0593. Reelin mediates the human neutrophil peptide-induced endothelial dysfunction and platelet aggregation
© Luo et al; licensee Springer. 2014
Published: 26 September 2014
Atherosclerosis is an inflammatory disease with fundamental primitive events including endothelial dysfunction and platelet aggregation . Human neutrophil peptides (HNP) are the most abundant cationic proteins in neutrophils and are released into the extracellular milieu upon activation . HNP have previously been detected in atherosclerotic lesions, and are in high concentrations in blood of patients with acute coronary syndrome . We have previously demonstrated that HNP can induce foam cell formation, platelet aggregation and leukocyte recruitment through the LRP8 signaling pathway , but there is no direct interaction between HNP and LRP8.
We examined if HNP-induced endothelial dysfunction and platelet aggregation through the LRP8-signaling pathway is mediated by the LRP ligand reelin.
Human coronary artery endothelial cells (HCAEC) were stimulated with HNP or recombinant reelin (rRLN) to assess reelin protein expression and release, and endothelial and inducible nitric oxide synthase (eNOS and iNOS, respectively) protein expression, respectively. Human platelet-rich plasma (PRP) was primed with ADP, followed by stimulation with vehicle control, or HNP in the presence or absence of rRLN. Platelet activation and aggregation were determined by flow cytometry and Chronolog Aggregometer, respectively. The specificity of reelin-induced responses in HCAEC and PRP were confirmed by using a reelin neutralizing antibody (CR50).
HNP-induced endothelial dysfunction, platelet activation and aggregation were mediated by the LRP8-ligand, reelin. Blocking reelin maybe a potential therapeutic target in atherosclerosis.
Canadian Institute of Health Research
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