Hepatic mitochondrial bioenergetics in aged C57BL/6 mice exhibit delayed recovery from severe burn injury

BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR BASIS OF DISEASE

卷:1863

Article

Auger, Christopher¹  Sivayoganathan, Thibacg¹  Abdullahi, Abdikarim¹  Parousis, Alexandra¹  Jeschke, Marc G.¹ 

[1] Sunnybrook Hlth Sci Ctr, Ross Tilley Burn Ctr, Toronto, ON M4N 3M5, Canada

关键词: Trauma;    Oxidative phosphorylation;    Electron transport chain;    Oxidative stress;    Elderly;   

DOI  :  10.1016/j.bbadis.2017.07.006

来源: Elsevier

【 摘 要 】

Severe burn injuries initiate a cascade of downstream events, culminating in multiple organ dysfunction, sepsis, and even death. The elderly are in particular vulnerable to such outcomes, due primarily to a scarcity of knowledge on trauma progression at the biomolecular level in this population. Mitochondria, the cellular powerhouses, have been increasingly scrutinized recently for their contribution to trauma outcomes. We hypothesized that elderly have a worse outcome compared to adult patients due to failed recovery of hepatic mitochondria. Using a murine model of burn injury, Seahorse respirometry and functional proteomic assays, we demonstrate the impact of thermal trauma on hepatic mitochondrial respiration in adult and aged mice. While the mitochondria in adults rebound from the initial insult within 7 days of the injury, the older animals display delayed recovery of mitochondrial bioenergetics accompanied by uncoupling and an oxidative environment. This is associated with a state of increased protein oxidation and nitrosylation, along with increases in circulating mtDNA, a known damage-associated molecular pattern. These findings suggest that hepatic mitochondria fail to normalize after trauma in aged mice and we suggest that this cellular failure is associated with organ damage and subsequently increased morbidity and mortality in elderly burn patients.

【 授权许可】

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