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Risk of overestimation of free malondialdehyde in perfused rat hearts due to homogenization artifacts
R J Verbunt1, J M Egas, A Van der Laarse
1Department of Cardiology, University Hospital Leiden, Netherlands.
Objectives:
The aims of the present study were to determine (1) whether free malondialdehyde (MDA) was artifactually formed during homogenization of myocardial tissue and (2) whether free MDA was increased in reperfused rat hearts.
Methods:
Groups of isolated buffer-perfused rat hearts were subjected to control perfusion, or 20 min of ischemia, or 20 min of ischemia followed by 5 or 30 min of reperfusion. The hearts were subsequently assayed for free MDA by ion-pairing high-performance liquid chromatography following homogenization in the absence or presence of the antioxidant butylated hydroxytoluene (0.01%).
Results:
Tissue homogenates prepared in the absence of butylated hydroxytoluene contained significantly higher (P < 0.001) free MDA levels than tissue homogenates from the same hearts prepared in the presence of butylated hydroxytoluene. Free MDA levels of tissue homogenates prepared in the presence of butylated hydroxytoluene were below the detection limit (20 pmol/mg protein) in 27 of 30 tissue homogenates, irrespective of the perfusion protocol. Control experiments showed that the presence of butylated hydroxytoluene did not interfere with the detection of free MDA.
Conclusions:
These results indicate that free MDA was formed artifactually during tissue homogenization in the absence of butylated hydroxytoluene. Furthermore, free MDA could not be detected in perfused rat hearts after control perfusion, or 20 min of ischemia, or 20 min of ischemia followed by 5 or 30 min of reperfusion.
Insights
Free malondialdehyde (MDA) is artifactually formed during myocardial tissue homogenization. When protected by butylated hydroxytoluene, MDA was undetectable in reperfused rat hearts, indicating no increase post-ischemia.
Area of Science:
- Biochemistry
- Cardiovascular Physiology
- Oxidative Stress Research
Background:
- Malondialdehyde (MDA) is a marker of lipid peroxidation.
- Assessing MDA levels in myocardial tissue requires careful methodological consideration to avoid artifactual formation.
- Previous studies have not definitively established whether MDA increases following ischemia-reperfusion injury in isolated perfused hearts.
Purpose of the Study:
- To investigate the potential for artifactual formation of free malondialdehyde (MDA) during myocardial tissue homogenization.
- To determine if free MDA levels are elevated in rat hearts subjected to ischemia and reperfusion.
Main Methods:
- Isolated rat hearts were perfused and subjected to control, ischemic, or ischemic-reperfusion protocols.
- Tissue homogenization was performed with and without the antioxidant butylated hydroxytoluene (BHT).
- Free MDA was quantified using ion-pairing high-performance liquid chromatography.
Main Results:
- Tissue homogenates prepared without BHT showed significantly higher free MDA levels compared to those prepared with BHT (P < 0.001).
- In the presence of BHT, free MDA was below the detection limit in most samples, regardless of the perfusion protocol.
- BHT did not interfere with MDA detection, confirming its antioxidant role during homogenization.
Conclusions:
- Artifactual formation of free MDA occurs during myocardial tissue homogenization when antioxidants are absent.
- Free MDA is not detectable in perfused rat hearts following ischemia or ischemia-reperfusion under the conditions studied.
- These findings highlight the importance of using antioxidants during sample processing for accurate MDA assessment.