Planta Med 2011; 77(17): 1898-1904
DOI: 10.1055/s-0031-1280008
Biological and Pharmacological Activity
Original Papers
© Georg Thieme Verlag KG Stuttgart · New York

Protocatechualdehyde Synergizes with Aspirin at the Platelet Cyclooxygenase-1 Level

Shiqing Sun1 , Haiping Hao1 , Ping Gong1 , Zhiyuan Tang1 , Feiyan Li1 , Xiaohu Chen2 , Haibo Shi2 , Guangji Wang1
  • 1Key Lab of Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, Nanjing, China
  • 2Department of Cardiology, Jiangsu Provincial Hospital of Traditional Chinese Medicine, Nanjing, China
Further Information

Publication History

received February 19, 2011 revised May 16, 2011

accepted May 26, 2011

Publication Date:
04 July 2011 (online)

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Abstract

Polyphenol-aspirin interactions were recently identified; however, the interaction mode and underlying mechanisms remained elusive. Here, we quantitatively assessed the potential interactions among two important polyphenolic compounds, caffeic acid (CA) and protocatechualdehyde (Pro), and aspirin in the AA-induced platelet aggregation model by applying the isobologram and universal response surface approach (URSA) methods. A molecular docking approach and an originally developed platelet-associated aspirin clearance approach (PAACA) were then applied to explore the potential interaction mechanisms. Although Pro and CA themselves exhibited weak inhibitory effect on arachidonic acid (AA)-induced platelet aggregation and the production of thromboxane B2 (TXB2), both Pro and CA potentiated aspirin action in a synergistic manner. The most prominent synergism was found between Pro and aspirin. Pro formed a stable complex into the cyclooxygenase-1 (COX-1) channel by in silico docking and significantly promoted the platelet-associated aspirin clearance, suggesting that the Pro interaction with COX-1 was favorable to the binding of aspirin with COX-1. Taken together, our findings suggest that the capacity of Pro and potentially other structurally similar polyphenolic compounds on promoting the binding of aspirin on platelet COX-1 might be the main mechanism of their synergism with aspirin.

Supporting Information

References

Dr. Haiping Hao

Key Laboratory of Drug Metabolism and Pharmacokinetics
China Pharmaceutical University

Tongjiaxiang 24

Nanjing 210009

China

Phone: +86 25 83 27 11 79

Fax: +86 25 83 27 10 60

Email: hhp_770505@yahoo.com.cn

Prof. Guangji Wang

Key Laboratory of Drug Metabolism and Pharmacokinetics
China Pharmaceutical University

Tongjiaxiang 24

Nanjing 210009

China

Phone: +86 25 83 27 11 28

Fax: +86 25 83 30 28 27

Email: guangjiwang@hotmail.com