Lycopene Reduces Cholesterol Absorption and Prevents Atherosclerosis in ApoE^-/- Mice by Downregulating HNF-1α and...

Area of Science:

• Nutritional Science
• Cardiovascular Research
• Molecular Biology

Background:

• Atherosclerosis is a major cause of cardiovascular disease, often linked to high cholesterol levels.
• Niemann-Pick C1-Like 1 (NPC1L1) is a key protein involved in intestinal cholesterol absorption.
• Lycopene, a potent antioxidant, has shown potential in preliminary studies to affect cholesterol metabolism.

Purpose of the Study:

• To investigate the effects of lycopene supplementation on cholesterol absorption in the intestine.
• To determine if lycopene can prevent atherosclerosis progression in a mouse model.
• To elucidate the molecular mechanisms underlying lycopene's action on cholesterol absorption and atherosclerosis.

Main Methods:

• Male apolipoprotein E knockout (ApoE-/-) mice were fed a high-fat diet (HFD) for 19 weeks, with or without lycopene supplementation.
• Serum lipid profiles (total cholesterol, LDL-C, HDL-C) were analyzed.
• Expression levels of NPC1L1 and hepatocyte nuclear factor-1α (HNF-1α) in the small intestine were quantified.
• Atherosclerotic lesion development in the aorta and aortic sinus was assessed using Oil Red O staining.

Main Results:

• Lycopene supplementation significantly reduced serum total cholesterol and LDL-C levels.
• HDL-C levels were increased in mice supplemented with lycopene.
• Downregulation of NPC1L1 and HNF-1α expression was observed in the small intestine of lycopene-treated mice.
• Oil Red O staining revealed a marked reduction in atherosclerotic lesions in the aorta and aortic sinus.

Conclusions:

• Lycopene supplementation effectively inhibits intestinal cholesterol absorption in HFD-fed ApoE-/- mice.
• Lycopene demonstrates a protective effect against atherosclerosis progression.
• The antiatherosclerotic effects of lycopene are mediated through the downregulation of HNF-1α and NPC1L1 expression in the intestine.