Ovaries Might Take on an Immune Function After Menopause
Nautilus · 2026-07-01
Research by reproductive biologists led by Francesca Duncan of Northwestern University suggests that ovaries may transition from a reproductive role to an immune function after menopause. Published on July 1, 2026, the study on mice, whose ovaries also become quiescent around two years of age though lacking the human estrogen decline, involved analyzing ovaries from young, middle-aged, and post-reproductive mice. Post-reproductive mouse ovaries exhibited expected senescence, including follicle loss and increased collagen, but also showed significant infiltration by immune cells like T-cells and macrophages. Concurrently, these aging ovaries demonstrated increased transcription of pro-inflammatory proteins, implying a potential shift to an immune role with systemic impact. This discovery challenges the long-held assumption that post-reproductive ovaries are metabolically inert, instead indicating they acquire an "immune identity" capable of influencing whole-body aging through endocrine and paracrine mechanisms.
*The full article also explores the implications of these findings for understanding the broader aging process and potential therapeutic interventions.*