ปาริชาต นฤพนธ์จิรกุล. Development of Anti-HER2 Targeted Doxorubicin-Core Shell Chitosan Nanoparticles to Treat Human Breast Cancer. Master's Degree(Biological Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library. : King Mongkut's University of Technology Thonburi, 2011.
Development of Anti-HER2 Targeted Doxorubicin-Core Shell Chitosan Nanoparticles to Treat Human Breast Cancer
Abstract:
Doxorubicin (DOX) is one of the most widely used anti-cancer drugs. However, its
application is restrained by dosage limitation, adverse side effects, and toxicity to both
cancer and normal cells. To overcome these limitations, Anti-Her2 targeted
doxorubicin-core shell chitosan nanoparticles are developed to be an effective targeted
drug delivery vehicle for HER2-overexpressing breast cancer cell (MCF-7) treatment.
This biodegradable polymeric immuno-nanoparticles consist of doxorubicin (DOX)
encapsulated O-Succinyl chitosan graft Pluronic'" F127 copolymer nanoparticles
conjugated with Anti-HER2 monoclonal antibodies by using l-ethyl-3-(3dimethylaminopropyl)
carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide
(NHS) mediated cross linking agents. The nanoparticle size is around 24.32 ? 1.24nm to
36.63 ? 1.42 nm and zeta potential ranges from -0.99 ? 0.03 to -0.04 ? 0.26 mY. The
conjugation efficiencies of Anti-HER2-NPs are moderately high (57.35 ? 0.74% to
76.32 ? 0.69%). After conjugated with Anti-HER2, the nanoparticles' average size
increased from 36.01 ? 1.49 to 50.42 ? 1.22 nm, whereas zeta potential range expended
from -0.93 ? 0.24 to 0.53 ? 1.03 mY. The nanoparticles encapsulated doxorubicin either
by adsorption to the nanoparticles' surface or by incorporation into the particle matrix.
The doxorubicin encapsulation efficiency was approximately 74%. From In vitro study,
the nanoparticle formulation exhibited a biphasic drug release with a moderate initial
burst followed by a sustained release profile in both pH 5.0 and pH 7.5. The mouse
fibroblast L929 cell line was selected as a cell model for a biocompatibility test. The
median inhibitory concentration (ICso) of the nanoparticles was 0.9 mg/ml, indicating
that the nanoparticles are biocompatible. To potentiate the anticancer efficiency of the
nanoparticle formation, in vitro cytotoxicity of free doxorubicin, DOX-NPs, and AntiHER2-
DOX-NPs were evaluated on MCF- 7 breast cancer cell lines. IC50 doses,
determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium (MTT) assay,
showed the greater activity of Anti-HER2-DOX-NPs over unconjugated nanoparticles
and free doxorubicin due to higher specificity and cellular uptake on breast cancer cells.
In the, studies of cellular uptake, MCF-7 cells were chosen to be the human breast
cancer model. MCF-7 cells incubated with Anti-HER2-DOX-NPs exhibited more
fluorescence intensity than those incubated with DOX-NPs. Both DOX-NPs and AntiHER2-
DOX-NPs can deliver DOX intracellularly to the cell nucleus of MCF-7 cells in
vitro, even though not as quickly as free DOX. Anti-HER2-DOX-NPs exhibited
enhanced effective cytotoxicity in MCF-7 cells relative to Vero cells. The carriers have
been shown to target mostly cancer cells without damaging normal cells. Therefore,
Anti-HER2-DOX-NPs is promising as an effective targeted drug carrier for cancer
treatment.