CoQ10 ameliorates mitochondrial dysfunction in diabetic nephropathy through mitophagy

Area of Science:

• Mitochondrial biology
• Nephrology
• Molecular signaling

Background:

• Diabetic nephropathy (DN) involves mitochondrial dysfunction, including defective mitophagy and increased mitochondrial reactive oxygen species (mtROS).
• The precise molecular mechanisms of Coenzyme Q10 (CoQ10) in DN are not fully understood.
• Mitochondrial abnormalities in DN contribute to glomerular damage and apoptosis.

Purpose of the Study:

• To investigate the role of CoQ10 in mitigating mitochondrial dysfunction and apoptosis in diabetic nephropathy (DN).
• To elucidate the molecular signaling pathways, particularly mitophagy and Nrf2 activation, involved in CoQ10's renoprotective effects.

Main Methods:

• Utilized db/db mice and high glucose (HG)-treated murine glomerular endothelial cells (mGECs) to model DN.
• Assessed mitochondrial function, mitophagy markers (PINK, parkin), apoptosis, and Nrf2 signaling.
• Investigated the effects of CoQ10, mitophagy inhibitors (Mdivi-1, siPINK), and an Nrf2 inhibitor (ML385).

Main Results:

• CoQ10 administration reversed mitochondrial abnormalities, reduced apoptosis, and improved mitophagy in DN models.
• CoQ10 restored Nrf2 expression, activity, and nuclear translocation in HG-mGECs.
• CoQ10's renoprotective effects were dependent on mitophagy activation and Nrf2 signaling, and involved modulation of mtROS.

Conclusions:

• CoQ10 exerts renoprotective effects in diabetic nephropathy (DN) by enhancing mitophagy and activating the Nrf2/ARE signaling pathway.
• CoQ10 acts as a mitochondrial antioxidant, mitigating mtROS production and improving mitochondrial function.
• Restoration of mitophagy and Nrf2 signaling by CoQ10 represents a promising therapeutic avenue for DN.