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Nitrous oxide-induced c-Fos expression in the rat brain
Karl J Kaiyala1, Todd E Thiele, Chae H Watson
1School of Dentistry, University of Washington, Seattle 98195, USA. kkaiyala@u.washington.edu
Brain Research
|March 26, 2003
Summary
Nitrous oxide (N2O) activates several brain regions, similar to ethanol. This study mapped N2O
Area of Science:
- Neuroscience
- Pharmacology
Background:
- c-Fos induction maps activated cells in the central nervous system (CNS).
- Ethanol and nitrous oxide (N2O) share overlapping physiological and behavioral effects.
- Limited research exists on brain areas activated by N2O.
Purpose of the Study:
- To investigate if N2O and ethanol activate similar sites in the CNS.
- To map N2O-induced neuronal activation across the rat brain using c-Fos expression.
Main Methods:
- Male Long-Evans rats were exposed to varying concentrations of N2O (0-60%) for 2 hours.
- c-Fos-like immunoreactivity was assessed in brain slices post-exposure.
- Dose-dependent changes in c-Fos expression were analyzed in multiple brain regions.
Main Results:
- N2O caused significant, dose-related increases in c-Fos expression in forebrain regions (hypothalamus, thalamus, amygdala, retrosplenial cortex).
- Midbrain (Edinger-Westphal nucleus) and hindbrain (locus coeruleus, nucleus of the solitary tract, ventrolateral medulla) also showed N2O-induced c-Fos expression.
- The majority of identified N2O-activated areas are also activated by ethanol.
Conclusions:
- N2O activates a wide range of CNS areas, including those also affected by ethanol.
- The overlapping patterns of activation suggest N2O and ethanol may act on similar neuronal pathways.
- This study provides a comprehensive map of N2O's central nervous system targets.