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Related Experiment Videos

Experimental uremic neuropathy. Part 2. Sodium permeability decrease and inactivation in potential clamped nerve

T Brismar, R Tegnèr

    Journal of the Neurological Sciences
    |July 1, 1984
    PubMed
    Summary

    Acute uremia in rats significantly reduces nerve excitability by decreasing sodium permeability in nerve fibers. This leads to slower nerve conduction velocity, impacting overall nerve function.

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    Area of Science:

    • Neuroscience
    • Physiology
    • Nephrology

    Background:

    • Uremia, a complex syndrome associated with kidney failure, can affect peripheral nerve function.
    • Altered ion channel function is a potential mechanism underlying uremic neuropathy.

    Purpose of the Study:

    • To investigate the impact of acute uremia on the excitability and sodium permeability of isolated myelinated nerve fibers.
    • To elucidate the specific changes in sodium channel gating properties contributing to reduced nerve function in uremia.

    Main Methods:

    • Electrophysiological recordings (potential clamp) were performed on isolated sciatic nerve fibers from acutely uremic and control rats.
    • Measurements included sodium permeability (P Na), sodium current reversal potential, and gating parameters (activation and inactivation curves).

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    Main Results:

    • Acutely uremic rats exhibited a marked decrease in nodal membrane sodium permeability (P Na), averaging 24% of control values.
    • This reduction in P Na correlated with decreased nerve conduction velocity.
    • Increased sodium channel inactivation, indicated by a negative shift in the steady-state inactivation curve, was a primary cause of decreased P Na.

    Conclusions:

    • Acute uremia significantly impairs nerve fiber excitability primarily through reduced sodium permeability.
    • Altered sodium channel gating, particularly increased inactivation, underlies the functional deficits observed in uremic neuropathy.
    • Elevated intracellular calcium or cationic metabolite accumulation may contribute to these observed changes.