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Unesterified cholesterol-rich lipid particles in atherosclerotic lesions of human and rabbit aortas. 1988

F F Chao, and L M Amende, and E J Blanchette-Mackie, and S I Skarlatos, and W Gamble, and J H Resau, and W T Mergner, and H S Kruth
Laboratory of Experimental Atherosclerosis, National Heart, Lung, and Blood Institute, Bethesda, Maryland.

Unesterified cholesterol-rich lipid particles were isolated from human and cholesterol-fed rabbit aortas. These particles have been previously reported to constitute the initial lipid deposition in atherosclerotic lesion development. Purification of the particles was accomplished with microfiltration, gel filtration chromatography, and density gradient centrifugation. Particles from both human and rabbit aortas had a density of between 1.02 g/ml and 1.08 g/ml with a peak at d = 1.036 g/ml. These particles had a high molar ratio of unesterified cholesterol to phospholipid (2.4:1 in rabbit, 2.6:1 in human) and a high percentage of their cholesterol in an unesterified form (82% in rabbit, 76% in human). The particles had diameters between 700 and 3000 A and showed unilamellar and multilamellar structures. Freeze-fractured particles had smooth fracture faces and sometimes contained a smooth-surfaced core. Upon incubation with filipin, particles showed typical filipin-sterol complexes, demonstrating the presence of unesterified cholesterol. The particles we have isolated may constitute an early pathologic form of accumulated cholesterol in developing lesions and may represent a degradation product of infiltrated plasma low-density lipoprotein.

UI MeSH Term Description Entries
D008055 Lipids A generic term for fats and lipoids, the alcohol-ether-soluble constituents of protoplasm, which are insoluble in water. They comprise the fats, fatty oils, essential oils, waxes, phospholipids, glycolipids, sulfolipids, aminolipids, chromolipids (lipochromes), and fatty acids. (Grant & Hackh's Chemical Dictionary, 5th ed) Lipid
D008297 Male Males
D008854 Microscopy, Electron Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen. Electron Microscopy
D011817 Rabbits A burrowing plant-eating mammal with hind limbs that are longer than its fore limbs. It belongs to the family Leporidae of the order Lagomorpha, and in contrast to hares, possesses 22 instead of 24 pairs of chromosomes. Belgian Hare,New Zealand Rabbit,New Zealand Rabbits,New Zealand White Rabbit,Rabbit,Rabbit, Domestic,Chinchilla Rabbits,NZW Rabbits,New Zealand White Rabbits,Oryctolagus cuniculus,Chinchilla Rabbit,Domestic Rabbit,Domestic Rabbits,Hare, Belgian,NZW Rabbit,Rabbit, Chinchilla,Rabbit, NZW,Rabbit, New Zealand,Rabbits, Chinchilla,Rabbits, Domestic,Rabbits, NZW,Rabbits, New Zealand,Zealand Rabbit, New,Zealand Rabbits, New,cuniculus, Oryctolagus
D002784 Cholesterol The principal sterol of all higher animals, distributed in body tissues, especially the brain and spinal cord, and in animal fats and oils. Epicholesterol
D004036 Diet, Atherogenic A diet that contributes to the development and acceleration of ATHEROGENESIS. Atherogenic Diet,Atherogenic Diets,Diets, Atherogenic
D005614 Freeze Fracturing Preparation for electron microscopy of minute replicas of exposed surfaces of the cell which have been ruptured in the frozen state. The specimen is frozen, then cleaved under high vacuum at the same temperature. The exposed surface is shadowed with carbon and platinum and coated with carbon to obtain a carbon replica. Fracturing, Freeze,Fracturings, Freeze,Freeze Fracturings
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001011 Aorta The main trunk of the systemic arteries. Aortas

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