Lipids of human leukocytes: relation to celltype - PubMed (original) (raw)
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Lipids of human leukocytes: relation to celltype
E L Gottfried. J Lipid Res. 1967 Jul.
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Abstract
Significant differences in lipid composition have been found between normal human lymphocytes and polymorphonuclear leukocytes (isolated from blood by means of glass-bead columns), abnormal leukocytes from patients with acute and chronic leukemia, and leukocytes from peritoneal exudates. Lipid extracts of isolated leukocytes were analyzed for total lipid, phosphorus, cholesterol, and plasmalogens. Individual phospholipids and neutral lipids were separated by thin-layer chromatography. The major phospholipids were phosphatidyl choline, ethanolamine glycerophosphatides, sphingomyelin, phosphatidyl serine, and phosphatidyl inositol. Plasmalogen was found mainly as phosphatidal ethanolamine. The neutral lipid fractions contained free cholesterol and various amounts of triglyceride, but little esterified cholesterol. Normal lymphocytes contained about half as much total lipid per cell as normal polymorphonuclear leukocytes, with a similar cholesterol:-lipid-P ratio but relatively more lecithin and less ethanolamine glycerophosphatide. Normal mature leukocytes, compared with immature cells of the same morphological series, had a higher total lipid content per cell, more cholesterol, and a higher ratio of cholesterol to lipid-P. Little difference was found in total lipid-P per cell, but mature cells contained relatively less lecithin and more sphingomyelin. These findings may reflect differences in the relative content of various intracellular organelles as well as possible differences in the quantity and composition of the plasma membrane.
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