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Related Experiment Videos

Methods for staining amyloid in tissues: a review.

M T Elghetany1, A Saleem

  • 1Department of Pathology, Baylor College of Medicine, Houston, Texas 77030.

Stain Technology
|July 1, 1988
PubMed
Summary

Identifying amyloid in tissues traditionally uses Congo red staining. Modifications and chemical treatments like autoclaving or potassium permanganate help differentiate amyloid protein types.

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Area of Science:

  • Histopathology
  • Biochemistry
  • Medical Diagnostics

Background:

  • Amyloid identification in tissue sections traditionally relies on Congo red staining and birefringence.
  • Established methods have undergone modifications to enhance sensitivity, specificity, and reliability.
  • The alkaline Congo red method is a common modification improving diagnostic accuracy.

Purpose of the Study:

  • To review and detail various methods for identifying and differentiating amyloid proteins in tissue sections.
  • To explore modifications of Congo red staining and alternative detection techniques.
  • To discuss the utility of chemical and physical treatments in characterizing amyloid types.

Main Methods:

  • Review of traditional Congo red staining techniques and their modifications.
  • Analysis of differential staining properties after treatments: autoclaving, potassium permanganate, and alkaline guanidine.
  • Inclusion of alternative methods: fluorescent (thioflavin T/S), metachromatic (crystal violet), immunofluorescence, and immunoperoxidase staining.

Main Results:

  • Autoclaving, potassium permanganate, and alkaline guanidine treatments differentially affect Congo red affinity of various amyloid proteins (AA, AL, prealbumin, SSA, FAP).
  • Specific treatment durations distinguish between amyloid protein types, e.g., alkaline guanidine differentiates FAP from AL and SSA.
  • Immunohistochemical methods offer precise identification but may have cross-reactivity issues for certain amyloidosis types.

Conclusions:

  • Modified Congo red staining and chemical treatments provide valuable tools for differentiating amyloid protein types.
  • Alternative staining and immunohistochemical methods enhance diagnostic capabilities for amyloidosis.
  • Careful application of these techniques is crucial for accurate amyloid classification in histopathology.

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