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© The Rockefeller University Press, 0022-1007/1997/8/719/ $5.00
The Journal of Experimental Medicine, Volume 186, Number 5, August 29, 1997 719-730


Article

The Lymphocyte Function–associated Antigen 1 I Domain Is a Transient Binding Module for Intercellular Adhesion Molecule (ICAM)-1 and ICAM-3 in Hydrodynamic Flow

Ruth Knorr and Michael L. Dustin

From the Center for Immmunology and Department of Pathology, Washington University School of Medicine, St. Louis, MO 63110

The I domain of lymphocyte function–associated antigen (LFA)-1 contains an intercellular adhesion molecule (ICAM)-1 and ICAM-3 binding site, but the relationship of this site to regulated adhesion is unknown. To study the adhesive properties of the LFA-1 I domain, we stably expressed a GPI-anchored form of this I domain (I-GPI) on the surface of baby hamster kidney cells. I-GPI cells bound soluble ICAM-1 (sICAM-1) with a low avidity and affinity. Flow cell experiments demonstrated a specific rolling interaction of I-GPI cells on bilayers containing purified full length ICAM-1 or ICAM-3. The LFA-1 activating antibody MEM-83, or its Fab fragment, decreased the rolling velocity of I-GPI cells on ICAM-1–containing membranes. In contrast, the interaction of I-GPI cells with ICAM-3 was blocked by MEM-83. Rolling of I-GPI cells was dependent on the presence of Mg2+. Mn2+ only partially substituted for Mg2+, giving rise to a small fraction of rolling cells and increased rolling velocity. This suggests that the I domain acts as a transient, Mg2+-dependent binding module that cooperates with another Mn2+-stimulated site in LFA-1 to give rise to the stable interaction of intact LFA-1 with ICAM-1.


Address correspondence to Dr. Ruth Knorr or Dr. Michael L. Dustin, Center for Immunology and Department of Pathology, Box 8118, Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110.

1 Abbreviations used in this paper: BHK, baby hamster kidney; I-GPI, GPI anchored form of the LFA-1 I domain; ICAM, intercellular adhesion molecule; LFA, lymphocyte function–associated antigen; PIPLC, phosphatidylinositol-specific phospholipase C.

Portions of this work were previously presented at the meeting of the American Association for Immunologists (AAI) on 3-6 June 1996 in New Orleans, LA.


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