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Surface-modified poly(lactide-co-glycolide) nanospheres for targeted bone imaging with enhanced labeling and delivery of radioisotope

Title
Surface-modified poly(lactide-co-glycolide) nanospheres for targeted bone imaging with enhanced labeling and delivery of radioisotope
Authors
Park, YJNah, SHLee, JYJeong, JMChung, JKLee, MCYang, VCLee, SJ
Ewha Authors
이승진
SCOPUS Author ID
이승진scopus
Issue Date
2003
Journal Title
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
ISSN
0021-9304JCR Link
Citation
vol. 67A, no. 3, pp. 751 - 760
Keywords
polymer nanospheresPoloxamer 407radioisotope carrierbone and bone marrow targetingimaging
Publisher
WILEY-LISS
Indexed
SCOPUS WOS scopus
Abstract
Surface-modified nanospheres can be utilized for targeting drugs and diagnostic agents to the bone and bone marrow while extending their circulation time in the blood stream. The surface modification of poly(lactide-co-glycolide) (PLGA) nanospheres by radioisotope carrying poly(ethylene oxide)-poly (propylene oxide)-poly (ethylene oxide) triblock copolymers (Poloxamer 407) has been assessed by in vitro characterization and in vivo biodistribution studies after intravenous administration of the nanospheres to the mouse. A hydroxyphenylpropionic acid, a ligand for I-125 and I-131 labeling, was conjugated to the hydroxyl group of the Poloxamer 407 by using dicyclohexyl carbodiimide. The ligand-conjugated Poloxamer 407 was adsorbed onto the surface of PLGA nanospheres. Surface coating was confirmed by measuring both size distribution and the surface charge of the nanospheres. Besides, I-125-labeling efficiency, radiolabeling stability, whole body imaging, and biodistribution of the radioisotope-labeled nanospheres were examined. Ligand-labeled, surface-modified PLGA nanospheres were in 100-nm size ranges, which may be adequate for long-circulation and further bone imaging. I-125-labeling efficiency was >90% and was more stable at human serum for 24 h. A noticeable decrease in liver or spleen uptake was obtained by the surface-modified nanospheres. I-125-labeled nanospheres showed higher blood maintenance and bone uptake compared with stannous colloid with the same size distribution. Therefore, a fully biodegradable, radioisotope-carrying, surface-modified nanosphere system has been developed as a promising tool for targeting bone and bone marrows. (C) 2003 Wiley Periodicals, Inc.
DOI
10.1002/jbm.a.10167
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약학대학 > 약학과 > Journal papers
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