Abstract
Endothelial cell derived nitric oxide (NO) inhibits the activation and aggregation of platelets. NO inhibition occurs through the intracellular receptor soluble guanylyl cyclase (sGC)-dependent pathways, but there is also evidence of sGC-independent pathways at high NO concentrations. In this study, we integrated a NO-releasing polymer into a microfluidic vascular injury model to measure the relative roles of sGC-dependent and sGC-independent pathways as a function of NO flux and shear rate. Whole blood was perfused at 200–1000 s−1 over collagen with NO wall fluxes of 0.4 and 6.8 × 10−10 mol cm−2 min−1, and 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ) was used to inhibit sGC. A sGC-independent pathway dominated inhibition of platelet aggregation at high NO flux, while the sGC-dependent pathway dominated at low NO flux independent of shear rate. Experiments performed with inhibitors of thrombin or an antagonist of the ADP receptor P2Y12 showed that platelet aggregation was primarily driven by ADP, but that the sGC-independent pathway dominated in both cases at high NO flux. These data suggest that a sGC-independent pathway may play an important role under conditions where NO flux is elevated such as inducible nitric oxide mediated NO production at the site of a vascular injury.
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Acknowledgments
This material is based upon work supported by the National Science Foundation under Grant No. CBET-1351672, the American Heart Association (10SDG2610066, K.B.N.) and Boettcher Foundation Webb-Waring Biomedical Research Awards (K.B.N., M.M.R.).
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JL.S., S.M.L, M.M.R. and K.B.N declare that they have no conflicts of interest.
Ethical Standards
All human subjects research was carried out in accordance with the Declaration of Helsinki and under the University of Colorado, Boulder Institutional Review Board approval. No animal studies were carried out by the authors for this article.
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Associate Editor Michael R. King oversaw the review of this article.
This paper is part of the 2014 Young Innovators Issue.
Keith B. Neeves is an assistant professor in Chemical and Biological Engineering at the Colorado School of Mines. He obtained his B.S. in chemical engineering from the University of Colorado, Boulder and a Ph.D. in chemical and biomolecular engineering at Cornell University. He was an NIH NRSA postdoctoral fellow at the University of Pennsylvania. His laboratory focuses on transport phenomena in biological tissues. His research has been recognized with a NSF CAREER award, a Scientist Development Grant from the American Heart Association, and Early Career Investigator Awards from the Boettcher Foundation Waring-Webb Biomedical Research Foundation and the Bayer Hemophilia Awards Program.
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Sylman, J.L., Lantvit, S.M., Reynolds, M.M. et al. The Relative Role of Soluble Guanylyl Cylase Dependent and Independent Pathways in Nitric Oxide Inhibition of Platelet Aggregation Under Flow. Cel. Mol. Bioeng. 7, 421–431 (2014). https://doi.org/10.1007/s12195-014-0331-1
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DOI: https://doi.org/10.1007/s12195-014-0331-1