer cell membrane, melanoma cells were infected and then processed for examination by transmission electron microscopy (TEM) at increasing intervals postinfection. At the early time points, within minutes to hours postinfection, it was not possible to localize the input virus by TEM. Thus, viral particles first observed at 24 h postinfection were considered progeny virus. On the basis of the TEM observations, the following sequence of events was considered most likely. Nucleocapsids passed through the inner nuclear membrane and acquired an envelope, after which they were seen in the endoplasmic reticulum. Enveloped virions within vacuoles derived from the endoplasmic reticulum passed into the cytoplasm. Thereafter, vacuoles containing nascent enveloped particles acquired viral glycoproteins by fusion with vesicles derived from the Golgi. The vacuoles containing virions fused with the outer plasma membrane and the particles appeared on the surface of the infected cell. Late in infection, enveloped virions were also present within the nuclei of infected cells; the most likely mechanism was retrograde flow from the perinuclear space back into the nucleus. Thus, this study suggests a role for the melanocyte in the pathogenesis of VZV infection, because all steps in viral egress can be accounted for if VZV subsumes the cellular pathways required for melanogenesis.

journal_name

J Virol

journal_title

Journal of virology

authors

Harson R,Grose C

doi

10.1128/JVI.69.8.4994-5010.1995

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

4994-5010

issue

8

eissn

0022-538X

issn

1098-5514

journal_volume

69

pub_type

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