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Gut ischemia/reperfusion-induced liver dysfunction occurs despite sustained oxygen consumption
R S Poggetti1, E E Moore, F A Moore
1Department of Surgery, Denver General Hospital, Colorado.
The Journal of Surgical Research
|May 1, 1992
Summary
Gut ischemia/reperfusion impairs liver function by reducing bile flow, even when oxygen supply is controlled. This suggests a signaling pathway, not oxygen levels, causes liver dysfunction after gut injury.
Area of Science:
- Gastroenterology
- Hepatology
- Surgical Research
Background:
- Gut ischemia/reperfusion (I/R) is known to cause liver dysfunction in vivo.
- Previous studies indicated increased albumin leak and decreased mitochondrial redox potential post-gut I/R.
Purpose of the Study:
- To investigate liver dysfunction caused by gut I/R in an ex vivo model.
- To control oxygen delivery (DO2) and assess its role in gut I/R-induced liver dysfunction.
Main Methods:
- Rats underwent sham surgery or superior mesenteric artery (SMA) occlusion for 45 minutes.
- Gut and liver were isolated ex vivo 6 hours post-occlusion.
- Controlled perfusion of blood via hepatic artery and portal vein, monitoring pressures, DO2, and oxygen consumption (VO2) using the Fick method.
Main Results:
- Both gut and liver DO2 and VO2 were maintained in both gut I/R and sham groups.
- Despite maintained VO2, gut I/R led to a significant and persistent reduction in bile flow.
- Liver dysfunction manifested as impaired bile production.
Conclusions:
- Dysfunctional bile production after gut I/R is not caused by impaired oxygen consumption (VO2).
- Gut-liver signaling, independent of oxygen delivery, plays a critical role in liver dysfunction following gut I/R.
- Further research is needed to define the specific gut-liver signaling pathways involved.