摘要
目的在小鼠体内,探讨吡嗪酰胺每日给药1次与给药3次在药代动力学上的差别,为吡嗪酰胺的合理应用提供依据。方法将平均体质量(18±2)g的6周龄BALB/c小鼠分为5组,每组30只。分别为单独使用吡嗪酰胺1次/d和3次,d给药组(1组和2组)、单独使用异烟肼-利福平组(3组)、异烟肼-利福平联用吡嗪酰胺1次/d和3次/d给药组(4组和5组)。给药后不同时间点取血,液相色谱-质谱联合检测血药浓度,并计算药代动力学参数血药浓度-时间曲线下面积(AUC)、峰浓度(Cmax)、达峰时间(Tmax)和半衰期(T1/2)。结果吡嗪酰胺单独给药时,1次,d给药组Cmax为(155.3±5.1)μg/ml,AUC0-8h(8h内药时曲线下面积)为269.5mg·h/L,分别是3次/d给药组Cmax(43.2±2.6)μg/ml,AUC0-8h 70.9mg.h/L的3.5倍以上(t=27.71,P〈0.01);当吡嗪酰胺联用异烟肼、利福平给药时,1次/d给药组Cmax为(151.8±17.3)μg/ml,AUC0-8h 383.1mg.h/L也远远高于3次,d给药组Cmax(45.1±1.0)μg/ml,AUC0-8h 81.0mg.h/L(t=8.718,P〈0.05)。而且,当联用异烟肼、利福平并3次/d给药时,吡嗪酰胺对异烟肼有拮抗作用,使异烟肼的Cmax和AUC0-8h 分别由(6.1±0.9)μg/ml和6.6mg.h/L下降为(0.05±0.001)ug/ml和0.2mg.h/L。结论小鼠体内,吡嗪酰胺1次/d给药药代动力学参数优干3次,d给药,尤其是和异烟肼-利福平联用时。
Objective To standardize and rationalize the pyrazinamide (PZA) treatments, pharmacokinetic methods were used to evaluate once-daily and thrice-daily regimens in mice. Methods One hundred and fifty BALB/c mice ( 18 ± 2 g, 6 weeks) were divided into 5 groups, 30 mice in each group. Group 1 and 2 treated with PZA, once-daily and 3 times/day separately, group 3 treated with isoniazid (1NH) and rifampicin (RFP) , group 4 and 5 treated with INH-RFP and once-daily or 3 times/day PZA. Blood samples were collected from 3 mice of each group at different time point after the seventh dose and pooled separately. Serum INH, RFP and PZA levels were determined by HPLC-MS/MS methods. ( AUC, Cmax ,Tmax and T1/2) were calculated. Results Without INH-RFP, Cmax, and AUC0- 8 h of PZA in once-daily regimen were (155.3± 5.1) μg/ml and269.5 mg. h/Lseparately, atleast 3.5 folds than in 3 times/daygroup ( Cmax (43.2±2.6) μ g/ml, AUC0-8h70. 9mg. h /L, t=27.71, P 〈 0.01) . When combined with INH- R FP, Cmax(15.1±17.3) μg/ml andAUC0-8h ( 383. 1 mg.h/L) of PZAin once-daily group is much higher than thrice-daily regimen group ( Cmax ( 45.1 ± 1.0) μ g/ml, AUC0-8 h 81. 0 mg. h/L, t = 8.718, P 〈 0. 05) . Also, PZA antagonized INH in thrice-daily regimen when combined with INH- R FP, accompanied by decreased Cmax ( from ( 6.1 ± 0.9) μg/ml to (0.05 ±0.001 ) μg/ml) andAUC0-8h (from6.6mg.h/Lto0.2mg.h/L) oflNH. Conclusion Inmice, pharmacokinetie parameters once-daily regimen for PZA is better than 3 times/day regimen, especially in concomitant treatment with 1NH-RFP.
出处
《结核病与胸部肿瘤》
2014年第1期1-5,共5页
Tuberculosis and Thoracic Tumor
基金
国家科技部重大专项课题(2012zx09301002005001003)
首都卫生发展科研专项(2011-1010-02)
关键词
结核
药物疗法
吡嗪酰胺
异烟肼
利福平
药代动力学
Tuberculosis/drug therapy
Pyrazinamide
Isoniazid
Rifamycin
Pharmacokinetics