Ovaries have traditionally been viewed as organs that largely shut down once menopause brings fertility to an end. However, new research suggests that rather than becoming biologically inactive, they undergo significant changes in function that may influence how the entire body ages.
A study led by researchers from Northwestern University and the Buck Institute for Research on Aging has examined protein activity in healthy postmenopausal ovaries. The findings suggest that menopause represents not simply the end of ovarian function but a transition toward a different physiological role.
How ovaries change after menopause
Researchers examined ovaries removed from 28 postmenopausal women aged 50 and older, none of whom had detectable disease. Using mass spectrometry, they analyzed protein activity in ovarian tissue from women in their 50s, 60s and 70s or older.
The team identified a core group of 17 proteins whose activity changed consistently with age. Among women aged 50 to 59, ovarian tissue contained higher levels of proteins involved in RNA and DNA regulation, as well as those responsible for maintaining cellular and tissue structure.
By contrast, ovaries from women older than 70 showed greater levels of proteins associated with lipid metabolism, innate immune responses and inflammation. These differences suggest that the organ continues to adapt and interact with other biological systems rather than becoming completely inactive.
The same research group had previously identified similar age-related changes in protein activity in mouse ovaries. Observing comparable patterns in humans strengthens the possibility that these changes represent a fundamental biological process shared across species.
Implications for ovarian cancer risk
Ovarian cancer risk increases substantially after menopause, although the biological mechanisms behind this pattern remain only partly understood. The new findings suggest that age-related changes in ovarian tissue may contribute to this increased vulnerability.
As ovaries age, their extracellular matrix becomes more fibrotic and enriched with collagen, while local immune activity increasingly reflects chronic, low-level inflammation. Such conditions are known to create an environment that can support tumor growth and survival.
Although none of the ovarian samples contained detectable tumors, researchers identified elevated levels of proteins previously associated with ovarian cancer. These cancer-related proteins were particularly prominent in tissue collected from women in their 60s.
The authors propose that ovarian aging may act as a potential “third hit” in the development of ovarian cancer, alongside genetic susceptibility and environmental exposures. If future research supports this model, targeting age-related changes in ovarian tissue could provide new opportunities for cancer prevention.
What this means for women’s health
As life expectancy continues to rise, women spend an increasingly large proportion of their lives after menopause. The findings highlight how little researchers have understood about ovarian biology during these later decades and the potential importance of the organ to overall health.
Because signaling from the ovaries can influence the brain, bones and metabolic systems, changes in ovarian protein activity may help explain certain health problems associated with menopause. These include declining bone density, metabolic changes and potentially alterations in cognitive function.
A clearer understanding of the molecular changes occurring in aging ovaries could support the development of biomarkers for earlier ovarian cancer detection. It may also help guide hormone therapies or other treatments aimed at reducing cancer risk and limiting age-related tissue damage.
The study, published in Aging Cell, provides an initial molecular roadmap rather than definitive answers. Researchers emphasize that larger and more diverse participant groups, together with long-term clinical follow-up, will be necessary before these findings can be translated into practical medical applications.
Nevertheless, the research challenges the longstanding assumption that ovaries become biologically silent after menopause. Instead, they appear to remain active participants in the complex biological processes that influence how women age.
