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Breast Cancer Photothermal Therapy Based On Gold Nanorods Targeted By Covalently-coupled Bombesin Peptide.

Zahra Heidari, M. Salouti, R. Sariri
Published 2015 · Materials Science, Medicine

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Photothermal therapy, a minimally invasive treatment method for killing cancers cells, has generated a great deal of interest. In an effort to improve treatment efficacy and reduce side effects, better targeting of photoabsorbers to tumors has become a new concept in the battle against cancer. In this study, a bombesin (BBN) analog that can bind to all gastrin-releasing peptide (GRP) receptor subtypes was bound covalently with gold nanorods (GNRs) using Nanothinks acid as a link. The BBN analog was also coated with poly(ethylene glycol) to increase its stability and biocompatibility. The interactions were confirmed by ultraviolet-visible and Fourier transform infrared spectroscopy. A methylthiazol tetrazolium assay showed no cytotoxicity of the PEGylated GNR-BBN conjugate. The cell binding and internalization studies showed high specificity and uptake of the GNR-BBN-PEG conjugate toward breast cancer cells of the T47D cell line. The in vitro study revealed destruction of the T47D cells exposed to the new photothermal agent combined with continuous-wave near-infrared laser irradiation. The biodistribution study showed significant accumulation of the conjugate in the tumor tissue of mice with breast cancer. The in vivo photothermal therapy showed the complete disappearance of xenographted breast tumors in the mouse model.
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