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Mol Nutr Food Res. 2014 Apr;58(4):698-708. doi: 10.1002/mnfr.201300267. Epub 2013 Dec 16.

Phloretin suppresses thrombin-mediated leukocyte-platelet-endothelial interactions.

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  • 1Department of Food and Nutrition, Hallym University, Chuncheon, Republic of Korea.

Abstract

SCOPE:

Thrombin playing a pivotal role in coagulation cascade may influence the onset and progression of atherosclerosis as a pro-inflammatory mediator. This study investigated whether phloretin found in apple tree leaves, severed a linkage between thrombosis and atherosclerosis by thrombin.

METHODS AND RESULTS:

Human endothelial cells were pre-treated with 1-20 μM phloretin and stimulated with 10 U/mL thrombin. Phloretin attenuated adhesion of THP-1 monocytes and platelets to thrombin-inflamed endothelial cells with concurrent inhibition of protease-activated receptor (PAR-1) induction. The thrombin induction of endothelial CD40, endothelial integrin β3 and P-selectin, and monocytic CD40L was dampened by phloretin. Additionally, phloretin inhibited monocyte secretion of MCP-1, IL-6 and IL-8 responsible for pro-inflammatory activity of thrombin inducing endothelial CD40. The monocyte COX-2 induction and PGE2 secretion due to thrombin were down-regulated by phloretin, deterring endothelial CD40 expression. Thrombin promoted production of PAI-1 and tissue factor in monocytes was attenuated by phloretin through blocking PAR-1 and CD40. Thrombin up-regulated the induction of endothelial connective tissue growth factor independent of PAR-1 activation, which was reversed by phloretin.

CONCLUSION:

Phloretin disturbed tethering and stable adhesion of monocytes and platelets onto endothelium during increased thrombosis by thrombin. Phloretin would be a potent agent preventing thrombosis and atherosclerosis.

© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

KEYWORDS:

CD40; Phloretin; Platelet; Protease-activated receptor-1; Thrombin

PMID:
24338998
[PubMed - in process]
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