Changes in rat heart phospholipid composition after rapeseed oil feeding

Area of Science:

• Cardiovascular Science
• Nutritional Biochemistry
• Lipid Metabolism

Background:

• Rapeseed oil (RO) consumption varies globally.
• Erucic acid (EA) content in RO differs significantly between varieties.
• Potential cardiac effects of long-term EA exposure remain a concern.

Purpose of the Study:

• To investigate the impact of high-erucic acid (HEAR) vs. low-erucic acid (LEAR) rapeseed oil on rat heart phospholipid composition.
• To determine if EA levels influence specific phospholipid classes and their fatty acid profiles.
• To correlate observed phospholipid alterations with potential cardiac pathology.

Main Methods:

• Rats were fed either HEAR (46.2% EA) or LEAR (3.7% EA) rapeseed oil for 20 weeks.
• Heart phospholipid composition was analyzed.
• Fatty acid patterns of specific phospholipids (phosphatidylethanolamine, phosphatidylcholine, cardiolipin, sphingomyelin) were determined.

Main Results:

• HEAR feeding resulted in a twofold increase in cardiac sphingomyelin content.
• HEAR feeding led to incorporation of 22:1 fatty acids into cardiolipin and sphingomyelin.
• LEAR feeding did not significantly alter heart phospholipid composition, though minor changes in sphingomyelin fatty acids were noted.

Conclusions:

• Long-term HEAR consumption significantly alters rat heart phospholipid composition, particularly sphingomyelin.
• The acyl-moiety changes in cardiolipin and sphingomyelin may be linked to cardiac lesions observed after HEAR feeding.
• LEAR rapeseed oil appears to have a negligible impact on cardiac phospholipid profiles.