Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri- Kansas City, 2464 Charlotte Street, Kansas City, MO 64108, USA.
Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri- Kansas City, 2464 Charlotte Street, Kansas City, MO 64108, USA.
Int J Pharm. 2014 Dec 10;476(1-2):99-107. doi: 10.1016/j.ijpharm.2014.09.035. Epub 2014 Sep 26.
Oral absorption of lopinavir (LPV) is limited due to P-glycoprotein (P-gp) and multidrug resistance-associated protein2 (MRP2) mediated efflux by intestinal epithelial cells. Moreover, LPV is extensively metabolized by CYP3A4 enzymes. In the present study, dipeptide prodrug approach was employed to circumvent efflux pumps (P-gp and MRP2) and CYP3A4 mediated metabolism of LPV. Valine-isoleucine-LPV (Val-Ile-LPV) was synthesized and identified by LCMS and NMR techniques. The extent of LPV and Val-Ile-LPV interactions with P-gp and MRP2 was studied by uptake and transport studies across MDCK-MDR1 and MDCK-MRP2 cells. To determine the metabolic stability, time and concentration dependent degradation study was performed in liver microsomes. Val-Ile-LPV exhibited significantly higher aqueous solubility relative to LPV. This prodrug generated higher stability under acidic pH. Val-Ile-LPV demonstrated significantly lower affinity toward P-gp and MRP2 relative to LPV. Transepithelial transport of Val-Ile-LPV was significantly higher in the absorptive direction (apical to basolateral) relative to LPV. Importantly, Val-Ile-LPV was recognized as an excellent substrate by peptide transporter. Moreover, Val-Ile-LPV displayed significantly higher metabolic stability relative to LPV. Results obtained from this study suggested that dipeptide prodrug approach is a viable option to elevate systemic levels of LPV following oral administration.
洛匹那韦(LPV)的口服吸收受到肠道上皮细胞 P 糖蛋白(P-gp)和多药耐药相关蛋白 2(MRP2)介导的外排作用限制。此外,LPV 广泛被 CYP3A4 酶代谢。在本研究中,采用二肽前药方法来规避外排泵(P-gp 和 MRP2)和 CYP3A4 介导的 LPV 代谢。缬氨酸-异亮氨酸-LPV(Val-Ile-LPV)通过 LCMS 和 NMR 技术进行合成和鉴定。通过 MDCK-MDR1 和 MDCK-MRP2 细胞的摄取和转运研究,研究了 LPV 和 Val-Ile-LPV 与 P-gp 和 MRP2 的相互作用程度。为了确定代谢稳定性,在肝微粒体中进行了时间和浓度依赖性降解研究。与 LPV 相比,Val-Ile-LPV 具有显著更高的水溶解度。该前药在酸性 pH 下表现出更高的稳定性。与 LPV 相比,Val-Ile-LPV 对 P-gp 和 MRP2 的亲和力显著降低。与 LPV 相比,Val-Ile-LPV 的跨上皮转运在吸收方向(顶侧到基底外侧)显著更高。重要的是,Val-Ile-LPV 被鉴定为肽转运体的优良底物。此外,Val-Ile-LPV 与 LPV 相比显示出更高的代谢稳定性。本研究结果表明,二肽前药方法是提高 LPV 口服后全身水平的可行选择。
Int J Pharm. 2014-9-26
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