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[Alternative for the neurovirulence test]

Andreas Schmeel1, Mathias R. Fibi

  • 1Chiron-Behring GmbH & Co., D-Marburg.

ALTEX
|February 15, 2001
PubMed
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[Alternative for the neurovirulence test]

ALTEXยท2001
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A new transgenic mouse model offers a promising alternative to primate testing for oral polio vaccine (OPV) neurovirulence. This method accurately assesses virus attenuation, potentially replacing the traditional monkey neurovirulence test (NVT).

Area of Science:

  • Virology
  • Toxicology
  • Animal Models

Background:

  • The Albert Sabin neurovirulence test (NVT) using primates is crucial for evaluating oral polio vaccine (OPV) attenuation.
  • High primate usage in NVT necessitates the search for alternative testing methods.
  • Transgenic mice expressing the human poliovirus receptor offer a potential alternative model.

Purpose of the Study:

  • To evaluate the efficacy of a transgenic mouse model as an alternative to the primate-based neurovirulence test for oral polio vaccines.
  • To determine if clinical observations in transgenic mice are sufficient for assessing neurovirulence, potentially eliminating histopathological analysis.

Main Methods:

  • Introduction of the human poliovirus receptor gene into mice to create a susceptible model.

Related Experiment Videos

  • Infection of transgenic mice with attenuated poliovirus strains.
  • Observation of clinical symptoms and central nervous system (CNS) lesions in infected mice.
  • Comparison of results with traditional primate NVT, including histopathological analysis.

    • Main Results:

    • Transgenic mice infected with attenuated poliovirus exhibit clinical symptoms and CNS lesions similar to primates.
    • The transgenic mouse neurovirulence test for OPV serotype 3 demonstrated sensitivity comparable to the monkey NVT in a WHO collaborative study.
    • A strong correlation exists between clinical defect severity and CNS lesion spread, suggesting clinical observation alone may suffice.
    • Initial evaluations indicate similar potential for serotype 2, with ongoing studies for serotype 1.

    Conclusions:

    • The transgenic mouse model shows significant promise as a replacement for primate testing in OPV neurovirulence evaluation.
    • Clinical symptom assessment in transgenic mice appears sufficient for evaluating neurovirulence, potentially streamlining the process by omitting histopathology.
    • Further validation studies are underway to fully establish the transgenic mouse NVT as a reliable alternative method for inclusion in pharmaceutical monographs.