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Human immunodeficiency virus can infect CD4-negative human fibroblastoid cells
M Tateno1, F Gonzalez-Scarano, J A Levy
1Cancer Research Institute, University of California, School of Medicine, San Francisco 94143.
Summary
Certain human immunodeficiency virus (HIV) strains infect fibroblastoid cells, suggesting a broader host range beyond CD4+ cells. This discovery highlights potential new viral entry mechanisms and reservoirs for HIV.
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- Human immunodeficiency virus (HIV) primarily infects cells expressing the CD4 receptor.
- Understanding HIV's cellular tropism and entry mechanisms is crucial for therapeutic development.
Purpose of the Study:
- To investigate the infectivity of certain HIV strains in human fibroblastoid cells.
- To explore the mechanisms of HIV entry into non-CD4+ cells.
- To assess the potential of fibroblastoid cells as an HIV reservoir.
Main Methods:
- Infection of human fibroblastoid cells with specific HIV strains.
- Coculturing infected fibroblastoid cells with peripheral blood mononuclear cells or T-cell lines to assess replication.
- Neutralization assays using human sera against HIV in fibroblastoid versus T-cell lines.
Main Results:
- HIV strains were demonstrated to infect human fibroblastoid cells.
- Viral replication in fibroblastoid cells required coculturing with susceptible human cells.
- Infection did not involve CD4 molecule binding or endocytosis.
- Human sera showed differential neutralization capabilities against HIV in fibroblastoid vs. T-cell lines.
Conclusions:
- HIV entry mechanisms beyond CD4 binding are essential considerations.
- HIV exhibits a wider cellular host range and greater strain heterogeneity than previously assumed.
- Fibroblastoid cells may act as a viral reservoir, potentially linking HIV to connective tissue disorders.