Detection Method:Sandwich
Test principle:This assay employs a two-site sandwich ELISA to quantitate SEMA4D in samples. An antibody specific for SEMA4D has been pre-coated onto a microplate. Standards and samples are pipetted into the wells and anySEMA4D present is bound by the immobilized antibody. After removing any unbound substances, a biotin-conjugated antibody specific for SEMA4D is added to the wells. After washing, Streptavidin conjugated Horseradish Peroxidase (HRP) is added to the wells. Following a wash to remove any unbound avidin-enzyme reagent, a substrate solution is added to the wells and color develops in proportion to the amount of SEMA4D bound in the initial step. The color development is stopped and the intensity of the color is measured.
Product Overview:CD100 was first identified as a cell surface protein of resting T cells; previous studies had shown that it was involved in lymphocyte activation. Hall et al. (1996) cloned CD100 from a cDNA library of phytohemagglutinin-activated human T cells. Sequence analysis showed that CD100 encodes an 863-amino acid polypeptide containing a secretory signal sequence, a single transmembrane domain, an immunoglobulin (Ig)-like domain, and a conserved 500-amino acid sema domain. Thus, Hall et al. (1996) stated that CD100 is a member of the semaphorin family and the first semaphorin believed to be involved in the immune system. See SEMA3F and SEMA3B. Northern blot analysis revealed that CD100 is expressed primarily as a 4.5-kb message in a variety of tissues, both hematopoietic and nonhematopoietic.