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Hydroxyls on the B ring and gallic acyl are essential for catechins to restrain ADP-induced thrombosis

Yani Pan1, Xinyu Feng1,2, Su Zhou1,2

  • 1Tea Research Institute, Zhejiang University, Hangzhou 310058, China. 0619363@zju.edu.cn.

Food & Function
|December 23, 2022
PubMed

Insights

Tea compounds called catechins can prevent blood clots by inhibiting platelet aggregation. Specific structures, like gallic acyl groups, are key to this antithrombotic effect, offering potential for cardiovascular disease prevention.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Cardiovascular Research

Background:

  • Platelet hyperactivation is linked to cardiovascular and cerebrovascular diseases.
  • Long-term tea consumption is associated with reduced cardiovascular disease risk.
  • Catechins, particularly epigallocatechin gallate (EGCG), show potential in alleviating thrombosis by inhibiting platelet aggregation.

Purpose of the Study:

  • To investigate the structure-activity relationship of six typical catechins concerning their anti-platelet aggregation effects.
  • To explore the underlying mechanisms of how different catechin structures inhibit platelet activation.
  • To identify key functional groups responsible for the antithrombotic activity of catechins.

Main Methods:

  • Construction of platelet activation models using various inducers.
  • Utilized techniques including flow cytometry, immunoblotting, and cell spreading assays.
  • Evaluated the inhibitory effects of catechins with distinct structural features on platelet aggregation.

Main Results:

  • Ester catechins demonstrated inhibition of adenosine diphosphate (ADP)-induced platelet aggregation.
  • Epigallocatechin (EGC), a non-ester catechin with three hydroxyls on the B ring, also effectively inhibited platelet aggregation.
  • Gallic acyl groups on the C ring and three hydroxyls on the B ring were identified as crucial functional groups for antithrombotic effects, with gallic acyl showing a stronger impact than hydroxyl groups.

Conclusions:

  • Specific structural features of catechins, namely gallic acyl on the C ring and multiple hydroxyls on the B ring, are critical for their ability to inhibit platelet aggregation.
  • The gallic acyl moiety exhibits a more potent effect on platelet inhibition compared to hydroxyl groups.
  • These findings elucidate the structure-activity relationship of catechins, providing insights into their therapeutic potential for cardiovascular diseases.

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