Please use this identifier to cite or link to this item: https://doi.org/10.1371/journal.pone.0169537
Title: Mechanism of collaborative enhancement of binding of paired antibodies to distinct epitopes of platelet endothelial cell adhesion molecule-1
Authors: Kiseleva R.
Greineder C.F.
Villa C.H.
Hood E.D.
Shuvaev V.V.
Sun J.
Chacko A.-M. 
Abraham V.
DeLisser H.M.
Muzykantov V.R.
Keywords: CD31 antigen
cell adhesion molecule
epitope
iodine 125
monoclonal antibody
recombinant antigen
recombinant PECAM 1 antigen
unclassified drug
CD31 antigen
epitope
monoclonal antibody
animal cell
animal experiment
antigen binding
Article
binding affinity
binding site
cell function
cell interaction
cell membrane
collaborative enhancement effect
controlled study
gene expression
gene interaction
human
human cell
isotope labeling
ligand binding
mouse
mutant
nonhuman
PECAM1 gene
protein conformation
protein folding
sequence alignment
sequence analysis
signal transduction
animal
cell adhesion
cell culture
immunology
lung tumor
mesothelioma
metabolism
pathology
vascular endothelium
Animals
Antibodies, Monoclonal
Antigens, CD31
Cell Adhesion
Cell Membrane
Cells, Cultured
Endothelium, Vascular
Epitopes
Humans
Lung Neoplasms
Mesothelioma
Mice
Issue Date: 2017
Citation: Kiseleva R., Greineder C.F., Villa C.H., Hood E.D., Shuvaev V.V., Sun J., Chacko A.-M., Abraham V., DeLisser H.M., Muzykantov V.R. (2017). Mechanism of collaborative enhancement of binding of paired antibodies to distinct epitopes of platelet endothelial cell adhesion molecule-1. PLoS ONE 12 (1) : e0169537. ScholarBank@NUS Repository. https://doi.org/10.1371/journal.pone.0169537
Rights: Attribution 4.0 International
Abstract: Monoclonal antibodies (mAbs) directed to extracellular epitopes of human and mouse Platelet Endothelial Cell Adhesion Molecule-1 (CD31 or PECAM-1) stimulate binding of other mAbs to distinct adjacent PECAM-1 epitopes. This effect, dubbed Collaborative Enhancement of Paired Affinity Ligands, or CEPAL, has been shown to enhance delivery of mAb-targeted drugs and nanoparticles to the vascular endothelium. Here we report new insights into the mechanism underlying this effect, which demonstrates equivalent amplitude in the following models: i) cells expressing a full length PECAM-1 and mutant form of PECAM-1 unable to form homodimers; ii) isolated fractions of cellular membranes; and, iii) immobilized recombinant PECAM-1. These results indicate that CEPAL is mediated not by interference in cellular functions or homophilic PECAM-1 interactions, but rather by conformational changes within the cell adhesion molecule induced by ligand binding. This mechanism, mediated by exposure of partially occult epitopes, is likely to occur in molecules other than PECAM-1 and may represent a generalizable phenomenon with valuable practical applications. © 2017 Kiseleva et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Source Title: PLoS ONE
URI: https://scholarbank.nus.edu.sg/handle/10635/161538
ISSN: 19326203
DOI: 10.1371/journal.pone.0169537
Rights: Attribution 4.0 International
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