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Related Experiment Videos

Toluene-induced alterations in rat synaptosomal membrane composition and function.

C P Le Bel1, R A Schatz

  • 1Toxicology Program, Northeastern University, Boston, MA 02115.

Journal of Biochemical Toxicology
|January 1, 1988
PubMed
Summary

Toluene exposure decreases specific phospholipids in rat brain synaptosomes and inhibits phospholipid methylation. These changes may explain toluene's central nervous system (CNS) effects.

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Area of Science:

  • Neuroscience
  • Toxicology
  • Biochemistry

Background:

  • Toluene is a common organic solvent known to cause acute central nervous system (CNS) effects.
  • Its high concentration and lipophilicity in the CNS necessitate understanding its molecular mechanisms.

Purpose of the Study:

  • To investigate the effects of toluene on rat brain membrane composition and function.
  • To elucidate the role of specific lipid changes and enzymatic activity in toluene's neurotoxicity.

Main Methods:

  • Analysis of rat brain microsomal and synaptosomal phospholipid (PL) and cholesterol (CL) content.
  • Fluorescence polarization studies using 1,6-diphenyl-1,3,5-hexatriene (DPH) to assess membrane fluidity.
  • Investigation of phospholipid methylation using radiolabeled methyl donors.

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Main Results:

  • Toluene (1 g/kg) decreased synaptosomal PL by 24% but did not alter total brain PL, CL, or synaptosomal CL.
  • Membrane fluidity remained unchanged, indicating toluene's effects were not due to altered fluidity.
  • Toluene specifically decreased phosphatidylethanolamine (PE) and inhibited phospholipid methylation using [3H]-methionine.

Conclusions:

  • Toluene induces specific decreases in synaptosomal phosphatidylethanolamine.
  • Inhibition of phospholipid methylation by toluene may contribute to its CNS effects.
  • These findings suggest a critical role for synaptosomal membrane alterations in toluene's neurotoxic mechanisms.