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Freeze-drying technique in electron microscopic immunohistochemistry.

S Hisano, T Adachi, S Daikoku

    The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
    |May 1, 1985
    PubMed
    Summary

    Freeze-drying improves ultrastructure preservation and antigenicity for immunolabeling of rat neurohypophysis. This method allows for simultaneous detection of multiple antigens, like arginine vasopressin (AVP) and oxytocin (OXT), within secretory granules.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Immunocytochemistry

    Background:

    • The rat neurohypophysis is crucial for hormone release, specifically arginine vasopressin (AVP) and oxytocin (OXT).
    • Accurate visualization of these neuropeptides within their storage granules requires optimal sample preparation techniques for immunocytochemistry.

    Purpose of the Study:

    • To compare the efficacy of freeze-drying (FD) versus conventional aqueous fixation for postembedding immunocytochemical labeling of AVP and OXT in rat neurohypophysis.
    • To assess the preservation of ultrastructure and antigenicity using the FD method.
    • To evaluate the feasibility of simultaneous dual-labeling of AVP and OXT in the same nerve terminals.

    Main Methods:

    • Postembedding immunocytochemical labeling was performed on rat neurohypophysis sections.

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  • Samples were prepared using either freeze-drying, vapor fixation, and Spurr resin embedding (FD) or conventional aqueous fixation and Spurr resin embedding (Con).
  • Arginine vasopressin (AVP) and oxytocin (OXT) were labeled using protein A-gold complexes with specific antibodies.

    • Main Results:

    • Freeze-drying (FD) resulted in superior ultrastructural preservation and enhanced antigenicity compared to conventional (Con) methods.
    • FD sections showed a higher density of gold particles over secretory granules and restricted labeling to granules, unlike Con sections where extragranular axoplasm was also labeled.
    • Simultaneous labeling of AVP and OXT was successfully achieved in FD sections, revealing both antigens within secretory granules of distinct axon terminals.

    Conclusions:

    • Freeze-drying is a highly effective method for preparing rat neurohypophysis tissue for immunocytochemistry, offering better ultrastructure and antigen preservation.
    • The FD technique enables precise localization of neuropeptides to secretory granules and facilitates the simultaneous detection of multiple antigens.
    • FD preparations are valuable for studying the co-localization and distribution of multiple neuropeptides within the same neurosecretory granules.