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In Vitro Assay to Evaluate the Impact of Immunoregulatory Pathways on HIV-specific CD4 T Cell Effector Function
Published on: October 15, 2013
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Retinoids enhance NK effector function against HIV-infected CD4 T cells.
Elyse K McMahon1, Jonathan Locher1, Rebecca M Lynch1
1Department of Microbiology, Immunology and Tropical Medicine, George Washington University, Washington, DC, USA.
Journal of Virology
|January 27, 2026
Summary
Certain vitamin A derivatives, known as retinoids, enhance the immune system
Area of Science:
- Immunology
- Virology
- Pharmacology
Background:
- Latent reservoirs of HIV-1 are a major barrier to curing HIV infection.
- Retinoids, vitamin A derivatives, exhibit antiproliferative and proapoptotic activities.
- Several retinoids are FDA-approved or in clinical trials for various conditions.
Purpose of the Study:
- To investigate the potential of vitamin A and its derivatives to sensitize HIV-infected CD4 T cells to immune-mediated cell death.
- To evaluate the enhancement of natural killer (NK) cell cytotoxicity and antibody-dependent cellular cytotoxicity (ADCC) against HIV-infected cells by retinoids.
Main Methods:
- Screening of vitamin A, three natural metabolites, and nine synthetic retinoids for their ability to enhance NK cell activity.
- Assessment of NK cell degranulation and CD16 expression on NK cells.
- Evaluation of ADCC against HIV-infected target cells.
Main Results:
- Alitretinoin, tazarotene acid, and AM80 significantly enhanced NK cell-mediated cytotoxicity against HIV-infected cells.
- These retinoids promoted NK cell degranulation in an HLA-F/KIR3DS1-dependent manner.
- Retinoids increased ADCC by upregulating CD16 expression on NK cells.
Conclusions:
- Alitretinoin, tazarotene acid, and AM80 are identified as potent enhancers of NK cell cytotoxicity and ADCC against HIV-infected cells.
- These retinoids offer a potential strategy to target and reduce persistent HIV reservoirs.
- Further investigation of retinoids could lead to novel therapeutic approaches for HIV eradication.
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