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Phenotypically Vif- human immunodeficiency virus type 1 is produced by chronically infected restrictive cells
M Bouyac1, F Rey, M Nascimbeni
1INSERM U372, Marseille, France.
Journal of Virology
|March 1, 1997
Summary
Generating replication-defective human immunodeficiency virus type 1 (HIV-1) vif-negative particles in restrictive cells is challenging. This study successfully produced these particles in H9 cells, aiding HIV-1 Vif function research.
Area of Science:
- Virology
- Molecular Biology
Background:
- Human immunodeficiency virus type 1 (HIV-1) Vif protein is crucial for viral replication in certain cell types.
- Replication of vif-mutant HIV-1 varies significantly between permissive and restrictive CD4+ T cell lines.
- Difficulty in producing stable, replication-defective vif-negative HIV-1 particles from restrictive cells hinders Vif function studies.
Purpose of the Study:
- To establish a method for producing replication-defective vif-negative HIV-1 particles in restrictive H9 cells.
- To characterize the properties of these produced viral particles.
- To facilitate further research into the role of Vif in the HIV-1 life cycle.
Main Methods:
- Infection of restrictive H9 cells with vif-negative, vpr-negative HIV-1 strain NDK stock from permissive SupT1 cells at high multiplicity.
- Analysis of viral particle production, infectious titer using single-cycle infectivity assays, and replication in different cell lines (H9, CEM, SupT1).
- Biochemical analysis of Gag protein processing (Pr55gag/p24 ratio) and Env incorporation.
- Morphological examination of viral particles using transmission electron microscopy.
Main Results:
- Persistent production of vif-negative HIV-1 particles in H9 cells was achieved, with significantly reduced infectious titers.
- These particles could not propagate in H9 cells but replicated normally in permissive CEM and SupT1 cells.
- Normal processing of Gag proteins and Env incorporation were observed.
- Particles exhibited abnormal morphology, specifically a condensed nucleoid, despite normal protein content.
Conclusions:
- Chronically infected restrictive cell lines can stably produce phenotypically vif-negative HIV-1 particles.
- These particles, though morphologically distinct, are valuable tools for studying HIV-1 Vif function.
- The methodology overcomes previous limitations in generating replication-defective viral stocks for Vif research.