Radiation-Induced Ovarian Dysfunction Mechanisms

Ionising radiation, employed in cancer therapies and diagnostic imaging, exerts profound effects on ovarian integrity and function. The ovary houses a finite pool of primordial follicles; exposure to radiation triggers DNA strand breaks within oocytes and surrounding somatic cells, initiating apoptotic programmes and depleting the follicular reserve. Radiation also induces oxidative stress via reactive oxygen species, disrupts growth factor signalling—particularly via the PI3K/Akt and TGF-β pathways—and provokes inflammatory responses that exacerbate stromal and vascular injury. Granulosa cell apoptosis and altered expression of transcription factors such as FOXL-2 compromise follicle maturation, leading to hormonal imbalances characterised by reduced oestradiol and anti-Müllerian hormone levels, with compensatory rises in follicle-stimulating hormone. Long-term sequelae include premature ovarian insufficiency, impaired fertility and systemic health consequences in survivors of childhood and adult cancers. Understanding these interconnected molecular and cellular mechanisms underpins the development of fertoprotective strategies and guides clinical approaches to preserve reproductive potential.

Research from Nature Portfolio

Recent studies have demonstrated that genistein, a phytoestrogen, mitigates radiation-induced ovarian damage by preserving primordial follicle populations and reducing atresia. This compound enhances endogenous antioxidant defences, upregulating glutathione and glutathione peroxidase, while modulating apoptosis through downregulation of Bax and caspase-3 and upregulation of Bcl-2. Mechanistically, genistein restores oestrogen receptor-β and FOXL-2 expression, suppresses TGF-β activity and stabilises follicle transition, offering insight into non-hormonal approaches to safeguard ovarian reserve following ionising radiation.

Radiation-Induced Ovarian Dysfunction Mechanisms publication trend

The graph below shows the total number of articles in radiation-induced ovarian dysfunction mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Primordial follicle: The earliest stage of ovarian follicle containing an immature oocyte surrounded by a single layer of granulosa cells.

Granulosa cell: Somatic cells within the ovarian follicle that nurture the oocyte and produce sex steroids in response to hormonal signals.

Oxidative stress: A cellular state in which the production of reactive oxygen species overwhelms antioxidant defences, causing damage to DNA, proteins and lipids.

Apoptosis: Programmed cell death characterised by DNA fragmentation, membrane blebbing and activation of caspases, leading to removal of damaged cells.

Anti-Müllerian hormone (AMH): A glycoprotein secreted by granulosa cells of developing follicles, used as a biomarker of ovarian reserve.

PI3K/Akt pathway: A signal transduction cascade that promotes cell survival and growth; dysregulation can lead to premature follicle activation and depletion.

TGF-β: Transforming growth factor-β, a cytokine involved in cell proliferation, differentiation and fibrotic responses within the ovary.

FOXL-2: A transcription factor critical for granulosa cell differentiation and maintenance of ovarian identity.

References

1. Phytoestrogen genistein hinders ovarian oxidative damage and apoptotic cell death-induced by ionizing radiation: co-operative role of ER-β, TGF-β, and FOXL-2. Scientific Reports (2020).
2. Etoricoxib–NLC Mitigates Radiation-Induced Ovarian Damage in Rats: Insights into Pro-Inflammatory Cytokines, Antioxidant Activity, and Hormonal Responses. Biomolecules (2024).
3. Unlaid Eggs: Ovarian Damage after Low-Dose Radiation. Cells (2022).
4. Folic Acid Preconditioning Alleviated Radiation-Induced Ovarian Dysfunction in Female Mice. Frontiers in Nutrition (2022).