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Rabies virus binding at neuromuscular junctions.

T G Burrage, G H Tignor, A L Smith

    Virus Research
    |April 1, 1985
    PubMed
    Summary
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    Rabies virus binds to acetylcholine receptors at the neuromuscular junction. This interaction involves specific proteins, suggesting a potential receptor complex for virus entry.

    Area of Science:

    • Neurovirology
    • Molecular Biology
    • Immunology

    Background:

    • Rabies virus infects the nervous system, with its entry mechanism at the neuromuscular junction (NMJ) not fully understood.
    • The neuromuscular junction is critical for nerve-muscle communication, characterized by high densities of acetylcholine receptors (AChR).

    Purpose of the Study:

    • To identify the sub-cellular structures and molecular components involved in rabies virus binding at the NMJ.
    • To investigate the role of acetylcholine receptors in rabies virus attachment and entry.

    Main Methods:

    • Morphological, immunocytochemical, biochemical, and immunological techniques were employed.
    • Methods included immunofluorescence, electron microscopy, immunoelectron microscopy, and immunoblotting.
    • Monoclonal antibodies against AChR and rabies virus glycoproteins were utilized.

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    Main Results:

    • Rabies virus antigen and particles were localized to AChR-rich regions at the NMJ.
    • A monoclonal antibody to the AChR alpha subunit blocked rabies virus attachment to muscle cells.
    • Rabies virus and the AChR antibody bound to 43 kDa and 110 kDa proteins at the motor endplate.
    • An auto-immune response targeting the 110 kDa protein modulated rabies virus antibody activity.

    Conclusions:

    • Rabies virus utilizes a receptor complex at the NMJ, likely involving acetylcholine receptors.
    • Specific viral and host proteins mediate virus binding and potentially entry.
    • The findings provide insights into the molecular basis of rabies virus neuroinvasion.