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Related Experiment Videos

Decrease and recovery of N-acetylaspartate/creatine in rat brain remote from focal injury.

C Gasparovic1, N Arfai, N Smid

  • 1Department of Neurosciences, University of New Mexico School of Medicine, Albuquerque 87131, USA. chuck@unm.edu

Journal of Neurotrauma
|April 4, 2001
PubMed
Summary

Traumatic brain injury (TBI) can cause remote N-acetylaspartate (NAA) reduction. This study suggests metabolic depression, not cell death, may explain this remote NAA decrease after TBI.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Medical Imaging

Background:

  • Traumatic brain injury (TBI) can lead to reductions in the neuronal metabolite N-acetylaspartate (NAA) in brain regions distant from the initial injury.
  • These remote NAA reductions have been primarily attributed to diffuse axonal injury (DAI) or neuronal death.

Purpose of the Study:

  • To investigate the role of metabolic depression, independent of DAI or cell death, in causing remote NAA reduction following TBI.
  • To differentiate between cell death and metabolic changes as causes of remote NAA alterations post-TBI.

Main Methods:

  • Adult rats underwent focal TBI via a weight-drop model targeting the sensorimotor cortex.
  • Tissue slices from the occipital cortex (remote from injury) were analyzed using proton magnetic resonance spectroscopy (1H-MRS) at 2 and 6 days post-injury.

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  • The ratio of N-acetylaspartate to total creatine (NAA/TCr) was measured and compared to uninjured controls.

    • Main Results:

    • A significant 14% decrease in NAA/TCr was observed in the occipital cortex 2 days after TBI compared to controls.
    • NAA/TCr levels showed partial recovery by 6 days post-injury, nearing control values (within 7%).
    • The temporal profile of NAA/TCr changes mirrored previously observed patterns of metabolic depression and recovery (2-deoxyglucose uptake, mitochondrial enzyme activity) in this TBI model.

    Conclusions:

    • Remote NAA reduction after TBI can be partly explained by widespread, reversible metabolic depression.
    • This metabolic depression occurs independently of diffuse axonal injury or neuronal cell death.
    • Findings highlight the dynamic metabolic consequences of TBI in remote brain areas.