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Age-related differences in synaptosomal membrane fluidity

H Ohyama1, M Hiramatsu, N Ogawa

  • 1Department of Neuroscience, Okayama University Medical School, Japan.

Biochemistry and Molecular Biology International
|September 1, 1995
PubMed
Summary

Aging alters synaptosomal membrane fluidity in mouse brains. The order parameter increased with age, particularly in the hippocampus and cerebellum, indicating changes in lipid bilayer structure.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Membrane Biophysics

Background:

  • Synaptosomal membranes are crucial for neuronal function.
  • Lipid bilayer fluidity is essential for membrane protein activity and signaling.
  • Age-related changes in brain membrane composition and fluidity are not fully understood.

Purpose of the Study:

  • To investigate age-related alterations in synaptosomal membrane fluidity across different mouse brain regions.
  • To determine how lipid order parameters change with aging in specific brain areas.

Main Methods:

  • Electron spin resonance (ESR) spectrometry was employed to assess membrane fluidity.
  • Spin labels 5-doxylstearic acid (5-DS) and 16-doxylstearic acid (16-DS) were used to probe membrane order.
  • Synaptosomal membranes were isolated from various mouse brain regions (cortex, hippocampus, striatum, hypothalamus, midbrain, pons-medulla oblongata, cerebellum) at different ages (1, 2, 4, 12, 18 months).

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Main Results:

  • The order parameter for 5-DS significantly increased in all brain regions examined with aging.
  • A more pronounced increase in the 5-DS order parameter was observed in the hippocampus and cerebellum at 18 months of age.
  • Distinct patterns of change in order parameters were noted for 5-DS and 16-DS across different brain regions and aging stages.

Conclusions:

  • Aging leads to increased lipid order (decreased fluidity) in mouse synaptosomal membranes.
  • Specific brain regions, such as the hippocampus and cerebellum, exhibit more significant age-dependent changes in membrane fluidity.
  • These findings highlight regional differences in the impact of aging on neuronal membrane biophysical properties.