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Signal transduction mechanisms involved in cardiac preconditioning: Role of Ras-GTPase, Ca2 +/calmodulin-dependent protein kinase II and epidermal growth factor receptor

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Abstract

It is well established that brief episodes of ischemia/reperfusion (I/R) [preconditioning (PC)] protect the myocardium from the damage induced by subsequent more prolonged I/R. However, the signaling pathways activated during PC or I/R are not well characterized. In this study, the role of Ras-GTPase, tyrosine kinases (TKs), epidermal growth factor receptor (EGFR) and Ca2 +/calmodulin-dependent protein kinase II (CaMK II) in mediating PC in a perfused rat heart model was investigated. A 40-min episode of global ischemia in perfused rat hearts produced significantly impaired cardiac function, measured as left ventricular developed pressure (Pmax) and left ventricular end-diastolic pressure (LVEDP), and impaired coronary hemodynamics, measured as coronary flow (CF) and coronary vascular resistance (CVR). PC significantly enhanced cardiac recovery after I/R. Combination of PC and FPT III (Ras-GTPase inhibitor FPT III; 232 ng/min for 6 days) treatment did not produce any additive benefits as compared to PC alone. In contrast, PC-induced improvements in cardiac function after I/R were significantly attenuated by pretreatment with genistein (1mg/kg/day for 6 days), a broad-spectrum inhibitor of TKs, or AG1478 (1mg/kg/day for 6 days), a specific inhibitor of EGFR tyrosine kinase or KN-93 (578 ng/min for 6 days), a CaMK II inhibitor, before PC. These observations suggest that PC and FPT III pretreatment may produce cardioprotection via similar mechanisms. Present results also indicate that activation of TKs and specifically activation of EGFR-mediated TKs and CaMK II-mediated regulation of calcium homeostasis are part of the PC mechanisms that improve recovery after I/R. (Mol Cell Biochem 268: 175–183, 2005)

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Authors and Affiliations

  1. Department of Pharmacology & Toxicology, Faculty of Medicine, Kuwait University, Safat, Kuwait

    Ibrahim F. Benter, Mariam H. M. Yousif & Halit Canatan

  2. Department of Physiology, Faculty of Medicine, Kuwait University, Safat, Kuwait

    Jasbir S. Juggi

  3. Department of Biochemistry, Faculty of Medicine, Kuwait University, Safat, Kuwait

    Islam Khan

  4. Centre for Genome-based Therapeutics, Welsh School of Pharmacy, Cardiff University, Cardiff, UK

    Saghir Akhtar

Authors
  1. Ibrahim F. Benter
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  2. Jasbir S. Juggi
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  3. Islam Khan
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  4. Mariam H. M. Yousif
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  5. Halit Canatan
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  6. Saghir Akhtar
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Correspondence to Ibrahim F. Benter.

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Benter, I.F., Juggi, J.S., Khan, I. et al. Signal transduction mechanisms involved in cardiac preconditioning: Role of Ras-GTPase, Ca2 +/calmodulin-dependent protein kinase II and epidermal growth factor receptor. Mol Cell Biochem 268, 175–183 (2005). https://doi.org/10.1007/s11010-005-3895-1

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  • DOI: https://doi.org/10.1007/s11010-005-3895-1

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