PPARβ/δ-dependent MSC metabolism determines their immunoregulatory properties

Area of Science:

• Immunology
• Cell Biology
• Metabolic Engineering

Background:

• Mesenchymal stem cells (MSCs) possess immunoregulatory properties valuable for treating disorders.
• MSC plasticity necessitates precise control for clinical applications.
• PPARβ/δ is crucial for MSC immunomodulation, but its metabolic role is unknown.

Purpose of the Study:

• Investigate the role of PPARβ/δ in MSC metabolism.
• Determine the impact of metabolic control on MSC immunosuppressive functions.
• Explore strategies to enhance MSC therapeutic efficacy.

Main Methods:

• Analysis of PPARβ/δ-deficient MSCs.
• Assessment of metabolic activity, focusing on glycolysis and mitochondrial ATP production.
• Evaluation of MSC immunosuppressive capacity on T helper 1 (Th1) and T helper 17 (Th17) cells.

Main Results:

• PPARβ/δ deficiency induces metabolic adaptation in MSCs, increasing glycolysis.
• Increased glycolysis in deficient MSCs is essential for their immunoregulatory functions on Th1 and Th17 cells.
• Inhibiting mitochondrial ATP production in PPARβ/δ-expressing MSCs promotes aerobic glycolysis, enhancing immunosuppression.

Conclusions:

• PPARβ/δ dictates MSC metabolic reprogramming, thereby governing their immunoregulatory potential.
• Targeting PPARβ/δ and MSC metabolism offers a strategy to enhance therapeutic properties.
• This research provides insights for optimizing MSC-based therapies by controlling cellular metabolism.