miR-26a-Targeting SLC7A11 Regulates Erastin-Induced Granulosa Cell Ferroptosis

Area of Science:

• Reproductive Medicine
• Cell Biology
• Molecular Endocrinology

Background:

• Ferroptosis, a regulated cell death, is implicated in ovarian dysfunction.
• MicroRNAs (miRNAs) are key regulators of ferroptosis pathways, including glutathione-GPX4, amino acid transport, and lipid metabolism.

Purpose of the Study:

• To investigate the role of miR-26a in regulating ferroptosis in ovarian granulosa cells.
• To identify the molecular targets of miR-26a involved in ferroptosis.

Main Methods:

• RNA sequencing to profile miRNA expression in erastin-treated oocytes and granulosa cells.
• Overexpression and knockdown of miR-26a in granulosa cells.
• Assessment of ferroptosis markers and SLC7A11 expression.

Main Results:

• miR-26a expression was significantly upregulated in erastin-induced ferroptosis.
• miR-26a overexpression promoted granulosa cell ferroptosis, while knockdown inhibited it.
• miR-26a directly targeted and suppressed SLC7A11, leading to increased ferroptosis.

Conclusions:

• miR-26a positively modulates ferroptosis in granulosa cells by targeting SLC7A11.
• This mechanism involves reduced glutathione synthesis and decreased antioxidant capacity.
• Targeting miR-26a may offer therapeutic potential for ovarian insufficiency and infertility.