Gut bacterial chemicals linked to immune aging in HIV
An observational study of 50 people with suppressed HIV linked immune-cell changes to cell-associated bacterial chemicals, not their levels in plasma.
Our read
Mechanisms- Studied:
- Cross-sectional study of 50 people with suppressed HIV-1 (Dose-response)
- What changed:
- Immune cells showed more aging-related gene activity with higher cell-associated p-cresol sulfate in people with HIV
- The catch:
- Detailed single-cell gene analysis included only six donors
- In the record:
- One of 8 papers on p-cresol sulfate on record: 4 with results in people.
Editor of record: Boris Djordjevic · AgingResearch.News
An observational study examined plasma, the liquid part of blood, and CD4 T cells, a type of immune cell, from 50 people with HIV-1 suppressed by antiretroviral therapy. Participants were aged 40–70, with a median age of 59; most were women. Bacterial chemicals associated with the cells, rather than plasma levels, were linked to altered cell metabolism and function. Higher cell-associated p-cresol sulfate was linked to gene activity associated with impaired cell specialization and senescence, a state in which cells stop dividing.
In separate experiments, CD4 T cells from five healthy donors received 0–100 micromoles per liter of p-cresol sulfate for six days. Exposure reduced cell division, disrupted mitochondria—the cells’ energy producers—and induced senescence-associated gene activity. In participants with HIV, metabolite-associated cell states also tracked with intact viral DNA levels.
Why it matters
The authors propose that these bacterial chemicals may favor immune-cell states linked to long-term HIV persistence, connecting immune aging with the virus’s ability to remain in the body.
Caveats
The human findings were observational and cannot establish cause and effect; the exposure experiments used cells grown in the lab. The clinical cohort had suppressed HIV, and detailed single-cell gene analysis included six donors.
- p-cresol sulfate
- Gut-derived bacterial metabolites
- Cell cycle regulation
- Cellular senescence
- HIV-1 infection
- Humans
The paper
Microbiome-derived metabolites shape CD4+ T cell differentiation and immune aging in HIV-1 infection
Department of Pathology and Laboratory Medicine
JCI Insight, Jul 21, 2026, Open access
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