A human blood-brain barrier transcytosis assay reveals antibody transcytosis influenced by pH-dependent receptor binding

We have adapted an in vitro model of the human blood-brain barrier, the immortalized human cerebral microvascular endothelial cells (hCMEC/D3), to quantitatively measure protein transcytosis. After validating the receptor-mediated transport using transferrin, the system was used to measure transcyto...

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Veröffentlicht in:PloS one 2014-04, Vol.9 (4), p.e96340-e96340
Hauptverfasser: Sade, Hadassah, Baumgartner, Claudia, Hugenmatter, Adrian, Moessner, Ekkehard, Freskgård, Per-Ola, Niewoehner, Jens
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container_issue 4
container_start_page e96340
container_title PloS one
container_volume 9
creator Sade, Hadassah
Baumgartner, Claudia
Hugenmatter, Adrian
Moessner, Ekkehard
Freskgård, Per-Ola
Niewoehner, Jens
description We have adapted an in vitro model of the human blood-brain barrier, the immortalized human cerebral microvascular endothelial cells (hCMEC/D3), to quantitatively measure protein transcytosis. After validating the receptor-mediated transport using transferrin, the system was used to measure transcytosis rates of antibodies directed against potential brain shuttle receptors. While an antibody to the insulin-like growth factor 1 receptor (IGF1R) was exclusively recycled to the apical compartment, the fate of antibodies to the transferrin receptor (TfR) was determined by their relative affinities at extracellular and endosomal pH. An antibody with reduced affinity at pH5.5 showed significant transcytosis, while pH-independent antibodies of comparable affinities at pH 7.4 remained associated with intracellular vesicular compartments and were finally targeted for degradation.
doi_str_mv 10.1371/journal.pone.0096340
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After validating the receptor-mediated transport using transferrin, the system was used to measure transcytosis rates of antibodies directed against potential brain shuttle receptors. While an antibody to the insulin-like growth factor 1 receptor (IGF1R) was exclusively recycled to the apical compartment, the fate of antibodies to the transferrin receptor (TfR) was determined by their relative affinities at extracellular and endosomal pH. An antibody with reduced affinity at pH5.5 showed significant transcytosis, while pH-independent antibodies of comparable affinities at pH 7.4 remained associated with intracellular vesicular compartments and were finally targeted for degradation.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0096340</identifier><identifier>PMID: 24788759</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Affinity ; Analysis ; Antibodies ; Antibodies - immunology ; Antibodies - metabolism ; Antigens, CD - immunology ; Biology and Life Sciences ; Blood-brain barrier ; Blood-Brain Barrier - metabolism ; Brain research ; Cell Line ; Chemical properties ; Compartments ; Crystal structure ; Endocytosis ; Endothelial cells ; Health aspects ; Humans ; Hydrogen ions ; Hydrogen-Ion Concentration ; Immunoglobulins ; Insulin ; Insulin-like growth factors ; Ligands ; Medicine and Health Sciences ; Microvasculature ; pH effects ; Proteins ; Receptor, IGF Type 1 - immunology ; Receptors ; Receptors, Transferrin - immunology ; Rodents ; Transcytosis ; Transferrin ; Viral antibodies</subject><ispartof>PloS one, 2014-04, Vol.9 (4), p.e96340-e96340</ispartof><rights>COPYRIGHT 2014 Public Library of Science</rights><rights>2014 Sade et al. 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subjects Affinity
Analysis
Antibodies
Antibodies - immunology
Antibodies - metabolism
Antigens, CD - immunology
Biology and Life Sciences
Blood-brain barrier
Blood-Brain Barrier - metabolism
Brain research
Cell Line
Chemical properties
Compartments
Crystal structure
Endocytosis
Endothelial cells
Health aspects
Humans
Hydrogen ions
Hydrogen-Ion Concentration
Immunoglobulins
Insulin
Insulin-like growth factors
Ligands
Medicine and Health Sciences
Microvasculature
pH effects
Proteins
Receptor, IGF Type 1 - immunology
Receptors
Receptors, Transferrin - immunology
Rodents
Transcytosis
Transferrin
Viral antibodies
title A human blood-brain barrier transcytosis assay reveals antibody transcytosis influenced by pH-dependent receptor binding
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