Abstract:
:For two decades, the antigen recognized by the Pathologische Anatomie Leiden-Endothelium (PAL-E) monoclonal antibody, a standard vascular endothelial cell marker, has remained elusive. Here, we used a combinatorial phage display-based approach ("epitope mapping") to select peptides binding to the original PAL-E antibody. We found that a subset of the selected panel of peptides had motifs with strong homology to an exposed site within the b1 domain of human neuropilin-1 (NRP-1). We confirmed peptide binding by ELISA and by surface plasmon resonance. We also showed that the PAL-E antigen colocalizes with NRP-1 staining in endothelial cells. Crystal structure of the b1 domain in NRP-1 suggests that the PAL-E binding site overlaps with a vascular endothelial growth factor (VEGF) binding site. Taken together, these results indicate that NRP-1 is an endothelial cell antigen recognized by the true PAL-E antibody. The consistent biochemical, morphologic, and functional features between the PAL-E antigen and NRP-1 support our interpretation. Given that NRP-1 is a VEGF receptor, these results explain the attributes of the PAL-E antibody as a marker of vascular permeability and angiogenesis.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Jaalouk DE,Ozawa MG,Sun J,Lahdenranta J,Schlingemann RO,Pasqualini R,Arap Wdoi
10.1158/0008-5472.CAN-07-2737subject
Has Abstractpub_date
2007-10-15 00:00:00pages
9623-9issue
20eissn
0008-5472issn
1538-7445pii
67/20/9623journal_volume
67pub_type
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