title: Enhanced tumor visualization by gamma-scintigraphy with 111In-labeled polychelating-polymer-containing immunoliposomes.
abstract: Here, we have prepared long-circulating PEGylated liposomes heavily loaded with 111In via the liposome-incorporated polylysine-based (PLL-based) polychelating amphiphilic polymer (PAP) and additionally modified with the monoclonal antibody 2C5 (mAb 2C5) possessing the nucleosome-restricted (NS-restricted) specificity and capable of specific recognition of a broad variety of live cancer cells via the cancer cell surface bound NSs. These liposomes have been tested as a tumor-specific contrast agent for the gamma-scintigraphic visualization of model tumors in mice. The tumor accumulation of mAb 2C5 modified liposomes prepared in this study was significantly (3-to-5-fold) higher than in the neighboring muscle tissue at all times after administration (6, 24, and 48 h) in mice bearing murine Lewis lung carcinoma (LLC) and human HT-29 tumors. The whole body direct gamma-imaging of LLC tumor bearing mice at different times has demonstrated the superior in vivo tumor accumulation of the targeted mAb 2C5 modified PAP-containing PEGylated liposomes compared to nontargeted liposomal control formulations, which resulted in better and faster tumor imaging as shown with LLC-bearing mice.
authors.affiliation: Department of Pharmaceutical Sciences, School of Pharmacy, Northeastern University, Boston, Massachusetts 02115, USA.
authors.forename: Suna
authors.initials: S
authors.lastname: Erdogan
authors.forename: Aruna
authors.initials: A
authors.lastname: Roby
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Torchilin
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000493:pharmacokinetics; D018827:Carcinoma, Lewis Lung / Q000000981:diagnostic imaging* / Q000276:immunology / Q000378:metabolism; D002614:Chelating Agents / Q000737:chemistry*; D007205:Indium Radioisotopes; D008081:Liposomes / Q000737:chemistry / Q000276:immunology / Q000493:pharmacokinetics*; D051379:Mice; D011108:Polymers / Q000737:chemistry*; D011877:Radionuclide Imaging / Q000379:methods; D013997:Time Factors
chemical_list: D000911:Antibodies, Monoclonal; D002614:Chelating Agents; D007205:Indium Radioisotopes; D008081:Liposomes; D011108:Polymers