Menopause accelerates biological aging.
Level 3 - non-randomized controlled study
Multi-cohort observational study combined with Mendelian randomization analysis
PubMed 27457926 · doi:10.1073/pnas.1604558113
What was done
Analyzed DNA methylation-based epigenetic age acceleration across blood, saliva, and buccal epithelium using data from four cohorts totaling 3,110 participants: the Women's Health Initiative (n = 1,864), Invecchiare nel Chianti (n = 200), Parkinson's disease, Environment, and Genes (n = 256), and the UK MRC National Survey of Health and Development (n = 790). Associations were evaluated for age at menopause, bilateral oophorectomy, time since menopause, and menopausal hormone therapy. Coheritability and a two-SNP Mendelian randomization analysis were also performed.
What was found
Increased epigenetic age acceleration in blood was significantly associated with earlier menopause (P = 0.00091), bilateral oophorectomy (P = 0.0018), and longer time since menopause (P = 0.017). In non-blood tissues, natural age at menopause was not associated with epigenetic aging, though bilateral oophorectomy was associated with higher epigenetic age in saliva (P = 0.0079), and menopausal hormone therapy was associated with lower epigenetic age in buccal epithelium (P = 0.00078). Mendelian randomization using two SNPs associated with age at menopause demonstrated a significant association with blood epigenetic age acceleration. Numerical effect sizes and confidence intervals were not reported in the abstract.
Why it matters
This study provides molecular and genetic evidence that ovarian cessation accelerates systemic biological aging as measured by DNA methylation clocks, linking reproductive senescence to cellular aging.
Limits
The abstract reports p-values without effect sizes or confidence intervals. Results varied substantially across different tissue types (blood versus buccal epithelium and saliva). Mendelian randomization was limited to two SNPs, and detailed mechanistic pathways were not established.
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