The RP-1 monoclonal antibody specifically recognizes the RP-1 Antigen. This cell surface marker is expressed on rat peritoneal and peripheral blood neutrophils. Amongst bone marrow cells, the RP-1 Antigen is expressed on band form and mature neutrophils but is not expressed on promyelocytes, myelocytes, and metamyelocytes. The RP-1 antibody does not bind to either rat monocytes, macrophages, eosinophils or to peritoneal neutrophils from mice, rabbits, guinea pigs, or to human peripheral blood neutrophils. Expression of the RP-1 Antigen on rat peritoneal neutrophils is enhanced by cellular stimulation with Phorbol 12-Myristate 13-Acetate (PMA) or Concanavalin A (ConA). Immunoprecipitation and SDS-PAGE analysis of non-treated and PMA-activated rat neutrophil membranes with the RP-1 antibody revealed two main bands of approximately 85 kDa. The RP-1 antibody is also known as the Mouse Anti-Rat Granulocytes antibody.
The antibody was conjugated to BD Horizon BV650 which is part of the BD Horizon Brilliant™ Violet family of dyes. This dye is a tandem fluorochrome of BD Horizon BV421 with an Ex Max of 405-nm and an acceptor dye with an Em Max at 650-nm. BD Horizon BV650 can be excited by the violet laser and detected in a filter used to detect APC-like dyes (eg, 660/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there will be spillover into the APC and Alexa Fluor® 700 detectors. However, the spillover can be corrected through compensation as with any other dye combination.