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. 1992 Aug;66(8):4794–4802. doi: 10.1128/jvi.66.8.4794-4802.1992

Complementation of murine cells for human immunodeficiency virus envelope/CD4-mediated fusion in human/murine heterokaryons.

T Dragic 1, P Charneau 1, F Clavel 1, M Alizon 1
PMCID: PMC241307  PMID: 1629956

Abstract

Murine cell lines expressing human CD4 are resistant to the fusogenic effect of the human immunodeficiency virus (HIV) envelope. Consequently, they cannot be infected by HIV or form syncytia with HIV envelope-expressing cells. Murine cells could either lack human-specific cofactors necessary for the CD4/envelope-mediated membrane fusion or express inhibitors of this process. To address this question, we have tested the ability of heterokaryons made from CD4-expressing murine cells and human cells to undergo HIV envelope-mediated fusion. We have devised a rapid and specific assay based on the induction of lacZ expression, in which membrane fusion events with HIV-infected cells can be detected by a simple histochemical technique. CD4-positive murine/human heterokaryons, but not murine/simian heterokaryons, were found able to fuse with HIV envelope-expressing cells. In these experiments, the fusion resistant phenotype of murine-CD4 cells could be complemented by human cellular factors.

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Selected References

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