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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: BACKGROUND, RESULTS. Meshes: Animals, Astragalus propinquus, Cardiotonic Agents, Cell Line, Diabetic Cardiomyopathies, Dietary Supplements, Energy Metabolism, Fenofibrate, Gene Expression Regulation, Heart, Hypoglycemic Agents, Hypolipidemic Agents, Lipid Metabolism, Male, Mice, Inbred C57BL, Mice, Transgenic, Myocardium, Myosin Heavy Chains, PPAR alpha, Plant Roots, Polysaccharides, Recombinant Fusion Proteins.
user
Do astragalus polysaccharides repress myocardial lipotoxicity in a PPARalpha-dependent manner in vitro and in vivo in mice? Context: The role of peroxisome proliferator-activated receptor alpha (PPARα) in the development of myocardial lipotoxicity is widely observed in diabetic disorders. Thus, we investigated if treatment of Astragalus polysaccharides modulates lipotoxic cardiomyopathy both in vivo and in vitro through PPARα mechanisms. The effects of Astragalus polysaccharides (APS) on PPARα target gene expression and protein levels were tested in vitro and in vivo, including in mice with PPARα cardiac-restricted overexpression [myosin heavy chain (MHC)-PPARα] and in H9c2 embryonic rat cardiomyocytes with or without PPARα agonist. Echocardiographic studies, analyses of myocardial triglyceride and cardiac fuel utilization analyses were also performed in MHC-PPARα mice. Treatment with APS prevented myocardial triglyceride accumulation and cardiac dysfunction in the MHC-PPARα mice, with the normalization of energy metabolic derangements in hearts including reduced free fatty acids utilization and increased glucose uptake. Consistently, both in the MHC-PPARα hearts and H9c2 cardiomyocytes with PPARα agonist, the activation of PPARα gene regulatory pathway involved in FFA-oxidation was down-regulated by APS treatment, while the suppression of PPARα target genes involved in glucose uptake and oxidation was normalized by APS administration.
assistant
Therapy with APS could prevent the development of lipotoxic cardiomyopathy through a mechanism mainly dependent on the cardiac PPARα-mediated regulatory pathways. Final Decision: yes