采用Caco-2细胞和动物模型,以维拉帕米为阳性对照,考察普朗尼克对塞利洛尔在Caco-2单层膜与肠道黏膜吸收的影响。用高效液相色谱法检测药物浓度,计算表观透过系数、吸收速率常数与有效透过系数等参数,评价普朗尼克对P-糖蛋白药泵的抑制作用。结果显示,塞利洛尔Caco-2细胞膜转运基底端(BL)到顶端(AP)的透过系数P。大于AP到BL的Papp,分别为(2.10±0.13)×10^-6和(0.333±0.018)×10^-5cm·s^-1,且双向转运受到抑制剂维拉帕米和普朗尼克的影响。大鼠在体肠灌流实验中塞利洛尔在十二指肠段、空肠、回肠与结肠段的吸收速率常数ka分别为(0.09±0.03),(0.14±0.04),(0.11±0.03)与(0.05±0.02)h^-1;合用维拉帕米后各肠段吸收速率常数ka分别为(0.14±0.03),(0.24±0.02),(0.25±0.03)和(0.23±0.02)h^-1;合用普朗尼克后各肠段吸收速率常数ka分别为(0.13±0.02),(0.22±0.02),(0.22±0.03)和(020±0.03)h^-1。可见,普朗尼克通过抑制P-gp外排作用,促进塞利洛尔Caco-2细胞膜和大鼠肠道黏膜的吸收。
To investigate the inhibitory effect of Pluronic on P-glycoprotein (P-gp) drug efflux pump, Caco-2 cells and animal models were established to study the influence of Pluronic on celiprolol transport across Caco-2 cell monolayer and intestinal mucous membrane with verapamil set as a positive control. Drug concentration was measured by HPLC and the apparent permeability coefficient (Papp) , absorption rate constant (ko) and the effective permeability coefficient (Poll) were calculated. Papp of basolateral to apical side and apical to basolateral side was (2.10 ± 0. 13) ×10^-6 and (0.333 ± 0.018) ×10^-6 cm·s^-1 , respectively. Transports of celiprolol across Caco-2 cell monolayer were influenced by both verapamil and Pluronic. The absorption constants (k,) of celiprolol at duodenum, jejunum, ileum, and colon were (0.09±0.03), (0.14±0.04), (0.11 ±0.03) and (0.05 ±0.02) h^-1, ka of celiprolol in verapamilgroup were (0.14±0.03), (0.24±0.02), (0.25 ±0.03) and (0.23 ±0.02) h^-1, and ka of celiprolol in Pluronic group were(0. 13 ±0.02), (0.22 ±0. 02), (0.22 ±0.03) and (0.20 ±0.03) h^-1, respectively. Pluronic showed significant effect on inhibiting P-gp of Caco-2 cell and intestinal mucosa in rats.