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Objective To investigate the protective effects of Bauhinia championii Benth flavones(BCF) on oxidative stress of neonatal rat cadiocytes induced by H2O2.Methods Cadiocytes of neonate rat was cultivated for 72 hours and divided into six groups: a normal control group, a H2O2 group, BCF(60, 120 and 240μg/ml)+H2O2 groups and aShuxueninginjection (100μg/ml)+H2O2 group (n=8). 6 hours after the drugs were given, the morphology changes was observed and the survival rate was detected; the content of AST, CPK, LDH in culture medium were detected; the activity of SOD, CAT, GSH-Px and the content of MDA in cardiomyocytes were also determinted; the apoptosis rate were detected, and the expression of caspase-3 in cardiomyocytes was detected by Western blot.Results Compared with the H2O2 group, the activity of AST(28.8 ± 6.1 U/ml, 24.5 ± 5.3 U/mlvs. 36.2 ± 6.7 U/ml), CPK(1.8 ± 0.4 U/ml, 1.5 ± 0.3 U/mlvs. 2.5 ±0.4 U/ml), LDH(805.2 ± 160.9 U/L, 671.5 ± 128.7 U/Lvs. 916.5 ± 168.4 U/L) in culture medium were significantly decreased (P<0.05,P<0.01), the activity of SOD(84.8 ± 17.4 U/mg, 95.3 ± 18.2 U/mgvs. 55.7 ± 13.1 U/mg), CAT(23.4 ± 3.1 U/mg, 26.3 ± 3.5U/mgvs. 15.2 ± 3.0 U/mg) in cardiomyocytes were significantly increased and the content of MDA(8.1 ± 1.7 nmol/mg, 6.8 ± 1.5 nmol/mgvs. 11.1 ± 2.3 nmol/mg) were significantly decreased (P<0.05,P<0.01), the expression of c caspase-3(1.64 ± 0.16, 1.30 ± 0.12vs. 2.06 ± 0.25) and the apoptosis rate (24.2% ± 5.5%, 13.4% ± 3.9%vs. 51.2% ± 9.1%) were significantly decreased (P<0.05,P<0.01); the activity of GSH-Px (3.6 ± 0.9 U/mg vs. 2.4 ± 0.7 U/mg) in cardiomyocytes of BCF 240μg/ml treatment group was increased (P<0.05).Conclusions BCF could effectively improve the morphology of neonatal rat cadiocytes induced by H2O2, increase the survival rate, improve the activity of antioxidase, down-regulate the expression of caspase-3 and decrease the apoptosis rate, suggesting that BCF had dose-dependent protective effects on oxidative stress of neonatal rat cadiocytes induced by H2O2.
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Aim To study the effects of Bauhinia championii flavones ( BCF ) on adjusting autophagy a-gainst myocardial ischemia reperfusion injury. Meth-ods 120 SD rats were randomly divided into control, model, 3-MA (15 mg·kg-1 ) and BCF (10, 20 mg ·kg-1) groups (n=8). 30min. ischemia, ischemia/reperfusion 1h. or 3h, while myocardial ischemia reperfusion model was established by ligating left ante-rior descending coronary artery. The contents of crea-tine kinase-MB ( CK-MB) , inducible nitric oxide syn-thase ( iNOS ) and total antioxidative capacity ( T-AOC ) in serum were determined according to the ultra-violet spectrophotometer colorimetric method. The pro-tein expression of LC3-Ⅱ, Beclin-1 and mTOR was observed by Western blot. Results Compared with model group, BCF dose-dependently improved T-AOC, decreased CK-MB and iNOS ( P < 0. 05 ) . Meanwhile, BCF down-regulated the protein expression of LC3-Ⅱand Beclin-1 , and up-regulated mTOR pro-tein expression ( P < 0. 05 ) . Compared with 3-MA group, BCF reduced the contents of CK-MB and iN-OS, increased the level of T-AOC. It raised LC3-Ⅱand Beclin-1 protein expression at 30min. of ischemia, and then declined the protein expression of LC3-Ⅱand Beclin-1 . BCF descended the protein expression of mTOR all over the time ( P <0. 05 ) . Conclusion Autophagy occurs in ischemia then improves in ische-mia/reperfusion period. BCF could promote the occur-ring of autophagy at 30min. of ischemia in the short term and inhibit the excessive expression of autophagy with the increase of time in reperfusion period. BCF pretreatment reduce myocardial ischemia/reperfusion injury may by promoting the occurrence of autophagy during ischemia period and inhibit them in reperfusion.