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Tissue-specific miRNA Expression Profiling in Mouse Heart Sections Using In Situ Hybridization
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Tissue-specific miRNA Expression Profiling in Mouse Heart Sections Using In Situ Hybridization

Published on: September 15, 2018

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Tissue-specific miRNA Expression Profiling in Mouse Heart Sections Using In Situ Hybridization

Fani Memi1, Daniela Tirziu2, Irinna Papangeli3

  • 1Department of Cell and Developmental Biology, University College London.

Journal of Visualized Experiments : Jove
|October 2, 2018
PubMed

Insights

This study presents a method for detecting micro-RNAs (miRNAs) and proteins in mouse heart tissue. The technique uses digoxigenin-labeled Locked Nucleic Acid probes for miRNA detection and protein immunostaining for co-localization.

Area of Science:

  • Molecular Biology
  • Cardiovascular Research
  • Biochemistry

Background:

  • Micro-RNAs (miRNAs) are crucial regulators of gene expression involved in numerous biological and disease processes.
  • Reliable methods for detecting specific miRNA transcripts in tissue are essential for understanding their roles.
  • Cardiac hypertrophy involves complex molecular changes, necessitating tools to study miRNA involvement.

Purpose of the Study:

  • To establish a detailed protocol for simultaneous detection of miRNA and protein expression in mouse heart sections.
  • To validate the protocol using miRNA-182 and cardiac Troponin T (cTnT) in a cardiac hypertrophy model.
  • To provide a versatile method for investigating miRNA and protein co-localization in cardiovascular research.

Main Methods:

  • In situ hybridization using digoxigenin-labeled (DIG) Locked Nucleic Acid (LNA) probes for miRNA detection.
  • Immunohistochemistry for cardiac Troponin T (cTnT) protein detection on the same tissue sections.
  • Combined colorimetric (alkaline phosphatase) and fluorescent assays for simultaneous signal visualization.

Main Results:

  • Successfully detected miRNA-182 expression in mouse heart sections using DIG-LNA probes.
  • Co-localized miRNA-182 with cardiomyocytes by immunostaining for cTnT protein.
  • Demonstrated the feasibility of the combined protocol for simultaneous miRNA and protein analysis.

Conclusions:

  • The developed protocol enables sensitive and specific detection of miRNAs and proteins in mouse heart tissue.
  • This method facilitates the study of miRNA roles in cardiac diseases by allowing co-localization with specific cell types or proteins.
  • The protocol is adaptable for detecting various miRNAs and proteins, offering a valuable tool for cardiovascular research.

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