The SB/199 monoclonal antibody specifically binds to mouse CD127 which is also known as, the Interleukin-7 Receptor alpha chain (IL-7Rα). CD127 associates with CD132 (common γ chain) to form a high-affinity signaling IL-7R complex that mediates the biological effects of IL-7. CD127 can also complex with the Thymic Stromal Lymphopoietin Receptor (TSLPR) subunit to bind and mediate cellular responses to TSLP. CD127 is a 65-75 kDa type-I transmembrane protein that belongs to the hematopoietin receptor and the Ig gene superfamilies. Mice lacking CD127 display profoundly impaired development of the B and T lymphoid cell lineages, but display no obvious nonlymphoid abnormalities. IL-7Rα is expressed on common lymphoid progenitors and early stages of B lineage development in the bone marrow, on the earliest thymocyte progenitors, on CD4-CD8- double-negative and CD4+ and CD8+ single-positive thymocytes, and on most peripheral T lymphocytes. Intestinal intraepithelial lymphocytes with low-density γδ TCR expression upregulate CD127 expression in response to IL-2, which may be secreted by neighboring αβ TCR+ T cells.
The antibody was conjugated to BD Horizon BUV737 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 737 nm. BD Horizon Brilliant BUV737 can be excited by the ultraviolet laser (355 nm) and detected with a 740/35 nm filter. Due to the excitation of the acceptor dye by the red laser line, there may be significant spillover into red laser detectors with filters in the 700-720 nm range.
