Atherosclerosis Development and Aortic Contractility in Hypercholesterolemic Rabbits Supplemented with Two Different...

Area of Science:

• Cardiovascular Science
• Nutritional Science
• Plant Biotechnology

Background:

• Alpha-linolenic acid (ALA) in flaxseed is linked to cardiovascular benefits.
• Transgenic and conventional flaxseed cultivars vary in ALA content.
• Hypercholesterolemia is a key risk factor for cardiovascular disease.

Purpose of the Study:

• To compare the effects of high-ALA transgenic flaxseed (W86) and low-ALA conventional flaxseed (Linola) on lipid profiles, atherosclerosis, and vascular function in hypercholesterolemic rabbits.
• To investigate the role of ALA content in flaxseed's cardiovascular protective effects.

Main Methods:

• Hypercholesterolemic rabbit model fed a high-cholesterol diet.
• Dietary supplementation with W86 flaxseed (high ALA) or Linola flaxseed (low ALA).
• Assessment of plasma lipid profiles, aortic atherosclerosis, and ex vivo vascular contractility.

Main Results:

• High-cholesterol diet increased plasma cholesterol and triglycerides.
• Linola flaxseed significantly reduced atherosclerosis progression compared to W86 flaxseed.
• Both flaxseed types ameliorated diet-induced hypercontractility in aortic rings.
• Flaxseed did not significantly impact nitric oxide synthesis in the vascular wall.

Conclusions:

• Flaxseed, particularly the low-ALA cultivar Linola, demonstrates efficacy in reducing atherosclerosis progression in a hypercholesterolemic rabbit model.
• Flaxseed consumption can improve vascular contractility in hypercholesterolemia.
• The cardiovascular benefits of flaxseed may not be solely attributed to its high ALA content.