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Age-related decrease in axonal transport measured by MR imaging in vivo.

Donna J Cross1, Jennifer A Flexman, Yoshimi Anzai

  • 1Washington National Regional Primate Center, Washington, USA.

Neuroimage
|November 6, 2007
PubMed
Summary
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Aging significantly slows axonal transport in rat brains, measurable with manganese-enhanced MRI. This study quantifies age-related declines in neuronal transport rates, crucial for understanding neurodegenerative diseases.

Area of Science:

  • Neuroscience
  • Biophysics

Background:

  • Axonal transport is vital for neuronal health and function.
  • In vitro studies suggest age-related decreases in transport rates.
  • Disrupted axonal transport is linked to neurodegenerative disorders.

Purpose of the Study:

  • To investigate age-related changes in axonal transport in vivo.
  • To measure brain transport rates in aged rats using manganese-enhanced MRI (Mn-MRI).

Main Methods:

  • Longitudinal in vivo Mn-MRI in rats (n=4) and a separate aged group (n=3).
  • Serial T1-weighted imaging pre- and post-manganese chloride (MnCl2) administration.
  • Kinetic analysis and mass transport modeling to estimate transport rates and time to peak Mn2+ flow.

Main Results:

Related Experiment Videos

  • Aged rats exhibited significantly decreased axonal transport rates compared to younger rats.
  • Neuronal transport rates decreased by 58% in mid-age and 71% in aged rats.
  • Transport rate reductions correlated positively with increased age.

Conclusions:

  • In vivo Mn-MRI with kinetic analysis effectively measures age-related axonal transport decline.
  • This technique offers a novel approach to studying neuronal transport dynamics in aging and disease.