Objective To study the effect of Pingl? Formula (PL) on the arrhythmia of myocardial ischemia-reperfusion in rats.Methods Rat arrhythmia models were established by occlusion of the LAD coronary artery for 15 min and thereafter reperfusion for 45 min.At the same time,the changes were observed on lead Ⅱ dynamic ECG.The activities of Ca~(2+)-ATPase,Mg~(2+)-ATPase,and Na~+,K~+-ATPase were determined, respectively.The levels of ATP,total adenine nucleotides(TAN),and energy charge(EC) of the myocardial organized energy state were analyzed by RP-HPLC.Results PL(ig 0.04,0.20,and 1.00 g/kg) showed to decrease the incidence of arrhythmia induced by ischemia-reperfusion,shorten the duration of ventricular arrhythmia and eliminate the incidence of ventricular fibrillation.The activities of Ca~(2+)-ATPase,Mg~(2+)-ATPase,and Na~+,K~+-ATPase were increased by PL.In the PL(0.04,0.20,and 1.00 g/kg) groups,ATP levels recovered to 58%,68%,and 86% as compared with normal group,simul-taneously,TAN values were enhanced to 25%,49%,and 66% and EC values to 24%,27%,and 29%, respectively.Conclusion PL has obvious antiarrhythmic effect on rat,the protective action is related to the improvement of energy metabolism.

Objective:To build mice ulcerative colitis(UC)model by dextran sodium sulfate salt(DSS),and to explore effect and molecular mechanism of oridonin(Ori)on alleviating UC by mediating Sirt1 signaling pathway,as well as to find new drugs for UC treatment.Methods:Sixty BALB/c mice were randomly divided into normal group(NC),model group(DSS),DSS+mesalazine sustained-release granule group(AC),DSS+low-dose Ori group(Ori-L),DSS+medium-dose Ori group(Ori-M)and DSS+high-dose Ori group(Ori-H),with 10 mice in each group.Except NC group,mice in other groups were given 3%DSS aqueous solution free for 7 days.After successful modeling,Ori-L group,Ori-M group and Ori-H group were intragastric with 50,100 and 150 mg/kg Ori suspension,respectively.NC group and DSS group drank distilled water free,AC group was intragastric with mesalazine sustained-release granules 100 mg/kg,lasted for 10 days.Weight changes of mice were recorded and disease active index(DAI)score was performed.After treatment,serum levels of IL-1β and tumor necrosis factor-α(TNF-α)were detected by ELISA.Whole colon tissues were extracted,length was measured,and HE staining was performed.Real-time fluorescence quantitative PCR and Western blot were used to detect expressions of Sirt1,NF-κB and p53 in colon tissues of each group.Results:After successful modeling,compared with NC group,the other 5 groups of mice showed weight loss,DAI score increased and colon length shortened,Sirt1 expression was signi-ficantly inhibited,while expressions of NF-κB and p53 were significantly increased,accompanied by obvious inflammatory pathologi-cal features.Compared with DSS group,Ori-L,Ori-M,and Ori-H groups and AC group had less weight loss during experiment,and DAI scores showed lower disease activity and relatively less colon length shortening,Sirt1 expression was less inhibited,expressions of NF-κB and p53 were also relatively small.Results of AC group could prove that Ori has therapeutic effect on UC.Conclusion:Ori can improve UC in mice,whose effect may be related to regulation of Sirt1 signal.