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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
C-reactive protein induces human peripheral blood monocytes to synthesize tissue factor.
Blood 1993 July 16
The acute inflammatory response is frequently accompanied by serious thrombotic events. We show that C-reactive protein (CRP), an acute-phase reactant that markedly increases its serum concentration in response to inflammatory stimuli, induced monocytes to express tissue factor (TF), a potent procoagulant. Purified human CRP in concentrations commonly achieved in vivo during inflammation (10 to 100 micrograms/mL) induced a 75-fold increase in TF procoagulant activity (PCA) of human peripheral blood mononuclear cells (PBM), with a parallel increase in TF antigen levels. CRP-induced PCA was completely blocked by a monoclonal antibody against human TF but not by irrelevant murine IgG. Dot blot analysis showed a significant increase of TF mRNA after 4 hours of incubation with CRP, followed by a peak of PCA within 6 and 8 hours. Actinomycin D and cycloheximide blocked CRP-stimulated PCA, suggesting that de novo TF protein synthesis was required. Endotoxin (LPS) contamination of CRP was excluded as the mediator of TF synthesis because: (1) CRP was Limulus assay negative; (2) induction of TF PCA by CRP was not blocked by Polymyxin B, in contrast to LPS-induced PCA; (3) antihuman CRP IgG inhibited CRP-induced PCA, but not LPS-induced PCA; (4) CRP was able to stimulate TF production in LPS-pretreated PBM refractory to additional LPS stimulation; and, (5) unlike LPS, CRP was incapable of inducing TF in human umbilical vein endothelial cells. We suggest that CRP-mediated TF production in monocytes may contribute to the development of disseminated intravascular coagulation and thrombosis in inflammatory states.
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