title: Electron microscopic demonstration of the interaction of liposomes and cells in vitro.
abstract: We have investigated the interaction of liposomes with the continuous cell lines P388D1 and L-132 and mouse peritoneal macrophages. To distinguish the liposomes from other vesicular structures, we have used liposomes with incorporated protein G and gold. A heterogeneous mixture of multilamellar liposomes 30 nm up to 1000 nm in size has been employed. Samples were examined at different time intervals. We found differences in the uptake of liposomes with regard to size and rate. Cells of a P388D1 monolayer took up liposomes by endocytosis very early after addition of liposomes and the number of lysosomes in their cytoplasm increased. In L-132 cells, first a fusion occurred between liposomes and the cell cytoplasmic protrusions, in the cytoplasm of which the mitochondria had multiplied. Peritoneal macrophages phagocytosed mainly large multilamellar liposomes and the membranous system of Golgi apparatus was the most prominent structure in the cytoplasm. Phagocytosis in P388D1 and L-132 cells was noted sporadically as late as 24 h after addition of liposomes to the cells.
authors.affiliation: National Institute of Public Health, Prague, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Schramlová
authors.forename: K
authors.initials: K
authors.lastname: Blazek
authors.forename: V
authors.initials: V
authors.lastname: Danielová
authors.forename: M
authors.initials: M
authors.lastname: Bartácková
authors.forename: J
authors.initials: J
authors.lastname: Holubová
authors.forename: B
authors.initials: B
authors.lastname: Otová
authors.forename: D
authors.initials: D
authors.lastname: Hulínská
mesh_terms: D000818:Animals; D002460:Cell Line; D003593:Cytoplasm / Q000378:metabolism; D006046:Gold / Q000378:metabolism; D006056:Golgi Apparatus / Q000648:ultrastructure; D006801:Humans; D008081:Liposomes / Q000378:metabolism*; D008168:Lung / Q000166:cytology / Q000196:embryology; D017737:Macrophages, Peritoneal / Q000378:metabolism* / Q000648:ultrastructure; D051379:Mice; D008807:Mice, Inbred BALB C; D008854:Microscopy, Electron / Q000379:methods*; D009419:Nerve Tissue Proteins / Q000378:metabolism; D010587:Phagocytosis; D013997:Time Factors; D014617:Vacuoles / Q000378:metabolism
chemical_list: C029152:G-substrate; D008081:Liposomes; D009419:Nerve Tissue Proteins; D006046:Gold