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Thrombin and its receptor enhance ST-segment elevation in acute myocardial infarction by activating the KATP channel

Ming Long1, Lei Yang, Genya Huang

  • 1Division of Cardiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.

Molecular Medicine (Cambridge, Mass.)
|April 14, 2010
PubMed

Insights

ST-segment elevation in acute myocardial infarction (AMI) is linked to thrombin activation. Thrombin receptor activator peptide (TRAP) opens ATP-sensitive K+ channels, causing ST elevation and shortening action potential duration in guinea pig hearts.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Pharmacology

Background:

  • ST-segment elevation is a key indicator for emergent coronary revascularization in chest pain patients.
  • The precise mechanism driving ST-segment elevation during acute myocardial infarction (AMI) remains largely unknown.

Purpose of the Study:

  • To investigate the role of thrombin and its receptor activation in ST-segment elevation during AMI.
  • To elucidate the specific ion channel mechanisms involved in thrombin-induced ST-segment changes.

Main Methods:

  • Utilized a guinea pig model of ST-segment elevation AMI.
  • Administered hirudin (thrombin antagonist) and thrombin receptor activator peptide (TRAP).
  • Investigated the effects of glibenclamide, HMR1098, 5HD, and pinacidil on ST-segment elevation and action potential duration; performed single-channel recordings of KATP channels.

Main Results:

  • Hirudin dose-dependently reduced AMI-induced ST-segment elevation, an effect reversed by TRAP.
  • TRAP alone induced ST-segment elevation, shortened action potential duration, and activated ATP-sensitive K+ (KATP) channels.
  • TRAP-induced effects were blocked by glibenclamide and HMR1098, and partially by 5HD; pinacidil mimicked TRAP's effects.
  • TRAP-induced KATP channel activity was blocked by HMR1098.

Conclusions:

  • Thrombin receptor activation significantly contributes to ST-segment elevation in AMI.
  • The sarcolemmal KATP channel is a key mediator of thrombin-induced ST-segment elevation.
  • Targeting thrombin signaling pathways may offer novel therapeutic strategies for managing AMI-related ST-segment changes.

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