The A3 monoclonal antibody specifically binds to CD148. CD148 is a receptor-type tyrosine phosphatase that belongs to the receptor class 3 subfamily of the protein-tyrosine phosphatase family. CD148 is also known as Density-enhanced phosphatase 1 (DEP-1), Human protein tyrosine phosphatase- η (HPTP-η/HPTP-eta), or Protein tyrosine phosphatase receptor type J (PTPRJ). CD148 is a highly glycosylated type I transmembrane protein that is widely expressed on different cell types including monocytes, granulocytes, dendritic cells, thymocytes, T cells, B cells, NK cells, fibroblasts, and platelets. As a protein tyrosine phosphatase with receptor function, CD148 plays a role in regulating the signaling activities of various phosphorylated cellular proteins including the PDGF Receptor, catenins and Src family kinases. In the immune system, CD148 plays a role in regulating the activities of different cell types. For example, upon T cell activation, CD148 expression is upregulated by T cells. CD148 can subsequently dephosphorylate LAT and PLC-γ signaling proteins and thereby downregulate T cell signaling responses. Immobilized A3 antibody can reportedly augment the proliferation of anti-CD3 antibody-stimulated peripheral blood T cells in culture.
The antibody was conjugated to BD Horizon BUV615 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome with an Ex Max near 350 nm and an Em Max near 615 nm. BD Horizon Brilliant BUV615 can be excited by the ultraviolet laser (355 nm) and detected with a 610/20 filter and a 595 nm LP. Due to the excitation of the acceptor dye by the blue/yellow-green laser line, there may be significant spillover into channels detecting PE-CF594 like emissions (eg, 610/20-nm filter).