CD34 at a glance

CD34, one of the mucosialins, is a highly glycosylated transmembrane phosphoglycoprotein, which has a great importance in selection and enrichment of hematopoietic stem/progenitor cells (HSPC) for bone marrow transplantation. It is expressed on cells from diverse tissues that have comparable properties, such as the progenitor and stem cell activity, as well as the transdifferentiation potential. Namely it is on hematopoietic stem cells (HSC), multipotent mesenchymal stromal cells (MSC), muscle satellite cells, keratocytes, hair follicle epithelial stem cells, vascular endothelial progenitors, and other. On these cells, CD34 is coexpressed with tissue specific markers, and its expression is lost upon activation of differentiation process. CD34 is also being used as one of the markers for staining blasts in acute myeloid leukemia, and it is also expressed in some tumors.

Antibodies specific for CD34 have been classified according to the type of their epitope into several groups:

  • Class I (Ia, Ib): Epitope is sensitive to treatment with neuraminidase and glycoprotease (class Ia: very sensitive, class Ib: partially sensitive).
  • Class II: Epitope is sensitive to glycoprotease, but it is resistant to neuraminidase. Example: clone QBEnd-10 (HLDA workshop V).
  • Class III: Epitope is resistant both to neuraminidase and to glycoprotease (glycosylation-independent epitope). Example: clones 4H11 (HLDA workshop VI), 581 (HLDA workskop V); both clones have comparable flow cytometry staining pattern.

Current CD34 antibody products in our portfolio:

Clinical products:

CD34QuantiFlowEx kit
The CD34 QuantiFlowEx Kit is intended for identification and percentage enumeration of total viable CD34+ stem cells from total viable leucocytes in specimens with determined white blood cell (WBC) count.

SingleFlowEx CD34 reagents
SingleFlowEx is fluorochrome-labeled monoclonal antibody single reagent for use in laboratory-developed multicolor flow cytometry tests in order to examine human clinical samples.
SingleFlowEx can be used in various multicolor combinations. Laboratory shall establish the SingleFlowEx performance characteristics in conjunction with other reagents in normal and pathological samples.
Available formats: 
Pacific Blue™, FITC, PE, PE-DyLight® 594, PerCP-Cy™5.5, PE-Cy™7, APC

Research products

Clone name 4H11 581 QBEnd-10
Clone applications FC, ICC, IHC(P), WB FC, IHC(F) WB, IP, IHC(P), IHC(F) , ICC, FC, FUNC
Purified 11-297-C100 11-664-C100  
Low endotoxin     10-566-C100
Biotin 1B-297-T100    
Pacific Blue™ PB-297-T100    
FITC 1F-297-T100 1F-664-T100 1F-566-T100
Alexa Fluor® 488 A4-297-T100    
Pacific Orange™ PO-297-T100  coming soon    
PE 1P-297-T100 1P-664-T100 1P-566-T100
PE-DyLight® 594 T5-297-T100    
APC 1A-297-T100 1A-664-T100  
PE-Cy™5   T8-664-T100  
PerCP   PC-664-T100  
PerCP-Cy™5.5   T9-664-T100  
Alexa Fluor® 700 A7-297-T100    
PE-Cy™7 T7-297-T100    


Fig.1: Flow cytometry analysis (surface staining) of CD34+ cells in human peripheral blood with anti-CD34 (clone 581) PerCP.

Fig.2: Western blotting analysis of human CD34 using mouse monoclonal antibody QBEnd-10 on lysates of TF-1 cell line and HEK293T/17 cell line (CD34 non-expressing cell line; negative control) under non-reducing and reducing conditions. Nitrocellulose membrane was probed with 2 µg/ml of mouse anti-CD34 monoclonal antibody QBEnd-10 followed by IRDye800-conjugated anti-mouse secondary antibody. A specific band was detected for CD34 protein at approximately 110 kDa.

Would you like to have our antibodies in other formates? Let us know!