Mitochondrial function after liver preservation in high or low ionic-strength solutions: a comparison between...

Area of Science:

• Organ transplantation
• Biochemistry
• Cellular physiology

Background:

• Liver preservation solutions are critical for transplant success.
• Modified University of Wisconsin (mod UW) and sucrose-based solution (SBS) are common preservation agents.
• Understanding their impact on mitochondrial function is essential.

Purpose of the Study:

• To evaluate mitochondrial function in liver tissue after cold storage and normothermic reperfusion.
• To compare the effects of mod UW and SBS preservation solutions on liver mitochondria.

Main Methods:

• Liver tissues were cold-preserved and then reperfused in vitro.
• Assays included ATP determination, mitochondrial respiration, succinate oxidase activity, H+-ATPase activity, and intramitochondrial potassium concentration.
• Evaluations were performed after 1-hour and 24-hour storage periods.

Main Results:

• No significant difference in ATP content after 1-hour storage, but a 50% decrease after 24-hour storage for both solutions.
• Increased mitochondrial potassium in mod UW after 1-hour storage.
• SBS significantly increased ADP and uncoupler-stimulated respiration, especially after 24-hour storage.
• Succinate oxidase activity remained unchanged; H+-ATPase activity was inhibited after 24-hour storage in both groups.

Conclusions:

• Low ionic strength preservation solutions, like SBS, can modulate mitochondrial energy metabolism by increasing substrate oxidation.
• Mitochondrial function is significantly affected by cold storage and reperfusion, with some changes occurring even after brief cold exposure.