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tangier disease/albumine
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Lipid-free apolipoprotein (apo) A-I is converted into alpha-migrating high density lipoproteins by lipoprotein-depleted plasma of normolipidemic donors and apo A-I-deficient patients but not of Tangier disease patients.
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Plasma of patients with Tangier disease (TD) is devoid of alpha-LpA-I (apolipoprotein A-I-containing lipoprotein), which in normolipidemic plasma constitutes the majority of high density lipoprotein (HDL). The residual amounts of apolipoprotein A-I (apo A-I) in TD plasma have electrophoretic
Defective removal of cellular cholesterol and phospholipids by apolipoprotein A-I in Tangier Disease.
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Tangier disease is a rare genetic disorder characterized by extremely low plasma levels of HDL and apo A-I, deposition of cholesteryl esters in tissues, and a high prevalence of cardiovascular disease. We examined the possibility that HDL apolipoprotein-mediated removal of cellular lipids may be
Plasma and fibroblasts of Tangier disease patients are disturbed in transferring phospholipids onto apolipoprotein A-I.
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Plasmas of patients with Tangier disease (TD) lack lipid-rich alpha-HDL which, in normal plasma, constitutes the majority of high density lipoprotein (HDL). Residual amounts of apolipoprotein (apo)A-I in TD plasma occur as lipid-poor or even lipid-free prebeta-HDL. By contrast to normal plasma, TD
Isolation and characterization of an abnormal high density lipoprotein in Tangier Diesase.
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The nature of the high density lipoproteins has been investigated in five patients homozygous for Tangier disease (familial high density lipoprotein deficiency). It has been established that Tangier high density lipoproteins, as isolated by ultracentrifugation, are morphologically heterogenous and
Human proapolipoprotein A-I: development of an antibody to the propeptide as a probe of apolipoprotein A-I biosynthesis and processing.
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In human plasma, apolipoprotein A-I is present as pro and mature isoproteins. The development of a highly specific antibody to the pro isoprotein of apoA-I has been difficult due to the close structural similarity between the pro and mature isoforms of apoA-I. To sermount this difficulty, a peptide
Cellular cholesterol efflux.
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Efflux of free cholesterol (FC) continues even when cellular FC mass is unchanged. This reflects a recirculation of preformed FC between cells and extracellular fluids which has multiple functions in cell biology including receptor recycling and signaling as well as cellular FC homeostasis. Total FC
Hepatic ABCA1 deficiency is associated with delayed apolipoprotein B secretory trafficking and augmented VLDL triglyceride secretion.
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ATP binding cassette transporter A1 (ABCA1) is a membrane transporter that facilitates nascent HDL formation. Tangier disease subjects with complete ABCA1 deficiency have <5% of normal levels of plasma HDL, elevated triglycerides (TGs), and defective vesicular trafficking in fibroblasts and
Dysregulation of lipid metabolism in Tangier monocyte-derived macrophages.
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The cellular defect in Tangier mononuclear phagocytes (MNP) was shown to be associated with significant abnormalities in cellular phospholipid, triglyceride, and cholesteryl ester metabolism by using various radiolabeled precursors (32Pi, 3H-serine, 3H-choline, 14C-acetate, and 14C-oleic acid).
Transfer of excess cholesterol from human red blood cells to plasma in vitro.
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This study examined the ability of plasma and plasma fractions from normolipidaemic subjects and plasma from a patient with homozygous familial high density lipoprotein deficiency (Tangier disease) to promote loss of excess cholesterol from red blood cells in vitro. Isolated high density
Release of cellular cholesterol: molecular mechanism for cholesterol homeostasis in cells and in the body.
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Most mammalian somatic cells are unable to catabolize cholesterol and therefore need to export it in order to maintain sterol homeostasis. This mechanism may also function to reduce excessively accumulated cholesterol, which would thereby contribute to prevention or cure of the initial stage of
Phospholipid transfer protein enhances removal of cellular cholesterol and phospholipids by high-density lipoprotein apolipoproteins.
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High-density lipoprotein (HDL) apolipoproteins remove excess cholesterol from cells by an active transport pathway that may protect against atherosclerosis. Here we show that treatment of cholesterol-loaded human skin fibroblasts with phospholipid transfer protein (PLTP) increased HDL binding to
Lipid profiling of FPLC-separated lipoprotein fractions by electrospray ionization tandem mass spectrometry.
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Glycerophospholipid and sphingolipid species and their bioactive metabolites are important regulators of lipoprotein and cell function. The aim of the study was to develop a method for lipid species profiling of separated lipoprotein classes. Human serum lipoproteins VLDL, LDL, and HDL of 21 healthy
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