Ruthenium-conjugated chrysin analogues modulate platelet activity, thrombus formation and haemostasis with enhanced efficacy

Ravishankar, D., Salamah, M., Attina, A., Pothi, R., Vallance, T. M., Javed, M., Williams, H. F., Alzahrani, E. M. S., Kabova, E., Vaiyapuri, R., Shankland, K. ORCID: https://orcid.org/0000-0001-6566-0155, Gibbins, J. ORCID: https://orcid.org/0000-0002-0372-5352, Strohfeldt, K., Greco, F., Osborn, H. M. I. ORCID: https://orcid.org/0000-0002-0683-0457 and Vaiyapuri, S. ORCID: https://orcid.org/0000-0002-6006-6517 (2017) Ruthenium-conjugated chrysin analogues modulate platelet activity, thrombus formation and haemostasis with enhanced efficacy. Scientific Reports, 7. 5738. ISSN 2045-2322 doi: 10.1038/s41598-017-05936-3

Abstract/Summary

The constant increase in cardiovascular disease rate coupled with significant drawbacks of existing therapies emphasise the necessity to improve therapeutic strategies. Natural flavonoids exert innumerable pharmacological effects in humans. Here, we demonstrate the effects of chrysin, a natural flavonoid found largely in honey and passionflower on the modulation of platelet function, haemostasis and thrombosis. Chrysin displayed significant inhibitory effects on isolated platelets, however, its activity was substantially reduced under physiological conditions. In order to increase the efficacy of chrysin, a sulfur derivative (thio-chrysin), and ruthenium-complexes (Ru-chrysin and Ru-thio-chrysin) were synthesised and their effects on the modulation of platelet function were evaluated. Indeed, Ru-thio-chrysin displayed a 4-fold greater inhibition of platelet function and thrombus formation in vitro than chrysin under physiologically relevant conditions such as in platelet-rich plasma and whole blood. Notably, Ru-thio-chrysin exhibited similar efficacy to chrysin in the modulation of haemostasis in mice. Increased bioavailability and cell permeability of Ru-thio-chrysin compared to chrysin were found to be the basis for its enhanced activity. Together, these results demonstrate that Ru-thio-coupled natural compounds such as chrysin may serve as promising templates for the development of novel anti-thrombotic agents.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/70718
Item Type	Article
Refereed	Yes
Divisions	Interdisciplinary centres and themes > Institute for Cardiovascular and Metabolic Research (ICMR) Life Sciences > School of Biological Sciences > Biomedical Sciences Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Mass Spectrometry (CAF) Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > NMR (CAF) Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Xray (CAF) University of Reading Malaysia Life Sciences > School of Chemistry, Food and Pharmacy > School of Pharmacy > Medicinal Chemistry Research Group Life Sciences > School of Chemistry, Food and Pharmacy > School of Pharmacy > Division of Pharmacology Life Sciences > School of Chemistry, Food and Pharmacy > School of Pharmacy > Pharmaceutics Research Group
Publisher	Nature Publishing Group
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