MUC-24/CD164

MUC-24/CD164 is a transmembrane sialomucin encoded by the CD164 gene, historically known as MGC-24 or endolyn, with two mucin-like domains rich in sialylated and sulfated O-linked glycans. It localizes to endosomes and the cell surface and is expressed on hematopoietic progenitors, bone marrow stromal cells and subsets of lymphocytes and epithelial cells. Functionally, CD164 modulates adhesive and migratory interactions between hematopoietic stem cells and the stromal microenvironment and has been reported to restrain primitive progenitor proliferation while supporting quiescence. Its expression in acute myeloid leukemia and other malignancies has drawn interest as a marker of primitive, stem-like tumor compartments.