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Updated: Jun 10, 2026

Pairwise Growth Competition Assay for Determining the Replication Fitness of Human Immunodeficiency Viruses
Published on: May 4, 2015
HIV-1 infection: functional competition between gp41 and interleukin-2
Kamel Sanhadji1, Jean-Claude Tardy, Jean-Louis Touraine
1Laboratoire des déficits immunitaires et d'immunovirologie, faculté de médecine RTH Laënnec, université Claude-Bernard-Lyon 1, 69372 Lyon cedex 08, France.
HIV-1 gp41 protein may hijack the interleukin-2 (IL-2) receptor on target cells, potentially mimicking IL-2
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- Interleukin-2 (IL-2) is crucial for T-cell proliferation.
- Human Immunodeficiency Virus type 1 (HIV-1) infects CD4(+) T lymphocytes.
Purpose of the Study:
- To investigate if HIV-1 gp41 protein interacts with the IL-2 receptor.
- To explore functional mimicry between gp41 and IL-2.
Main Methods:
- In vitro analysis of gp41 (peptides, trimers) competition with IL-2.
- Assay of IL-2/HIV-1 interaction on IL-2-dependent CTLL2 and MT4 cells.
Main Results:
- HIV-1 gp41 trimeric molecule and a specific peptide inhibited CTLL2 cell proliferation.
- HIV-1 patient serum antibodies abolished gp41 inhibition.
- IL-2 and HIV-1 co-incubation decreased HIV-1 p24 release by 70% in MT4 cells.
Conclusions:
- HIV-1 gp41 may utilize the IL-2 receptor for infection.
- Functional mimicry between gp41 and IL-2 is suggested.
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