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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
07:47

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Cerebral cortex synaptic heavy mitochondria may represent the oldest synaptic mitochondrial population: biochemical

M Battino1, J L Quiles, J R Huertas

  • 1Institute of Biochemistry, Faculty of Medicine, University of Ancona, Italy. mbattino@popcsi.unian.it

Journal of Bioenergetics and Biomembranes
|January 5, 2002
PubMed

Insights

Heavy intrasynaptic mitochondria may be older, showing impaired function and altered fatty acids. L-acetylcarnitine treatment did not structurally affect mitochondria in normal rats.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Intrasynaptic mitochondria exhibit microheterogeneity, but the roles of distinct subpopulations remain unclear.
  • Understanding mitochondrial subpopulations is crucial for elucidating neuronal function and dysfunction.

Purpose of the Study:

  • To investigate the characteristics and potential roles of different intrasynaptic mitochondrial subpopulations.
  • To assess the impact of subchronic L-acetylcarnitine treatment on mitochondrial structure.

Main Methods:

  • Differential ultracentrifugation to isolate mitochondrial subpopulations.
  • Biochemical assays to measure mitochondrial function and hydroperoxide levels.
  • Gas chromatography to analyze fatty acid composition.
  • Electron microscopy to evaluate structural integrity.

Main Results:

  • "Heavy" mitochondria exhibited impaired function, elevated hydroperoxides, and significantly altered fatty acid profiles, suggesting they represent aged populations.
  • These modifications in fatty acids altered the protein/lipid ratio, impacting mitochondrial function.
  • Subchronic L-acetylcarnitine treatment (28 days) did not induce structural changes in either nonsynaptic or intrasynaptic mitochondria in normal rats under steady-state conditions.

Conclusions:

  • "Heavy" intrasynaptic mitochondria are likely aged, characterized by functional decline and compositional changes.
  • L-acetylcarnitine does not appear to cause structural damage to mitochondria in healthy rats during short-term treatment.

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