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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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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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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...
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The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
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Related Experiment Video

Updated: Mar 30, 2026

An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells
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An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells

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MicroRNA-222 Controls Human Pancreatic Cancer Cell Line Capan-2 Proliferation by P57 Targeting.

Yingying Zhao1, Yuqiong Wang2, Yuefeng Yang3

  • 11. Division of Gastroenterology and Hepatology, Digestive Disease Institute, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, China.

Journal of Cancer
|November 5, 2015
PubMed
Summary

MicroRNAs (miRNAs) regulate cell growth in pancreatic cancer. This study shows miR-222 promotes cancer cell proliferation by targeting the p57 gene, offering a potential therapeutic strategy.

Keywords:
Capan-2MiR-222MicroRNAP57.Pancreatic cancerProliferation

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Pancreatic cancer (PC) presents a significant health challenge with poor prognosis due to late detection and limited treatment options.
  • MicroRNAs (miRNAs) are small, non-coding RNAs involved in regulating gene expression and cellular processes.
  • Understanding the role of specific miRNAs in PC pathogenesis is crucial for developing novel therapeutic strategies.

Purpose of the Study:

  • To investigate the role of microRNA-222 (miR-222) in the proliferation of human pancreatic cancer cells.
  • To identify the target genes regulated by miR-222 in pancreatic cancer.
  • To explore the potential of targeting miR-222 as a therapeutic strategy for pancreatic cancer.

Main Methods:

  • Human pancreatic cancer cell line (Capan-2) was transfected with miR-222 mimics and inhibitors.
  • Cell proliferation was assessed using CCK-8 assay, EdU incorporation, and flow cytometry for cell cycle analysis.
  • Gene and protein expression levels of miR-222 and its putative targets (p27, p57, PTEN) were determined by qRT-PCR and Western blotting.

Main Results:

  • Overexpression of miR-222 increased Capan-2 cell proliferation, S-phase, and decreased G1-phase.
  • miR-222 was found to regulate the protein expression of p57, but not p27 or PTEN.
  • Inhibition of miR-222 suppressed Capan-2 cell proliferation, an effect partially reversed by silencing p57.

Conclusions:

  • miR-222 promotes pancreatic cancer cell proliferation by targeting and regulating the p57 gene.
  • Targeting miR-222 presents a potential novel therapeutic approach for pancreatic cancer.
  • Further research into the miR-222/p57 axis could lead to improved treatment strategies for PC patients.