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Related Experiment Videos

Fixation, decalcification, and tissue processing effects on articular cartilage proteoglycans.

I Kiviranta, M Tammi, J Jurvelin

    Histochemistry
    |January 1, 1984
    PubMed
    Summary

    Neutral buffered formaldehyde fixation effectively preserves proteoglycan content in bovine articular cartilage. Alcoholic fixatives enhance matrix staining, likely by preserving glycoprotein oligosaccharides, while quaternary ammonium salts inhibit it.

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    Area of Science:

    • Biochemistry
    • Histology
    • Biomaterials Science

    Background:

    • Proteoglycans are crucial for articular cartilage function and integrity.
    • Accurate assessment of cartilage matrix requires optimal fixation methods.
    • Formaldehyde and alcoholic solutions are common fixatives with varying effects.

    Purpose of the Study:

    • To evaluate the impact of different fixation methods on proteoglycan content in bovine articular cartilage.
    • To investigate the effect of fixation on cartilage matrix staining properties.
    • To determine the influence of demineralization and tissue processing on cartilage composition.

    Main Methods:

    • Bovine articular cartilage samples were fixed using neutral buffered 4% formaldehyde for 48 hours.
    • Samples underwent demineralization with 10% EDTA and standard light microscopic tissue processing.

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  • Staining intensity (Safranin O and Periodic Acid Schiff) was quantified using microspectrophotometry.
  • The effects of quaternary ammonium salts in fixatives were also assessed.

    • Main Results:

    • Neutral buffered 4% formaldehyde fixation for 48 hours effectively preserved proteoglycan content (hexosamine and uronic acid).
    • Neither EDTA demineralization nor light microscopic processing altered the measured hexosamine or uronic acid content.
    • Alcoholic fixatives significantly increased Safranin O binding and Periodic Acid Schiff reaction.
    • Quaternary ammonium salts in fixatives demonstrably suppressed cartilage matrix staining.

    Conclusions:

    • Neutral buffered 4% formaldehyde is a suitable fixative for preserving proteoglycan content in articular cartilage.
    • Alcoholic fixatives may enhance matrix staining by improving glycoprotein oligosaccharide preservation.
    • Quaternary ammonium salts interfere with Safranin O staining, suggesting caution in their use for cartilage analysis.