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Increased sensitivity to anticancer drugs and decreased inflammatory response in mice lacking the multidrug resistance-associated protein

Increased sensitivity to anticancer drugs and decreased inflammatory response in mice lacking the... The multidrug resistance-associated protein (MRP) mediates the cellular excretion of many drugs, glutathione S-conjugates (GS-X) of lipophilic xenobiotics and endogenous cysteinyl leukotrienes1–5. Increased MRP levels in tumor cells can cause multidrug resistance (MDR) by decreasing the intracellular drug concentration. The physiological role or roles of MRP remain ill-defined, however. We have generated MRP-deficient mice by using embryonic stem cell technology. Mice homozygous for the mrp mutant allele, mrp −/−, are viable and fertile, but their response to an inflammatory stimulus is impaired. We attribute this defect to a decreased secretion of leukotriene C4 (LTC4) from leukotriene-synthesizing cells. Moreover, the mrp −/− mice are hypersensitive to the anticancer drug etoposide. The phenbtype of mrp −/− mice is consistent with a role for MRP as the main LTC4-exporter in leukotriene-synthesizing cells, and as an important drug exporter in drug-sensitive cells. Our results suggest that this ubiquitous6 GS-X pump7,8 is dispensable in mice, making treatment of MDR with MRP-specific reversal agents potentially feasible. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Medicine Springer Journals

Increased sensitivity to anticancer drugs and decreased inflammatory response in mice lacking the multidrug resistance-associated protein

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References (30)

Publisher
Springer Journals
Copyright
Copyright © 1997 by Nature Publishing Group
Subject
Biomedicine; Biomedicine, general; Cancer Research; Metabolic Diseases; Infectious Diseases; Molecular Medicine; Neurosciences
ISSN
1078-8956
eISSN
1546-170X
DOI
10.1038/nm1197-1275
Publisher site
See Article on Publisher Site

Abstract

The multidrug resistance-associated protein (MRP) mediates the cellular excretion of many drugs, glutathione S-conjugates (GS-X) of lipophilic xenobiotics and endogenous cysteinyl leukotrienes1–5. Increased MRP levels in tumor cells can cause multidrug resistance (MDR) by decreasing the intracellular drug concentration. The physiological role or roles of MRP remain ill-defined, however. We have generated MRP-deficient mice by using embryonic stem cell technology. Mice homozygous for the mrp mutant allele, mrp −/−, are viable and fertile, but their response to an inflammatory stimulus is impaired. We attribute this defect to a decreased secretion of leukotriene C4 (LTC4) from leukotriene-synthesizing cells. Moreover, the mrp −/− mice are hypersensitive to the anticancer drug etoposide. The phenbtype of mrp −/− mice is consistent with a role for MRP as the main LTC4-exporter in leukotriene-synthesizing cells, and as an important drug exporter in drug-sensitive cells. Our results suggest that this ubiquitous6 GS-X pump7,8 is dispensable in mice, making treatment of MDR with MRP-specific reversal agents potentially feasible.

Journal

Nature MedicineSpringer Journals

Published: Nov 1, 1997

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