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Early spatial memory deficit induced by 2,5-hexanedione in the rat
R Carney1, C Dardis, W K Cullen
1Department of Pharmacology and Therapeutics, Zoology Building, Trinity College, University of Dublin, Dublin 2, Ireland.
Toxicology Letters
|March 1, 2002
Summary
2,5-Hexanedione (2,5-HD) exposure impaired spatial memory in rats before motor symptoms appeared. These findings suggest 2,5-HD may cause cognitive deficits preceding neurotoxicity.
Area of Science:
- Neuroscience
- Toxicology
- Cognitive Science
Background:
- 2,5-Hexanedione (2,5-HD) is a neurotoxic metabolite of n-hexane and methyl n-butyl ketone.
- 2,5-HD causes delayed neuropathy and sensorimotor impairments.
Purpose of the Study:
- To investigate if 2,5-HD causes cognitive deficits, specifically in spatial navigation, before sensorimotor impairments manifest.
- To examine the effects of 2,5-HD on spatial memory in rats.
Main Methods:
- Rats were exposed to 2,5-HD via drinking water (1% for 2 weeks) or intraperitoneal injection (500 mg/kg/day for 4 days).
- Spatial navigation was assessed using a water maze, evaluating escape learning and spatial strategy recall.
- Motor activity was monitored in an open field holeboard apparatus to ensure no sensorimotor deficits.
Main Results:
- 2,5-HD exposure did not significantly affect escape learning in the water maze.
- Rats treated with 2,5-HD showed impaired use of spatial strategies during a recall test.
- Similar spatial memory deficits were observed without significant changes in sensorimotor ability or body weight.
Conclusions:
- 2,5-Hexanedione can induce cognitive deficits, particularly in spatial memory, prior to the onset of motor symptoms.
- These findings suggest that 2,5-HD may mediate some cognitive effects associated with hexacarbon exposure.
- Cognitive impairments may serve as an early indicator of 2,5-HD neurotoxicity.