Uptake and intracellular fate of cholera toxin subunit b-modified mesoporous silica nanoparticle-supported lipid bilayers (aka protocells) in motoneurons.

Uptake and intracellular fate of cholera toxin subunit b-modified mesoporous silica nanoparticle-supported lipid bilayers (aka protocells) in motoneurons.
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DOI:
10.1016/j.nano.2018.01.002
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发表时间:
2018-04
期刊:
Nanomedicine : nanotechnology, biology, and medicine
影响因子:
--
通讯作者:
Mantilla CB
Mantilla CB
中科院分区:
其他
文献类型:
--
作者:
Gonzalez Porras MA;Durfee P;Giambini S;Sieck GC;Brinker CJ;Mantilla CB

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霍乱毒素B(CTB)修饰的介孔二氧化硅纳米颗粒支持的脂质双层(CTB-原细胞)是一种有前途的、可定制的将治疗性货物靶向运动神经元的方法。在本研究中,CTB-原细胞在运动神经元的内吞机制和细胞内的命运进行了检查,以提供信息的治疗应用和货物输送的发展。药理学抑制剂阐明CTB-原始细胞内吞作用依赖于脂筏和巨胞饮作用的完整性。使用免疫荧光技术,活的共聚焦和透射电子显微镜,CTB-protocells主要被发现在胞质溶胶,膜脂质结构域和高尔基体。在神经肌肉接头中CTB-原细胞的运动神经元活性依赖性摄取量没有差异,这与低频活动期间轴突末端的网格蛋白激活一致。总之,CTB-原细胞摄取主要由脂筏和巨胞饮介导。一旦内化,CTB-原细胞逃避溶酶体降解,并参与不容易通过非靶向递送方法进入的生物途径。
Cholera toxin B (CTB) modified mesoporous silica nanoparticle supported lipid bilayers (CTB-protocells) are a promising, customizable approach for targeting therapeutic cargo to motoneurons. In the present study, the endocytic mechanism and intracellular fate of CTB-protocells in motoneurons was examined to provide information for the development of therapeutic application and cargo delivery. Pharmacological inhibitors elucidated CTB-protocells endocytosis to be dependent on the integrity of lipid rafts and macropinocytosis. Using immunofluorescence techniques, live confocal and transmission electron microscopy, CTB-protocells were primarily found in the cytosol, membrane lipid domains and Golgi. There was no difference in the amount of motoneuron activity dependent uptake of CTB-protocells in neuromuscular junctions, consistent with clathrin activation at the axon terminals during low frequency activity. In conclusion, CTB-protocells uptake is mediated principally by lipid rafts and macropinocytosis. Once internalized, CTB-protocells escape lysosomal degradation, and engage biological pathways that are not readily accessible by untargeted delivery methods.
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