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Modern acrylics for post-embedding immunostaining techniques.

G R Newman, J A Hobot

    The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
    |September 1, 1987
    PubMed
    Summary
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    Two new methods rapidly process biological tissues using LR White acrylic plastic, improving immunocytochemistry sensitivity and reducing monomer damage. These techniques preserve fine structure in tissues like human pituitary and rat kidney.

    Area of Science:

    • Electron microscopy
    • Biotechnology
    • Histology

    Background:

    • LR White acrylic plastic embedding is crucial for high-resolution microscopy.
    • Conventional embedding methods can damage delicate biological structures due to prolonged exposure to plastic monomers and dehydration steps.

    Purpose of the Study:

    • To develop rapid and effective methods for processing biological tissues using LR White acrylic plastic.
    • To enhance the sensitivity of post-embedding immunocytochemistry by minimizing tissue damage.

    Main Methods:

    • Two novel methods for LR White embedding were developed, utilizing partial dehydration due to LR White's water compatibility.
    • Method 1: Rapid processing of thoroughly fixed human pituitary at 50°C with controlled catalytic polymerization.
    • Method 2: Slower polymerization at 0°C for lightly fixed tissues, preventing artifacts.

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    Main Results:

    • Both methods reduce tissue exposure to damaging plastic monomers, minimizing shrinkage and extraction.
    • Method 1 demonstrated successful immunoperoxidase reagent penetration into 330-nm LR White sections of human pituitary.
    • Method 2 preserved fine structures in rat kidney, showing trans-tubular Golgi and localized biotinylated lectin, and maintained bacterial cell envelope integrity.

    Conclusions:

    • The described methods offer rapid and effective tissue processing for LR White embedding.
    • These techniques improve immunocytochemistry sensitivity and preserve ultrastructural details in various biological samples.
    • The methods are adaptable for both thoroughly and lightly fixed tissues, offering versatility in electron microscopy preparation.