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Ischemic but not mechanical preconditioning attenuates ischemia/reperfusion induced myocardial apoptosis in anaesthetized rabbits: The role of Bcl-2 family proteins and ERK1/2

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Abstract

Objective: Recent studies suggest that ischemic preconditioning (IPC) inhibits myocardial apoptosis after ischemia and reperfusion. This study aimed first, to examine whether short mechanical stretch with acute pressure overload (MPC), which has been shown to reduce infarct size after ischemia/reperfusion, mimics IPC in attenuating myocardial apoptosis and second, to evaluate whether induced cardioprotection involves modulation of the expression of the Bcl-2 family proteins and phosphorylation of prosurvival kinases. Methods and Results: A model of anaesthetized rabbit was used and the preconditioning protocol included one cycle of short ischemia/reperfusion, or short mechanical stretch with acute pressure overload. Preconditioning stimuli were equally effective in reducing the infarct size, determined after 4 h reperfusion. However, IPC but not MPC attenuated myocardial apoptosis. IPC restored the decreased expression of Bcl-2 and Bcl-xL observed in hearts subjected to ischemia and reperfusion only. Bax levels were not different among the groups. ERK1/2 were activated during reperfusion in both IPC and MPC groups. Conclusions: The data provide further evidence that apoptosis and necrosis contribute independently to infarct size after ischemia and reperfusion. Inhibition of the myocardial apoptotic processes by IPC may involve modulation of the expression of anti-apoptotic proteins, Bcl-2 and Bcl-xL. ERK1/2 may be involved in the inhibition of both apoptosis and necrosis.

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Authors and Affiliations

  1. Laboratory of Animal Physiology, Department of Zoology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece

    Antigone Lazou, D. Cieslak, K. Voskarides & S. Mousikos

  2. 2nd University Department of Cardiology, Medical School, Attikon General Hospital, University of Athens, Athens, 124 62

    E. K. Iliodromitis, E. Bofilis & D. T. Kremastinos

Authors
  1. Antigone Lazou
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  2. E. K. Iliodromitis
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  3. D. Cieslak
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  4. K. Voskarides
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  5. S. Mousikos
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  6. E. Bofilis
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  7. D. T. Kremastinos
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Correspondence to Antigone Lazou.

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Lazou, A., Iliodromitis, E.K., Cieslak, D. et al. Ischemic but not mechanical preconditioning attenuates ischemia/reperfusion induced myocardial apoptosis in anaesthetized rabbits: The role of Bcl-2 family proteins and ERK1/2. Apoptosis 11, 2195–2204 (2006). https://doi.org/10.1007/s10495-006-0292-5

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  • DOI: https://doi.org/10.1007/s10495-006-0292-5

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