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Decrease of glucose utilization rate in the spinal cord of experimental 2,5-hexanedione poisoning rats: application
K Yokoyama1, S Araki, A Akabayashi
1Department of Public Health and Occupational Medicine, Graduate School of Medicine, University of Tokyo, Japan.
Industrial Health
|May 17, 2000
Summary
2,5-Hexanedione (HD) exposure significantly reduces spinal cord glucose utilization rate (GUR) and distribution volume (DV). White matter GUR in HD-exposed rats correlated with blood HD levels, suggesting impaired energy metabolism.
Area of Science:
- Neuroscience
- Toxicology
- Biochemistry
Background:
- 2,5-Hexanedione (HD) is a neurotoxic metabolite of n-hexane.
- Spinal cord glucose metabolism is crucial for neuronal function.
- The impact of HD on spinal cord energy metabolism requires further investigation.
Purpose of the Study:
- To investigate the effects of 2,5-hexanedione (HD) exposure on spinal cord glucose metabolism.
- To quantify changes in glucose utilization rate (GUR) and glucose distribution volume (DV) in specific spinal cord regions.
Main Methods:
- Quantitative microdetermination of 2-deoxyglucose in 8 HD-exposed rats and 10 control rats.
- Application of Sokoloff's three-compartment model to determine GUR and DV.
- Measurement of GUR and DV in spinal cord white matter and anterior horn.
- Multiple regression analysis to correlate GUR with blood HD concentration.
Main Results:
- HD-exposed rats exhibited significantly lower GUR in white matter and anterior horn compared to controls.
- HD exposure led to a significant decrease in DV in the anterior horn.
- White matter GUR in HD-exposed rats showed a significant positive correlation with blood HD concentration.
Conclusions:
- 2,5-Hexanedione exposure impairs glucose metabolism in the rat spinal cord.
- Reduced glucose utilization in the white matter is a primary effect of HD neurotoxicity.
- These findings highlight the detrimental impact of HD on spinal cord energy homeostasis.