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相关概念视频

MicroRNAs01:22

MicroRNAs

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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...
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Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
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相关实验视频

Updated: Jul 24, 2025

Detection of miRNA Targets in High-throughput Using the 3'LIFE Assay
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调节ecto-5'-核酸酶表达的新型微RNA.

Theresa Kordaß1,2, Tsu-Yang Chao1, Wolfram Osen1

  • 1GMP & T Cell Therapy Unit, German Cancer Research Center (DKFZ), Heidelberg, Germany.

Frontiers in immunology
|July 6, 2023
PubMed
概括

这项研究确定了在癌细胞中调节免疫检查点分子 (ICM) 的microRNAs (miRNAs),如NT5E. 一些miRNA抑制ICM,可能充当瘤抑制剂,而另一些则促进ICM,充当瘤基因.

关键词:
CD274 是一个CD274在 ENTPD1 中.土耳其人土耳其人土耳其人 NT5E/CD73乳腺癌 乳腺癌 乳腺癌黑色素瘤是一种黑色素瘤.这就是miRNAs.

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科学领域:

  • 在瘤学瘤学.
  • 分子生物学分子生物学
  • 免疫学 免疫学 免疫学

背景情况:

  • 癌细胞上的免疫检查点分子 (ICM) 通过抑制抗瘤免疫反应,促进免疫逃脱.
  • 埃克托-5'-核酶 (NT5E/CD73) 上调免疫抑制性腺素,阻碍T细胞介导的瘤攻击.
  • 微RNAs (miRNAs) 是基因表达的关键调节者,它们在癌症中的异常配置文件提供了诊断和治疗潜力.

研究的目的:

  • 确定特定的miRNAs调节人类癌症细胞系中关键免疫检查点分子 (ICM) 的表达.
  • 描述抑制或增强ICM表达的miRNAs,定义潜在的瘤抑制剂和瘤基因.
  • 为了验证miRNA介导的ICM调节在多种瘤类型中的发现.

主要方法:

  • 针对黑色素瘤 (SK-Mel-28) 和乳腺癌 (MDA-MB-231) 细胞系的人类miRNA库的高通量查.
  • 评估已识别的miRNAs对NT5E,ENTPD1和CD274.4的表达的影响.
  • 在体外验证miRNA对12个不同癌细胞系NT5E表达的影响.

主要成果:

  • 确定了miR-1285-5p,miR-155-5p和miR-3134作为NT5E表达的强有力的抑制剂.
  • 发现了miR-134-3p,miR-6859-3p,miR-6514-3p和miR-224-3p作为NT5E表达的强增强剂.
  • 证实了这些miRNA在各种癌症细胞系中NT5E表达中的调节作用.

结论:

  • 已识别的miRNA具有作为针对癌症ICM的治疗剂的潜力.
  • 这些miRNA可以作为早期癌症检测或预后的有价值的生物标志物.
  • 特定的miRNAs可以在治疗上向调节ICM并增强抗瘤免疫力.