The use of Tris-Lipidation to modify drug cytotoxicity in multidrug resistant cells expressing P-glycoprotein or MRP1
作者:Ross A Davey、Mary W Davey、Karen V Cullen、Xanthe E Wells、Craig L Francis、Hua-Ming Williams、Qi Yang、Minoo J Moghaddam、Fred Widmer、Robert G Whittaker
DOI:10.1038/sj.bjp.0704983
日期:2002.12
Increasing the lipophilicity is a strategy often used to improve a compound's cellular uptake and retention but this may also convert it into a substrate for an ATP‐dependent transporter such as P‐glycoprotein or the multidrug resistance‐associated protein (MRP1), which are involved in cellular efflux of drugs. Tris‐Lipidation of compounds is a convenient way of modifying drug lipophilicity and generating an array of derivatives with diverse properties.
To determine the effect of Tris‐Lipidation on a drug's cytoxicity in multidrug resistant cells, various glycyl‐Tris‐mono‐ (GTP1), di‐ (GTP2) and tri‐palmitate (GTP3) derivatives were prepared of the cancer chemotherapeutic drugs chlorambucil and methotrexate, and of the anti‐HIV drug AZT. The cytotoxicity of these derivatives and their parent compounds was determined in the CEM/VLB100 cells with increased P‐glycoprotein expression, the CEM/E1000 cells that overexpress MRP1 and the parent, drug‐sensitive CCRF‐CEM cells.
Increasing the lipophilicity of AZT increased its cytotoxicity in the sensitive CCRF‐CEM parental cell line while decreased cytotoxicity was observed for the methotrexate derivatives. For the chlorambucil derivatives, both increased (GTP1) and decreased (GTP2) cytotoxicity occurred in the CCRF‐CEM cells. With the exception of AZT‐GTP1, all GTP1 and GTP2 derivatives of chlorambucil, methotrexate and AZT had decreased cytotoxicity in the P‐glycoprotein‐expressing CEM/VLB100 cells while chlorambucil‐GTP1, methotrexate‐GTP2 and methotrexate‐GTP3 were the only compounds with decreased cytotoxicity in the MRP1‐overexpressing CEM/E1000 cells.
The number of palmitate residues, the position of derivatisation and the type of linkage all may affect the P‐glycoprotein and MRP1 substrate properties.
Tris‐Lipidation may therefore provide a useful way of manipulating the pharmacokinetic properties of drugs.
British Journal of Pharmacology (2002) 137, 1280–1286. doi:10.1038/sj.bjp.0704983
增加疏水性是改善化合物细胞摄取和保留的常见策略,但也可能引发化合物成为ATP依赖性转运蛋白(如P-糖蛋白或多药耐药相关蛋白(MRP1))的底物,这些蛋白参与药物的细胞外排。将化合物进行三酰化是调节药物疏水性的一种简便方法,能够生成一系列具有不同特性的衍生物。
为了研究药物三酰化对多重耐药细胞毒性的影响,制备了抗癌化疗药物卡奇霉素和甲氨蝶呤以及抗HIV药物AZT的甘氨酰-Tris-单(GTP1)、双(GTP2)和三棕榈酰(GTP3)衍生物。在具有P-糖蛋白高表达的CEM/VLB100细胞、MRP1高表达的CEM/E1000细胞及其亲本药物敏感的CCRFR-CEM细胞中,研究了这些衍生物及其母体化合物的细胞毒性。
AZT的疏水性增加提高了其在敏感的CCRFR-CEM亲本细胞系中的细胞毒性,而甲氨蝶呤衍生物的细胞毒性有所降低。对于卡奇霉素衍生物,在CCRFR-CEM细胞中,GTP1增加细胞毒性,GTP2降低。除了AZT-GTP1,所有GTP1和GTP2的卡奇霉素、甲氨蝶呤和AZT衍生物在P-糖蛋白表达的CEM/VLB100细胞中细胞毒性降低,而在MRP1过表达的CEM/E1000细胞中仅有卡奇霉素-GTP1、甲氨蝶呤-GTP2 和甲氨蝶呤-GTP3 的细胞毒性降低。
棕榈酸残基的数量、修饰的位置和连接方式均可能影响P-糖蛋白和MRP1底物特性。
因此,药物的三酰化可能提供一种有效手段,用于调节药物的药代动力学特性。
英国药理学杂志 (2002) 137, 1280–1286。doi:10.1038/sj.bjp.0704983