SpecificityCD22 is in principle a B lineage antigen, that is present in the cytoplasm of progenitor B-cells and on the membrane of the majority of mature peripheral B-lymphocytes. Furthermore, it is strongly expressed on Hairy Cell Leukemia cells and very weakly on some other leukemias.
Peripheral blood lymphocytes 12±3%
T-cells (E+) < 1%
B-cells (E-, Ig+) 92±3%
Monocytes (CD14+) < 1%
Granulocytes < 1%
Thymocytes < 1%
Purification notesPurification by IEP (immunoelectrophoresis).
Primary antibody notesab23620 can be used for:
- Quantitative determination of peripheral B-cells (CD22+) in blood.
- Identification of CD22+-cells in tissue sections.
- Determination of B-cell origin of lymphoid neoplasms.
- Quantitative elimination or isolation of B-cells by flow cytometry or magnet beads.
The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.
Use at an assay dependent concentration.
Use 5µl for 106 cells.
Use maximum of 5µl for 106 cells.
ab91357-Mouse monoclonal IgG1, is suitable for use as an isotype control with this antibody.
Application notesIs unsuitable for IHC-P.
FunctionMediates B-cell B-cell interactions. May be involved in the localization of B-cells in lymphoid tissues. Binds sialylated glycoproteins; one of which is CD45. Preferentially binds to alpha-2,6-linked sialic acid. The sialic acid recognition site can be masked by cis interactions with sialic acids on the same cell surface. Upon ligand induced tyrosine phosphorylation in the immune response seems to be involved in regulation of B-cell antigen receptor signaling. Plays a role in positive regulation through interaction with Src family tyrosine kinases and may also act as an inhibitory receptor by recruiting cytoplasmic phosphatases via their SH2 domains that block signal transduction through dephosphorylation of signaling molecules.
DomainContains 4 copies of a cytoplasmic motif that is referred to as the immunoreceptor tyrosine-based inhibitor motif (ITIM). This motif is involved in modulation of cellular responses. The phosphorylated ITIM motif can bind the SH2 domain of several SH2-containing phosphatases.
Post-translational modificationsPhosphorylation of Tyr-762, Tyr-807 and Tyr-822 are involved in binding to SYK, GRB2 and SYK, respectively. Phosphorylation of Tyr-842 is involved in binding to SYK, PLCG2 and PIK3R1/PIK3R2. Phosphorylated on tyrosine residues by LYN.
Sialic acid binding immunoglobulin like lectin 2 antibody
Sialic acid-binding Ig-like lectin 2 antibody
SIGLEC 2 antibody
T cell surface antigen Leu 14 antibody
T-cell surface antigen Leu-14 antibody
References for Anti-CD22 antibody [RFB4] (Phycoerythrin) (ab23620)
This product has been referenced in:
Ito D et al. Exclusion of cytoplasmic fragments in flow cytometric analysis of lymph node samples from dogs with lymphoma using membrane-permeable violet laser-excitable DNA-binding fluorescent dye (DyeCycle Violet). Vet Clin Pathol39:494-8 (2010).
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