| Conjugation of Duplexed siRNN Oligonucleotides with DD-HyNic Peptides for Cellular Delivery of RNAi Triggers
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Author:
Date:
2016-04-05
[Abstract] Despite the great promise that short interfering RNA (siRNA) induced RNAi responses hold as a therapeutic modality, due to their size (~15 kDa) and high negative charge (Bumcrot et al., 2006), siRNAs have no bioavailability and require a delivery agent to enter cells (Figure 1). TAT peptide transduction domain (PTD) has been developed as an agent that mediates cellular delivery of macromolecular therapeutics that otherwise lack bioavailability, making it a tantalizing candidate for siRNA delivery (Farkhani et al., 2014). Unfortunately, when conjugated to TAT PTD, the presence of 40 negative phosphodiester backbone charges on siRNA neutralizes the cationic PTD resulting in aggregation and poor cellular delivery (Meade and Dowdy, 2007). In light of this, we synthesized a ...
[摘要] 尽管由于它们的大小（〜15kDa）和高负电荷（Bumcrot等人，2006），短干扰RNA（siRNA）诱导的RNAi反应保持作为治疗模式的巨大希望，siRNA没有生物利用度，需要递送剂进入细胞（图1）。 TAT肽转导结构域（PTD）已经被开发为介导大分子治疗剂的细胞递送的药剂，否则其缺乏生物利用度，使其成为siRNA递送的诱人候选物（Farkhani等人，2014）。不幸的是，当缀合到TAT PTD时，siRNA上40个负磷酸二酯主链电荷的存在中和了导致聚集和差的细胞递送的阳离子PTD（Meade和Dowdy，2007）。鉴于此，我们合成了称为siRibo核中性的中性RNAi触发物，用于与TAT PTD缀合（Meade等人，2014）。简言之，带负电荷的磷酸二酯主链通过具有生物可逆磷酸三酯保护基团的合成来中和，其通过细胞质限制性硫酯酶的作用特异性地转化为细胞内的带电磷酸二酯键，产生可诱导RNAi应答的野生型siRNA。在这里我们描述了与TAT PTD递送结构域（DD）HyNic肽的siRNN寡核苷酸的缀合和细胞递送。
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| PhagoKinetic Track Assay: Imaging and Analysis of Single Cell Migration
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Author:
Date:
2016-01-05
[Abstract] Cell migration is a highly complex and dynamic biological process, essential in several physiological phenomena and pathologies including cancer dissemination and metastasis formation. Thus understanding single cell migration is highly relevant and requires a suitable image-based assay. Depending on the speed of the moving cells, one may require fast time-lapse microscopy, which is not always suitable for high-throughput screening. To overcome this, a quantitative and fixed single cell migration assay was developed based on the PhagoKinetic Tracks (PKT) procedure. Briefly, cells are seeded on top of a monolayer of carboxylated latex beads, and as cells migrate, they phagocytose these beads and leave behind a migratory track. These bead-free migratory tracks can be visualized using a ...
[摘要] 细胞迁移是高度复杂和动态的生物过程，在几种生理现象和病理包括癌症传播和转移形成中是必需的。因此，理解单细胞迁移是高度相关的，并需要合适的基于图像的测定。根据移动细胞的速度，可能需要快速时间延迟显微术，这不总是适合于高通量筛选。为了克服这一点，基于Phago运动轨迹（PKT）程序开发了定量和固定的单细胞迁移测定。简言之，将细胞接种在单层羧化的乳胶珠的顶部，并且当细胞迁移时，它们吞噬这些珠并留下迁移轨迹。这些无珠移动轨迹可以使用标准明场显微镜可视化，并分析单细胞迁移的多参数定量评估（Naffar-Abu-Amara等人，2008）。
在这里，我们描述了PKT测定的详细和优化的方案，适用于RNAi和药物筛选（van Roosmalen等人，2015）。这个协议允许用户在单细胞水平研究迁移行为，没有快速和活成像显微镜。
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| RNA Isolation and Northern Blot Analysis
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Author:
Date:
2014-03-20
[Abstract] The northern blot is a technique used in molecular biology research to study gene expression by detection of RNA in a sample. With northern blotting it is possible to observe particular gene expression levels during differentiation, morphogenesis, as well as abnormal or diseased conditions. Here, we examine ATF3, ATF4, and GADD153 gene expression profiles by northern blot in Vero cells and H1299 cells after IBV infection. RNA was extracted in IBV (infectious bronchitis virus) infected cells and electrophoresis was used to separate the RNA sample. RNA was transferred from the electrophoresis gel to the blotting membrane by capillary transfer. Specific mRNA was detected with hybridization probes complementary to part of target sequence. The probes were prepared by RT-PCR and labeled by ...
[摘要] Northern印迹是在分子生物学研究中用于通过检测样品中的RNA来研究基因表达的技术。 使用Northern印迹，可以在分化，形态发生以及异常或疾病状况期间观察到特定的基因表达水平。 在这里，我们检查ATF3，ATF4和GADD153基因表达谱通过北部污点在Vero细胞和H1299细胞后IBV感染。 在IBV（感染性支气管炎病毒）感染的细胞中提取RNA，并使用电泳分离RNA样品。 通过毛细管转移将RNA从电泳凝胶转移到印迹膜上。 使用与靶序列的一部分互补的杂交探针检测特异性mRNA。 通过RT-PCR制备探针，并使用DIG标记试剂盒通过地高辛（DIG）标记。
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