Ovarian Aging Mechanisms and Implications in Reproductive Health

Ovarian ageing is characterised by a progressive decline in both the quantity and quality of oocytes, leading to diminished fertility, altered endocrine function and the onset of menopause. Central mechanisms include the depletion of primordial follicles, accrual of DNA damage, mitochondrial dysfunction, chronic low-grade inflammation and remodelling of the extracellular matrix. As ovarian reserve diminishes, hormonal imbalances emerge—most notably reductions in oestrogen and anti‐Müllerian hormone alongside rises in gonadotrophins—contributing to systemic effects such as metabolic dysregulation and increased risk of chronic disease. Recent advances in single‐cell transcriptomics, biomechanical measurements and interventional studies have delineated the cellular and molecular drivers of ovarian decline, revealing key roles for immune cell infiltration, fibrotic stiffening of the stroma and alterations in proteostasis. These insights hold promise for novel therapies aimed at prolonging reproductive lifespan, improving assisted-reproduction outcomes and mitigating health risks associated with early ovarian failure.

Research from Nature Portfolio

Recent single-cell transcriptomic mapping of ageing mouse ovaries has revealed dramatic shifts in cellular composition and gene expression long before follicle exhaustion. In reproductively aged tissue, immune cells—particularly lymphocytes—double in number, while stromal fibroblasts show downregulation of collagenase pathways that coincides with progressive fibrotic stiffening. Follicular cells display activation of stress-response, immunogenic and fibrotic signalling, pinpointing early drivers of ovarian decline.

Complementary studies in mouse models of reproductive ageing have interrogated inflammatory mediators and immune populations across the ovarian lifespan. With advancing age, intra-ovarian levels of pro-inflammatory cytokines (including IL-1α/β, TNF-α and IL-6) and immune cells (CD4 T cells, B cells and macrophages) rise significantly. Although fibrosis markers remained stable in some cohorts, the data collectively implicate chronic inflammation as a key regulator of follicle depletion and oocyte quality deterioration.

Ovarian Aging Mechanisms and Implications in Reproductive Health publication trend

The graph below shows the total number of articles in ovarian aging mechanisms and implications in reproductive health across all publications each year (not limited to Nature Index journals).

Technical terms

Primordial follicle: A dormant oocyte enveloped by a single layer of granulosa cells, representing the reserve pool for future ovulation.

Single-cell RNA sequencing (scRNA-seq): A technique for profiling gene expression in individual cells, enabling identification of cell-type-specific changes.

Pyroptosis: A form of programmed cell death associated with inflammatory cytokine release, often mediated by gasdermin proteins.

Extracellular matrix: A complex network of proteins and polysaccharides that provides structural support and biochemical signalling in tissues.

Fibrosis: Excessive deposition of extracellular matrix components, such as collagen, leading to tissue stiffening and functional decline.

Mesenchymal stem cells: Multipotent stromal cells capable of differentiating into multiple cell types and modulating immune and reparative processes.

References

1. A single-cell atlas of the aging mouse ovary. Nature Aging (2024).
2. Single‐Cell Atlas of Human Ovaries Reveals The Role Of The Pyroptotic Macrophage in Ovarian Aging. Advanced Science (2023).
3. Stem cell transplantation extends the reproductive life span of naturally aging cynomolgus monkeys. Cell Discovery (2024).
4. Ovarian stiffness increases with age in the mammalian ovary and depends on collagen and hyaluronan matrices. Aging Cell (2020).
5. Evaluation of inflammation and follicle depletion during ovarian ageing in mice. Scientific Reports (2021).
6. Ovarian ageing and the impact on female fertility. F1000Research (2018).
7. Age‐associated dysregulation of protein metabolism in the mammalian oocyte. Aging Cell (2017).