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Proc Natl Acad Sci U S A. 2003 Jun 10;100(12):7231-4. Epub 2003 Jun 2.

Microangiectasias: structural regulators of lymphocyte transmigration.

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Department of Physiology, University of Arizona, Tucson, AZ 85724, USA.


The migration of lymphocytes into inflammatory tissue requires the migrating cell to overcome mechanical forces produced by blood flow. A generally accepted hypothesis is that these forces are overcome by a multistep sequence of adhesive interactions between lymphocytes and endothelial cells. This hypothesis has been recently challenged by results demonstrating wall shear stress on the order of 20 dyn/cm(2) in vivo and infrequent lymphocyte-endothelial adhesion at wall shear stress >1-2 dyn/cm(2) in vitro. Here, we show that lymphocyte slowing and transmigration in the skin is associated with microangiectasias, i.e., focal structural dilatations of microvessel segments. Microangiectasias are inducible within 4 days of the onset of inflammation and lead to a greater than 10-fold local reduction in wall shear stress. These findings support the hypothesis that a preparatory step to lymphocyte transmigration involves structural adaptations in the inflammatory microcirculation.

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