Abstract
The present study brings out the preventive role of (−)-epigallocatechin-gallate (EGCG) on cardiac mitochondrial metabolism and apoptosis in cigarette smoke (CS)-exposed rats. The CS-exposed rats showed significantly decreased activities of TCA cycle enzymes and mitochondrial enzymatic antioxidants, on the other hand, mitochondrial lipid peroxidation was increased and GSH level was decreased. Further, CS exposure was found to induce cardiac apoptosis through release of cytochrome c into the cytosol, cleavage of pro-caspase-3 to active caspase-3, up-regulation of pro-apoptotic (Bax) and down-regulation of antiapoptotic (Bcl-2) molecules. The CS-induced apoptosis was further confirmed by mitochondrial and nuclear ultra structural apoptotic features as evaluated by electron microscopic studies. EGCG supplementation shelters the activities of TCA cycle enzymes and antioxidant enzymes, with concomitant decrease in lipid peroxidation and increase in GSH level. EGCG administration inhibited apoptosis through the inhibition of cytochrome c release into cytosol, activation of pro-caspase-3, down regulation of Bax and significant up regulation of Bcl-2. EGCG reversed the ultra structural apoptotic alterations of mitochondria and nucleus. The present study has provided experimental evidences that the EGCG treatment enduring to cardio protection at mitochondrial level.
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Abbreviations
- CVD:
-
Cardiovascular disease
- CS:
-
Cigarette smoke
- EGCG:
-
(−)-Epigallocatechin-gallate
- ROS:
-
Reactive oxygen species
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Acknowledgments
We gratefully acknowledge the assistance from Dr. P. V. Anandhbabu, Dr. Murali, Dr. P. Ashok Kumar, and Dr. S. Bharathiraja. We also acknowledge Prof. B. Kannabiran (Retired), Department of Biochemistry and Molecular Biology, Pondicherry University, Puducherry, India for his assistance while revising this manuscript.
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Adikesavan, G., Vinayagam, M.M., Abdulrahman, L.A. et al. (−)-Epigallocatechin-gallate (EGCG) stabilize the mitochondrial enzymes and inhibits the apoptosis in cigarette smoke-induced myocardial dysfunction in rats. Mol Biol Rep 40, 6533–6545 (2013). https://doi.org/10.1007/s11033-013-2673-5
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DOI: https://doi.org/10.1007/s11033-013-2673-5