Menopause: A Closer Look at Ovarian Function
For a long time, menopause has been viewed as the final stage for a woman’s reproductive system—a time when ovaries stop releasing eggs, marking, well, the end of the line. But, it seems that this straightforward view is not quite accurate. Researchers are digging deeper into what actually happens to the ovaries post-menopause, and the findings are quite interesting.
According to reproductive biologist Francesca Duncan from Northwestern University, most people might think that once the ovaries cease egg production, they become inactive, much like the appendix. However, this isn’t the whole story. Birgit Schilling, a proteomics expert at the Buck Institute, argues that the ovaries play a much broader role in the body. She points out that they actually have connections to other organs, including the brain and bones. After menopause, many women face various bone issues, so it’s likely that there’s an intricate relationship between these organs.
Schilling and Duncan recently published findings in the journal Aging Cell that propose a new perspective: menopause may not be retirement but rather a career change for the ovaries.
To understand this, researchers used mass spectrometry to analyze protein activity in the ovarian tissue of 28 postmenopausal women. These women had their ovaries surgically removed for different medical reasons, but importantly, none had signs of disease. Their findings echoed an earlier study involving mice, showing that protein profiles in ovarian tissues change with age. They identified a specific set of seventeen proteins that marked these changes.
Interestingly, ovaries from women aged 50-59 showed a higher concentration of proteins related to DNA and RNA regulation, while those from women over 70 displayed proteins linked to inflammation and lipid metabolism. If ovaries were as inert as commonly believed, we wouldn’t see such variations.
Duncan had initially expected that ovaries across different age groups would appear the same—aging without any significant activity. Instead, the consistency of these findings across species indicates that something meaningful is transforming in ovarian biology.
As life expectancies continue to rise, the number of postmenopausal women grows, unveiling a body of knowledge that is still largely unexplored. With a heightened risk of ovarian cancer observed after menopause, Duncan notes that their research sheds light on why that might occur. The age-related changes in ovarian tissue and immune cells appear to create a tumor-friendly environment, characterized by an abundance of collagen.
While the tissue samples analyzed in this study were clear of tumors, there were still many proteins associated with ovarian cancer, especially in the ovaries of women in their 60s. Duncan emphasizes that not all postmenopausal women will develop ovarian cancer, but the inflammatory environment in aging ovaries tends to attract cancer cells. This sets up a potential third factor for ovarian cancer—beyond the genetic and environmental triggers.
With a clearer understanding of ovarian aging now in place, researchers can ask more detailed questions. The implications of these findings could be significant for healthcare strategies focusing on women in their post-reproductive years, and also for those who have elective ovary removal.
The research has been documented in Aging Cell.
