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Characterization of cold-induced heat shock protein expression in neonatal rat cardiomyocytes

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Abstract

Cardiac surgery is usually performed under conditions of cardioplegicischemic arrest. To protect the heart during the ischemic period, themyocardium is exposed to varying degrees of hypothermia. Althoughhyperthermia is known to induce the heat shock response, the moleculareffects of hypothermia on the myocardium have not been investigated. We havestudied the effect of hypothermia on the induction of heat shock proteins inprimary cultures of neonatal cardiomyocytes. Cold stress in cardiomyocytesinduced a 6 fold increase in the heat shock protein HSP70 as compared tocontrol. Increased HSP70 protein levels correlated with induction of HSP70mRNAs. Maximal levels of HSP70 protein appeared 4-6 h following recoveryfrom cold shock, indicating the transient nature of the response. Inductionof HSP25 mRNA was also observed in cold-shocked cardiomyocytes, even thoughincreased HSP25 protein levels were not detected. Our results indicate thathypothermia is capable of inducing the heat shock response in neonatalcardiomyocytes.

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Authors and Affiliations

  1. Division of Cardiovascular Research, Hospital for Sick Children, Department of Clinical Biochemistry, University of Toronto, Toronto, Ontario, Canada

    Eleftheria Laios & Catherine A. Prody

  2. Division of Cardiovascular Research, Hospital for Sick Children, Department of Surgery, University of Toronto, Toronto, Ontario, Canada

    Ivan M. Rebeyka

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  1. Eleftheria Laios
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  2. Ivan M. Rebeyka
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  3. Catherine A. Prody
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Laios, E., Rebeyka, I.M. & Prody, C.A. Characterization of cold-induced heat shock protein expression in neonatal rat cardiomyocytes. Mol Cell Biochem 173, 153–159 (1997). https://doi.org/10.1023/A:1006844114348

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  • DOI: https://doi.org/10.1023/A:1006844114348

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