AIM: To study the influence of inducers of drug metabolism enzyme, beta-naphthoflavone (BNF) and dexamethasone (DEX), on the stereoselective metabolism of propafenone in the rat hepatic microsomes. METHODS: Phase I me...AIM: To study the influence of inducers of drug metabolism enzyme, beta-naphthoflavone (BNF) and dexamethasone (DEX), on the stereoselective metabolism of propafenone in the rat hepatic microsomes. METHODS: Phase I metabolism of propafenone was studied using the microsomes induced by BNF and DEX and the non-induced microsome was used as the control. The enzymatic kinetics parameters of propafenone enantiomers were calculated by regress analysis of Eadie-Hofstee Plots. Propafenone enantiomer concentrations were assayed by a chiral HPLC. RESULTS: The metabolite of propafenone, N-desalkylpropafenone, was found after incubation of propafenone with the rat hepatic microsomes induced by BNF and DEX. In these two groups, the stereoselectivity favoring R(-) isomer was observed in metabolism at low substrate concentrations of racemic propafenone, but lost the stereoselectivity at high substrate concentrations. However, in control group, no stereoselectivity was observed. The enzyme kinetic parameters were: (1) K(m). Control group: R(-) 83+/-6, S(+) 94+/-7; BNF group: R(-) 105+/-6, S(+)128+/-14; DEX group: R(-) 86+/-11, S(+) 118+/-16; (2)V(max). Control group: R(-) 0.75+/-0.16, S(+) 0.72+/-0.07; BNF group: R(-) 1.04+/-0.15, S(+)1.07+/-14; DEX group: R(-) 0.93+/-0.06, S(+) 1.04+/-0.09; (3)Cl(int). Control group: R(-) 8.9+/-1.1, S(+) 7.6+/-0.7; BNF group: R(-) 9.9+/-0.9, S(+)8.3+/-0.7; DEX group: R(-) 10.9+/-0.8, S(+) 8.9+/-0.9. The enantiomeric differences in K(m) and Cl(int) were both significant, but not in V(max), in BNF and DEX group. Whereas enantiomeric differences in three parameters were all insignificant in control group. Furthermore, K(m) and V(max) were both significantly less than those in BNF or DEX group. In the rat liver microsome induced by DEX, nimodipine (NDP) decreased the stereoselectivity in propafenone metabolism at low substrate concentration. The inhibition of NDP on the metabolism of propafenone was stereoselective with R(-)-isomer being impaired more than S(+)-isomer. The inhibition constant (Ki) of S(+)- and R(-)-propafenone, calculated from Dixon plots, was 15.4 and 8.6 mg x L(-1), respectively. CONCLUSION: CYP1A subfamily(induced by BNF) and CYP3A4 (induced by DEX) have pronounced contribution to propafenone N-desalkylation which exhibited stereoselectivity depending on substrate concentration. The molecular base for this phenomenon is the stereoselectivity in affinity of substrate to the enzyme activity centers instead of at the catalyzing sites.展开更多
The enantioselective assay for S(+)- and R(-)-propafenone (PPF) in human urine that developed in this work involves extraction of propafenone from human urine and using S(+)-propafenone as internal standard, chiral de...The enantioselective assay for S(+)- and R(-)-propafenone (PPF) in human urine that developed in this work involves extraction of propafenone from human urine and using S(+)-propafenone as internal standard, chiral derivatization with 2,3,4,6-tetra-O-b-D-glucopranosyl isothiocyanate, and quantitation by an RP-HPLC system with UV detection (l=220 nm). A baseline separation of propafenone enantiomers was achieved on a 5-mm reverse phase ODS column, with a mixture of methanol:water:glacial acetic acid (25:12:0.02,v/v) as mobile phase. There was good linear relationship from 24.9 ng/ml to 1875.0 ng/ml for both of enantiomers. The regression equations of the standard curves based on CS-PPF (or CR-PPF ) versus ratio of AS-PPF/AS (or AR-PPF/AS ) were y=0.0032x-0.081, (r=0.999) for S-PPF and y=0.0033x+0.0039, (r=0.998) for R-PPF, respectively. The method抯 limit of detection was 12.5 ng/ml for both enantiomers, and the method抯 limit of quantitation was 28.20.52 ng/ml for S-PPF, 30.40.53 ng/ml for R-PPF (RSD<8%, n=5). The analytical method yielded average recovery of 98.9% and 100.4% for S-PPF and R-PPF, respectively. The relative standard deviation was no more than 6.11% and 6.22% for S-PPF and R-PPF, respectively. The method enabled study of metabolism of S(+)- and R(-)-propafenone in human urine. The results from 7 volunteers administered 150 mg racemic propafenone indicated that propafenone enantiomers undergo stereoselective metabolism and that in the human body, S(+)-propafenone is metabolized more extensively than R(-)- propafenone.展开更多
Objective： To determine the selective killing effect of oxytetracycline, propafenone and metamizole on A549 or Hela cells. Methods： Proliferation assay, lactate dehydrogenase （LDH） assay, apoptosis detecting, flow...Objective： To determine the selective killing effect of oxytetracycline, propafenone and metamizole on A549 or Hela cells. Methods： Proliferation assay, lactate dehydrogenase （LDH） assay, apoptosis detecting, flow cytometry and western blot were performed. Results： It was found that treatment with propafenone at the concentration of 0.014 g/L or higher for 48 h could induce apoptosis in Hela cells greatly, while it was not observed in oxytetracycline and metamizole at the concentration of 0.20 g/L for 48 h. Oxytetracycline, propafenone and metamizole all displayed evident inhibitory effects on the proliferation of A549 cells. The results of LDH assay demonstrated that the drugs at the test range of concentration did not cause necrosis in the cells. Propafenone could elevate the protein level of P53 effectively （P〈0.01）. Conclusions： Oxytetracycline, propafenone and metamizol （dipyrone） all displayed evident inhibitory effects on the proliferation of A549 cells. Propafenone also displayed evident inhibitory effects on the proliferation of Hela cells.展开更多
The electrophysiological effects of 5.8×10<sup>-6</sup> mol/L propafenonewere studied in neonatal canine Purkinje fiber compared with changes in theadult canine. The method used was microelectrode tec...The electrophysiological effects of 5.8×10<sup>-6</sup> mol/L propafenonewere studied in neonatal canine Purkinje fiber compared with changes in theadult canine. The method used was microelectrode technique. This study sug-gests that Purkinje fibers are less sensitive to propafenone in the neonate than inthe adult, but at shorter ample lengths, the difference between them is not sig-nificant.展开更多
This study was to determine whether isoproterenol (Iso) reverses the effects of propafenone(Pro) on the induction of supraventricular tarhycardia and whether the revergal during electrophysiologicstudy (EPS) is predic...This study was to determine whether isoproterenol (Iso) reverses the effects of propafenone(Pro) on the induction of supraventricular tarhycardia and whether the revergal during electrophysiologicstudy (EPS) is predictive of clinical recurrences of SVT during long-term treatment with Pro.Thirtypatients with inducible sustained SVT at baseline state were studied. Iso infusion at a rate necessary toachieve a 20%-40% increase in heart rate completely (16/28 cases,57%) or partially (5/28 case, 18%)revereed Pro's suppressant effects on the induction of SVT.There were clinical recurrcnces of SVT in fiveof 16 patients (31%) treated on a long-term basis (mean 4.5±3.6 months) with Pro,Iso completelyreveroed Pro's supprosant effect on the induction of SVT in four of these five patients (80%).These fivepatients then were treated with Pro and metoprolol and no further clincal recnrrences of SVT.These resultssuggested that reveroal by Iso ofpro's suppresaant effects on the induction of SVT may identify patients whoare likely to experience clinical recurrence of SVT and these patients may benefit from treatment with aB-blocker during longterm therapy with Pro.展开更多
Objectives To observe the electrophysiologic effects of propafenone （Prop） on ischemic ventricular tachyarrhythmias. Methods A canine ischemic ventricular tachyarrhythmia model was established in open-chest dogs sub...Objectives To observe the electrophysiologic effects of propafenone （Prop） on ischemic ventricular tachyarrhythmias. Methods A canine ischemic ventricular tachyarrhythmia model was established in open-chest dogs subjected to programmed electrical stimulation （PES） on 5-8 days after acute myocardial infarction. The electrophysiologic effects of propafenone were observed in the model. Results Propafenone distinctly lengthened the QTc interval （P 〉 0.01） and effective refractory period （ERP） of normal and ischemic ventricular myocardium （NERP and IERP） respectively （P 〉 0.01）, decreased the dispersion of ERP in ischemic myocardium and in left ventricle （P 〉 0.01）, and increased the diastolic excitability threshold of normal and ischemic ventricular myoeardium remarkably （P 〉 0.01）. Propafenone effectively prevented PES-induced ventricular tachycardia （VT） or ventricular fibrillation （VF） （P 〉 0.01） and ischemia-induced VT/VF （P 〉 0.05）. Conclusions The results indicated that the canine model produced by our methods is a worthy and reliable one, propafenone may be effective in preventing the onset of VT / VF after myocardial ischemic damage in dogs, and deserve further attention as an antifibrillatory agent.展开更多
Many reviewers have contributed their expertise and time to the peer review, a critical process to ensure the quality of World Journal of Gastrointestinal
We acknowledge our sincere thanks to our reviewers. Many reviewers have contributed their expertise and time to the peer review, a critical process to ensure the quality of our World Series Journals. Both the editors ...We acknowledge our sincere thanks to our reviewers. Many reviewers have contributed their expertise and time to the peer review, a critical process to ensure the quality of our World Series Journals. Both the editors of the journals and authors of the manuscripts submitted to the journals are grateful to the following reviewers展开更多
Many reviewers have contributed their expertise and time to the peer review,a critical process to ensure the quality of World Journal of Gastrointestinal
We acknowledge our sincere thanks to our reviewers.Many reviewers have contributed their expertise and time to the peer review,a critical process to ensure the quality of our World Series Journals.Both the editors of ...We acknowledge our sincere thanks to our reviewers.Many reviewers have contributed their expertise and time to the peer review,a critical process to ensure the quality of our World Series Journals.Both the editors of the journals and authors of the manuscripts submitted to the journals are grateful to the following reviewers for reviewing the articles(either published or rejected) over the past period of time.展开更多
Many reviewers have contributed their expertise and time to the peer review, a critical process to ensure the quality of World Journal of Gastrointestinal Pharmacology and Therapeutics. The editors
基金Supported by the National Natural Science Foundation of China(No.39370805,N039770868)Zhejiang Natural Science Foundation(No.RC97016)of Zhejiang Province
文摘AIM: To study the influence of inducers of drug metabolism enzyme, beta-naphthoflavone (BNF) and dexamethasone (DEX), on the stereoselective metabolism of propafenone in the rat hepatic microsomes. METHODS: Phase I metabolism of propafenone was studied using the microsomes induced by BNF and DEX and the non-induced microsome was used as the control. The enzymatic kinetics parameters of propafenone enantiomers were calculated by regress analysis of Eadie-Hofstee Plots. Propafenone enantiomer concentrations were assayed by a chiral HPLC. RESULTS: The metabolite of propafenone, N-desalkylpropafenone, was found after incubation of propafenone with the rat hepatic microsomes induced by BNF and DEX. In these two groups, the stereoselectivity favoring R(-) isomer was observed in metabolism at low substrate concentrations of racemic propafenone, but lost the stereoselectivity at high substrate concentrations. However, in control group, no stereoselectivity was observed. The enzyme kinetic parameters were: (1) K(m). Control group: R(-) 83+/-6, S(+) 94+/-7; BNF group: R(-) 105+/-6, S(+)128+/-14; DEX group: R(-) 86+/-11, S(+) 118+/-16; (2)V(max). Control group: R(-) 0.75+/-0.16, S(+) 0.72+/-0.07; BNF group: R(-) 1.04+/-0.15, S(+)1.07+/-14; DEX group: R(-) 0.93+/-0.06, S(+) 1.04+/-0.09; (3)Cl(int). Control group: R(-) 8.9+/-1.1, S(+) 7.6+/-0.7; BNF group: R(-) 9.9+/-0.9, S(+)8.3+/-0.7; DEX group: R(-) 10.9+/-0.8, S(+) 8.9+/-0.9. The enantiomeric differences in K(m) and Cl(int) were both significant, but not in V(max), in BNF and DEX group. Whereas enantiomeric differences in three parameters were all insignificant in control group. Furthermore, K(m) and V(max) were both significantly less than those in BNF or DEX group. In the rat liver microsome induced by DEX, nimodipine (NDP) decreased the stereoselectivity in propafenone metabolism at low substrate concentration. The inhibition of NDP on the metabolism of propafenone was stereoselective with R(-)-isomer being impaired more than S(+)-isomer. The inhibition constant (Ki) of S(+)- and R(-)-propafenone, calculated from Dixon plots, was 15.4 and 8.6 mg x L(-1), respectively. CONCLUSION: CYP1A subfamily(induced by BNF) and CYP3A4 (induced by DEX) have pronounced contribution to propafenone N-desalkylation which exhibited stereoselectivity depending on substrate concentration. The molecular base for this phenomenon is the stereoselectivity in affinity of substrate to the enzyme activity centers instead of at the catalyzing sites.
基金Project supported by the National Natural Science Foundation of China (No. 30225047) and by SRF for ROCS+2 种基金 SEM and Zhejiang Provincial Natural Science Foundation (No. RC97016) China
文摘The enantioselective assay for S(+)- and R(-)-propafenone (PPF) in human urine that developed in this work involves extraction of propafenone from human urine and using S(+)-propafenone as internal standard, chiral derivatization with 2,3,4,6-tetra-O-b-D-glucopranosyl isothiocyanate, and quantitation by an RP-HPLC system with UV detection (l=220 nm). A baseline separation of propafenone enantiomers was achieved on a 5-mm reverse phase ODS column, with a mixture of methanol:water:glacial acetic acid (25:12:0.02,v/v) as mobile phase. There was good linear relationship from 24.9 ng/ml to 1875.0 ng/ml for both of enantiomers. The regression equations of the standard curves based on CS-PPF (or CR-PPF ) versus ratio of AS-PPF/AS (or AR-PPF/AS ) were y=0.0032x-0.081, (r=0.999) for S-PPF and y=0.0033x+0.0039, (r=0.998) for R-PPF, respectively. The method抯 limit of detection was 12.5 ng/ml for both enantiomers, and the method抯 limit of quantitation was 28.20.52 ng/ml for S-PPF, 30.40.53 ng/ml for R-PPF (RSD<8%, n=5). The analytical method yielded average recovery of 98.9% and 100.4% for S-PPF and R-PPF, respectively. The relative standard deviation was no more than 6.11% and 6.22% for S-PPF and R-PPF, respectively. The method enabled study of metabolism of S(+)- and R(-)-propafenone in human urine. The results from 7 volunteers administered 150 mg racemic propafenone indicated that propafenone enantiomers undergo stereoselective metabolism and that in the human body, S(+)-propafenone is metabolized more extensively than R(-)- propafenone.
基金the technical platform in Shandong University and Doctor research fund of Hubei University of Art and Science(2013B009)
文摘Objective： To determine the selective killing effect of oxytetracycline, propafenone and metamizole on A549 or Hela cells. Methods： Proliferation assay, lactate dehydrogenase （LDH） assay, apoptosis detecting, flow cytometry and western blot were performed. Results： It was found that treatment with propafenone at the concentration of 0.014 g/L or higher for 48 h could induce apoptosis in Hela cells greatly, while it was not observed in oxytetracycline and metamizole at the concentration of 0.20 g/L for 48 h. Oxytetracycline, propafenone and metamizole all displayed evident inhibitory effects on the proliferation of A549 cells. The results of LDH assay demonstrated that the drugs at the test range of concentration did not cause necrosis in the cells. Propafenone could elevate the protein level of P53 effectively （P〈0.01）. Conclusions： Oxytetracycline, propafenone and metamizol （dipyrone） all displayed evident inhibitory effects on the proliferation of A549 cells. Propafenone also displayed evident inhibitory effects on the proliferation of Hela cells.
文摘The electrophysiological effects of 5.8×10<sup>-6</sup> mol/L propafenonewere studied in neonatal canine Purkinje fiber compared with changes in theadult canine. The method used was microelectrode technique. This study sug-gests that Purkinje fibers are less sensitive to propafenone in the neonate than inthe adult, but at shorter ample lengths, the difference between them is not sig-nificant.
文摘This study was to determine whether isoproterenol (Iso) reverses the effects of propafenone(Pro) on the induction of supraventricular tarhycardia and whether the revergal during electrophysiologicstudy (EPS) is predictive of clinical recurrences of SVT during long-term treatment with Pro.Thirtypatients with inducible sustained SVT at baseline state were studied. Iso infusion at a rate necessary toachieve a 20%-40% increase in heart rate completely (16/28 cases,57%) or partially (5/28 case, 18%)revereed Pro's suppressant effects on the induction of SVT.There were clinical recurrcnces of SVT in fiveof 16 patients (31%) treated on a long-term basis (mean 4.5±3.6 months) with Pro,Iso completelyreveroed Pro's supprosant effect on the induction of SVT in four of these five patients (80%).These fivepatients then were treated with Pro and metoprolol and no further clincal recnrrences of SVT.These resultssuggested that reveroal by Iso ofpro's suppresaant effects on the induction of SVT may identify patients whoare likely to experience clinical recurrence of SVT and these patients may benefit from treatment with aB-blocker during longterm therapy with Pro.
文摘Objectives To observe the electrophysiologic effects of propafenone （Prop） on ischemic ventricular tachyarrhythmias. Methods A canine ischemic ventricular tachyarrhythmia model was established in open-chest dogs subjected to programmed electrical stimulation （PES） on 5-8 days after acute myocardial infarction. The electrophysiologic effects of propafenone were observed in the model. Results Propafenone distinctly lengthened the QTc interval （P 〉 0.01） and effective refractory period （ERP） of normal and ischemic ventricular myocardium （NERP and IERP） respectively （P 〉 0.01）, decreased the dispersion of ERP in ischemic myocardium and in left ventricle （P 〉 0.01）, and increased the diastolic excitability threshold of normal and ischemic ventricular myoeardium remarkably （P 〉 0.01）. Propafenone effectively prevented PES-induced ventricular tachycardia （VT） or ventricular fibrillation （VF） （P 〉 0.01） and ischemia-induced VT/VF （P 〉 0.05）. Conclusions The results indicated that the canine model produced by our methods is a worthy and reliable one, propafenone may be effective in preventing the onset of VT / VF after myocardial ischemic damage in dogs, and deserve further attention as an antifibrillatory agent.
文摘Many reviewers have contributed their expertise and time to the peer review, a critical process to ensure the quality of World Journal of Gastrointestinal
文摘We acknowledge our sincere thanks to our reviewers. Many reviewers have contributed their expertise and time to the peer review, a critical process to ensure the quality of our World Series Journals. Both the editors of the journals and authors of the manuscripts submitted to the journals are grateful to the following reviewers
文摘Many reviewers have contributed their expertise and time to the peer review,a critical process to ensure the quality of World Journal of Gastrointestinal
文摘We acknowledge our sincere thanks to our reviewers.Many reviewers have contributed their expertise and time to the peer review,a critical process to ensure the quality of our World Series Journals.Both the editors of the journals and authors of the manuscripts submitted to the journals are grateful to the following reviewers for reviewing the articles(either published or rejected) over the past period of time.
文摘Many reviewers have contributed their expertise and time to the peer review, a critical process to ensure the quality of World Journal of Gastrointestinal Pharmacology and Therapeutics. The editors
