Fusion of EBV with the surface of receptor-negative human hepatoma cell line Li7A permits virus penetration and infection

A. Lisi, D. Pozzi, G. Carloni, G. Da Villa, S. Iacovacci, M. B. Valli, S. Grimaldi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Our preliminary data suggest that Epstein-Barr virus (EBV) is able to bind to and fuse with the surface membranes of hepatoma cell line Li7A. In order to obtain further evidence, we utilized the relief of rhodamine fluorescence to monitor whether fusion would also take place when Li7A cells were exposed to experimental conditions such as neutral or low pH. It is well known that for some viruses, protonation in the endosomal compartment is needed to trigger the fusion. We show, furthermore, that the rate and extent of fusion are not affected by pretreatment of the cells with agents known to elevate the lysosomal and ensodomal pH, such as chloroquine or NH4Cl (lysosomotropic agent). By indirect immunofluorescence assay, in addition, we confirmed the binding of the EBV to the Li7A cell surface membrane. We attempted finally to correlate the above processes with successful infection of Li7A cells by EBV detected using the polymerase chain reaction technique. In spite of the apparent lack of viral receptor CD21, these nonlymphoid cells appeared susceptible to EBV penetration and infection through fusion with the plasma membrane at the surface of the cells.

Original languageEnglish
Pages (from-to)295-300
Number of pages6
JournalResearch in Virology
Volume146
Issue number4
DOIs
Publication statusPublished - 1995

Fingerprint

Virus Diseases
Human Herpesvirus 4
Hepatocellular Carcinoma
Cell Line
Cell Membrane
Epstein-Barr Virus Infections
Rhodamines
Chloroquine
Indirect Fluorescent Antibody Technique
Fluorescence
Viruses
Polymerase Chain Reaction
Membranes
Infection

Keywords

  • Cell infection
  • EBV
  • Hepatocarcinoma
  • Li7A
  • Membrane fusion

ASJC Scopus subject areas

  • Immunology
  • Virology

Cite this

Fusion of EBV with the surface of receptor-negative human hepatoma cell line Li7A permits virus penetration and infection. / Lisi, A.; Pozzi, D.; Carloni, G.; Da Villa, G.; Iacovacci, S.; Valli, M. B.; Grimaldi, S.

In: Research in Virology, Vol. 146, No. 4, 1995, p. 295-300.

Research output: Contribution to journalArticle

Lisi, A. ; Pozzi, D. ; Carloni, G. ; Da Villa, G. ; Iacovacci, S. ; Valli, M. B. ; Grimaldi, S. / Fusion of EBV with the surface of receptor-negative human hepatoma cell line Li7A permits virus penetration and infection. In: Research in Virology. 1995 ; Vol. 146, No. 4. pp. 295-300.
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AU - Lisi, A.

AU - Pozzi, D.

AU - Carloni, G.

AU - Da Villa, G.

AU - Iacovacci, S.

AU - Valli, M. B.

AU - Grimaldi, S.

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AB - Our preliminary data suggest that Epstein-Barr virus (EBV) is able to bind to and fuse with the surface membranes of hepatoma cell line Li7A. In order to obtain further evidence, we utilized the relief of rhodamine fluorescence to monitor whether fusion would also take place when Li7A cells were exposed to experimental conditions such as neutral or low pH. It is well known that for some viruses, protonation in the endosomal compartment is needed to trigger the fusion. We show, furthermore, that the rate and extent of fusion are not affected by pretreatment of the cells with agents known to elevate the lysosomal and ensodomal pH, such as chloroquine or NH4Cl (lysosomotropic agent). By indirect immunofluorescence assay, in addition, we confirmed the binding of the EBV to the Li7A cell surface membrane. We attempted finally to correlate the above processes with successful infection of Li7A cells by EBV detected using the polymerase chain reaction technique. In spite of the apparent lack of viral receptor CD21, these nonlymphoid cells appeared susceptible to EBV penetration and infection through fusion with the plasma membrane at the surface of the cells.

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