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Systemic osmotic manipulations modulate ethanol-induced taurine release: a brain microdialysis study
Etienne Quertemont1, Audrey Devitgh, Philippe De Witte
1Biologie du Comportement, Université catholique de Louvain, Place Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium. equertemont@ulg.ac.be
Alcohol (Fayetteville, N.Y.)
|March 27, 2003
Summary
Ethanol increases brain taurine levels, especially when the body is in a hypoosmotic state. Hyperosmotic conditions, however, reduce or prevent this ethanol-induced taurine release, highlighting the role of osmoregulation.
Area of Science:
- Neuroscience
- Pharmacology
- Physiology
Background:
- Previous microdialysis studies show ethanol increases extracellular taurine in rat brains.
- The exact mechanisms behind ethanol-induced taurine increases, potentially linked to cell swelling, were unclear.
Purpose of the Study:
- To investigate if the body's osmotic state influences ethanol's effect on brain extracellular taurine concentrations.
Main Methods:
- Rats were subjected to hypoosmotic or hyperosmotic states superimposed on acute ethanol (2.0-g/kg) administration.
- Extracellular taurine concentrations in the nucleus accumbens were measured using intracerebral microdialysis.
- Osmotic states were induced by water administration (hypoosmotic) or hypertonic saline injections (1.8% or 3.6% saline).
Main Results:
- Ethanol significantly increased taurine levels in isoosmotic conditions.
- Hypoosmotic conditions potentiated ethanol-induced taurine release.
- Hyperosmotic conditions (1.8% and 3.6% saline) attenuated or completely prevented ethanol-induced taurine increases.
Conclusions:
- Osmoregulation plays a primary role in ethanol-induced taurine release.
- Ethanol-induced cell swelling likely activates volume-sensitive channels, leading to passive taurine diffusion.