Rescuing cellular function in Fuchs endothelial corneal dystrophy by healthy exogenous mitochondrial internalization

Area of Science:

• Ophthalmology
• Cell Biology
• Mitochondrial Medicine

Background:

• Fuchs endothelial corneal dystrophy (FECD) involves accelerated loss of corneal endothelial cells, leading to corneal edema and vision loss.
• Mitochondrial dysfunction, specifically 'mitochondrial burnout,' is central to FECD pathogenesis, creating a detrimental cycle of cell death.
• Current treatments like corneal transplantation face supply limitations, necessitating alternative therapeutic strategies.

Purpose of the Study:

• To investigate the therapeutic potential of incorporating healthy exogenous mitochondria into FECD cells.
• To determine if exogenous mitochondria can ameliorate key pathological molecular markers associated with FECD.

Main Methods:

• Utilized corneal endothelium explants from FECD patients.
• Co-incubated FECD cells with exogenous healthy mitochondria.
• Assessed changes in oxidative stress, mitochondrial membrane potential, mitophagy, and apoptosis.

Main Results:

• Exogenous mitochondria incorporation reduced oxidative stress and mitophagy in FECD cells.
• Increased mitochondrial membrane potential was observed following mitochondria internalization.
• Apoptosis was significantly reduced (from 57% to 12%) in FECD cells treated with exogenous mitochondria.

Conclusions:

• Internalization of exogenous mitochondria effectively reverses the pathological vicious cycle in FECD.
• This approach presents a novel and much-needed therapeutic alternative for Fuchs endothelial corneal dystrophy.
• Targeting mitochondrial health offers a promising avenue for treating corneal endothelial cell loss diseases.