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a German Research Centre for Biotechnology, Department of Applied Genetics;
b Division of Microbiology;
c Department of Biochemical Engineering;
d Department of Gene Regulation and Differentiation, Braunschweig, Germany;
e DKFZ, Institute of Cellular and Molecular Pathology, Heidelberg, Germany;
f Ulm University Medical Center, Department of Internal Medicine II, Ulm, Germany; Weizmann Institute of Science,
g Department of Immunology and
h Department of Molecular Cell Biology, Rehovot, Israel
Key Words. Immune V-gene phage display library • Single-chain antibody • Human VEGF receptor 2 • FACS analysis • Hematopoitic stem cell
Thomas Böldicke, Ph.D., German Research Centre for Biotechnology, Department of Applied Genetics, Mascheroder Weg 1, D-38124 Braunschweig, Germany. Telephone: 49-(0)531-6181-209; Fax: 49-(0)531-6181-202; e-mail: tbo{at}gbf.de
Five specific single-chain antibodies recognizing the human vascular endothelial growth factor receptor-2 (VEGFR-2/KDR) were selected from a V-gene phage display library constructed from mice immunized with the extracellular domain of VEGFR-2 (Ig-like domain 1-7). All five scFv antibodies (A2, A7, B11, G3, and H1) bound to the purified native antigen in enzyme-linked immunosorbent assay and Dot Blot, and showed no crossreactivity to the human VEGF-receptor 1 (VEGFR-1). The selected antibodies recognize a conformation-dependent epitope of the native receptor and do not recognize denatured antigen in Western blots, as well as linear overlapping peptides comprising the sequence of the human VEGFR-2. The five scFv antibodies bind to the surface of endothelial cells overexpressing human VEGFR-2 c-DNA (PAE/VEGFR-2 cells) as detected by surface immunofluorescence using confocal microscopy. In addition scFv A7 specifically detected VEGFR-2 expressing endothelial cells in the glomerulus of frozen human kidney tissue sections. Therefore, A7 has potential clinical application as a marker for angiogenesis in cryosections of different human tissues. Additionally, two recombinant scFvs (A2 and A7) very efficiently recognize VEGFR-2 on PAE/VEGFR-2 cells and freshly prepared human umbilical vein endothelial cells by fluorescence-activated cell sorter (FACS) analysis. The scFv fragment A7, which was the most sensitive antibody in FACS analysis, recognizes human CD34+VEGFR-2+ hematopoietic immature cells within the population of enriched CD34+ cells isolated from human cord blood. The dissociation constant of A7 was determined to be Kd = 3.8 x 10–9 M by BIAcore analysis. In conclusion, scFv fragment A7 seems to be an important tool for FACS analysis and cell sorting of vascular endothelial cells, progenitor cells and hematopoitic stem cells, which are positive for VEGFR-2 gene expression.
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