The effect of astragaloside IV on a model of isoproterenol-induced hypertrophic injury in H9c2 cells.

The objective of this study was to explore the protective effect of astragaloside IV on a model of isoproterenol-induced (ISO) hyper-trophic injury in rat cardiomyocytes H9c2 (cell line derived from embryonic BD1X rat heart tissue). A cell hypertrophy injury model was established (H9c2 cells treated with 100 μmol L-1 ISO). The cells were divided into normal control, a model group, and an astragalo-side IV group at several concentrations. Astragaloside IV was pre-administered for 2 hours, followed by ISO treatment for 24 hours. Cell viability, cell surface area, apoptosis rate, lactate dehydrogenase (LDH) activity, reactive oxygen species (ROS), superoxide dismutase (SOD), the mRNA levels of Bcl-2, Bax, p62, and LC3, the protein expressions of Sirt1, p62, caspase-3, beclin, and p53 and the LC3II/LC3I ratio were detected. Astragaloside IV significantly alleviated ISO-induced hypertrophy injury in H9c2 cells, reduced cell surface area and LDH release, decreased apoptosis rate and intracellular ROS levels, increased SOD levels, upregulated the expressions of autophagy-related mRNA and proteins, and downregulated the expressions of apoptosis-related mRNA and proteins. Astragaloside IV can effectively inhibit ISO-induced hypertrophy and apoptosis in H9c2 cells, and its mechanism may be related to promoting auto-phagy and reducing oxidative stress.