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Ponnalagu D, Hussain AT, Thanawala R, Meka J, Bednarczyk P, Feng Y, Szewczyk A, GururajaRao S, Bopassa JC, Khan M, Singh H. Chloride channel blocker IAA-94 increases myocardial infarction by reducing calcium retention capacity of the cardiac mitochondria. Life Sci 2019; 235:116841. [PMID: 31494173 PMCID: PMC7664129 DOI: 10.1016/j.lfs.2019.116841] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 08/28/2019] [Accepted: 09/04/2019] [Indexed: 01/14/2023]
Abstract
Indanyloxyacetic acid-94 (IAA-94), an intracellular chloride channel blocker, is shown to ablate cardioprotection rendered by ischemic preconditioning (IPC), N (6)-2-(4-aminophenyl) ethyladenosine or the PKC activator phorbol 12-myristate 13-acetate and cyclosporin A (CsA) in both ex-vivo and in-vivo ischemia-reperfusion (IR) injury. Thus signifying the role of the IAA-94 sensitive chloride channels in mediating cardio-protection upon IR injury. Although IAA-94 sensitive chloride currents are recorded in cardiac mitoplast, there is still a lack of understanding of the mechanism by which IAA-94 increases myocardial infarction (MI) by IR injury. Mitochondria are the key arbitrators of cell life and death pathways. Both oxidative stress and calcium overload in the mitochondria, elicit pathways resulting in the opening of mitochondrial permeability transition pore (mPTP) leading to cell death. Therefore, in this study we explored the role of IAA-94 in MI and in maintaining calcium retention capacity (CRC) of cardiac mitochondria after IR. IAA-94 inhibited the CRC of the isolated cardiac mitochondria in a concentration-dependent manner as measured spectrofluorimetrically using calcium green-5 N. Interestingly, IAA-94 did not change the mitochondrial membrane potential. Further, CsA a blocker of mPTP opening could not override the effect of IAA-94. We also showed for the first time that IAA-94 perfusion after ischemic event augments MI by reducing the CRC of mitochondria. To conclude, our results demonstrate that the mechanism of IAA-94 mediated cardio-deleterious effects is via modulating the mitochondria CRC, thereby playing a role in mPTP opening. These findings highlight new pharmacological targets, which can mediate cardioprotection from IR injury.
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Affiliation(s)
- Devasena Ponnalagu
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA 19102, United States of America; Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210, United States of America.
| | - Ahmed Tafsirul Hussain
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA 19102, United States of America
| | - Rushi Thanawala
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA 19102, United States of America
| | - Jahnavi Meka
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA 19102, United States of America
| | - Piotr Bednarczyk
- Department of Biophysics, Warsaw University of Life Sciences - SGGW, Poland
| | - Yansheng Feng
- Department of Cellular and Integrative Physiology, University of Texas Health Science Center, San Antonio, TX 78229, United States of America
| | - Adam Szewczyk
- Department of Biochemistry, Nencki Institute of Experimental Biology, Poland
| | - Shubha GururajaRao
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA 19102, United States of America; Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210, United States of America
| | - Jean C Bopassa
- Department of Cellular and Integrative Physiology, University of Texas Health Science Center, San Antonio, TX 78229, United States of America
| | - Mahmood Khan
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210, United States of America; Department of Emergency Medicine, The Ohio State University, Columbus, OH 43210, United States of America
| | - Harpreet Singh
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA 19102, United States of America; Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210, United States of America.
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