Lipid/Lipoprotein Structure and Metabolism (Overview)
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1 Lipid/Lipoprotein Structure and Metabolism (Overview) Philip Barter President, International Atherosclerosis Society Centre for Vascular Research University of New South Wales Sydney, Australia
2 Disclosures Received honorariums for participating as a consultant or as a member of advisory boards for AMGEN, AstraZeneca, CSL-Behring, Lilly, Merck, Novartis, Pfizer and Roche and for giving lectures for AMGEN, AstraZeneca, Merck and Pfizer.
3 Atherosclerotic Cardiovascular disease
4 Atherosclerotic Cardiovascular disease
5 Clinical manifestations of Atherosclerotic Cardiovascular Disease (ASCVD) Coronary artery: Myocardial infarction Carotid artery: Stroke Mesenteric artery: Intestinal gangrene Other arteries: Peripheral arterial disease
6 Modifiable Risk Factors for Atherosclerotic Cardiovascular disease (ASCVD) Smoking Elevated low density lipoproteins (LDLs) Elevated triglyceride-rich lipoproteins Reduced high density lipoproteins (HDLs) Elevated blood pressure Diabetes Abdominal obesity
7 Modifiable Risk Factors for Atherosclerotic Cardiovascular disease (ASCVD) Smoking Elevated low density lipoproteins (LDLs) Elevated triglyceride-rich lipoproteins Reduced high density lipoproteins (HDLs) Elevated blood pressure Diabetes Abdominal obesity
8 Plasma lipoproteins Why do we have plasma lipoproteins? What are plasma lipoproteins? What is the metabolism of plasma lipoproteins? What is the relationship of plasma lipoproteins to atherosclerosis?
9 Plasma lipoproteins Why do we have plasma lipoproteins? What are plasma lipoproteins? What is the metabolism of plasma lipoproteins? What is the relationship of plasma lipoproteins to atherosclerosis?
10 Why do we have plasma lipoproteins? Main reason for having plasma lipoproteins is to transport triglyceride and cholesterol through plasma between tissues Plasma is mainly water and cholesterol and triglyceride are not water-soluble Incorporation of cholesterol and triglyceride into lipoproteins allows them to be transported in plasma
11 Why do we have plasma lipoproteins? Several other functions of plasma lipoproteins will be covered in other lectures
12 Plasma lipoproteins Why do we have plasma lipoproteins? What are plasma lipoproteins? What is the metabolism of plasma lipoproteins? What is the relationship of plasma lipoproteins to atherosclerosis?
13 Structure of plasma lipoproteins Surface monolayer of phospholipids and free cholesterol apolipoproteins Hydrophobic core of triglyceride and cholesteryl esters
14 Lipoprotein fractions in plasma Chylomicrons, VLDLs, and their catabolic remnants Pro-atherogenic LDLs HDLs Anti-atherogenic
15 Chylomicrons Formed in intestinal cells Function to transport dietary triglyceride and cholesterol to tissues in the body Main core lipid is triglyceride Main protein is apob-48
16 Very low density lipoproteins (VLDLs) Formed in the liver Function to transport triglyceride and cholesterol from the liver to tissues in the body Main core lipids is triglycerides Main protein is apob-100
17 Low density lipoproteins (LDLs) Formed as end-products of the catabolism of VLDLs Function to transport cholesterol from plasma to tissues in the body Main core lipids are cholesteryl esters Main protein is apob-100
18 High density lipoproteins (HDLs) Assembled within the plasma from several constituents Function to transport intracellular cholesterol into the plasma Main core lipids are cholesteryl esters Main proteins are apoa-i and apoa-ii
19 Plasma lipoproteins Why do we have plasma lipoproteins? What are plasma lipoproteins? What is the metabolism of plasma lipoproteins? What is the relationship of plasma lipoproteins to atherosclerosis?
20 Plasma lipid transport: Exogenous pathway
21 Formation of chylomicrons Chylomicron Lymph (thoracic duct) Blood FC FFA Intestinal cell Free cholesterol (FC) Free fatty acid (FFA) Intestinal lumen
22 Metabolism of chylomicrons Intestine Chylomicron LPL FFA Adipose and other tissues TP Liver HDL Chylomicron remnant
23 Plasma lipid transport: Endogenous pathway
24 Endogenous pathway Liver FC FFA Adipose tissue
25 Endogenous pathway FC Liver VLDL FFA Adipose tissue
26 Endogenous pathway Liver VLDL FC LPL FFA FFA Adipose and other tissues Adipose tissue
27 Endogenous pathway Liver VLDL FC LPL FFA FFA LDL Adipose and other tissues Adipose tissue
28 Endogenous pathway Liver VLDL FC LPL FFA FFA LDL Adipose and other tissues Adipose tissue Liver LDL receptor
29 Endogenous pathway Liver VLDL FC LPL FFA FFA LDL Adipose and other tissues Adipose tissue Liver LDL receptor LDL receptor Cell in peripheral tissue
30 Endogenous pathway Liver VLDL FC LPL FFA FFA LDL Adipose and other tissues Adipose tissue Liver LDL receptor LDL receptor FC New synthesis Cell in peripheral tissue
31 Endogenous pathway Liver VLDL FC LPL FFA FFA LDL Adipose and other tissues Adipose tissue Liver LDL receptor LDL receptor HDL LCAT ABCA1 FC New synthesis Cell in peripheral tissue
32 Endogenous pathway Liver VLDL FC FFA LPL LDL FFA Adipose and other tissues Adipose tissue Liver LDL receptor LDL receptor HDL LCAT ABCA1 FC New synthesis Cell in peripheral tissue
33 Endogenous pathway Liver VLDL FC FC FFA LPL LDL FFA Adipose and other tissues Adipose tissue Liver LDL receptor LDL receptor Bile HDL LCAT ABCA1 FC New synthesis Cell in peripheral tissue
34 Endogenous pathway Liver VLDL FC FC FFA LPL LDL FFA Adipose and other tissues Adipose tissue TP Liver LDL receptor LDL receptor Bile HDL LCAT ABCA1 FC New synthesis Cell in peripheral tissue
35 Formation and metabolism of HDL
36 Structure of HDL Surface monolayer of phospholipids and free cholesterol apoa-i apoa-ii Hydrophobic core of triglyceride and cholesteryl esters
37 HDL Charge and shape Lipid-poor apoa-i Prebeta mobility Discoidal Prebeta mobility Spherical Alpha mobility
38 HDL Subpopulations PARTICLE SHAPE APOLIPOPROTEIN COMPOSITION Discoidal Spherical A-I HDL A-I/A-II HDL PARTICLE SIZE Lipid-poor apoa-i HDL 2b HDL 2a HDL 3a HDL 3b HDL 3c
39 Formation of HDL LIVER INTESTINE Chylomicrons Lipid-poor apoa-i Lipolysis
40 Lipidation of apoa-i to form discoidal HDL Lipid-poor apoa-i Cell membrane ABCA-1 phospholipid, cholesterol Discoidal HDL
41 Role of LCAT in formation of spherical HDL Liver Intestine Free cholesterol transferred from cell membranes (including liver and intestine) apoa-i free cholesterol LCAT cholesteryl esters Discoidal HDL Spherical HDL
42 Role of TP and SRB1 in HDL metabolism Liver LDL-R SR-B1 FC SR-B1 TP VLDL/LDL Bile HDL LCAT FC Extrahepatic Tissues (including the artery wall Free Cholesterol
43 Plasma lipoproteins Why do we have plasma lipoproteins? What are plasma lipoproteins? What is the metabolism of plasma lipoproteins? What is the relationship of plasma lipoproteins to atherosclerosis?
44 ATHEROSCLEROSIS
45 ATHEROSCLEROSIS Monocyte Vessel Lumen Adhesion Molecule MCP-1 Endothelium Intima Macrophage Foam Cell
46 Lipoprotein classes and atherosclerosis Non-HDL Chylomicrons, VLDL, and their catabolic remnants Pro-atherogenic LDL HDL Anti-atherogenic
47 ROLE OF LDLs IN CAUSING ATHEROSCLEROSIS Monocyte LDL Vessel Lumen Adhesion Molecule MCP-1 LDL Endothelium Cytokines MODIFIED LDL Intima Macrophage Foam Cell
48 It has been proven beyond all doubt in many large clinical trials that reducing level of LDL cholesterol reduces the risk of having a cardiovascular event
49 CLINICAL INTERVENTION TRIALS REDUCTION IN MCVEs EVENTS (%) SEARCH IMPROVE-IT ALLHAT IDEAL LRC LIPID CARE TNT HPS AFCAPS Posch ASCOT WOS 4S CARDS JUPITER REDUCTION IN LDL CHOLESTEROL (mg/dl)
50 Lipoprotein classes and atherosclerosis Non-HDL Chylomicrons, VLDL, and their catabolic remnants Pro-atherogenic LDL HDL Anti-atherogenic
51 ROLE OF TRIGLYRIDE-RICH LIPOPROTEINS (TRLS) IN CAUSING ATHEROSCLEROSIS Monocyte TRL remnants Vessel Lumen Adhesion Molecule MCP-1 TRL remnants Endothelium Cytokines Modified TRL remnants Intima Macrophage Foam Cell
52 It is likely (but still not proven) that reducing levels of triglyceride-rich lipoproteins will reduce the risk of having a cardiovascular event
53 INHIBITION OF ATHEROSCLEROSIS BY HDLs Monocyte HDL INHIBIT ADHESION MOLECULE EXPRESSION HDL INHIBIT MCP-1 EXPRESSION LDL Vessel Lumen Adhesion Molecule MCP-1 LDL Endothelium HDL INHIBIT OXIDATION OF LDL Cytokines MODIFIED LDL Intima Macrophage HDL PROMOTE CHOLESTEROL EFFLUX Foam Cell
54 It is possible (but not proven) that increasing levels of HDLs will reduce the risk of having a cardiovascular event
55 Conclusions Plasma lipoproteins transport triglyceride and cholesterol through plasma between tissues LDLs and the remnants of triglyceride-rich lipoproteins cause atherosclerosis, while HDLs protect Reducing plasma levels of LDL cholesterol reduces the risk of having a cardiovascular event It is still not known whether decreasing triglyceride-rich lipoproteins or increasing HDL levels reduce cardiovascular risk
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