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Related Experiment Videos

Differentiation between dysmyelination and demyelination using magnetic resonance diffusional anisotropy

J Ono1, K Harada, M Takahashi

  • 1Department of Pediatrics, Faculty of Medicine, Osaka University, Japan.

Brain Research
|February 6, 1995
PubMed
Summary

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Magnetic resonance diffusion-weighted imaging differentiates hypomyelination from demyelination. This method revealed intact diffusion anisotropy in hypomyelination (jimpy mice) but reduced anisotropy in demyelination (twitcher mice).

Area of Science:

  • Neuroscience
  • Medical Imaging
  • Biochemistry

Background:

  • Pelizaeus-Merzbacher disease (hypomyelination) and Krabbe disease (demyelination) are severe neurological disorders.
  • Animal models, jimpy and twitcher mice, are crucial for studying these conditions.
  • Current diagnostic methods may not always distinguish between hypomyelination and demyelination in vivo.

Purpose of the Study:

  • To investigate the utility of magnetic resonance (MR) diffusion-weighted imaging (DWI) in differentiating hypomyelination from demyelination.
  • To examine diffusion properties of the optic and trigeminal nerves in mouse models of these disorders.

Main Methods:

  • Utilized MR diffusion-weighted imaging to assess optic and trigeminal nerves in jimpy (hypomyelination) and twitcher (demyelination) mice.

Related Experiment Videos

  • Compared diffusion parameters in affected nerves against age-matched control mice.
  • Corroborated findings with electron microscopy to assess axonal integrity.

    • Main Results:

    • Jimpy mice showed no significant difference in optic nerve diffusional anisotropy compared to controls, indicating anisotropy exists without extensive myelin.
    • Twitcher mice exhibited markedly attenuated diffusional anisotropy in both optic and trigeminal nerves.
    • Electron microscopy confirmed loss of axonal straightness as a primary cause for anisotropy reduction in twitcher mice.

    Conclusions:

    • MR diffusion-weighted imaging can differentiate between hypomyelination and demyelination in vivo.
    • Diffusional anisotropy is preserved in hypomyelination but significantly reduced in demyelination.
    • Axonal integrity plays a critical role in maintaining diffusion anisotropy in myelinated nerves.