Chinese Journal of Tissue Engineering Research ›› 2014, Vol. 18 ›› Issue (5): 681-686.doi: 10.3969/j.issn.2095-4344.2014.05.005

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Impact of warm ischemia injury on mitochondrial morphology and function of rat donor liver after cardiac death

Liu Shu-rong1, Yu Bin2, Jiao Bao-ping1, Liu Yong-feng1   

  1. 1Department of General Surgery, the First Hospital of China Medical University, Shenyang 110001, Liaoning Province, China; 2Second Department of General Surgery, the First People’s Hospital of Shenyang City, Shenyang 110044, Liaoning Province, China
  • Revised:2013-11-04 Online:2014-01-29 Published:2014-01-29
  • About author:Liu Shu-rong, Master, Associate professor, Department of General Surgery, the First Hospital of China Medical University, Shenyang 110001, Liaoning Province, China
  • Supported by:

    Innovation Team Project Program of Education Department of Liaoning Province, No. 2009T104; Special Fund for Health Sector Scientific Research of the Ministry of Health, No. 201002004

Abstract:

BACKGROUND: How to control functional activity of donor liver after cardiac death and maintain the optimal function of grafts are the key issues in organ transplantation study.

OBJECTIVE: To preliminarily explore the effect of warm ischemia injury on the morphology and function of rat donor liver after cardiac death.
METHODS: Cardiac death model was established in Sprague-Dawley rats and the successful models were divided into six groups: control group (warm ischemia for 0 minute), warm ischemia 10 group (warm ischemia for 10 minutes), warm ischemia 20 group (warm ischemia for 20 minutes), warm ischemia 30 group (warm ischemia for 30 minutes), warm ischemia 40 group (warm ischemia for 40 minutes) and warm ischemia 50 group (warm ischemia for 50 minutes). The rat liver specimens in each group were cut into ultrathin sections. The structure of liver cells was observed and photographed by electron microscopy. Flameng score was applied to analyze the degree of mitochondrial damage. Liver mitochondria were extracted and then spectrophotometry was used to assess the viability of cytochrome C oxidase.

RESULTS AND CONCLUSION: Under electron microscopy, there were no significant changes in liver cells within 30 minutes of warm ischemia, nuclear membrane was intact, mitochondria mildly swelled, no mitochondrial crista ruptured, and Flameng score was < 2 points. With the extension of warm ischemia time, the cells became swelling, nuclear chromatin condensated, apoptotic body was clearly visible, mitochondrial matrix coagulated, mitochondria exhibited vacuolation, and Flameng score was 3-4 points. The viability of cytochrome C oxidase showed no significant difference within 30 minutes of warm ischemia, but began to significantly decrease at 40 and 50 minutes. The mitochondrial structure and function after liver injury is not obviously affected by 30 minutes of warm ischemia, and significant changes appear after 40 minutes.



中国组织工程研究
杂志出版内容重点:肾移植肝移植移植;心脏移植;组织移植;皮肤移植;皮瓣移植;血管移植;器官移植组织工程


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Key words: tissue donors, warm ischemia, rats, Sprague-Dawley, hepatocytes, mitochondria, electron transport complex IV, microscopy, electron, transmission

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