A team led by Sun Yat-sen University demonstrates that the ketogenesis enzyme HMGCS2 in Leydig cells generates β-hydroxybutyrate to epigenetically boost FOXO3a and delay cellular senescence, preserving testosterone output and testicular function.
Key points
- Single-cell RNA-seq of young vs. aged mouse testes reveals Hmgcs2 downregulation in senescent Leydig cells.
- Pharmacological inhibition or genetic knockout of HMGCS2 in Leydig cells reduces ketone bodies, induces p21-driven senescence, and impairs testosterone synthesis.
- β-Hydroxybutyrate supplementation or Hmgcs2 overexpression restores H3K9 acetylation via HDAC1 inhibition, upregulates FOXO3a, and mitigates testicular aging.
Why it matters: Identifying ketogenesis in Leydig cells as a key anti-aging pathway unveils a novel target for therapies to preserve male reproductive function during aging.
Q&A
- What is ketogenesis in Leydig cells?
- How does β-hydroxybutyrate prevent cell senescence?
- Why target HMGCS2 for testicular aging?