Myeloid cell surface antigen CD33, (cluster of differentiation 33) also known as SIGLEC3, siglecs (sialic acid binding Ig-like lectins) and GP67, belongs to the CD33-related SIGLEC gene family. It is a type 1 transmembrane protein and contains two immunoglobulin-like extracellular domains, a single transmembrane area and two intracellular inhibitory motifs. The CD33 gene is mapped to human chromosome 19q13.41.

The antibody HIM3-4 reacts with CD33, a 67 kDa type I transmembrane glycoprotein (immunoglobulin superfamily) expressed on myeloid progenitors, monocytes, granulocytes, dendritic cells and mast cells; it is absent on platelets, lymphocytes, erythrocytes and hematopoietic stem cells.

NFMY-9s human cell line

The reagent is designed for Flow Cytometry analysis. Suggested working dilution is 1:1000. Indicated dilution is recommended starting point for use of this product. Working concentrations should be determined by the investigator.

Association of CD33 (cluster of differentiation 33) with sialic acid-containing ligands causes suppression of proinflammatory pathways in monocytes and macrophages. It is mainly involved in anti-inflammatory signaling, cell adhesion and endocytosis functions. CD33 also works as a myeloid differentiation marker. Mutations in the CD33 gene are associated with Alzheimer′s disease susceptibility and acute myeloid leukemia treatment efficacy. In microglia, increase in the expression of CD33 decreases amyloid β peptide

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Solution in phosphate buffered saline, pH 7.4, with 15 mM sodium azide.

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