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Am J Physiol Heart Circ Physiol 280: H634-H641, 2001;
0363-6135/01 $5.00
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Vol. 280, Issue 2, H634-H641, February 2001

Selectin-independent leukocyte rolling and adhesion in mice deficient in E-, P-, and L-selectin and ICAM-1

S. Bradley Forlow and Klaus Ley

Department of Biomedical Engineering, University of Virginia School of Medicine, Charlottesville, Virginia 22908

To study selectin-independent leukocyte recruitment and the role of intercellular adhesion molecule-1 (ICAM-1), we generated mice lacking all three selectins and ICAM-1 (E/P/L/I-/-) by bone marrow transplantation. These mice were viable and appeared healthy under vivarium conditions, although they showed a 97% reduction in leukocyte rolling, a 63% reduction in leukocyte firm adhesion, and a 99% reduction of neutrophil recruitment in a thioglycollate-induced model of peritonitis at 4 and 24 h. Mononuclear cell recruitment was almost unaffected. All residual leukocyte rolling and most leukocyte adhesion in these mice depended on alpha 4-integrins, but a small number of leukocytes (6% of wild-type control) still became adherent in the absence of all known rolling mechanisms (E-, P-, L-selectin and alpha 4-integrins). A striking similarity of leukocyte adhesion efficiency in E/P/L-/- and E/P/I-/- mice suggests a pathway in which leukocyte rolling through L-selectin requires ICAM-1 for adhesion and recruitment. Comparison of our data with mice lacking individual or other combinations of adhesion molecules reveal that elimination of more adhesion molecules further reduces leukocyte recruitment but the effect is less than additive.

neutrophil adhesion; thioglycollate-induced peritonitis; intravital microscopy; knockout mice; alpha 4-integrins


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