Infection by human herpesvirus 6 (HHV-6) of human lymphoid T cells occurs through an endocytic pathway

M. Cirone, C. Zompetta, A. Angeloni, D. V. Ablashi, S. Z. Salahuddin, A. Pavan, M. R. Torrisi, L. Frati, A. Faggioni

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We have analyzed by immunoelectron microscopy the early events of binding and internalization of human herpesvirus 6 (HHV-6, strain GS) on a susceptible T-lymphoblastoid cell line, HSB-2. The virions bound to the cell surface at 4°C were tightly associated with the plasma membrane. Gold immunolabeling of the viral envelope proteins was strong and specific. Warming at 37°C for different times showed viral internalization through smooth surfaced pits and vesicles. Fusion events of the virions with the cell plasma membrane were never observed. Gold immunolabeling performed in parallel experiments before or after viral internalization showed: (1) absence of viral envelope proteins on the cell plasma membranes at all times of internalization, again excluding fusion events; (2) entry of the virions with their envelopes. Treatment of the cells with chloroquine, a drug known to affect the endocytic pathway, led to an almost complete inhibition of viral infectivity, suggesting that the endocytosed virions are responsible for a successful infection. Comparable results were obtained using a second strain of HHV-6 (BA92), with biologic and molecular characteristics similar to the prototype strain Z29. The chloroquine inhibition was effective on two different T cell lines (HSB-2 and J-Jhan), as well as on phytohemagglutinin-stimulated peripheral blood mononuclear cells.

Original languageEnglish
Pages (from-to)2031-2037
Number of pages7
JournalAIDS Research and Human Retroviruses
Volume8
Issue number12
Publication statusPublished - 1992

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Human Herpesvirus 6
Virion
Cell Membrane
Lymphocytes
T-Lymphocytes
Viral Envelope Proteins
Infection
Chloroquine
Gold
Cell Line
Immunoelectron Microscopy
Phytohemagglutinins
Endocytosis
Blood Cells
Pharmaceutical Preparations

ASJC Scopus subject areas

  • Immunology
  • Virology

Cite this

Cirone, M., Zompetta, C., Angeloni, A., Ablashi, D. V., Salahuddin, S. Z., Pavan, A., ... Faggioni, A. (1992). Infection by human herpesvirus 6 (HHV-6) of human lymphoid T cells occurs through an endocytic pathway. AIDS Research and Human Retroviruses, 8(12), 2031-2037.

Infection by human herpesvirus 6 (HHV-6) of human lymphoid T cells occurs through an endocytic pathway. / Cirone, M.; Zompetta, C.; Angeloni, A.; Ablashi, D. V.; Salahuddin, S. Z.; Pavan, A.; Torrisi, M. R.; Frati, L.; Faggioni, A.

In: AIDS Research and Human Retroviruses, Vol. 8, No. 12, 1992, p. 2031-2037.

Research output: Contribution to journalArticle

Cirone, M, Zompetta, C, Angeloni, A, Ablashi, DV, Salahuddin, SZ, Pavan, A, Torrisi, MR, Frati, L & Faggioni, A 1992, 'Infection by human herpesvirus 6 (HHV-6) of human lymphoid T cells occurs through an endocytic pathway', AIDS Research and Human Retroviruses, vol. 8, no. 12, pp. 2031-2037.
Cirone M, Zompetta C, Angeloni A, Ablashi DV, Salahuddin SZ, Pavan A et al. Infection by human herpesvirus 6 (HHV-6) of human lymphoid T cells occurs through an endocytic pathway. AIDS Research and Human Retroviruses. 1992;8(12):2031-2037.
Cirone, M. ; Zompetta, C. ; Angeloni, A. ; Ablashi, D. V. ; Salahuddin, S. Z. ; Pavan, A. ; Torrisi, M. R. ; Frati, L. ; Faggioni, A. / Infection by human herpesvirus 6 (HHV-6) of human lymphoid T cells occurs through an endocytic pathway. In: AIDS Research and Human Retroviruses. 1992 ; Vol. 8, No. 12. pp. 2031-2037.
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