ISOLATION AND PARTIAL CHARACTERIZATION OF GLYCOLIPIDS AND A CARBOHYDRATE FROM THE SECONDARY GRANULES AND PLASMA-MEMBRANE OF POLYMORPHONUCLEAR LEUKOCYTES

Chloroform/methanol extracts of the secondary granule and plasma membrane fractions of polymorphonuclear leukocytes have been shown to contain both non-polar and polar carbohydrate-containing materials. The ratio of the polar to the non-polar material was much higher in the plasma membrane than the secondary granule fraction. The non-polar material contains at least two ceramide-like glycolipids and accounts for most of the broad band of periodic acid/Schiff-positive material which migrates at the dye front in sodium dodecyl sulfate electrophoretic gels of granule and plasma membrane extracts. The polar material appears to be a single substance containing no fatty acids or sialic acid and is composed of glucose, hexosamine and a carboxylic acid derivative of pentose. Expressed on a per mg of protein basis, the amount of carbohydrate associated with the polar material in the plasma membrane fraction was about five times that of the secondary granule fraction. © 1979.