Recombinant CD34 (Hematopoietic Stem Cell & Endothelial Marker) [HPCA1/8333R]



CD34 (also named myeloid progenitor cell antigen) is a heavily glycosylated type I transmembrane protein. There are two forms of the CD34 protein, resulting from alternative splicing. The functions of CD34 is largely unknown, but recent evidence suggests a role for CD34 in cell adhesion and inhibition of hematopoiesis. It is suggested that CD34 is a signaling molecule involved in maintenance of a phenotypically plastic state in undifferentiated cells. CD34 is found in most endothelia, expressed on the luminal surface and membrane processes interdigitating between endothelial cells, but is absent from large veins and arteries. CD34 is furthermore expressed in fibroblast-like dendritic cells in, e.g., portal tracts of the liver, Peyer's patches, and in healing wounds. In smooth muscle cells, a variable CD34 staining is found. In tumor tissues, CD34 is detected in myeloid blasts in myelodysplastic syndrome and acute myeloid leukemia in most cases as well as lymphoblasts in most cases of B-acute lymphoblastic leukemia. Mature B- and T-cell lymphomas and leukemias are CD34 negative. The majority of vascular tumors, including hemangiosarcoma and Kaposi sarcoma are CD34positive. In a panel, CD34 staining is useful for the classification of myeloid and lymphoid neoplasms as well as spindle cell neoplasms (particularly identification of gastrointestinal stromal tumor and hemangiosarcoma).

Product Properties & Targets

Species Reactivity
Cellular Localization
Cell surface.
Gene Name
Positive Control
Jurkat or KG-1 cells. Human tonsil or angiosarcoma.
Recombinant full-length human HPCA1 protein
Alternate Names
Hematopoietic progenitor cell antigen CD34, Hematopoietic Progenitor Cell Antigen, HPCA1, Mucosialin

Database Links

Entrez Gene ID

Additional Information

Human Gene Symbol
Chromosome Location
Mol. Weight of Antigen


  • Possible adhesion molecule with a role in early hematopoiesis by mediating the attachment of stem cells to the bone marrow extracellular matrix or directly to stromal cells. Could act as a scaffold for the attachment of lineage specific glycans, allowing stem cells to bind to lectins expressed by stromal cells or other marrow components. Presents carbohydrate ligands to selectins.

Known Applications & Suggested Dilutions

  • Immunohistochemistry (Formalin-fixed) (1-2ug/ml for 30 minutes at RT),(Staining of formalin-fixed tissues requires heating tissue sections in 10mM Tris with 1mM EDTA, pH 9.0, for 45 min at 95&degC followed by cooling at RT for 20 minutes),Optimal dilution for a specific application should be determined.

Key References

  • Felshow DM et al. Blood 97:3768-3775 (2001).
  • Sato T et al. Blood 94:2548-2554 (1999).

Storage & Stability

Antibody with azide - store at 2 to 8°C. Antibody without azide - store at -20 to -80°C. Antibody is stable for 24 months. Non-hazardous. No MSDS required.


This antibody is available for research use only and is not approved for diagnosis.

Supplied as

200ug/ml of recombinant MAb purified by Protein A/G. Prepared in 10mM PBS with 0.05% BSA & 0.05% azide. Also available WITHOUT BSA & azide at 1.0mg/ml.


There are no warranties, expressed or implied, which extend beyond this description. Company is not liable for any personal injury or economic loss resulting from this product.


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