Dietary cholesterol atherogenic changes in juvenile rabbits

Area of Science:

• Cardiovascular Science
• Developmental Biology
• Nutritional Science

Background:

• Atherosclerosis, a progressive disease, begins early in life.
• The juvenile period of atherogenesis remains under-investigated.
• Understanding early-life susceptibility is crucial for prevention.

Purpose of the Study:

• To investigate atherogenesis in juvenile rabbits fed a cholesterol-rich diet.
• To compare the impact of cholesterol feeding on younger versus older juvenile rabbits.
• To identify early indicators of atherosclerotic lesion development.

Main Methods:

• Male New Zealand White rabbits (8 and 12 weeks old) were fed a 0.5% cholesterol diet for 8 weeks.
• Plasma lipid profiles (total cholesterol, triglycerides, phospholipids, HDL cholesterol) were analyzed.
• Aortic atherosclerotic lesion areas were quantified and examined histologically.

Main Results:

• Younger rabbits (8 weeks) exhibited significantly larger aortic atherosclerotic lesion areas (32±21%) compared to older rabbits (12 weeks, 3.3±0.3%).
• Lower high-density lipoprotein cholesterol levels were observed in younger rabbits.
• Histology revealed intimal thickening and macrophage accumulation in lesions of younger rabbits.

Conclusions:

• Juvenile rabbits are highly susceptible to dietary cholesterol-induced atherosclerosis.
• Early-life cholesterol exposure leads to significant atherogenic changes in a short period.
• These findings underscore the vulnerability of the juvenile cardiovascular system to dietary factors.