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Equine metabolic syndrome (EMS) is mainly characterized by insulin resistance, obesity, and local or systemic inflammation. That unfriendly environment of adipose tissue has huge impact on stem cells population (ASC) residing within. In the present study, using molecular biology techniques and multiple imaging techniques (SEM, FIB-SEM, and confocal microscopy), we evaluated the impact of EMS on ASC viability and chondrogenic differentiation. Moreover, we visualized the mitochondrial network and dynamics in ASC CTRL  and ASC EMS  during control and chondrogenic conditions. In control conditions, ASC EMS  were characterized by increased mitochondrial fission in comparison to ASC CTRL . We found that extensive remodeling of mitochondrial network including fusion and fission occurs during early step of differentiation. Moreover, we observed mitochondria morphology deterioration in ASC EMS . These conditions seem to cause autophagic shift in ASC EMS , as we observed increased accumulation of LAMP2 and formation of multiple autophagosomes in those cells, some of which contained dysfunctional mitochondria. “Autophagic” switch may be a rescue mechanism allowing ASC EMS  to clear impaired by ROS proteins and mitochondria. Moreover it provides a precursors-to-macromolecules synthesis, especially during chondrogenesis. Our data indicates that autophagy in ASC EMS  would be crucial for the quality control mechanisms and maintenance of cellular homeostasis ASC EMS  allowing them to be in “stemness” status.

oxidative medicine and cellular longevity

Macroautophagy and Selective Mitophagy Ameliorate Chondrogenic Differentiation Potential in Adipose Stem Cells of Equine Metabolic Syndrome: New Findings in the Field of Progenitor Cells Differentiation