Lipid transfer proteins (LTP) and atherosclerosis

Area of Science:

• Cardiovascular Science
• Lipid Metabolism
• Atherosclerosis Research

Background:

• Lipid transfer proteins (LTPs) play crucial roles in lipid metabolism and transport.
• Four specific LTPs are examined: three involved in cholesteryl ester (CE) metabolism and one in plasma phospholipid (PL) transfer.
• Their relationship to atherosclerosis, a major focus, is explored through experimental, clinical, and epidemiological studies.

Purpose of the Study:

• To review the involvement of four key lipid transfer proteins in the context of atherosclerosis.
• To analyze the impact of modulating these proteins on cholesterol levels, oxidative stress, and disease progression.
• To assess the therapeutic potential of targeting LTPs for cardiovascular disease prevention and treatment.

Main Methods:

• Review of experimental models of atherosclerosis.
• Analysis of clinical and epidemiological studies on LTPs and cardiovascular disease.
• Examination of data on inhibitors of acyl-CoA:cholesterol acyltransferase (ACAT), cholesteryl ester transfer protein (CETP), and the effects of lecithin cholesterol acyl-transferase (LCAT) and phospholipid transfer protein (PLTP) modulation.

Main Results:

• Inhibition of ACAT 1 and 2 decreases cholesterol absorption and aortic CE esterification.
• CETP inhibitors, like Torcetrapib, significantly increase HDL-C (50-100%) in humans.
• LCAT gene transfer lowers oxidative stress in LCAT-/- mice.
• PLTP deficiency reduces apo B production and oxidative stress in mouse models of atherosclerosis.

Conclusions:

• Targeting CETP offers a promising new strategy for increasing HDL-C and potentially preventing coronary heart disease.
• Modulation of ACAT, LCAT, and PLTP also presents therapeutic possibilities in managing atherosclerosis and related conditions.
• The findings herald a new era in the prevention and treatment of cardiovascular disease through lipid transfer protein manipulation.