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J. Cell Biol.,
Volume 142, Number 2, July 27, 1998 595-607
v
3 Integrin in
the Transmigration of Monocytes



* Basel Institute for Immunology, CH-4005 Basel, Switzerland; The In conclusion, we show that
Department of Pathology, and § Department of Internal
Medicine, Washington University Medical Centre, St. Louis, Missouri 63110; and
Department of Pathology, Centre Médical
Universitaire, CH-1211 Geneva, Switzerland
2 integrins and intercellular adhesion
molecule-1 (ICAM-1) are important for monocyte migration through inflammatory endothelium. Here we
demonstrate that the integrin
v
3 is also a key player
in this process. In an in vitro transendothelial migration
assay, monocytes lacking
3 integrins revealed weak migratory ability, whereas monocytes expressing
3 integrins engaged in stronger migration. This migration
could be partially blocked by antibodies against the integrin chains
L,
2,
v, or IAP, a protein functionally
associated with
v
3 integrin. Transfection of
3 integrin chain cDNA into monocytes lacking
3 integrins resulted in expression of the
v
3 integrin and conferred on these cells an enhanced ability to transmigrate through cell monolayers expressing ICAM-1.
These monocytes also engaged in
L
2-dependent locomotion on recombinant ICAM-1 which was enhanced by
v
3 integrin occupancy. Antibodies against
IAP were able to revert this
v
3 integrin-dependent
cell locomotion to control levels. Finally, adhesion assays revealed that occupancy of
v
3 integrin could decrease monocyte binding to ICAM-1.
v
3 integrin modulates
L
2 integrin-dependent monocyte adhesion to and migration on ICAM-1. This could represent a novel mechanism to promote monocyte motility on vascular ICAM-1
and initiate subsequent transendothelial migration.
v
3 integrin;
L
2 integrin;
migration;
ICAM-1
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