Cd47 (CD47 antigen)
CD47 is an integrin associated protein (IAP) and is an immunoglobulin superfamily member. CD47 is widely expressed on cell surface and interacts with the signal regulatory protein α (SIRPα), thrombospondin-1 (TSP1) and integrins to mediate a series of responses including apoptosis, proliferation and immunity. CD47 is an important “self ” mark on the cell surface and inhibits macrophagocytosis by interaction with SIRPα on macrophage surface. Animal studies have shown that a CD47 antibody is an effective treatment for multiple types of tumors. CD47 is another target for tumor immunity following PD-1/PD-L1.
BALB/c : inbred strain used for oncology, immunology, neurobiology and inflammation studies, easily produces plasma cell tumors after injection of mineral oil. A variety of mouse tumor cell lines were derived from the BALB/c background, and this strain is good for tumor formation.
Protein expression analysis
Fig 2. Splenocytes from both wild type (WT) BALB/c and heterozygous B-hCD47 (B/c) mice were analyzed by flow cytometry.
Mouse CD47+ T cells were detected in both WT BALB/c and heterozygous B-hCD47 (B/c) mice, while human CD47+ T cells were only detected in the heterozygous B-hCD47 (B/c) mice.