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Related Experiment Videos

Protection of thrombin receptor expression under hypoxia.

E Landau1, R Tirosh, A Pinson

  • 1Department of Oncology, Hadassah-University Hospital, Jerusalem 91120, Israel.

The Journal of Biological Chemistry
|January 25, 2000
PubMed
Summary

Activating the thrombin receptor (ThR) protects its messenger RNA (mRNA) from decay during hypoxic stress in heart cells. This ThR activation offers a potential repair mechanism for ischemic heart tissue.

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Area of Science:

  • Cardiovascular Biology
  • Molecular Cardiology
  • Cellular Stress Response

Background:

  • Thrombin receptor (ThR) is crucial for myocyte contractility and hypertrophy.
  • Ischemic heart damage from reduced blood supply is a primary cause of myocardial infarction.
  • Hypoxic stress significantly reduces ThR mRNA levels in heart myocytes.

Purpose of the Study:

  • To investigate the role of ThR in protecting heart myocytes against hypoxic damage.
  • To elucidate the signaling pathways involved in ThR-mediated protection under hypoxia.
  • To explore the therapeutic potential of ThR activation in ischemic heart conditions.

Main Methods:

  • Primary myocyte cultures and in vivo ischemic pig heart models were used.
  • ThR mRNA levels were measured under hypoxic conditions with and without ThR activation (TRAP, alpha-thrombin).

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  • Cell signaling pathways involving protein kinase C, Ras, Src, and Vav were analyzed using dominant oncogenes and transfection.

    • Main Results:

    • Hypoxic stress markedly reduced ThR mRNA levels in myocytes and ischemic pig hearts.
    • Prior activation of ThR with TRAP or alpha-thrombin fully protected ThR mRNA levels during hypoxia.
    • ThR protection is mediated by specific signaling cascades involving Ras, Src, and Vav, and is blocked by protein kinase C inhibition.

    Conclusions:

    • Thrombin receptor (ThR) activation protects its mRNA from decay under hypoxic conditions.
    • This ThR-mediated protection involves intracellular signaling pathways initiated by receptor activation.
    • Maintaining ThR levels via activation may serve as a repair mechanism in ischemic heart tissue, aiding functional recovery.