白藜芦醇对酒精诱导的HepG2细胞氧化损伤的保护作用及相关基因表达的变化

Separation and Identification of Resveratrol Butyrate Ester Complexes and Their Bioactivity in HepG2 Cell Models

Resveratrol butyrate ester (RBE) complexes have demonstrated higher antioxidant capacity and anti-fat accumulation activity in previous studies. In this study, silica gel, high-performance liquid chromatography, and 1H nuclear magnetic resonance were used for separation and identification of RBE complex components. With the exception of resveratrol, five different structures of ester derivatives were separated from silica gel: 3,4′-di-O-butanoylresveratrol (ED2, 18.8%), 3-O-butanoylresveratrol (ED4, 35.7%), 4′-O-butanoylresveratrol (ED5, 4.4%), 3,5,4′-tri-O-butanoylresveratrol (ED6, 1.5%), and 3,5-di-O-butanoylresveratrol (ED7, 0.7%). Among the ester derivatives obtained, ED2 and ED4 were the main ester derivatives in the RBE complex. Thus, the cellular antioxidant activities of the RBE mixture, ED2, and ED4 were evaluated. Results showed that the antioxidant capacity of ED2 and ED4 was higher than that of the RBE mixture, demonstrating that the number and position of butyrate esterification sites are related to cell survival rate and antioxidant capacity. This study is the first to report the successful isolation, structural identification, and cellular biological antioxidant activity of RBE complex derivatives, which are key characteristics for the potential practical application of RBE complexes.

Protective effects of resveratrol against alcohol-induced oxidative stress and apoptosis in human SH-SY5Y cells

AIM: To assess the effects of resveratrol as an antioxidant against alcohol-induced oxidative stress and apoptosis in SH-SY5Y cells and explore the underlying mechanisms.

METHODS: SH-SY5Y cells were pretreated with resveratrol for 24 h before treatment with alcohol to induce oxidative stress and apoptosis. MTT assay was then performed to detect the viability of SH-SY5Y cells in both resveratrol-treated and control groups. ELISA was performed to detect the presence of superoxide dismutase (SOD) and the level of total intracellular reactive oxygen species (ROS). Flow cytometry was used to detect cell apoptosis. RT-PCR was performed to detect the expression levels of SOD₁, SOD₂, catalase, PARP and Caspase 3, which are key genes involved in anti-oxidation and apoptosis pathways.

RESULTS: MTT assay showed that in comparison with control cells (non-treated with resveratrol), toxicity of resveratrol (25, 50, 100 μmol/L) towards SH-SY5Y cells was below 20%. Treatment with 300 mmol/L alcohol without pre-treatment with resveratrol resulted in death of around 57% cells. Resveratrol at concentrations from 25-100 μmol/L played an antagonistic role against cytotoxicity of 300 mmol/L alcohol to SH-SY5Ycells. ELISA results showed that SOD activity was significantly higher in cells treated with 100 μmol/L resveratrol (0.559 ± 0.021) than in non-treated cells (0.296 ± 0.023). After alcohol induction, non-resveratrol-treated cells showed a higher ROS level (16163.89 ± 624.67) compared to cells treated with 25, 50, and 100 μmol/L resveratrol (29302.79.26 ± 1208.38; 25528.34 ± 1126.63; 20219.78 ± 1622.35). Flow cytometry showed that the percentage of apoptotic cells in alcohol treated cells were higher than those in other groups. RT-PCR results showed that compared to cells treated with 300 mmol/L alcohol, resveratrol increased the expression of SOD₁ (0.623 ± 0.033; 0.686 ± 0.022; 0.853 ± 0.014), SOD₂ (1.19 ± 0.123; 0,928 ± 0.0121; 1.09 ± 0.0101), catalase (1.828 ± 0.067; 2.018 ± 0.079; 2.196 ± 0.081), PARP (2.828 ± 0.161; 3.018 ± 0.208; 4.196 ± 0.190) and Caspase3 (5.828 ± 0.367; 5.318 ± 0.279; 4.196 ± 0.200).

CONCLUSION: Our findings show the neuroprotective of resveratrol against alcohol-induced oxidative stress and apoptosis in SH-SY5Y cells.