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SIRT2 regulates apoptosis by inducing mitophagy in sheep cumulus cells
Xiaohuan Fang1, Wei Xia2, Yatian Qi1
1College of Animal Science and Technology, Hebei Agricultural University, Baoding, 071000, PR China.
Sirtuin 2 (SIRT2) regulates cumulus cell apoptosis by controlling mitophagy. Inhibiting mitophagy prevents apoptosis, and MAPK15 plays a key role in this SIRT2-mediated process.
Area of Science:
- Reproductive Biology
- Cellular Biology
- Molecular Biology
Background:
- Cumulus cells support oocyte maturation and quality.
- SIRT2 is known to regulate mitochondrial function in granulosa cells.
- The role of SIRT2 in mitophagy within cumulus cells is not well understood.
Purpose of the Study:
- To investigate the effect of SIRT2 on mitophagy in sheep cumulus cells.
- To explore the mechanisms by which SIRT2 influences apoptosis via mitophagy.
- To identify potential key regulators in the SIRT2-mitophagy-apoptosis pathway.
Main Methods:
- RNA sequencing (RNA-seq) to identify differentially expressed genes (DEGs) after SIRT2 knockdown.
- Treatment with mitophagy inhibitor Mdivi-1.
- Analysis of apoptosis markers (CASP3/CASP9), mitophagy markers, calcium levels, cytochrome C, mitochondrial morphology, ATP levels, and mtDNA copy numbers.
- Gene knockdown experiments, including double knockdown of SIRT2 and MAPK15.
Main Results:
- SIRT2 knockdown enriched DEGs in mitochondria, mitophagy, and apoptosis pathways.
- Mitophagy activation significantly increased CASP3/CASP9 expression, while inhibition did not affect apoptosis.
- Mdivi-1 pretreatment reversed SIRT2 knockdown-induced changes, reducing apoptosis markers and improving mitochondrial function.
- Double knockdown of SIRT2 and MAPK15 counteracted the effects of SIRT2 knockdown on mitophagy and apoptosis.
Conclusions:
- SIRT2 modulates apoptosis in cumulus cells through the regulation of mitophagy.
- MAPK15 appears to be a crucial mediator in the SIRT2-regulated mitophagy and apoptosis pathway.
- Targeting the SIRT2-MAPK15-mitophagy axis may offer strategies to improve oocyte quality.
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