Cannabis use in people with HIV on antiretroviral therapy was associated with less T-cell activation, exhaustion, and senescence, without affecting HIV-specific immune responses or the size of the latent viral reservoir.
Read this if you are living with HIV and want to understand how cannabis might affect your immune system.
Less activationCannabis users showed reduced T-cell activation, exhaustion, and senescence without affecting HIV control
What the researchers found
Comparing HIV-positive cannabis users to matched non-users on ART, cannabis use was associated with increased naive T cells, reduced effector T cells, and lower expression of activation markers. Cannabis users also had reduced levels of exhausted and senescent T cells. Critically, HIV-specific CD8 T-cell responses (the immune cells that fight HIV) were unaffected by cannabis use. Neither intact nor total HIV proviral DNA frequency in CD4 T cells differed between groups, indicating cannabis did not affect the latent reservoir.
Why it matters
The persistent immune activation in treated HIV contributes to aging-related diseases and poor health outcomes. If cannabis genuinely reduces this activation without impairing anti-HIV immunity or expanding the viral reservoir, it could have therapeutic implications.
The numbers in context
- Cannabis users vs matched non-users, both on ART
- Increased naive T cells in cannabis users
- Reduced effector T cells
- Reduced activation marker expression
- Reduced exhausted and senescent T cells
- No difference in HIV-specific CD8 responses
- No difference in intact or total HIV DNA
How the study worked
Cohort comparison of PWH who use cannabis vs matched non-users on ART. Evaluated T-cell maturation/activation markers, HIV-specific T-cell responses, and intact proviral DNA (IPDA assay) in CD4 T cells.
Who was studied
People with HIV on antiretroviral therapy, comparing cannabis users to matched non-users
What this study cannot tell us
Observational cross-sectional design cannot prove cannabis causes the immune differences. Cannabis users may differ from non-users in unmeasured ways. Peripheral blood may not fully represent tissue-resident immune populations. Amount, frequency, and type of cannabis use were not detailed.
How to read the evidence
Cohort comparison with matched controls and advanced immunological assays. Provides strong mechanistic data but observational design limits causal conclusions.
When this study was published
Published in 2023. Uses state-of-the-art intact proviral DNA assay to assess the HIV reservoir.
The bigger picture
Chronic immune activation in treated HIV accelerates aging and increases risk of cardiovascular disease, cancer, and neurodegeneration. Identifying safe interventions that reduce this activation is a major research priority, and cannabis's immunomodulatory properties make it an interesting candidate.
Questions still open
- Could cannabis be deliberately used as an anti-inflammatory adjunct in HIV treatment?
- Do the immune changes from cannabis use translate to clinical health benefits for PWH?
- Would CBD alone produce the same immune modulation without THC's psychoactive effects?
Read the original research
Impact of Cannabis Use on Immune Cell Populations and the Viral Reservoir in People With HIV on Suppressive Antiretroviral Therapy.
The Journal of infectious diseases, 228(11), 1600-1609
Citation
Falcinelli, Shane D; Cooper-Volkheimer, Alicia D; Semenova, Lesia; Wu, Ethan; Richardson, Alexander; Ashokkumar, Manickam; Margolis, David M; Archin, Nancie M; Rudin, Cynthia D; Murdoch, David; Browne, Edward P. (2023). Impact of Cannabis Use on Immune Cell Populations and the Viral Reservoir in People With HIV on Suppressive Antiretroviral Therapy.. The Journal of infectious diseases, 228(11), 1600-1609. https://doi.org/10.1093/infdis/jiad364