Honokiol As a Specific Collagen Receptor Glycoprotein VI Antagonist on Human Platelets: Functional Ex Vivo and in Vivo Studies

Overview

Journal Sci Rep

Specialty Science

Date 2017 Jan 6

PMID 28054640

Citations 7

Authors

Tzu-Yin Lee

Chao-Chien Chang

Wan-Jung Lu

Ting-Lin Yen

Kuan-Hung Lin

Pitchairaj Geraldine

Jiun-Yi Li

Joen-Rong Sheu

Affiliations

Soon will be listed here.

Abstract

Honokiol, derived from Magnolia officinalis, has various pharmacological properties. Platelet activation plays a critical role in cardiovascular diseases. Honokiol has been reported to inhibit collagen-stimulated rabbit platelet aggregation. However, detailed further studies on the characteristics and functional activity of honokiol in platelet activation are relatively lacking. In the present study, honokiol specifically inhibited platelet aggregation and Ca ion mobilization stimulated with collagen or convulxin, an agonist of glycoprotein (GP) VI, but not with aggretin, an agonist of integrin αβ. Honokiol also attenuated the phosphorylation of Lyn, PLCγ2, PKC, MAPKs, and Akt after convulxin stimulation. Honokiol have no cytotoxicity in zebrafish embryos. Honokiol diminished the binding of anti-GP VI (FITC-JAQ1) mAb to human platelets, and it also reduced the coimmunoprecipitation of GP VI-bound Lyn after convulxin stimulation. The surface plasmon resonance results revealed that honokiol binds directly to GP VI, with a K of 289 μM. Platelet function analysis revealed that honokiol substantially prolonged the closure time in human whole blood and increased the occlusion time of thrombotic platelet plug formation in mice. In conclusion, honokiol acts as a potent antagonist of collagen GP VI in human platelets, and it has therapeutic potential in the prevention of the pathological thrombosis.

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