Binding of fibrinogen to human monocytes

D. C. Altieri, P. M. Mannucci, A. M. Capitanio

Research output: Contribution to journalArticlepeer-review

Abstract

The interaction of fibrinogen with monocytes was studied. After stimulation with ADP (10 μM) or thrombin (1 U/ml), platelet-free suspensions of human monocytes bind 125I-fibrinogen with two different affinities in a specific and Ca2+-dependent reaction with saturation at 5.80-7.35 x 10-7 M of added protein. The binding of fibrinogen to specific receptors on monocytes induces the procoagulant activity of these cells. Thrombasthenic cells or normal monocytes preincubated with a monoclonal antibody to the platelet glycoprotein IIb/IIIa complex (10E5) do not bind fibrinogen and have no procoagulant activity. Metabolic studies with [35S]methionine revealed that cultured monocytes actually synthesize a surface antigen precipitated by 10E5 antibody as a major band with 92,000 relative molecular weight. Our data indicate that monocytes express receptors for fibrinogen only in part related to the platelet glycoprotein IIb/IIIa complex. Furthermore, the binding of fibrinogen to monocytes enhances the cooperation of these cells in hemostasis.

Original languageEnglish
Pages (from-to)968-976
Number of pages9
JournalJournal of Clinical Investigation
Volume78
Issue number4
Publication statusPublished - 1986

ASJC Scopus subject areas

  • Medicine(all)

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