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首页> 外文期刊>Journal of pharmaceutical sciences. >Pulmonary absorption rate and bioavailability of drugs in vivo in rats: Structure-absorption relationships and physicochemical profiling of inhaled drugs.
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Pulmonary absorption rate and bioavailability of drugs in vivo in rats: Structure-absorption relationships and physicochemical profiling of inhaled drugs.

机译:大鼠体内药物的肺吸收率和生物利用度:吸入药物的结构吸收关系和理化特性。

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The aim of this investigation was to analyze the structure-absorption relationships for pulmonary delivered drugs. First, the inhaled drugs on the market during 2001 were identified and a profile of the calculated physicochemical properties was made. Second, an in vivo pharmacokinetic investigation was performed in anesthetized rats. Eight selected drugs were administered by intratracheal nebulization and intravenous bolus administration and the plasma concentrations of the drugs were determined by LC-MS-MS. Third, an evaluation of the relationships between the absorption/bioavailability data and the drugs' physicochemical characteristics and the epithelial permeability in Caco-2 cells, respectively, was performed. The drug absorption rate was found to correlate to the molecular polar surface area and the hydrogen bonding potential, as well as to the apparent permeability in Caco-2 cell monolayers, which indicated that passive diffusion was the predominating mechanism of absorption in the rat lung. In contrast to the intestinal mucosa and the blood-brain barrier, the pulmonary epithelium was shown to be highly permeable to compounds with high molecular polar surface area (e.g., PSA 479 A(2)). Furthermore, a high bioavailability was found for the efflux transporter substrates talinolol (81%) and losartan (92%), which provides functional evidence for a quantitatively less important role for efflux transporters, such as P-glycoprotein, in limiting the absorption of these drugs from the rat lung. In conclusion, the pulmonary route should be regarded as a potential alternative for the delivery of drugs that are inadequately absorbed after oral administration.
机译:这项研究的目的是分析肺部递送药物的结构吸收关系。首先,确定了2001年市场上的吸入药物,并对计算出的理化特性进行了分析。其次,在麻醉的大鼠中进行体内药代动力学研究。通过气管内雾化和静脉内推注施用八种选择的药物,并通过LC-MS-MS测定药物的血浆浓度。第三,分别评估了吸收/生物利用度数据与药物的理化特性和Caco-2细胞上皮通透性之间的关系。发现药物吸收速率与分子极性表面积和氢键电势以及在Caco-2细胞单层中的表观渗透性相关,这表明被动扩散是大鼠肺吸收的主要机制。与肠粘膜和血脑屏障不同,肺上皮被证明对具有高分子极性表面积的化合物具有高渗透性(例如PSA 479 A(2))。此外,发现外排转运蛋白底物塔利洛尔(81%)和氯沙坦(92%)具有很高的生物利用度,这为外排转运蛋白(例如P-糖蛋白)在限制这些物质的吸收方面起定量上不太重要的作用提供了功能性证​​据。药物来自大鼠肺。总之,肺部途径应被视为口服给药后吸收不足的药物的潜在替代选择。

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