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. 1991 Oct;88(4):1128–1134. doi: 10.1172/JCI115412

Ligand bridging mediates integrin alpha IIb beta 3 (platelet GPIIB-IIIA) dependent homotypic and heterotypic cell-cell interactions.

M P Gawaz 1, J C Loftus 1, M L Bajt 1, M M Frojmovic 1, E F Plow 1, M H Ginsberg 1
PMCID: PMC295567  PMID: 1918367

Abstract

The aggregation of cells bearing recombinant integrin alpha IIb beta 3 (platelet GPIIb-IIIa) has been analyzed by two-color flow cytometry. As in normal platelets, aggregation requires functional alpha IIb beta 3, "activation" of alpha IIb beta 3, and fibrinogen (fg) binding to alpha IIb beta 3. Cellular aggregation required that both interacting cells express functional alpha IIb beta 3, because a binding defective mutant, alpha IIb beta 3 (D119----Y), failed to support interaction with wild type alpha IIb beta 3-bearing cells. In addition, cells bearing resting alpha IIb beta 3 were incorporated into aggregates formed by cells bearing a constitutively active mutant, alpha IIb beta 3 (beta 1-2), indicating that only one of the cells in an interacting pair must be activated. Finally, heterotypic interactions occurred between cells bearing activated alpha IIb beta 3 and cells bearing alpha V beta 3, a fg-binding integrin present on endothelial and tumor cells. Thus, ligand bridging between fg-binding integrins represents a mechanism of cell-cell interaction, cells bearing resting alpha IIb beta 3 (e.g., resting platelets) may be incorporated into aggregates formed by cells bearing activated alpha IIb beta 3, and alpha IIb beta 3 mediates heterotypic interactions with cells bearing other fg receptors.

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