Recombinant Human B7-H3/ICOSLG, His (HEK293-expressed) 是 HEK293 細胞中產生的 C-末端含 His 標簽的多肽鏈。B7-H3 是來自 B7 分子家族的免疫檢查點。 Synonyms rHuB7-H3/ICOSLG, His; B7H3; B7 homolog 3; CD276 Species HumanSource HEK 293 Accession Q5ZPR3 Gene ID 80381 Molecular Weight 40-42 kDa AA Sequence LEVQVPEDPV VALVGTDATL CCSFSPEPGF SLAQLNLIWQ LTDTKQLVHS FAEGQDQGSA YANRTALFPD LLAQGNASLR LQRVRVADEG SFTCFVSIRD FGSAAVSLQV AAPYSKPSMT LEPNKDLRPG DTVTITCSSY RGYPEAEVFW QDGQGVPLTG NVTTSQMANE QGLFDVHSVL RVVLGANGTY SCLVRNPVLQ QDAHGSVTIT GQPMTFPHHH HHHHHHH Appearance Lyophilized powder. Formulation Lyophilized after extensive dialysis against PBS. Endotoxin Level <0.2 EU/μg, determined by LAL method. Reconstitution Reconstitute the lyophilized recombinant Human B7-H3/ICOSLG, His (HEK293-expressed) (rHuB7-H3/ICOSLG, His) to 100 μg/mL using ddH2O or diluted with PBS. Storage & Stability Lyophilized recombinant Human B7-H3/ICOSLG, His (HEK293-expressed) (rHuB7-H3/ICOSLG, His) is stored at -20°C. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer. It is recommended to freeze aliquots at -20°C or -80°C for extended storage. Shipping Room temperature in continental US; may vary elsewhere. Background As a member of the B7 family, inducible co-stimulator ligand (ICOSLG) expressed on tumor cell has been reported to have an important role in tumor immunity. As the counter ligand of ICOS, a CD28-related molecule, ICOSLG is expressed on professional antigen-presenting cell (APCs; such as dendritic cells (DCs) and B cells) and on some tumor cells (such as glioma cells and gastric carcinoma cells). ICOSLG is the only B7 family member that preferentially co-stimulates type 2T helper cell (Th2) responses, and interestingly, this unique molecule has a critical role in antitumor immunity. ICOSLG expression on solid tumors (implanted-transfected tumors) aids in both NK mediated and CD8+ cytotoxic T cell (CTL) activation and killing. Several studies using ICOSLG-transfected solid tumor cell lines found that ICOSLG induced CD8+ cytotoxic lymphocyte-mediated tumor regression[1]. |