Sterically stabilized anti-idiotype immunoliposomes improve the therapeutic efficacy of doxorubicin in a murine B-cell lymphoma model
Journal
International Journal of Cancer
Journal Volume
80
Journal Issue
5
Pages
723-730
Date Issued
1999
Author(s)
Abstract
A liposome containing diverse synthetic lipid derivatives of polyethylene glycol (PEG) results in smaller distribution volume and longer circulation time in blood and, thus, may improve drug targeting. The characteristics and therapeutic efficacy of immunoliposomes with similar liposomal formulation have never been studied in lymphoma models. We have developed immunoliposomes conjugated with S5A8 monoclonal antibody, an anti- idiotype antibody to 38C13 murine B-cell lymphoma, and loaded them with doxorubicin using an ammonium sulfate gradient. Purified antibodies were covalently coupled to the termini of PEG on the surface of small unilamellar liposomes. Cell binding and internalization ability of these immunoliposomes were estimated by a fluorescence assay using a pH-sensitive fluorescent dye (HPTS). The in vitro cytotoxicity of doxorubicin encapsulated in immunoliposomes was greater for idiotype-positive 38C13 cells than for the idiotype-negative variant of this cell line. In syngeneic C3H/HeN mice, doxorubicin encapsulated in immunoliposomes exhibited a long circulation time and was more effective at prolonging survival of mice bearing 38C13 tumor than non-targeted liposomal doxorubicin or free doxorubicin plus empty immunoliposomes. Our results demonstrate the superiority of targeted therapy with these immunoliposomes and its potential in lymphoma treatment.
SDGs
Other Subjects
doxorubicin; animal cell; animal model; article; b cell lymphoma; cancer chemotherapy; distribution volume; drug delivery system; drug efficacy; drug stability; drug targeting; female; male; mouse; nonhuman; priority journal; Animals; Antibodies, Anti-Idiotypic; Antibodies, Monoclonal; Doxorubicin; Drug Carriers; Endocytosis; Female; Liposomes; Lymphoma, B-Cell; Male; Metabolic Clearance Rate; Mice; Mice, Inbred C3H; Phosphatidylethanolamines; Polyethylene Glycols
Type
journal article