The CD109 antigen is a monomeric glycosyl phosphatidylinositol (GPI)-linked glycoprotein of 170 kDa that contains several N-linked endoglycosidase H-sensitive hybrid-type glycans but no O-linked glycan. It has been reported as a novel member of the α2 macroglobulin (α2M) / C3, C4, C5 family of thioester-containing proteins. The CD109 antigen is found on vascular endothelial cells, some epithelial cells, activated, but not resting, T-cells, activated, but not resting, platelets, leukemic megakaryoblasts and a subset of bone marrow CD34+ cells. This antigen is not expressed on fresh peripheral blood lymphocytes (PBL). Poorly differentiated (CD34+, TdT+, CD7+) T-acute leukemias and rare cases of chronic myeloid leukemia in megakaryoblast crisis express the CD109 antigen. Furthermore, megakaryoblastoid cell lines (MO7e, MOLM-1) are CD109+. The CD109 antigen, strongly expressed on KG1a cell line with 20,000 binding sites per cell, may represent a very early marker for hematopoietic cells committed to the megakaryocyte lineage. In contrast, the adult bone marrow CD34+ CD109+ subset identifies the most primitive hematopoietic stem cells capable of long-term culture and lymphoid progenitors of the B-cell lineage.

Specifications

Specificity CD109
Form PE
Clone 8A3
Flow Product Line IOTest
Isotype IgG2a Mouse
Format Liquid
Size 100 Tests
Regulatory Status RUO
Target Species Human
Other Names 8A3, CD109, E123, PAF, Platelet activation factor
UNSPSC 41116015

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