In:
British Journal of Pharmacology, Wiley, Vol. 137, No. 8 ( 2002-12), p. 1280-1286
Abstract:
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/VLB 100 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/VLB 100 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
Type of Medium:
Online Resource
ISSN:
0007-1188
,
1476-5381
DOI:
10.1038/sj.bjp.0704983
Language:
English
Publisher:
Wiley
Publication Date:
2002
detail.hit.zdb_id:
2029728-2
SSG:
15,3
