氧化苦参碱对人胃癌细胞杀伤作用的机制

Oxymatrine induces the expression of transmembrane protein claudin-1 in the intestinal mucosa of rats with severe acute pancreatitis

AIM: To investigate the effect of oxymatrine (OM) on intestinal mucosal barrier dysfunction in rats with severe acute pancreatitis (SAP) and to analyze possible mechanisms involved.

METHODS: A rat model of SAP was established by peritoneal injection of 175 mg/100 g L-arginine. Eighty healthy male Wistar rats were divided randomly into four groups: control group, OM control group, SAP control group, OM treatment group (1-, 12-, 24-, 36-, and 48-h subgroups). After treatment, plasma endotoxin and D-lactic acid levels were determined, the expression of claudin-1 mRNA in the tunica mucosa coli was detected by real-time polymerase chain reaction (real time-PCR), and the activity of claudin-1 was determined by Western blotting.

RESULTS: There were no significant differences in plasma levels of endotoxin and D-lactic acid and expression levels of claudin-1 mRNA and protein in the tunica mucosa coli between the control group and OM control group. Compared with the control group, plasma endotoxin and D-lactic acid levels were markedly increased, and the expression levels of claudin-1 mRNA and protein in the tunica mucosa coli were significantly decreased in the SAP control group (0.61 EU/mL ± 0.01 EU/mL vs 0.05 EU/mL ± 0.02 EU/mL; 8.38 mg/L ± 0.38 mg/L vs 2.87 mg/L ± 0.50 mg/L, both P < 0.01). Compared with the SAP control group, the expression levels of claudin-1 mRNA and protein in the tunica mucosa coli were significantly increased and plasma levels of endotoxin and D-lactic acid were markedly decreased in the OM treatment group (0.09 EU/mL ± 0.02 EU/mL vs 0.61 EU/mL ± 0.01 EU/mL; 2.94 mg/L ± 0.42 mg/L vs 8.38 mg/L ± 0.38 mg/L, both P < 0.01).

CONCLUSION: Plasma levels of endotoxin and D-lactic acid were markedly increased and expression levels of claudin-1 mRNA and protein in tunica mucosa coli were significantly decreased in SAP rats. OM intervention can markedly decrease plasma levels of endotoxin and D-lactic acid, increase claudin-1 mRNA and protein expression levels, and improve mucosal barrier dysfunction to prevent bacterial translocation in SAP rats.

Comparison of the antiviral effect between matrine and oxymatrine against hepatic B virus in vitro

AIM: To evaluate the effect of matrine and oxymatrine on secreting HBsAg, HBeAg and Pre-S1 in HepG2.2.15 cells.

METHODS: HepG2.2.15 cell lines were cultured in vitro at different concentrations of matrine and oxymatrine. Nine days later, inhibitory effects of the experimental drugs on HepG2.2.15 cell lines were estimated using MTT and serum HBsAg, HBeAg and Pre-S1 were detected using ELISA.

RESULTS: The inhibitory effects of matrine and oxymatrine on HepG2.2.15 cells under the concentration of 0.001 mol/L was lower (<25%). When concentration was between 1000 μmol/L and 0.1 μmol/L, the inhibition ratios for either matrine or oxymatrine were more than 50% for secreting HBsAg, but lower than 50% for HBeAg. At the concentration of 0.001 mol/L, the inhibitory rates of matrine and oxymatrine on Pre-S1 were 53.58%, and 59.33%, respectively.

CONCLUSION: Both Matrine and Oxymatrine have effect of anti-HBV in vitro in some degrees, and no significant difference is noted. Their inhibitory effects on HBsAg and Pre-S1 are superior to Lamivudine.