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Related Experiment Videos

Synaptic membrane structure in Torpedo electric organ.

J Rosenbluth

    Journal of Neurocytology
    |December 1, 1975
    PubMed
    Summary

    Electron microscopy reveals that Torpedo electrocytes possess high concentrations of acetylcholine receptors (AChRs) on their innervated membranes. These receptors are distributed across the entire surface, not just at synaptic junctions.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Biophysics

    Background:

    • Torpedo electrocytes are specialized cells generating electric current.
    • The innervated membrane of electrocytes plays a crucial role in signal transmission.
    • Previous studies suggested granular structures in amphibian neuromuscular junctions are acetylcholine receptors (AChRs).

    Purpose of the Study:

    • To investigate the ultrastructure of innervated and noninnervated membranes of Torpedo electrocytes.
    • To determine the distribution and nature of granular structures in the electrocyte membranes.
    • To assess the concentration and localization of putative acetylcholine receptors (AChRs).

    Main Methods:

    • Electron microscopy (thin-sectioning and freeze-fracture techniques).
    • Analysis of membrane structure, including outer dense lamina and granular substructure.
    • Comparison of innervated and noninnervated membranes.

    Main Results:

    • The ventral innervated membrane of Torpedo electrocytes exhibits a thick outer dense lamina with granular substructure (approx. 70 A diameter).
    • These granules are morphologically similar to proposed acetylcholine receptors (AChRs) in amphibian junctions.
    • Freeze-fracture revealed particles on the membrane's A face corresponding to these granules, extending into the hydrophobic layer.
    • High concentrations of these structures are found across the entire innervated membrane, not restricted to junctions.
    • Cytoplasmic surfaces show amorphous coatings with attached filaments.
    • Synaptic vesicle and axon terminal membranes also contain granules, but sparsely distributed.

    Conclusions:

    • The granular structures in the innervated membrane of Torpedo electrocytes are likely acetylcholine receptors (AChRs).
    • Torpedo electrocytes possess high concentrations of AChRs in both extrajunctional and post-junctional regions of the innervated membrane.
    • This widespread distribution suggests a unique role for AChRs in the electrocyte's function beyond typical synaptic transmission.

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