Clinical Chemistry and Laboratory Medicine (CCLM)
Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)
Editor-in-Chief: Plebani, Mario
Ed. by Gillery, Philippe / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Schlattmann, Peter / Tate, Jillian R.
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The Human Multidrug Resistance-Associated Protein (MRP) Gene Family: From Biological Function to Drug Molecular Design
Citation Information: Clinical Chemistry and Laboratory Medicine. Volume 38, Issue 9, Pages 893–897, ISSN (Print) 1434-6621, DOI: 10.1515/CCLM.2000.130, June 2005
- Published Online:
The ATP-binding cassette transmembrane proteins play an important role in transport of drugs as well as of biologically active endogenous substances. The human multidrug resistance-associated protein (MRP) subfamily consists of at least six members, exhibiting a wide spectrum of biological functions. MRP1 operates as an ATP-dependent primary active transporter for substrates conjugated with glucuronide, sulfate or glutathione. Leukotriene C4 is an important endogenous substrate for MRP1. Glutathione serves as a cofactor in MRP1-mediated drug transport as well.
Genes encoding both MRP1 and the catalytic subunit of γ-glutamylcysteine synthetase (γ-GCS) are coordinately regulated in cultured cancer cell lines as well as colorectal cancer tissues from colon cancer patients. The induction of MRP1 and γ-GCS expression by oxidative stress varies among different cell lines, and p53 mutations are associated with elevated levels of induction. To modulate the transport function of MRP1, we have synthesized novel glutathione derivatives as photoreactive biochemical probes targeting the transporter protein. GIF-0019 restored the cellular sensitivity of MRP1-overexpressing drug-resistant cancer cells to anticancer prostaglandins in vitro, which was characterized by enhanced mRNA levels of the cyclin-dependent kinase inhibitor p21, suppressed c-myc expression and G1 arrest.
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