AMID growing concerns over recent HIV outbreak patterns, uncontrolled infection rapidly advances biological aging across proteomes. Leveraging longitudinal data spanning more than 17 years from the Swiss HIV Cohort Study, investigators demonstrated that untreated viremia produces an average of 5.99 years of accelerated biological senescence. The investigation evaluated an independent cohort of 80 individuals with paired plasma samples collected before and during therapy. By establishing a specialized clock utilizing 416 protein abundances, researchers tracked proteomic aging in HIV, demonstrating that premature decay begins reversing promptly once suppressive antiretroviral therapy starts. Significant deceleration was observed within a median of 1.55 years post-initiation, with models projecting convergence toward chronological baseline after roughly 16.4 years.
For clinicians evaluating rheumatologic and systemic inflammatory conditions, the molecular architecture of this proteomic shift delivers notable clinical value. Network and pathway enrichment analyses showed that proteomic aging in HIV is heavily concentrated in complement cascade activation, coagulation pathways, and xenobiotic metabolism. These pathways parallel the persistent microvascular endothelial irritation and immune complex pathology commonly seen in chronic autoimmune disorders. This functional overlap highlights how unchecked viral replication drives multisystem rheumatologic deterioration. Furthermore, circulating plasma proteins captured acute inflammatory perturbations far more rapidly than epigenetic clocks, exhibiting pronounced age advancement during untreated infection that decelerates sharply following viral suppression.
Crucially, causal mediation modeling revealed that the reversal of proteomic aging in HIV is driven by plasma viral load suppression rather than standard peripheral CD4+ or CD8+ T-cell recovery. Neither absolute CD4+ counts nor CD4 to CD8 ratios significantly mediated this reduction in biological age. This distinction indicates that standard lymphocyte counts fail to reflect the resolution of underlying tissue-level vascular inflammation and systemic hypercoagulability. As clinicians respond to modern outbreak patterns, these findings emphasize the clinical necessity of prompt treatment initiation to suppress viremia, quiet complement pathways, and protect long-term musculoskeletal and vascular integrity.
Reference
Ryan B et al. A Plasma Proteomic Ageing Clock Reflects Advanced Ageing in People with Untreated HIV and its Reduction Under Antiretroviral Therapy. medRxiv. 2026;doi:10.64898/2026.03.24.26348875.
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