AIM To investigate the capability of salvianolic acid B(Sal B) to protect hepatocytes from hydrogen peroxide(H_2O_2)/carbon tetrachloride(CCl_4)-induced lysosomal membrane permeabilization. METHODS Cell Counting Kit-8 assay was used to measure cell viability. Apoptosis and death were assayed through flow cytometry. Brd U incorporation was used to detect cell proliferation. Serum alanine aminotransferase activity and liver malondialdehyde(MDA) content were measured. Liver histopathological changes were evaluated using hematoxylin-eosin staining. Lysosomal membrane permeability was detected with Lyso Tracker Green-labeled probes and acridine orange staining. The levels of protein carbonyl content(PCC), cathepsins(Cat)B/D, and lysosome-associated membrane protein 1(LAMP1) were evaluated through western blotting. Cytosol Cat B activity analysis was performed with chemiluminescence detection. The m RNA level ofLAMP1 was evaluated through quantitative real-time polymerase chain reaction. RESULTS Results indicated that H_2O_2 induced cell injury/death. Sal B attenuated H_2O_2-induced cell apoptosis and death, restored the inhibition of proliferation, decreased the amount of PCC, and stabilized the lysosome membrane by increasing the LAMP1 protein level and antagonizing Cat B/D leakage into the cytosol. CCl_4 also triggered hepatocyte death. Furthermore, Sal B effectively rescued hepatocytes by increasing LAMP1 expression and by reducing lysosomal enzyme translocation to the cytosol.CONCLUSION Sal B protected mouse embryonic hepatocytes from H_2O_2/CCl_4-induced injury/death by stabilizing the lysosomal membrane. AIM To investigate the capability of salvianolic acid B (Sal B) to protect hepatocytes from hydrogen peroxide (H 2 O 2) / carbon tetrachloride (CCl 4) -induced lysosomal membrane permeabilization. METHODS Cell Counting Kit-8 assay was used to measure cell viability. Apoptosis and Liver histopathological changes were used as hematoxylin-eosin staining. Lysosomal membrane permeability was detected with Lyso Tracker The levels of protein carbonyl content (PCC), cathepsins (Cat) B / D, and lysosome-associated membrane protein 1 (LAMP1) were evaluated by western blotting. Cytosol Cat B activity analysis was performed with chemiluminescence detection. The m RNA level of LAMP1 was evaluated through quantitative real-time polymerase chain reaction. RES ULTS Results indicated that H_2O_2 induced cell injury / death. Sal B attenuated H_2O_2-induced cell apoptosis and death, restored the inhibition of proliferation, decreased the amount of PCC, and stabilized the lysosome membrane by increasing the LAMP1 protein level and antagonizing Cat B / Sal B effectively rescued hepatocytes by increasing LAMP1 expression and by reducing lysosomal enzyme translocation to the cytosol.CONCLUSION Sal B protected mouse embryonic hepatocytes from H_2O_2 / CCl_4-induced injury / death by stabilizing the lysosomal membrane.