Abstract: Objective  To investigate the effects of Astragaloside IV (ASIV) on myocardial myocardiopathy and peroxisomal proliferate activation receptor α (PPARα) in mice induced by lipopolysaccharide (LPS).　Methods　50 healthy male C57BL/6J mice were randomly divided into 5 groups, each group of 10 mice, which were divided into a blank control group, a lipopolysaccharide model group and three astragaloside IV (20, 40, 80 mg/kg/d) groups. Astragaloside IV was administered to the ASIV groups for 7 days, and then the model group was given LPS (10 mg/kg) to establish an acute endotoxin damage model. After 8 h, ultrasound was used to observe the mouse heart function index: ejection fraction (EF), shortening fraction (FS), left ventricular diastolic inner diameter (LVIDd), and left ventricular end-systolic diameter (LVIDs); HE staining was used to observe the morphological changes of the heart tissue of mice; Enzyme linked immunosorbent assay (ELISA) was used to detect tumor necrosis factor (TNF-α), interleukin-1β (IL-1β), interleukin-6 (IL-6), and free fatty acid (FFA); High performance liquid chromatography (HPLC) was used to detect the content of adenosine triphosphate (ATP), adenosine diphosphate(ADP) and adenosine monophosphate (AMP); Western Blot was used to detect the protein expression levels of PPARα and ATP5D in myocardial tissues. 　Results　Compared with the model group, the increasing of the cardiac function index EF, FS, LVIDd and LVIDs of the ASIV groups improved the infiltration of inflammatory cells and the deformation of myocardial fibers, decreased the content of TNF-α, IL-1β, IL-6, FFA, and increased the ratio of ATP/AMP and ADP/AMP ; increased the protein expressions of PPARα and ATP5D.　Conclusions　Astragaloside IV may be used to improve the energy metabolism of myocardial injury induced by lipopolysaccharide by PPARα, which can protect the cardiomyopathy of sepsis.

Key words:  , Astragaloside IV, 　Lipopolysaccharide, 　Sepsis cardiomyopathy, 　PPARα, 　Energy metabolism