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Plasma lipoproteins constitute a unique macromolecular system of lipid-protein complexes responsible for the transport of lipids from their sites of origin to their sites of utilization either as metabolic fuel or as structural components of cell membranes. Although studies on the role of lipoproteins in the mechanism of lipid transport are meritorious in their own right, the ever-increasing interest in chemical and functional properties of this remarkable class of conjugated proteins stems from the impressive evidence of their direct involvement in the genesis and develop ment of atherosclerotic lesions. The initial emphasis on neutral lipids and phospholipids as the most characteristic constituents of operationally defined lipoprotein classes has shifted in recent years to their protein moieties or apolipoproteins. The discovery of a number of apolipoproteins and characterization of familial hypolipoproteinemias as apolipoprotein deficiency disorders indicated that apolipoproteins play an essential role in maintaining the structural stability and integrity of lipoprotein particles. In addition to their role in the formation of lipoproteins, apolipoproteins were shown to perform a variety of functions in metabolic conversion of lipoproteins and their interactions with cellular surfaces. Results from several laboratories have demonstrated that the chemical and metabolic heterogeneity of operationally-defined lipoprotein classes is due to the presence of several discrete lipoprotein particles with similar physical properties but different and characteristic apolipoprotein composition. Thus, the apolipoproteins have emerged not only as essential structural and functional constituents of lipoproteins but also as unique chemical markers for identifying and classifying lipoprotein particles.
Plasma lipoproteins constitute a unique macromolecular system of lipid-protein complexes responsible for the transport of lipids from their sites of origin to their sites of utilization either as metabolic fuel or as structural components of cell membranes. Although studies on the role of lipoproteins in the mechanism of lipid transport are meritorious in their own right, the ever-increasing interest in chemical and functional properties of this remarkable class of conjugated proteins stems from the impressive evidence of their direct involvement in the genesis and develop ment of atherosclerotic lesions. The initial emphasis on neutral lipids and phospholipids as the most characteristic constituents of operationally defined lipoprotein classes has shifted in recent years to their protein moieties or apolipoproteins. The discovery of a number of apolipoproteins and characterization of familial hypolipoproteinemias as apolipoprotein deficiency disorders indicated that apolipoproteins play an essential role in maintaining the structural stability and integrity of lipoprotein particles. In addition to their role in the formation of lipoproteins, apolipoproteins were shown to perform a variety of functions in metabolic conversion of lipoproteins and their interactions with cellular surfaces. Results from several laboratories have demonstrated that the chemical and metabolic heterogeneity of operationally-defined lipoprotein classes is due to the presence of several discrete lipoprotein particles with similar physical properties but different and characteristic apolipoprotein composition. Thus, the apolipoproteins have emerged not only as essential structural and functional constituents of lipoproteins but also as unique chemical markers for identifying and classifying lipoprotein particles.
Atherosclerosis which accounts in Western Europe for more than 40 % of deaths, is a generalized disease that develops slowly and is symptomless until lesions have become sufficiently severe to cause myocardial or cerebral infarction. Research on specific and precocious markers of atherosclerosis and the development of non invasive techniques for their early detection represent major challenges in biomedical field. We hope that this volume of edited papers, a consequence of the third international colloquium on atherosclerosis, conducted at the University of Brussels, Belgium through the support of the "Fondation de Recherche sur l' AtherosclE,rose" will contribute to this goal. Among the topics discussed the major ones were the mechanism of action of lipolytic enzymes, the deficiency or dysregulation of cellular receptors, the genetic deficiencies of apolipoproteins, and the panoply of external factors as diet, physical exercise, drugs, which mOdify the lipoprotein metabolism. Special interest was also devoted to potent techniques as kinetic analysis of metabolic tracers and use of monoclonal antibodies. Their contribution to the detection and treatment of atherosclerosis will be obviously essential in the future.
Lipoprotein(a) presents the proceedings of the International Symposium, held in Chicago, Illinois, on December 2–3, 1988. It discusses the different aspects of the research on lipoprotein(a), commonly referred to as Lp(a). It covers a wide range of topics, including comparative biology, metabolism, structure, epidemiology, and treatment. Comprised of 15 chapters, the book starts with an overview of the role of Lp(a) in atherosclerotic cardiovascular disease (ASCVD), followed by a discussion on recent findings and developments. It then considers the relationship between elevated plasma Lp(a) and the inherited risk factor for the development of coronary heart disease. The reader is also introduced to the various components of Lp(a), which include neutral lipids, polar lipids, apoprotein(a), and apoprotein B. Other chapters discuss the specific functions of apolipoproteins in plasma lipid metabolism, which determine the fate of the various lipoprotein particles in plasma. This book will be of benefit to cardiologists and medical practitioners.
On November 6 and 7, 1987, lipid and lipoprotein researchers from all over Europe convened in Munich on the occasion of the second European Workshop on Lipid Metabolism (EWLM). This informal gathering was devoted to two main topics, and recent research results were presented and discussed during a poster session. Recent developments in the physiology and pathophysiology of lipoprotein sub fractions were discussed on the first day of the meeting. In recent years, new analytical tools have been created for analyzing lipoprotein subfractions, particularly the apolipoprotein component. With the, introduction of immunological and elec trophoretic methods it has become clear that the heterogeneity of the plasma lipopro tein system is even greater than had been assumed only a decade or so ago. Despite this, it is apparent from the contributions to this volume that new methods for differentiating lipoprotein subfractions will increase our understanding of lipoprotein metabolism, especially of the triglyceride-rich lipoprotein particles and the high density lipoproteins. The complex functions of the various plasma apolipoproteins and their association with the lipoprotein lipid in single or complex lipoprotein particles give rise to a complex and dynamic metabolic system that changes constantly during the day. While it has for some time been possible to delineate fairly accurately the atherogenic potential of low-density lipoproteins, which are comparatively simple lipoprotein particles, the new methods of lipoprotein subfraction analysis will be needed to select and differentiate amongst the potentially atherogenic triglyceride rich particles, especially the chylomicron and very low density lipoprotein remnants.
There is increasing evidence for the clinicial value of the apo lipoprotein measurements. Besides cholesterol in plasma and li poprotein fractions, which is currently used as an indicator of cardiovascular risk, the measurement of the AI and B apolipopro teins can provide additional information about the patients' clinical status. Several studies show that apo B is higher and apo AI is lower in patients with angiographically documented coronary heart dis ease than in symptomatic patients without coronary heart disease. Moreover, discriminant analysis indicated that the concentration of Apo AI and B in plasma are better discriminators than lipo protein cholesterol for identifying patients with coronary heart disease. In some studies the apo Bjapo AI ratio appears to be a more powerful predictor than individual lipoproteins. In a recent study carried out in men, apolipoproteins AI and B were better correlated with the severity of cardiovascular disease than HDL and LDL cholesterol. The predictive power of apolipoproteins could however not be demonstrated in all studies and the value of apolipoprotein measurements in the field of clinical chemistry is still controversial. This is probably due to discrepancies between the results of various studies, arising from differences in the type of immunoassays, the lack of universal reference materials, differ ences between study protocols, variations in the selection of patients and in the grading and interpretation of coronary lesions.
A number of clinical and epidemiological studies have shown that disorders of lipoprotein metabolism constitute one of the most important risk factors for the development of atherosclerosis and coronary heart disease. This volume examines the state of the art of lipoprotein subclass metabolism and its relation to these diseases. The authors also report on new developments concerning the role of lipoprotein recptors, macrophages and apolipoprotein E polymorphism in cholesterol homeostasis. The combination of general outline form and very specific aspects of cholesterol transport will interest those in other disciplines following developments in the field, as well as those directly involved in lipoprotein research.
Lipids are one of the most important biomolecules and, given their relationship with several non-communicable diseases at large, this makes them significant to be studied both biochemically and clinically. As the title of the book suggests, apolipoproteins, triglycerides, and cholesterol are focused herein with fresh perspectives and novel insights, while certain overlooked areas are given their due attention. Although these three terms are very broad, the book aims at primarily serving as an update to existing knowledge. It is hoped that the readers will benefit from this book in advancing their understanding about the biochemical pathways, clinical applications, and remedial action in terms of ensuring health and wellbeing, as well as in identifying gaps that would help set the directions of scientific investigations in the future.
Structure and Function of Apolipoproteins presents a comprehensive review of the primary and secondary structure of apolipoproteins. The book discusses the structure of the apolipoprotein gene family and genetic variation occurring at the protein level. Functional properties of apolipoproteins, including lipid binding, enzyme co-factor activity, antigenic properties, and receptor-ligand interactions are extensively described and analyzed in relation to their structural features. Physiological properties of apolipoproteins and their role in biology and medicine are also examined. Anyone who is interested in apolipoproteins or is conducting research on atherosclerosis should consider this volume an essential reference.