Two-step Model of Leukocyte-endothelial Cell Interaction in Inflammation: Distinct Roles for LECAM-1 and the Leukocyte Beta 2 Integrins in Vivo

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1991 Sep 1

PMID 1715568

Citations 231

Authors

U H von Andrian

J D Chambers

L M McEvoy

R F Bargatze

K E Arfors

E C Butcher

Affiliations

Soon will be listed here.

Abstract

The lectin homing receptor LECAM-1 (LAM-1, Leu8) and the beta 2 integrins, particularly Mac-1 (CD11b/CD18), participate in leukocyte-endothelial cell interactions in inflammation. LECAM-1 is rapidly shed while Mac-1 expression is dramatically increased upon neutrophil activation, suggesting functionally distinct roles for these molecules. Using intravital video microscopy, we have compared the effect of antibodies against LECAM-1 and CD18 on leukocyte interactions with rabbit mesenteric venules. Anti-LECAM-1 monoclonal antibody and its Fab fragments inhibited initial reversible leukocyte rolling along the vascular wall. Anti-CD18 monoclonal antibody had no effect on rolling but prevented subsequent firm attachment of leukocytes to venular endothelium. These results support a two-step model of leukocyte-endothelial cell interactions: reversible rolling mediated in part by LECAM-1 facilitates leukocyte recruitment by the local microenvironment and precedes activation-dependent firm attachment involving beta 2 integrins.

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