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In-situ Hybridization02:31

In-situ Hybridization

In situ hybridization (ISH) is a technique used to detect and localize specific DNA or RNA molecules in cells, tissue, or tissue sections using a labeled probe. The technique was first used in 1969 for the investigation of nucleic acids. It is currently an essential tool in scientific research and clinical settings, especially for diagnostic purposes.
Types of probes and labels
A probe is a complementary strand of DNA or RNA that binds to corresponding nucleotide sequences in a cell. Many...

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1Nonradioactive In Situ Hybridization in Atherosclerotic Tissue.

J Apostolopoulos1

  • 1Research Department, Australian Red Cross Blood Service, Victoria, Australia.

Methods in Molecular Medicine
|February 23, 2011
PubMed
Summary

Nonradioactive in situ hybridization (ISH) offers a sensitive and cost-effective method for detecting nucleic acids in tissues. This technique, utilizing digoxigenin (DIG) labeling, enhances speed and resolution for molecular localization in atherosclerotic tissue research.

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Area of Science:

  • Molecular Biology
  • Histology
  • Biochemistry

Background:

  • In situ hybridization (ISH) is a key technique for detecting nucleic acids within cells and tissues.
  • Traditional ISH methods using radioactive labels had limitations in speed, resolution, and safety.
  • Advancements in nonradioactive labeling and detection systems have overcome these limitations.

Purpose of the Study:

  • To describe a protocol for nonradioactive in situ hybridization (ISH) optimized for atherosclerotic tissue.
  • To detail the use of digoxigenin (DIG) for indirect probe labeling and subsequent detection.
  • To enable the detection of specific genes (interleukin 8, tissue factor, tissue factor pathway inhibitor) in atherosclerotic samples.

Main Methods:

  • Preparation of atherosclerotic tissue samples (frozen and paraffin-embedded).
  • Indirect labeling of nucleic acid probes using digoxigenin (DIG) via various enzymatic incorporation methods.
  • Hybridization, washing, and detection using anti-DIG antibodies conjugated with enzymes (e.g., alkaline phosphatase) or other labels.

Main Results:

  • Demonstrated the successful application of nonradioactive ISH for localizing nucleic acids in atherosclerotic tissues.
  • Achieved high sensitivity (down to 0.1 pg) using DIG-labeled probes and antibody-based detection systems.
  • Enabled the specific detection of interleukin 8, tissue factor, and tissue factor pathway inhibitor mRNA.

Conclusions:

  • Nonradioactive ISH with DIG labeling provides a versatile, sensitive, and cost-effective alternative to radioactive methods.
  • This protocol is suitable for analyzing gene expression in atherosclerotic tissues, offering improved speed and resolution.
  • The method facilitates the study of molecular mechanisms in atherosclerosis by enabling precise localization of target nucleic acids.