Journal
JOURNAL OF THROMBOSIS AND HAEMOSTASIS
Volume 7, Issue 4, Pages 634-640Publisher
WILEY
DOI: 10.1111/j.1538-7836.2009.03307.x
Keywords
coagulation; Duffy antigen; endotoxin; MCP-1; tissue factor
Categories
Funding
- NHLBI NIH HHS [T32 HL007820-10] Funding Source: Medline
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Background: Racial differences in coagulation are poorly understood. While some studies suggest a 'prothrombotic' coagulation profile in blacks compared with whites, others report an increased bleeding risk for blacks in various clinical settings. Moreover, preclinical data suggest a link between the Duffy antigen (= DARC, Duffy antigen receptor of chemokines) and coagulation. Objectives: Based on our previous research in Duffy antigen negative Africans, we hypothesized that Africans have an attenuated procoagulant response compared with Caucasians in a model of lipopolysaccharide (LPS)-induced, tissue factor (TF)-triggered coagulation activation. Patients/methods: Healthy male volunteers (16 Duffy-negative Africans, 16 Duffy-positive Caucasians) received 2 ng kg(-1) LPS, and outcome parameters were measured using enzyme immunoassays and real-time polymerase chain reaction (RT-PCR, Taqman). Results: LPS increased microparticle (MP)-associated TF procoagulant activity (PCA) less in Africans than Caucasians. Africans had reduced in vivo thrombin formation compared with Caucasians: they generated less thrombin-antithrombin (TAT) complexes (10.4 pg mL(-1) vs. 23.0 pg mL(-1), P < 0.0001) and less prothrombin fragments (F1+2) (337 pmol mL(-1) vs. 819 pmol mL(-1), P < 0.0001). Consistently, Africans also had decreased fibrin formation (d-dimer: 0.3 pg mL(-1) vs. 0.5 pg mL(-1), P = 0.02). Conclusion: Duffy-negative subjects of African descent have a markedly reduced procoagulant response in a model of LPS-induced, TF-triggered coagulation activation compared with Duffy-positive healthy Caucasians.
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