Reversible pharmacokinetic profiles of canrenoic acid and its biotransformed product, canrenone in the rat.
作者:Shozo ASADA、Tomoko OHTAWA、Hiroko NAKAE
DOI:10.1248/cpb.38.1012
日期:——
Pharmacokinetic profiles of canrenoic acid (CRA) and canrenone (CR), the reversible metabolite of CRA, were studied in the rat after intraportal (pv) administration in comparison with those after intravenous (iv) administration using an interconversion model In the clearances for the irreversible loss, CL20 of CR was larger then CL10 of CRA. Nevertheless, the real plasma clearance of CR was less than that of CRA. The distribution volume V1 of CRA was almost close to the real distribution volume Vss, real, D of CRA at the steady state. The hepatic available fraction of CRA, FH1 and sequential hepatic available fraction of generated metabolite, FH2, were estimated. Simultaneous computer multi-line fitting of plasma concentration-time data was carried out and the adequacy of pharmacokinetic parameters in this model was tested using the iterative nonlinear least-squares regression program, MULTI.
采用相互转换模型,研究了大鼠体内坎利酸(CRA)和坎利酮(CR)(CRA 的可逆代谢物)的药代动力学特征,并将其与静脉注射(iv)给药后的药代动力学特征进行了比较。然而,CR 的实际血浆清除率低于 CRA。在稳定状态下,CRA 的分布容积 V1 几乎接近 CRA 的实际分布容积 Vss、real、D。对 CRA 的肝脏可利用部分 FH1 和生成的代谢物 FH2 的顺序肝脏可利用部分进行了估算。对血浆浓度-时间数据进行了同步计算机多线拟合,并使用迭代非线性最小二乘回归程序 MULTI 检验了该模型中药动学参数的适当性。