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The Journal of Immunology, Vol 155, Issue 2 529-532, Copyright © 1995 by American Association of Immunologists
CUTTING EDGE |
PL Reilly, JR Woska Jr, DD Jeanfavre, E McNally, R Rothlein and BJ Bormann
Department of Immunologic Disease, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, CT 06877, USA.
In solution, intercellular adhesion molecule-1 (ICAM-1) exhibits extremely low affinity for its receptor, LFA-1, as direct binding to LFA-1 has not been reported. Furthermore, there are conflicting reports on the ability of ICAM-1 in solution to inhibit cell adhesion events. These differences could be due to the valency or an oligomeric native biochemical form of membrane-bound and soluble ICAM-1, which may correlate with its ability to bind to integrins. To test this, stimulated adenocarcinoma (A549) cells or HUVEC were labeled with 35S- methionine/cysteine and treated with a chemical cross-linker. A high m.w. form (200 kDa) of ICAM-1 but not ICAM-2 was specifically immunoprecipitated from cross-linked cell lysates and supernatants. Affinity purification of crosslinked supernatants revealed that the majority of ICAM-1 was dimeric as opposed to recombinant soluble ICAM- 1, which contains a minor fraction of dimer. Gel filtration chromatography was used to isolate monomeric and dimer-rich fractions of recombinant soluble ICAM-1, and tested for direct binding to affinity-purified LFA-1. Dimer-rich fractions demonstrated an enhanced ability and estimated affinity, compared with monomeric protein, to bind to purified LFA-1. These data suggest that ICAM-1 exists in its native membrane-bound and shed form as a non-covalent dimer, and that dimerization directly correlates with enhanced binding to LFA-1.
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