Oxidative status predicts quality in human mesenchymal stem cells.

Area of Science:

• Stem Cell Biology
• Mitochondrial Function
• Cellular Bioenergetics

Background:

• Human bone marrow-derived mesenchymal stem cells (MSC) hold therapeutic promise but face limitations due to replicative senescence and patient variability.
• Large cell numbers are required for MSC therapies, and in vitro expansion can lead to senescence, impacting cell quality.
• Patient variability complicates the establishment of standardized quality control for MSC intended for transplantation.

Purpose of the Study:

• To investigate the correlation between the oxidative status of MSC and their expansion and differentiation potential.
• To determine if oxidative status influences the suitability of MSC for cell-based therapies.
• To assess the effect of methylene blue (MB) on senescence-induced changes in MSC oxidative status and function.

Main Methods:

• Assessed mitochondrial function, including metabolic activity and antioxidant enzyme expression in MSC.
• Evaluated the impact of methylene blue (MB) on MSC bioenergetics and oxidative status.
• Categorized MSC as 'weak' or 'vigorous' based on colony-forming units (CFU) and in vitro lifespan.

Main Results:

• Vigorous MSC exhibited lower mitochondrial membrane potential, reduced mitochondrial activity, and fewer reactive oxygen species compared to weak MSC.
• Vigorous MSC demonstrated significantly higher expansion potential than weak MSC, with no differentiation differences observed.
• Methylene blue treatment enhanced expansion and differentiation potential, but only in vigorous MSC.

Conclusions:

• Mitochondrial function is crucial for MSC in vitro behavior and therapeutic potential.
• MSC with a low oxidative status are more suitable candidates for cell-based therapies.
• Targeting mitochondrial function may improve MSC quality for therapeutic applications.