title: In situ activation of mouse alveolar macrophages by aerosolized liposomal IFN-gamma and muramyl tripeptide.
abstract: Interferon-gamma (IFN-gamma) was entrapped with an efficiency of 30-40% in muramyl tripeptide-containing liposomes by a freeze-thawing procedure. A microcytotoxicity assay was developed to measure the tumoricidal activity of mouse alveolar macrophages (AM) against tumoral target cells with a colorimetric viability test. Free IFN-gamma and liposomal muramyl tripeptide phosphatidylethanolamine (MTP-PE) were found to be only slightly effective to activate in vitro AM, whereas encapsulation of both INF-gamma and MTP-PE within the same liposomes produced higher activation of AM. Aerosolized IFN-gamma and liposomal immunomodulators enhanced antitumor properties of AM recovered in mice 24 h postinhalation. Whereas free IFN-gamma also induced a substantial activation of peritoneal macrophages, liposomal encapsulation significantly reduced the systemic activity of inhaled immunomodulators. This approach provides a useful model for the compartmentalized organ-specific activation of AM in mice.
authors.affiliation: Laboratoire de Pharmacotechnie, Université Louis Pasteur, Strasbourg, France.
authors.forename: P
authors.initials: P
authors.lastname: Goldbach
authors.forename: S
authors.initials: S
authors.lastname: Dumont
authors.forename: R
authors.initials: R
authors.lastname: Kessler
authors.forename: P
authors.initials: P
authors.lastname: Poindron
authors.forename: A
authors.initials: A
authors.lastname: Stamm
mesh_terms: D000119:Acetylmuramyl-Alanyl-Isoglutamine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology; D000336:Aerosols; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D004337:Drug Carriers; D007371:Interferon-gamma / Q000008:administration & dosage / Q000494:pharmacology*; D007700:Kinetics; D008081:Liposomes; D008175:Lung Neoplasms; D008262:Macrophage Activation / Q000187:drug effects*; D016676:Macrophages, Alveolar / Q000187:drug effects / Q000276:immunology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D010714:Phosphatidylethanolamines / Q000494:pharmacology; D011994:Recombinant Proteins; D014407:Tumor Cells, Cultured
chemical_list: D000336:Aerosols; D000970:Antineoplastic Agents; D004337:Drug Carriers; D008081:Liposomes; D010714:Phosphatidylethanolamines; D011994:Recombinant Proteins; C037144:mifamurtide; D000119:Acetylmuramyl-Alanyl-Isoglutamine; C035104:muramylNAc-Ala-isoGln-Lys-tripeptide; D007371:Interferon-gamma