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An Antithrombotic Agent, NQ301, Inhibits Thromboxane A2 Receptor and Synthase Activity in Rabbit Platelets

An Antithrombotic Agent, NQ301, Inhibits Thromboxane A2 Receptor and Synthase Activity in Rabbit Platelets

Yong-Ri Jin, Mi-Ra Cho, Kyung-Sup Lee, Jung-Jin Lee, Yong Lim, Xiang-Hua Han, Ki-Wan Oh, Jin-Tae Hong, Hwan-Soo Yoo, Yeo-Pyo Yun

Basic Clin Pharmacol Toxicol. 2005 Sep;97(3):162-7.

PMID: 16128910

Abstract:

In previous studies we have reported that NQ301, a synthetic 1,4-naphthoquinone derivative, displays a potent antithrombotic activity, and that this might be due to antiplatelet effect, which was mediated by the inhibition of cytosolic Ca(2+) mobilization in activated platelets. In the present study, the effect of NQ301 on arachidonic acid cascade in activated platelets has been examined. NQ301 concentration-dependently inhibited washed rabbit platelet aggregation induced by collagen (10 microg/ml), arachidonic acid (100 microM) and U46619 (1 microM), a thromboxane A2 receptor agonist, with IC50 values of 0.60+/-0.02, 0.78+/-0.04 and 0.58+/-0.04 microM, respectively. NQ301 also produced a shift to the right of the concentration-effect curve of U46619, indicating a competitive type of antagonism on thromboxane A2/prostaglandin H2 receptor. NQ301 slightly inhibited collagen-induced arachidonic acid liberation. In addition, NQ301 potently suppressed thromboxane B2 formation by platelets that were exposed to arachidonic acid in a concentration-dependent manner, but had no effect on the production of prostaglandin D2, indicating an inhibitory effect on thromboxane A2 synthase. This was supported by thromboxane A2 synthase activity assay that NQ301 concentration-dependently inhibited thromboxane B2 formation converted from prostaglandin H2. Moreover, NQ301 concentration-dependently inhibited 12-hydroxy-5,8,10,14-eicosatetraenoic acid formation by platelets that were exposed to arachidonic acid. Taken together, these results suggest that NQ301 has a potential to inhibit thromboxane A2 synthase activity with thromboxane A2/prostaglandin H2 receptor blockade, and modulate arachidonic acid liberation as well as 12-hydroxy-5,8,10,14-eicosatetraenoic acid formation in platelets. This may also be a convincing mechanism for the antithrombotic action of NQ301.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP130089984	NQ301		130089-98-4	Price

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