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阐明siRNA细胞传递机制通过四分化粉纳米颗粒介导
Eliz Amar-Lewis1,2, Limor Cohen3, Ramesh Chintakunta2
1Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel.
Small (Weinheim an der Bergstrasse, Germany)
|October 3, 2024
概括
四分化粉纳米颗粒通过内细胞分裂有效地将小干扰RNA (siRNA) 输入细胞. 然而,内体体逃生和复杂分解限制了基因沉默,尽管超声波可以增强分娩效果.
科学领域:
- 生物材料科学 生物材料科学
- 纳米技术 纳米技术
- 药物输送系统 药物输送系统
背景情况:
- 基于粉的纳米颗粒,包括四分化粉 (Q-粉),由于其生物相容性,对药物输送充满希望.
- Q粉通过四元氨基酸促进负电荷的小干扰RNA (siRNA) 通过四元氨基酸复合.
- 对细胞机制的有限理解阻碍了Q-粉/siRNA复合体在基因沉默方面的完全有效性.
研究的目的:
- 阐明四分化粉/siRNA复合物的细胞机制和动力学.
- 为了研究Q-粉/siRNA复合物的细胞内命运和内体逃逸.
- 为了确定Q-粉/siRNA复杂介导基因沉默中的速度限制步骤.
主要方法:
- 单颗粒追踪 (SPT) 用于分析细胞内复杂动态.
- 图像流细胞计用于细胞吸收和命运的细胞群体水平分析.
- 实验操纵来评估内体逃逸和复杂的拆卸.
主要成果:
- Q-粉/siRNA复合体通过内细胞分裂被细胞有效地内化,其中很大一部分被转移到溶酶体.
- 大约15%的内化复合体实现内体逃生,为细胞质基因沉默提供了潜在的潜力.
- 复杂的拆解被确定为速度限制的步骤,归因于强大的Q-粉/siRNA相互作用.
- 低频超声波 (20 kHz) 的应用显示出诱导siRNA释放和加速基因沉默的潜力.
结论:
- Q粉表现出高效的细胞吸收,但在内体体逃逸和及时复杂分解方面面临挑战,以实现最佳的基因沉默.
- 粉和siRNA之间强烈的亲和力,在确保复杂的稳定性同时,阻碍了有效的释放.
- 超声波刺激为克服释放限制和增强Q粉/siRNA介导基因沉默的动力学提供了一个潜在的策略.
相关概念视频
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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
02:15Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...