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Related Experiment Videos

Transverse relaxation in rat optic nerve.

Isidro Bonilla1, Richard E Snyder

  • 1Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta T6G 2V2, Canada.

NMR in Biomedicine
|September 26, 2006
PubMed
Summary

Researchers studied proton T(2) relaxation in rat optic nerves, finding over 98% originated from water. A fourth component, possibly cellular water, was identified, suggesting insights into nerve tissue composition.

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Assignment of the T(2) components of amphibian peripheral nerve to their microanatomical compartments.

Magnetic resonance in medicine·2002
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Area of Science:

  • Neuroscience
  • Biophysics
  • Magnetic Resonance Imaging

Background:

  • Proton T(2) relaxation is crucial for understanding water dynamics in biological tissues.
  • The rat optic nerve's relaxation spectrum provides insights into its unique composition and water environment.

Purpose of the Study:

  • To characterize the proton T(2) relaxation spectrum of the rat optic nerve in vitro.
  • To identify and differentiate water proton components within the optic nerve structure.

Main Methods:

  • In vitro proton T(2) relaxation measurements of rat optic nerve.
  • Incubation in Deuterium Oxide (D(2)O) based solutions to isolate water proton signals.
  • Utilizing paramagnetic agents to probe relaxation components.
  • Exposure to glutamate to induce cellular swelling and observe spectral changes.

Main Results:

  • Over 98% of the observed spectrum originated from water protons.
  • The spectrum exhibited three main components, similar to peripheral nerve findings.
  • A small fourth component (<10%) with intermediate T(2) relaxation time was detected.
  • Glutamate-induced swelling increased the size of the longest-lived component, suggesting a cellular water origin.

Conclusions:

  • The rat optic nerve's T(2) relaxation spectrum is dominated by water protons.
  • Distinct water populations exist within the optic nerve, with potential contributions from cellular water.
  • These findings contribute to understanding water compartmentalization in neural tissues.

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