Abstract
Mitochondrial permeability transition (MPT) and dysfunctions play a pivotal role in many patho-physiological and toxicological conditions. The interplay of mitochondrial thiol (mtThiol), MPT, Ca2+ homeostasis, and resulting dysfunctions still remains controversial despite studies by several research groups. Present study was undertaken to ascertain the correlation between Ca2+ homeostasis, mtThiol alteration and reactive oxygen species (ROS) in causing MPT leading to mitochondrial dysfunction. mtThiol depletion significantly enhanced Ca2+ dependent MPT (swelling) and depolarization of mitochondria resulting in release of pro-apoptotic proteins like Cyt c, AIF, and EndoG. mtThiol alteration and Ca2+ overload caused reduced mitochondrial electron flow, oxidation of pyridine nucleotides (NAD(P)H) and significantly enhanced ROS generation (DHE and DCFH-DA fluorescence). Studies with MPT inhibitor (Cyclosporin A), Ca2+ uniport blocker (ruthenium red) and Ca2+ chelator (BAPTA) indicated that mitochondrial dysfunction was more pronounced under dual stress of altered mtThiol and Ca2+ overload in comparison with single stress of excessive Ca2+. Transmission electron microscopy confirmed the changes in mitochondrial integrity under stress. Our findings suggest that the Ca2+ overload itself is not solely responsible for structural and functional impairment of mitochondria. A multi-factorial cross-talk between mtThiol, Ca2+ and ROS is responsible for mitochondrial dysfunction. Furthermore, minor depletion of mtThiol was found to be an important factor along with Ca2+ overload in triggering MPT in isolated mitochondria, tilting the balance towards disturbed functionality.
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Acknowledgments
The author’s are grateful to Director, IITR for his interest in this work. Author’s are also thankful to Dr. Yogeshwar Shukla for support in flow cytometric analysis. Author’s are also grateful to Dr. Manjula Murari, Department of Pathology, Sanjay Gandhi Post Graduate Institute of Medical Sciences for support in performing TEM. Mr. Brijesh Kumar Singh is indebted to Council of Scientific and Industrial Research (CSIR) and Ms. Madhulika Tripathi is grateful to Indian Council of Medical Research (ICMR) for grant of Senior Research Fellowship. Authors also thank IITR Publication Review Committee for allocation of manuscript number 2766.
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Singh, B.K., Tripathi, M., Pandey, P.K. et al. Alteration in mitochondrial thiol enhances calcium ion dependent membrane permeability transition and dysfunction in vitro: a cross-talk between mtThiol, Ca2+, and ROS. Mol Cell Biochem 357, 373–385 (2011). https://doi.org/10.1007/s11010-011-0908-0
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DOI: https://doi.org/10.1007/s11010-011-0908-0