MELAS-Derived Neurons Functionally Improve by Mitochondrial Transfer from Highly Purified Mesenchymal Stem Cells...

Area of Science:

• Neuroscience
• Mitochondrial Biology
• Stem Cell Therapy

Background:

• Mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episode (MELAS) syndrome is a common inherited mitochondrial disease causing neuronal damage.
• Current treatments for MELAS are limited, highlighting the need for novel therapeutic approaches.
• Previous research indicated mesenchymal stem cells (RECs) can restore mitochondrial function in deficient cells.

Purpose of the Study:

• To investigate if exogenous mitochondria can be donated to MELAS neurons.
• To determine the efficacy of RECs versus mesenchymal stem cells (MSCs) in mitochondrial transfer.
• To assess the functional recovery of MELAS neurons following mitochondrial donation.

Main Methods:

• Neurons with impaired mitochondrial function were generated from MELAS patients using induced pluripotent stem cells (iPSCs).
• MELAS neurons were co-cultured with RECs and MSCs under both contact and non-contact conditions.
• Mitochondrial function was assessed by measuring membrane potential, ATP/ROS production, calcium storage, and oxygen consumption.

Main Results:

• Both RECs and MSCs successfully donated mitochondria to MELAS neurons, with RECs demonstrating superior transfer efficiency.
• REC-mediated mitochondrial transfer significantly restored key mitochondrial functions in MELAS neurons.
• Improved mitochondrial function was sustained for at least three weeks post-transfer.

Conclusions:

• Exogenous mitochondria, particularly from RECs, can be effectively transferred to MELAS neurons.
• REC-mediated mitochondrial donation shows potential as a therapeutic strategy for MELAS-associated neurological dysfunction.
• This study provides evidence for mitochondrial transfer as a viable approach for treating inherited mitochondrial diseases.