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Mast cell fixation and staining in image analysis.

S Bianchi1, L Mugnai

  • 1Dipartimento di Biologia Animale, Università di Firenze, Italy.

European Journal of Basic and Applied Histochemistry
|January 1, 1991
PubMed
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Astra Blue staining is superior to Toluidine Blue for mast cell densitometric analysis. This method accurately quantifies mast cell granules, improving image analysis accuracy in histochemistry.

Area of Science:

  • Histochemistry
  • Cell Biology
  • Image Analysis

Background:

  • Automated image analysis in histochemistry relies on densitometric measurements.
  • Current methods using Toluidine Blue can eliminate crucial information due to operator interpretation.
  • A need exists for staining techniques that preserve data and specifically target cellular components like mast cell granules.

Purpose of the Study:

  • To evaluate staining methods for improved mast cell densitometric analysis.
  • To identify a staining technique that limits staining to mast cell granules, overcoming limitations of current methods.
  • To compare the efficacy of Toluidine Blue and Astra Blue for quantitative image analysis.

Main Methods:

  • Tested Toluidine Blue (buffered and alcoholic solutions) and alcoholic Astra Blue (pH 0.2) staining.

Related Experiment Videos

  • Performed densitometric analysis on 5-micron and semithin mouse tongue sections fixed in Isotonic formaldehyde-acetic acid (IFAA).
  • Acquired digital images using specific wavelengths for each dye (630 nm and 546 nm for Toluidine Blue, 610 nm for Astra Blue).

    • Main Results:

    • Both Toluidine Blue solutions and Astra Blue introduced errors from nuclear and cytoplasmic staining, requiring image elaboration.
    • Astra Blue demonstrated a property to restrict staining specifically to mast cell granules.
    • Preparations stained with Astra Blue consistently captured more pixels than those stained with Toluidine Blue across all transmission levels.

    Conclusions:

    • Astra Blue is a more suitable stain than Toluidine Blue for densitometric image analysis of mast cells.
    • The proposed method involves fixation in IFAA followed by Astra Blue staining for optimal results.
    • This technique enhances accuracy by specifically targeting mast cell granules, reducing interpretive errors in image analysis.