Ovarian Identity Shifts Toward Immune Profile After Menopause

Recent scientific studies have identified that ovaries undergo active molecular changes after menopause, shifting from a reproductive to an immune-dominant profile in both mice and humans.

In mouse models, researchers observed that ovaries from post-reproductive individuals lose their reproductive cellular features and display increased infiltration by immune cells such as T cells, macrophages, and multinucleated giant cells. These findings were supported by transcriptomic and histological analyses conducted at different ages, which showed stromal remodeling and increased collagen deposition in the ovaries of older mice.

Further investigation using single-cell and spatial transcriptomic techniques in aging mouse ovaries revealed that specific macrophage and T cell subpopulations become prominent sources of pro-inflammatory signals. Elevated levels of pro-inflammatory cytokines and inflammasome genes were also detected in aging C57BL/6 mouse ovaries, indicating a shift in cellular activity.

In human studies, proteomic profiling of ovaries from individuals aged 50 to 75 demonstrated progressive increases in proteins associated with inflammation, extracellular matrix (matrisome), and damage-associated secretory pathways. These molecular changes suggest ongoing tissue remodeling and immune activity after menopause.

What the numbers show

• Mouse ovaries were analyzed at 2, 18, and 24 months of age for transcriptomic changes
• Human post-menopausal ovarian samples ranged from ages 50 to 75 in proteomic studies
• In C57BL/6 mice, increased intra-ovarian CD4+ T cells, B cells, and macrophages were detected with age

The research challenges earlier assumptions that post-menopausal ovaries are biologically inactive. Instead, the studies indicate that these organs continue to undergo molecular remodeling, which includes increased immune cell activity and structural changes in the tissue.

Findings from both mouse and human studies highlight the presence of immune-related gene expression and protein abundance in post-reproductive ovaries. This includes increased levels of inflammatory cytokines such as IL-1α/β, TNF-α, IL-6, and inflammasome components ASC and NLRP3 in mice.

According to the published studies, the observed molecular and cellular changes in post-menopausal ovaries may have implications for inflammation and signaling between organs. The shift toward an immune-dominant profile was consistently noted across different research methods and species.

Collectively, these findings provide new insights into ovarian biology after menopause and suggest that the organ remains active in processes related to immune function and tissue remodeling, rather than becoming inert as previously thought.

* This article is based on publicly available information at the time of writing.