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Metabolic conditioning enhances human bmMSC cell therapy of doxorubicin-induced heart failure

ABSTRACT: The therapeutic potential of bone marrow mesenchymal stromal cells (bmMSCs) in addressing heart failure need improvement for a better engraftment and survival. This study explores the role of metabolic sorting for human bmMSC on coculture in vitro and on doxorubicin-induced heart failure mice models. Using functional, epigenetic and gene expression approaches on cells sorted on the mitochondrial membrane potential referring their metabolic status, we demonstrated that bmMSC selected for their glycolytic metabolism presented proliferative advantage and resistance to oxidative stress favoring cell engraftment. Therapeutic use of glycolytic bmMSC rescued left ventricular ejection fraction and decrease fibrosis in mice model of acute heart failure. Metabolic changes were also related to epigenetic histone modifications as lysine methylation. Targeting LSD1 (lysine-specific demethylase 1) as a conditioning agent for enhancing the metabolic profile of bmMSC, we decipher the interplay between glycolysis and cell functionality. Our study leads to elucidate novel strategies for optimizing bmMSC-based therapies in treating heart failure and highlight the metabolic properties of bmMSCs as a promising target for more effective cardiovascular regenerative therapies.

ORGANISM(S): Homo sapiens

PROVIDER: GSE251709 | GEO | 2024/07/31

REPOSITORIES: GEO

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Project description:Background: Heart failure involves metabolic alterations including increased glycolysis despite unchanged or decreased glucose oxidation. The mitochondrial pyruvate carrier (MPC) regulates pyruvate entry into the mitochondrial matrix, and cardiac deletion of the MPC in mice causes heart failure. How MPC deletion results in heart failure is unknown. Methods: We performed targeted metabolomics and isotope tracing in wildtype (fl/fl) and cardiac-specific Mpc2-/- (CS-Mpc2-/-) hearts after in vivo injection of 13C-glucose. Cardiac glycogen was measured biochemically and by transmission electron microscopy. Cardiac glucose uptake of 2-deoxyglucose was measured and western blotting performed to analyze insulin signaling and enzymatic regulators of glycogen synthesis and degradation. Isotope tracing and glycogen analysis was also performed in hearts from mice fed either low-fat diet or a ketogenic diet previously shown to reverse the heart failure in CS-Mpc2-/- mice. Cardiac glycogen was also assessed in mice infused with angiotensin-II that were fed either low-fat or ketogenic diet. Results: Failing CS-Mpc2-/- hearts contained normal levels of ATP and phosphocreatine, suggesting their heart failure is not caused by energetic stress. These hearts displayed increased enrichment from 13C-glucose and increased glycolytic metabolite pool sizes. 13C enrichment and pool size was also increased for the glycogen intermediate UDP-glucose, as well as increased enrichment of the glycogen pool. Glycogen levels were increased ~6-fold in the failing CS-Mpc2-/- hearts, and glycogen granules were easily detected by electron microscopy. This increased glycogen synthesis occurred despite enhanced inhibitory phosphorylation of glycogen synthase and reduced expression of the priming enzyme glycogenin-1. In young, non-failing CS-Mpc2-/- hearts, increased glycolytic 13C enrichment occurred, but glycogen levels remained low and unchanged compared to fl/fl hearts. Feeding a ketogenic diet to CS-Mpc2-/- mice reversed the heart failure and normalized the cardiac glycogen and glycolytic metabolite accumulation. Cardiac glycogen levels were also elevated in mice infused with angiotensin II, and both the cardiac hypertrophy and glycogen levels were improved by ketogenic diet. Conclusions: Our results indicate that loss of MPC in the heart increases glycolytic metabolism and ultimately glycogen accumulation and heart failure, while a ketogenic diet can reverse both the glycogen accumulation and heart failure. We conclude that maintaining mitochondrial pyruvate import and metabolism is critical for the heart, unless cardiac pyruvate metabolism is dramatically reduced by consumption of a ketogenic diet.

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Metabolic conditioning enhances human bmMSC cell therapy of doxorubicin-induced heart failure

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