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Related Concept Videos

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...
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Cancer Detection Using an Artificial Secretable MicroRNA Found in Blood and Urine.

Pei-Wei Shueng1,2, Kuang-Chung Shih3, Sanjiv Sam Gambhir4,5

  • 1Division of Radiation Oncology, Department of Radiology, Far Eastern Memorial Hospital, New Taipei 220, Taiwan.

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Summary

Researchers developed artificial secreted microRNAs (Sec-miRs) as novel cancer biomarkers. These Sec-miRs are detectable in blood and urine, offering a promising tool for early tumor detection and monitoring disease progression.

Keywords:
early cancer detectionliquid biopsymiRNAtumor-activatable

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Cancer Research

Background:

  • Endogenous cancer biomarkers often have low concentrations and unknown production sites, limiting their diagnostic utility.
  • Exogenous or artificial biomarkers offer a potential solution to overcome the limitations of endogenous biomarkers.

Purpose of the Study:

  • To engineer cancer cells to produce artificial secreted microRNAs (Sec-miRs) for use as detectable biomarkers.
  • To evaluate the feasibility of Sec-miRs for early tumor detection and monitoring in vivo.

Main Methods:

  • Cancer cells were engineered to secrete artificial microRNAs (Sec-miRs) by transfecting them with plasmids containing chained Sec-miR sequences.
  • Tumor induction in mice using transfected cell lines and subsequent analysis of Sec-miR levels in plasma and urine.
  • In vivo transfection of tumor-bearing mice with Sec-miR minicircles to assess biomarker detectability and correlation with tumor growth.

Main Results:

  • Sec-miR secretion increased with the number of Sec-miR sequences chained in plasmids.
  • Significantly increased Sec-miR levels were detected in the plasma of mice with growing tumors (p < 0.001).
  • Sec-miR was detected in mouse urine within 12 hours, with levels increasing alongside tumor growth after in vivo minicircle transfection.

Conclusions:

  • Engineered Sec-miRs can be produced by cancer cells and detected in biological fluids.
  • Sec-miRs show potential as sensitive and specific biomarkers for early tumor detection and monitoring.
  • This approach offers a novel strategy for developing in vitro diagnostic tools for cancer management.