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(Investigative Ophthalmology and Visual Science. 2001;42:2563-2566.)
© 2001 by The Association for Research in Vision and Ophthalmology, Inc.

Inhibition of Leukocyte Sticking and Infiltration, but Not Rolling, by Antibodies to ICAM-1 and LFA-1 in Murine Endotoxin–Induced Uveitis

Matthias D. Becker1,2, Kiera Garman1, Scott M. Whitcup3, Stephen R. Planck1,4,5 and James T. Rosenbaum1,4,5

1 From the Casey Eye Institute and the 4 Departments of Medicine and 5 Cell and Developmental Biology, Oregon Health & Science University, Portland, Oregon; and 3 National Eye Institute, Bethesda, Maryland.

PURPOSE. Cell-adhesion molecules are critical elements in intravascular rolling and sticking of leukocytes during acute inflammation. In this process, selectins are thought to be involved in initial adhesion and rolling, and integrin–Ig superfamily interactions are believed primarily to mediate stronger adhesion and transendothelial migration. This study clarifies the role of two adhesion molecules, intercellular adhesion molecule (ICAM)-1 and leukocyte functional antigen (LFA)-1, in endotoxin-induced uveitis (EIU).

METHODS. Intravital microscopy was used to record the movement and location of leukocytes in the irises of mice with uveitis induced by intravitreal injection of 250 ng Escherichia coli endotoxin. Each mouse concurrently received an intraperitoneal injection of monoclonal neutralizing antibodies for ICAM-1, LFA-1, or both or control irrelevant antibodies.

RESULTS. Mice treated with endotoxin and control antibodies had an inflammatory response that was clearly present at the 6- and 24-hour time points and was mostly resolved by 48 hours. Mice that received anti-ICAM-1 or anti-LFA-1 had significantly fewer cells infiltrating their irises at 6 and 24 hours. Detailed analysis of the 6-hour time point recordings revealed that neither anti-ICAM-1 nor anti-LFA-1 significantly reduced the number of leukocytes rolling on venule endothelial surfaces, but the treatments reduced the number of firmly adherent cells.

CONCLUSIONS. These data confirm previous reports that ICAM-1 and LFA-1 are important mediators of EIU. The dynamic in vivo images clearly support the hypothesis that integrin-mediated cell adhesion is more critical for the firm adhesion of sticking cells than for leukocyte rolling.




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