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Updated: Aug 28, 2025

An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells
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From Molecular Mechanisms to Therapeutics: Understanding MicroRNA-21 in Cancer

Jiho Rhim1,2, Woosun Baek1,2, Yoona Seo1,2

  • 1Cancer Molecular Biology Branch, Division of Cancer Biology, Research Institute, National Cancer Center, Goyang 10408, Korea.

Cells
|September 23, 2022
PubMed

Insights

MicroRNA-21 (miR-21) is a key regulator in many cancers, impacting processes from stemness to cell death. Its elevated expression and detectability in biofluids highlight its potential as a diagnostic biomarker and therapeutic target.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) are small noncoding RNAs regulating gene expression posttranscriptionally.
  • MicroRNA-21 (miR-21) is an oncogenic miRNA implicated in numerous cancers, including glioblastoma and lung cancer.
  • miR-21 influences critical cellular processes like cancer stemness and cell death.

Purpose of the Study:

  • To review the multifaceted roles of miR-21 in various cancer types.
  • To explore the potential of miR-21 as a therapeutic target in oncology.
  • To highlight miR-21's utility as a biomarker for cancer diagnosis and prognosis.

Main Methods:

  • Literature review of studies on miR-21 function in cancer.
  • Analysis of miR-21 expression patterns in tumor tissues and biofluids.
  • Examination of current and emerging RNA-based therapeutic strategies targeting miR-21.

Main Results:

  • miR-21 is overexpressed in diverse cancer tissues and detectable in circulating biofluids.
  • miR-21 targets multiple genes involved in cancer development and progression.
  • Elevated miR-21 levels correlate with cancer diagnosis and prognosis.

Conclusions:

  • miR-21 is a significant modulator of cancer biology with broad implications.
  • The detectability of miR-21 in biofluids supports its use as a promising cancer biomarker.
  • Targeting miR-21 represents a viable strategy for novel cancer therapeutics.
Keywords:
RNA therapeuticsbiomarkercancermicroRNA-21noncoding RNA

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