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بیوشیمی مولکولی و سلولی 2013
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • nrf2-dependent upregulation of antioxidative enzymes: a novel pathway for hypoxic preconditioning-mediated delayed cardioprotection

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     it has been well demonstrated that hypoxic preconditioning (hpc) can attenuate hypoxia/reoxygenation (h/r)-induced oxidant stress and elicit delayed cardioprotection by upregulating the expression of multiple antioxidative enzymes such as heme oxygenase-1 (ho-1), manganese superoxide dismutase (mnsod) and so on. however, the underlying mechanisms of hpc-induced upregulation of antioxidative enzymes are not fully understood. nuclear factor erythroid 2-related factor 2 (nrf2) is an essential transcription factor that regulates expression of several antioxidant genes via binding to the antioxidant response element (are) and plays a crucial role in cellular defence against oxidative stress. here, we wondered whether activation of the nrf2–are pathway is responsible for the induction of antioxidative enzymes by hpc and contributes to the delayed cardioprotection of hpc. cellular model of hpc from rat heart-derived h9c2 cells was induced 24 h prior to h/r. the results showed that hpc efficiently attenuated h/r-induced viability loss and lactate dehydrogenase leakage. in addition, hpc increased nuclear translocation and are binding of nrf2 during the late phase, upregulated the expression of antioxidative enzymes (ho-1 and mnsod), inhibited h/r-induced oxidant stress. however, when nrf2 was specifically knocked down by sirna, the induction of antioxidative enzymes by hpc was completely abolished and, as a result, the inhibitory effect of hpc on h/r-induced oxidant stress was reversed, and the delayed cardioprotection induced by hpc was also abolished. these results suggest that hpc upregulates antioxidative enzymes through activating the nrf2–are pathway and confers delayed cardioprotection against h/r-induced oxidative stress.

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