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Related Experiment Videos

Changes in sciatic nerve and spinal cord function induced by a CNS viral infection

R A Gerren1, T C Johnson

  • 1Section of Virology and Oncology, Kansas State University, Manhattan 66506.

Brain Research Bulletin
|January 1, 1994
PubMed
Summary

Early electrophysiologic testing detected virus-induced changes in mouse sciatic nerve and spinal cord function before clinical symptoms of central nervous system (CNS) disease appeared.

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Area of Science:

  • Neuroscience
  • Virology
  • Electrophysiology

Background:

  • Central nervous system (CNS) infections can cause neurological damage.
  • Early detection of viral effects on neural pathways is crucial for understanding disease progression.

Purpose of the Study:

  • To investigate electrophysiologic changes in mouse sciatic nerve and spinal cord following infection with a temperature-sensitive vesicular stomatitis virus (VSV) mutant.
  • To determine if electrophysiologic measurements can detect CNS changes before clinical symptoms manifest.

Main Methods:

  • Mice were inoculated with a temperature-sensitive (ts) VSV mutant (G31 KS5).
  • Electrophysiologic responses of the sciatic nerve and spinal cord were measured.
  • Sciatic nerve conduction velocities, sciatic nerve response (SNR) recovery, and crossed spinal responses (CSRs) were analyzed.

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Main Results:

  • No significant difference in sciatic nerve peak conduction velocities between virus-inoculated and control groups.
  • Altered SNR recovery time course observed by 4 days post-VSV inoculation, with significantly depressed amplitude ratios.
  • Altered CSR recovery time course observed by 5 days post-VSV inoculation, with significantly depressed area ratios.

Conclusions:

  • Simple electrophysiologic techniques can detect virus-induced changes in the peripheral and central nervous systems.
  • These electrophysiologic changes occur before the onset of clinical symptoms of VSV-induced CNS disease.
  • Electrophysiology offers a sensitive method for early detection of neural dysfunction in viral CNS infections.