Abstract
Multidrug resistance (MDR) is one of the major obstacles to successful cancer chemotherapy. Since P-glycoprotein (P-gp) encoded by the MDR-1 gene plays a key role in MDR, many P-gp-specific monoclonal antibodies (MAbs) have been generated for characterization and analysis of P-gp. Among those antibodies, MRK16 has been widely used not only for elucidation of the mechanisms of P-gp-mediated MDR but also for diagnostic and therapeutic studies. Two types of magnetic cell sorting assays, termed MRK16-MACS and MRK16-MACS-FACS, have been established by us and may offer a useful tool to quantitate low levels of P-gp expression. This article describes the characteristics of the antibodies against P-gp and discuss the diagnostic implications of the antibodies.
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