相关实验视频
Updated: May 10, 2026

12:49
Detection of miRNA Targets in High-throughput Using the 3'LIFE Assay
Published on: May 25, 2015
林28A和林28B通过不同的机制抑制let-7微RNA生物发生
Elena Piskounova1, Christos Polytarchou, James E Thornton
1Stem Cell Program, Children's Hospital, Boston, MA 02115, USA.
Cell
|November 29, 2011
概括
林28A和林28B瘤基因抑制癌症中的let-7微RNA. 林28A在细胞质中使用Zcchc11,而林28B在细胞核中独立作用,提供不同的治疗点.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 基因规则 基因规则
背景情况:
- 林28A和林28B是抑制let-7微RNA表达的瘤基因.
- 林28A招募Zcchc11 (TUT4) 来阻止Dicer在细胞质中的let-7前体处理.
- 林28A和林28B在癌症中的不同作用和机制尚未完全理解.
研究的目的:
- 阐明Lin28A和Lin28B抑制let-7微RNA处理的独特机制.
- 研究这些独特机制在人类癌症中的功能后果.
- 探索针对Lin28A和Lin28B通路的治疗影响.
主要方法:
- 研究了Lin28B的let-7抑制机制,并将其与Lin28A进行了比较.
- 评估Zcchc11耗尽对癌细胞瘤性和转移 in vitro 和 in vivo 的影响.
- 在人类乳腺和结肠瘤中分析了Lin28A和Lin28B的表达模式.
主要成果:
- 林28B通过Zcchc11独立的核机制抑制了let-7处理,封存了主要的let-7转录.
- Zcchc11 枯竭的抗瘤作用是特定于表达Lin28A的瘤的.
- 人类瘤主要表达Lin28A (在HER2阳性乳腺癌中) 或Lin28B (在三阴性乳腺癌中).
结论:
- 林28A和林28B采用不同的机制来调节let-7微RNA,其中林28A通过Zcchc11通过细胞质作用,而林28B通过Zcchc11独立于核作用.
- 在特定癌症亚型中,这些独特的机制和表达模式对开发向癌症治疗有重大影响.
- 了解这些差异对于设计针对Lin28驱动癌症的有效治疗策略至关重要.
相关概念视频
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
Experimental 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...
MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...

