Ovarian aging research has long centered on oocyte quality and granulosa cell decline, but a comprehensive transcriptomic-informed analysis repositions theca cells — the follicle's primary androgen producers — as active orchestrators of the process. Single-cell transcriptomic data reveal age-dependent upregulation of senescence regulators CDKN1A and NF-κB, alongside downregulation of FOXP1, a transcription factor that normally suppresses cellular senescence by directly repressing CDKN1A. Senescent theca-interstitial cells release CCL5, TNF-α, IL-1β, and IL-6, which suppress steroidogenic gene expression, trigger granulosa cell apoptosis, and accelerate ovarian fibrosis. Mitochondrial dysfunction via aberrant GSK3β activation further impairs oxidative phosphorylation and steroid synthesis, while PTEN/PI3K/Akt/FOXO1 dysregulation severs LH-dependent signaling.
This mechanistic reframing carries meaningful clinical weight. Theca dysfunction offers a unifying explanation for premature ovarian insufficiency, diminished ovarian reserve, and polycystic ovary syndrome — conditions currently managed symptomatically with limited mechanistic precision. The SASP-driven inflammatory microenvironment theca cells create mirrors senescence dynamics increasingly recognized across aging tissues, connecting reproductive aging to broader geroscience frameworks. Senolytic compounds, GSK3β inhibitors, and mitochondria-targeted antioxidants already exist in various stages of clinical investigation for non-reproductive conditions, making translational repurposing plausible. Critically, the evidence reviewed is predominantly preclinical; human causal data remain sparse. As a review rather than primary trial, the paper synthesizes rather than generates novel data — but its value lies in consolidating a paradigm shift that warrants urgent prospective human study, particularly around theca-specific biomarkers for ovarian reserve assessment.
