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Updated: Oct 22, 2025

Clinicopathological Analysis of miRNA Expression in Breast Cancer Tissues by Using miRNA In Situ Hybridization
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In situ Hybridization (ISH) and Quantum Dots (QD) of miRNAs

Sajni Josson1,2, Murali Gururajan1,3, Leland W K Chung1

  • 1Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, USA.

Bio-Protocol
|August 30, 2021
PubMed

Insights

This study introduces quantum dot (QD) technology combined with in situ hybridization (ISH) for simultaneously detecting multiple microRNAs (miRNA) in tissue sections. This method offers powerful diagnostic and prognostic potential for various diseases.

Area of Science:

  • Molecular Biology
  • Biotechnology
  • Oncology

Background:

  • MicroRNAs (miRNA) are short non-coding RNA molecules that regulate gene expression and are implicated in oncogenesis.
  • Current methods for miRNA detection include real-time PCR, but visualizing their spatial distribution in tissues is challenging.
  • miRNAs serve as crucial biomarkers for various disease states, necessitating accurate visualization and quantification in clinical specimens.

Purpose of the Study:

  • To develop and describe a novel method for simultaneous, multiplexed detection and visualization of microRNAs (miRNA) in tissue sections.
  • To leverage the advantages of quantum dots (QD) for enhanced sensitivity and multiplexing capabilities in miRNA imaging.
  • To establish a powerful tool for the diagnostic and prognostic assessment of miRNA expression in pathological tissues.

Main Methods:

  • Development of an in situ hybridization coupled with quantum dot (ISH-QD) assay for miRNA detection.
  • Utilizing biotin-labeled probes specific to target miRNAs in deparaffinized tissue sections.
  • Employing streptavidin-tagged quantum dots for signal amplification and multiplexed imaging of multiple miRNAs.
  • Image acquisition and analysis of QD signals to quantify miRNA expression levels within different cellular regions.

Main Results:

  • Successful simultaneous detection of multiple miRNAs within the same tissue section using multiplexed QD technology.
  • High-resolution visualization of miRNA expression patterns in various regions of xenograft and clinical tissue specimens.
  • Demonstration of the ISH-QD assay's capability for accurate miRNA quantification.

Conclusions:

  • The ISH-QD assay provides a powerful and sensitive method for visualizing and quantifying multiple miRNAs in tissue sections.
  • This technique holds significant potential for advancing diagnostic and prognostic applications in diseases where miRNA dysregulation is observed.
  • Multiplexed QD-based ISH offers a valuable tool for understanding miRNA roles in complex biological systems and disease pathology.
Keywords:
BiomarkersCancerCancer associated stromaCellular compartmentsMultiplexed quantum dotsTissue stainingin situ hybridizationmiRNA

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