Phagocytosis Of Carbohydrate-Modified Phospholipid Vesicles by Macrophage

• Published in: Proceedings of the National Academy of Sciences - PNAS Vol. 78; no. 4; pp. 2033 - 2037
• Main Authors: Wu, Po-shun, Tin, George W., Baldeschwieler, John D.
• Format: Journal Article
• Language: English
• Published: United States National Academy of Sciences of the United States of America 01-04-1981; National Acad Sciences
• Subjects: Animals; Ascitic Fluid - cytology; Chloroquine - pharmacology; Cholesterol; Cholesterols; Colchicine - pharmacology; Cytochalasin B - pharmacology; Cytochalasins; Endocytosis; Glycolipids; Liposomes; Macrophages; Macrophages - physiology; Mice; Peritoneal macrophages; Phagocytosis; Phagocytosis - drug effects; Phospholipids; Receptors; Transition temperature
• ISSN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.78.4.2033

Modification of the surface of distearoyl phosphatidylcholine vesicles with synthetic glycolipids dramatically affects the rate of uptake of these vesicles by mouse peritoneal macrophage. The high rate of uptake of 6-aminomannose-modified vesicles is effectively inhibited by cytochalasin B and chloroquine but not by colchicine, indicating that the mechanism of vesicle uptake is phagocytosis. Other modified vesicles appear to have some effect on the rate of uptake of 6-aminomannose-modified vesicles suggesting that the various vesicle types compete for the same initial binding sites. Analysis of 6-aminomannose-modified vesicles by γ -ray perturbed angular correlation spectroscopy shows that the rotational correlation time of the encapsulated111In3+does not change when the vesicles associate with macrophage. This result is consistent with transmission electron microscopy, which indicates that the aminomannose-modified vesicles remain intact after phagocytosis as aggregates of fused and intact vesicles surrounded by a single bilayer membrane structure.