Liquid chromatography method for the quantitation of the breast cancer resistance protein ABCG2 inhibitor fumitremorgin C and its chemical analogues in mouse plasma and tissues.

Abstract

Fumitremorgin C (FTC) was recently discovered to be a potent and selective inhibitor of the breast cancer resistance protein (BCRP/ABCG2). FTC was shown to reverse multidrug resistance mediated by BCRP and to increase the cytotoxicity of several anticancer agents in vitro. To support in vivo studies a reverse phase HPLC method with ultraviolet detection was developed to quantitate FTC in mouse plasma and tissues. Further, assay method validation was performed for the determination of FTC in mouse plasma. Plasma standard curves ranged from 0.03 to 30 microg/ml, while the various tissue assay ranges differed to some extent. The sample preparation consisted of acetonitrile precipitation with separation accomplished with a C18 Novapak column and a C18 pre-column utilizing an isocratic mobile phase of ammonium acetate and acetonitrile. UV detection was set at 225 nm for FTC and at 312 nm for roquefortine, the internal standard. The retention times were approximately 9.5 min for FTC and 13.0 min for roquefortine. The recoveries for FTC and roquefortine from plasma were 90.8+/-5.8% and 111.6+/-13.6, respectively. The reported assay can be used for future study of BCRP resistance in vivo in different biological matrices. Further, we found that a more potent analogue of FTC, Ko143, was able to be extracted and detected, with a maximal UV absorbance at 320 nm under the conditions reported.

• Authors: Tushar S Garimella, Douglas D Ross, Kenneth S Bauer
• Journal: Journal of chromatography. B, Analytical technologies in the biomedical and life sciences (J Chromatogr B Analyt Technol Biomed Life Sci) Vol. 807 Issue 2 Pg. 203-8 (Aug 05 2004) ISSN: 1570-0232 [Print] Netherlands
• PMID: 15203030 (Publication Type: Journal Article, Research Support, U.S. Gov't, Non-P.H.S.)

Chemical References

• ABCG2 protein, human
• ATP Binding Cassette Transporter, Subfamily G, Member 2
• ATP-Binding Cassette Transporters
• Indoles
• Neoplasm Proteins
• tryptoquivaline

Topics

• ATP Binding Cassette Transporter, Subfamily G, Member 2
• ATP-Binding Cassette Transporters (antagonists & inhibitors, metabolism)
• Animals
• Breast Neoplasms (metabolism)
• Calibration
• Chromatography, High Pressure Liquid (methods)
• Humans
• Indoles (blood, metabolism)
• Mice
• Neoplasm Proteins (antagonists & inhibitors, metabolism)
• Quality Control
• Reference Standards
• Reproducibility of Results
• Sensitivity and Specificity
• Spectrophotometry, Ultraviolet