SEVERE BURN-INDUCED MITOCHONDRIAL RECRUITMENT OF CALPAIN CAUSES ABERRANT MITOCHONDRIAL DYNAMICS AND HEART DYSFUNCTION

Mitochondrial damage is an important cause of heart dysfunction after severe burn injury. However, the pathophysiological process remains unclear. This study aims to examine the mitochondrial dynamics in the heart and the role of μ-calpain, a cysteine protease, in this scenario. Rats were subjected...

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Published in:Shock (Augusta, Ga.) Ga.), 2023-08, Vol.60 (2), p.255-261
Main Authors: Ran-Ran, Zhang, Jing-Long, Zhang, Qiao, Li, Shu-Miao, Zhang, Xiao-Ming, Gu, Wen, Niu, Jing-Jun, Zhou, Lyu-Chen, Zhou
Format: Article
Language:English
Subjects:
Animals
Basic Science Aspects
Burns - complications
Burns - drug therapy
Burns - metabolism
Calpain
Mitochondria - metabolism
Mitochondrial Dynamics
Rats
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cited_by cdi_FETCH-LOGICAL-c409t-d77b9ff2fb88dee4426477c3c6aa4ab1d60378a2563f0a8c2af47f05a44276183
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container_title Shock (Augusta, Ga.)
container_volume 60
creator Ran-Ran, Zhang
Jing-Long, Zhang
Qiao, Li
Shu-Miao, Zhang
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Wen, Niu
Jing-Jun, Zhou
Lyu-Chen, Zhou
description Mitochondrial damage is an important cause of heart dysfunction after severe burn injury. However, the pathophysiological process remains unclear. This study aims to examine the mitochondrial dynamics in the heart and the role of μ-calpain, a cysteine protease, in this scenario. Rats were subjected to severe burn injury treatment, and the calpain inhibitor MDL28170 was administered intravenously 1 h before or after burn injury. Rats in the burn group displayed weakened heart performance and decreased mean arterial pressure, which was accompanied by a diminishment of mitochondrial function. The animals also exhibited higher levels of calpain in mitochondria, as reflected by immunofluorescence staining and activity tests. In contrast, treatment with MDL28170 before any severe burn diminished these responses to a severe burn. Burn injury decreased the abundance of mitochondria and resulted in a lower percentage of small mitochondria and a higher percentage of large mitochondria. Furthermore, burn injury caused an increase in the fission protein DRP1 in the mitochondria and a decrease in the inner membrane fusion protein OPA1. Similarly, these alterations were also blocked by MDL28170. Of note, inhibition of calpain yielded the emergence of more elongated mitochondria along with membrane invagination in the middle of the longitude, which is an indicator of the fission process. Finally, MDL28170, administered 1 h after burn injury, preserved mitochondrial function and heart performance, and increased the survival rate. Overall, these results provided the first evidence that mitochondrial recruitment of calpain confers heart dysfunction after severe burn injury, which involves aberrant mitochondrial dynamics.
doi_str_mv 10.1097/SHK.0000000000002159
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However, the pathophysiological process remains unclear. This study aims to examine the mitochondrial dynamics in the heart and the role of μ-calpain, a cysteine protease, in this scenario. Rats were subjected to severe burn injury treatment, and the calpain inhibitor MDL28170 was administered intravenously 1 h before or after burn injury. Rats in the burn group displayed weakened heart performance and decreased mean arterial pressure, which was accompanied by a diminishment of mitochondrial function. The animals also exhibited higher levels of calpain in mitochondria, as reflected by immunofluorescence staining and activity tests. In contrast, treatment with MDL28170 before any severe burn diminished these responses to a severe burn. Burn injury decreased the abundance of mitochondria and resulted in a lower percentage of small mitochondria and a higher percentage of large mitochondria. Furthermore, burn injury caused an increase in the fission protein DRP1 in the mitochondria and a decrease in the inner membrane fusion protein OPA1. Similarly, these alterations were also blocked by MDL28170. Of note, inhibition of calpain yielded the emergence of more elongated mitochondria along with membrane invagination in the middle of the longitude, which is an indicator of the fission process. Finally, MDL28170, administered 1 h after burn injury, preserved mitochondrial function and heart performance, and increased the survival rate. Overall, these results provided the first evidence that mitochondrial recruitment of calpain confers heart dysfunction after severe burn injury, which involves aberrant mitochondrial dynamics.</description><identifier>ISSN: 1073-2322</identifier><identifier>EISSN: 1540-0514</identifier><identifier>DOI: 10.1097/SHK.0000000000002159</identifier><identifier>PMID: 37278996</identifier><language>eng</language><publisher>United States: Lippincott Williams &amp; Wilkins</publisher><subject>Animals ; Basic Science Aspects ; Burns - complications ; Burns - drug therapy ; Burns - metabolism ; Calpain ; Mitochondria - metabolism ; Mitochondrial Dynamics ; Rats</subject><ispartof>Shock (Augusta, Ga.), 2023-08, Vol.60 (2), p.255-261</ispartof><rights>Copyright © 2023 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the Shock Society.</rights><rights>Copyright © 2023 The Author(s). 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subjects Animals
Basic Science Aspects
Burns - complications
Burns - drug therapy
Burns - metabolism
Calpain
Mitochondria - metabolism
Mitochondrial Dynamics
Rats
title SEVERE BURN-INDUCED MITOCHONDRIAL RECRUITMENT OF CALPAIN CAUSES ABERRANT MITOCHONDRIAL DYNAMICS AND HEART DYSFUNCTION
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