Wu Feng-Lei, Zhang Jian, Li Wei, Bian Bao-Xiang, Hong Yi-Dong, Song Zi-Yan, Wang Hui-Yu, Cui Fang-Bo, Li Ru-Tian, Liu Qin, Jiang Xiao-Dong, Li Xiao-Min, Zheng Jun-Nian
Department of Onology, Affiliated Lianyungang Hospital of Xuzhou Medical University, Lianyungang, Jiangsu 222000, China.
Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu 221002, China.
Oncotarget. 2017 May 22;8(40):67189-67202. doi: 10.18632/oncotarget.18066. eCollection 2017 Sep 15.
MiR-21 is an oncogenic miR frequently elevated in gastric cancer. Overexpression of miR-21 decreases the sensitivity of gastric cancer cells to trastuzumab, which is a humanized monoclonal antibody targeting human epidermal growth factor receptor 2. However, optimization of miRNA or its anti-miRNA oligonucleotides (AMOs) for delivery is a challenge. Receptor-mediated endocytosis plays a crucial role in the delivery of biotherapeutics including AMOs. This study is a continuation of our earlier findings involving poly(ε-caprolactone) (PCL)-poly (ethylene glycol) (PEG) nanoparticles (PEG-PCL NPs), which were coated with trastuzumab to target gastric cancer cells with HER2 receptor over-expression using anti-miRNA-21 antisense oligonucleotides (AMO-21). The antibody conjugates (HER-PEG-PCL NPs) act against target cells via antibody-dependent mechanisms and also based on encapsutalated AMO-21. X-ray photoelectron spectroscopy validated the presence of trastuzumab on NP surface. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) revealed a stable antibody expression. The cell line specificity, cellular uptake, AMO-21 delivery, and cytotoxicity of the HER-PEG-PCL NPs were investigated. We found that the antibody conjugates significantly enhanced the cellular uptake of NPs. The HER-PEG-PCL NPs effectively suppressed the target miRNA expression in gastric cancer cells, which further up-regulated phosphatase and tensin homolog (PTEN). As a result, the sensitivity of HER2-expressing gastric cancer cells to trastuzumab was enhanced. The approach enhances the targeting by trastuzumab as well as antibody-dependent cellular cytotoxicity of immune effector cells. The antitumor effects of AMO-21-HER-PEG-PCL NPs were compared with trastuzumab in xenograft gastric cancer mice. The results provide insight into the biological and clinical potential of targeted AMO-21 delivery using modified trastuzumab for gastric cancer treatment.
微小RNA-21(miR-21)是一种在胃癌中经常上调的致癌性微小RNA。miR-21的过表达会降低胃癌细胞对曲妥珠单抗的敏感性,曲妥珠单抗是一种靶向人表皮生长因子受体2的人源化单克隆抗体。然而,优化用于递送的微小RNA或其抗微小RNA寡核苷酸(AMO)是一项挑战。受体介导的内吞作用在包括AMO在内的生物治疗药物的递送中起着关键作用。本研究是我们早期关于聚(ε-己内酯)(PCL)-聚(乙二醇)(PEG)纳米颗粒(PEG-PCL NPs)研究的延续,这些纳米颗粒用曲妥珠单抗包被,以使用抗微小RNA-21反义寡核苷酸(AMO-21)靶向过表达HER2受体的胃癌细胞。抗体偶联物(HER-PEG-PCL NPs)通过抗体依赖性机制以及基于包裹的AMO-21作用于靶细胞。X射线光电子能谱验证了曲妥珠单抗在纳米颗粒表面的存在。十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)显示抗体表达稳定。研究了HER-PEG-PCL NPs的细胞系特异性、细胞摄取、AMO-21递送和细胞毒性。我们发现抗体偶联物显著增强了纳米颗粒的细胞摄取。HER-PEG-PCL NPs有效抑制了胃癌细胞中靶微小RNA的表达,进而上调了磷酸酶和张力蛋白同源物(PTEN)。结果,表达HER2的胃癌细胞对曲妥珠单抗的敏感性增强。该方法增强了曲妥珠单抗的靶向作用以及免疫效应细胞的抗体依赖性细胞毒性。在异种移植胃癌小鼠中比较了AMO-21-HER-PEG-PCL NPs与曲妥珠单抗的抗肿瘤作用。结果为使用修饰的曲妥珠单抗靶向递送AMO-21用于胃癌治疗的生物学和临床潜力提供了见解。
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