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• W1598565218 abstract "Background and Purpose Cardiac ischaemia–reperfusion ( IR ) injury remains a significant clinical problem with limited treatment options available. We previously showed that cardioprotection against IR injury by nitro‐fatty acids, such as nitro‐linoleate ( LNO 2 ), involves covalent modification of mitochondrial adenine nucleotide translocase 1 ( ANT1 ). Thus, it was hypothesized that conjugation of LNO 2 to the mitochondriotropic triphenylphosphonium ( TPP + ) moiety would enhance its protective properties. Experimental Approach TPP + ‐ LNO 2 was synthesized from aminopropyl‐ TPP + and LNO 2 , and characterized by direct infusion MS / MS . Its effects were assayed in primary cultures of cardiomyocytes from adult C57BL/6 mice and in mitochondria from these cells, exposed to simulated IR (SIR) conditions (oxygen and metabolite deprivation for 1h followed by normal conditions for 1h) by measuring viability by LDH release and exclusion of Trypan blue. Nitro‐alkylated mitochondrial proteins were also measured by Western blots, using antibodies to TPP + . Key Results TPP + ‐ LNO 2 protected cardiomyocytes from SIR injury more potently than the parent compound LNO 2 . In addition, TPP + ‐ LNO 2 modified mitochondrial proteins, including ANT1 , in a manner sensitive to the mitochondrial uncoupler carbonylcyanide‐p‐trifluoromethoxyphenylhydrazone ( FCCP) and the ANT1 inhibitor carboxyatractyloside. Similar protein nitro‐alkylation was obtained in cells and in isolated mitochondria, indicating the cell membrane was not a significant barrier to TPP + ‐ LNO 2 . Conclusions and Implications Together, these results emphasize the importance of ANT1 as a target for the protective effects of LNO 2 , and suggest that TPP + ‐conjugated electrophilic lipid compounds may yield novel tools for the investigation of cardioprotection. Linked Articles This article is part of a themed issue on Mitochondrial Pharmacology: Energy, Injury & Beyond. To view the other articles in this issue visit http://dx.doi.org/10.1111/bph.2014.171.issue‐8" @default.
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• W1598565218 date "2014-03-28" @default.
• W1598565218 modified "2023-09-25" @default.
• W1598565218 title "Mitochondrially targeted nitro-linoleate: a new tool for the study of cardioprotection" @default.
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• W1598565218 doi "https://doi.org/10.1111/bph.12405" @default.
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