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Lipid peroxidation--an initial event in experimental acute renal failure
M Joannidis1, G Bonn, W Pfaller
1Institute of Physiology, University of Innsbruck, Austria.
Abstract:
A method was developed to monitor the occurrence of lipid peroxidation (LPO) during ischemia and Na-maleate-induced acute renal failure (ARF) on male rats in vivo by measuring malondialdehyde (MDA) levels in arterial and renal venous blood and in urine. No signs of LPO could be detected under control conditions. In ischemic ARF produced by 45 min of renal artery clamping a steep increase of MDA was found in the renal venous effluent immediately after starting reperfusion. This effect was nearly abolished after 5 min of blood reflow while glomerular filtration remained at 5% of control value during a 90-min postischemic observation period. Intoxication with Na-maleate leads to enhanced LPO in combination with an impaired renal function 2 h after administration. These findings would well explain cellular damage and some aspects of renal dysfunction associated with the initiation phase of ARF.
Insights
This study developed a method to measure lipid peroxidation (LPO) during acute renal failure (ARF) in rats. Increased malondialdehyde (MDA) levels indicate LPO and cellular damage in ARF.
Area of Science:
- Biochemistry
- Nephrology
- Pathophysiology
Background:
- Lipid peroxidation (LPO) is implicated in cellular damage during acute renal failure (ARF).
- Measuring malondialdehyde (MDA) offers a potential biomarker for LPO in renal injury.
Purpose of the Study:
- To develop and validate a method for monitoring LPO during ischemia and Na-maleate-induced ARF in rats.
- To correlate MDA levels with renal function and cellular damage markers.
Main Methods:
- In vivo monitoring of MDA levels in arterial blood, renal venous blood, and urine.
- Induction of ARF via renal artery clamping (ischemia) and Na-maleate intoxication.
- Assessment of glomerular filtration rate post-insult.
Main Results:
- Significant increase in MDA levels in renal venous blood immediately post-reperfusion following ischemic ARF.
- MDA increase diminished rapidly, while glomerular filtration remained severely impaired.
- Na-maleate intoxication led to elevated LPO and impaired renal function within 2 hours.
Conclusions:
- The developed method effectively monitors LPO during ARF.
- Increased MDA levels correlate with cellular damage and dysfunction in the early phase of ARF.
- Findings support LPO's role in the pathophysiology of ischemic and toxic ARF.