ABSTRACT
Objective: To study the protective effects and the mechanism of Salvia yunnanensis extract on hypoxia/reoxygenation injury in cultured rat H9c2 cardiomyocytes.Methods: The hypoxia/reoxygen (H/R) injury model was established in H9c2 cell strain with or without the extract of Salvia yunnanensis.The cultured H9c2 cardiomyocytes were randomly divided into 6 groups: the normal control (C) group, H/R group, H/R+verapamil (H/R+V) group, H/R+Salvia yunnanensis extract at low dose (H/R+L, 0.01 mg·L-1) group, medium dose (H/R+M, 0.1 mg·L-1) group and high dose (H/R+H, 1.0 mg·L-1) group.The cell viability was measured by MTT assay and the activity of malondialdehyde (MDA) and lactate dehydrogenase (LDH) was measured by a detection kit.Fluorescence absorbance (A) value was measured by a fluoroscopy to show the intracellular reactive oxygen species (ROS) levels.Results: Compared with that in the model group, the survival rate of myocardial cells was significantly higher in Salvia yunnanensis extract at low, medium and high dose groups (P＜0.05 or P＜0.01), and the intracellular LDH leakage (P＜0.05 or P＜0.01), the content of MDA in cytoplasm (P＜0.01) and the intracellular ROS levels significantly decreased in Salvia yunnanensis extract at high dose group (P＜0.05).Conclusion: The extract of Salvia yunnanensis has protective effect on hypoxia/reoxygenation injury in cultured rat H9c2 cardiomyocytes, and the mechanism may be related to the reduction of lipid peroxides and removal of cell oxygen free radicals.