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Published in: Basic Research in Cardiology 6/2008

01-11-2008 | ORIGINAL CONTRIBUTION

Impaired interaction of platelets with endothelial progenitor cells in patients with cardiovascular risk factors

Authors: Elisabeth Dernbach, Voahanginirina Randriamboavonjy, Ingrid Fleming, Andreas M. Zeiher, Stefanie Dimmeler, PhD, Carmen Urbich

Published in: Basic Research in Cardiology | Issue 6/2008

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Abstract

Objective

Recent studies indicate that platelets influence endothelial progenitor cell (EPC) recruitment to sites of vascular injury and promote their differentiation to an endothelial phenotype. Patients with cardiovascular risk factors (CVRF) demonstrate a reduced number and impaired function of EPC, as well as platelet hyper-reactivity. Therefore, we investigated the interaction of platelets and EPC from patients with CVRF.

Methods and results

Co-incubation of platelets and peripheral blood mononuclear cells, both from healthy volunteers, dose-dependently increased the number of adherent EPC. In contrast, patient-derived platelets failed to augment the number of adherent and migrating healthy and patient-derived EPC. However, co-incubation of platelets from healthy donors with mononuclear cells from patients with CVRF significantly enhanced the number of EPC, indicating that platelets from healthy volunteers are able to partially rescue the impairment of patient-derived EPC formation. Likewise, healthy donor-derived platelets augmented the impaired migration and clonal capacity of patient-derived EPC. Analysis of individual CVRF of platelet donors revealed that only diabetes mellitus inversely correlated with EPC number, colony formation and migration. The platelet supernatants from healthy volunteers that significantly increased EPC number contained IL-6, SDF-1, sCD40L and PDGF. While sCD40L and PDGF levels were comparable in platelet supernatants from healthy volunteers and patients with CVRF, the release of IL-6 and SDF-1 by patient-derived platelets was rather increased, thus, indicating that these soluble factors are not mediating the effect of platelet supernatants.

Conclusion

Healthy volunteer-derived platelets provide a source of soluble factors to improve the number and function of EPC from patients with cardiovascular risk factors, particularly diabetes mellitus.
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Metadata
Title
Impaired interaction of platelets with endothelial progenitor cells in patients with cardiovascular risk factors
Authors
Elisabeth Dernbach
Voahanginirina Randriamboavonjy
Ingrid Fleming
Andreas M. Zeiher
Stefanie Dimmeler, PhD
Carmen Urbich
Publication date
01-11-2008
Publisher
D. Steinkopff-Verlag
Published in
Basic Research in Cardiology / Issue 6/2008
Print ISSN: 0300-8428
Electronic ISSN: 1435-1803
DOI
https://doi.org/10.1007/s00395-008-0734-z

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