Human vellus hair units undergo cellular and metabolic remodeling during skin aging
A single-nucleus atlas reveals stem cell loss, altered sebocyte activity, and shifted immune interactions in the hair follicles of older men.
Advanced science (Weinheim, Baden-Wurttemberg, Germany) · Li Y et al. · Paper published 29 Sep 2026
In a study of healthy young and aged human males, researchers constructed a single-nucleus transcriptomic atlas of vellus hair pilosebaceous units from back skin. They mapped widespread cellular and transcriptional remodeling across this niche during aging. Aged units showed a reduced relative representation of bulge hair follicle stem cells, alongside altered regeneration-associated transcriptional programs. In contrast, sebocytes exhibited heightened androgen responsiveness and increased lipid biosynthetic activity. The researchers also detected an expanded ion channel-enriched follicular cell population marked by stress and inflammatory signatures. Additionally, an innate immune-like melanocyte subset declined, coinciding with shifted melanocyte-immune communication patterns. Immune subsets in aged follicles showed coordinated alterations in metabolic pathway signatures, highlighting the unit as a convergence site for epithelial, immune, and metabolic aging.
Why it matters
The atlas reveals how aging alters human hair follicle stem cells, lipid metabolism, and local immune signaling in understudied vellus skin niches. Understanding these coordinated cellular changes could help explain age-associated cutaneous inflammation and tissue decline.
Caveats
The study is observational and restricted to back skin samples from human males, leaving generalizability across sexes, body sites, and broader populations to be determined.
Written from the paper’s abstract, and every claim checked against it before publishing. Read the paper for the full methods and data.
The paper
Single-Nucleus Transcriptomic Atlas of Human Vellus Hair Pilosebaceous Units Reveals Age-Associated Remodeling
Li Y, Qiu Z, Pan X et al.
Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 29 Sep 2026 · Peer-reviewed
- Relevance
- Core geroscience
- News value
- Notable
- Evidence
- Humans
- Status
- Peer-reviewed
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