The 15D3 monoclonal antibody specifically recognizes P-glycoprotein which is also known as CD243, ATP-binding cassette subfamily B member 1 (ABCB1) or Multidrug resistance protein 1 (MDR1). P-glycoprotein is a ~170 kDa transmembrane glycoprotein protein that spans the membrane 12 times. P-glycoprotein acts as an ATP-dependent efflux pump for a large variety of drugs. It may be expressed at high levels by multidrug resistant (MDR) tumor cells. This efflux activity may lead to cellular resistance to the drugs used in chemotherapy. P-glycoprotein is present in many normal cell types including endothelial, epithelial, or secretory cells, and might protect them from naturally occurring xenobiotics.
The antibody was conjugated to BD Horizon™ BV510 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 405-nm and Em Max at 510-nm, BD Horizon BV510 can be excited by the violet laser and detected in the BD Horizon V500 (525/50-nm) filter set. BD Horizon BV510 conjugates are useful for the detection of dim markers off the violet laser.