【摘 要】
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Many tumor cells specifically overexpress somatostatin receptors, in particular, subtype 2 (SSTR2). Lanreotide, a somatostatin analog with high affinity for SSTR2, can be exploited as a ligand for tum
【机 构】
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State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking Univ
【出 处】
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2011年中国药学大会暨第11届中国药师周
论文部分内容阅读
Many tumor cells specifically overexpress somatostatin receptors, in particular, subtype 2 (SSTR2). Lanreotide, a somatostatin analog with high affinity for SSTR2, can be exploited as a ligand for tumor targeted therapy. In this study, lanreotide was first used to functionalize poly(ethyleneglycol)-poly (ε-caprolactone)(PEG-b-PCL), and the active targeting micelles with paclitaxel (Lanreotide-PM-PTX) or fluorescent agent were developed and characterized with various analytical methods. Two cell lines (NCI-H446 and MCF-7) with different expression level of SSTR2 were selected as cell models. Lanreotide-PM-PTX was spherical in shape with a hydrodynamic diameter of 43.15±0.38nm, high drug loading density (87.1±2.8%) and slow drug release rate. As observed by flow cytometry, confocal microscopy and cytotoxicity studies, lanreotide modified PEG-PCL micelles demonstrated more specific uptake and cytotoxicity in SSTR2-positive tumor cells in vitro over the passive targeting micelles mostly via a receptor-mediated mechanism. The active targeting micelles were found by the near-infrared fluorescence (NIRF) imaging and confocal microscopy to achieve higher accumulation in tumor tissue and tumor cells in vivo, as well as slow elimination in mice. Furthermore, treatment withLanreotide-PM-PTX resulted in superior antitumor efficacy, enhanced tumor cell apoptosis and less body weight loss in SSTR2-overexpressing tumor model in athymic nude mice, as compared with the control groups. In conclusion, lanreotide can serve as an effective homing peptide, and the lanreotide-modified PEG-PCL micelles hold considerable promise in the treatment of SSTR2-overexpressing solid tumors.
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