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Theophylline blocks ethanol withdrawal-induced hyperalgesia
Michael B Gatch1, Meghan Selvig
1Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX 76107-2699, USA.
Alcohol and Alcoholism (Oxford, Oxfordshire)
|July 11, 2002
Summary
Theophylline prevents pain sensitivity during ethanol withdrawal in rats. This suggests adenosine receptors are key in managing alcohol withdrawal symptoms and associated hyperalgesia.
Area of Science:
- Neuroscience
- Pharmacology
- Pain Research
Background:
- Ethanol consumption can lead to physical dependence and withdrawal syndromes.
- Ethanol withdrawal is often associated with hyperalgesia, an increased sensitivity to pain.
Purpose of the Study:
- To investigate the effect of theophylline on hyperalgesia induced by ethanol withdrawal.
- To explore the role of adenosine receptors in ethanol withdrawal-induced pain sensitivity.
Main Methods:
- Rats were exposed to ethanol via a liquid diet for 10 days.
- Theophylline was administered intraperitoneally (i.p.) at doses of 0.5 and 1.0 mg/kg.
- Hyperalgesia was assessed using a radiant heat tail-flick assay during ethanol withdrawal.
Main Results:
- Chronic ethanol exposure induced antinociception, with hyperalgesia observed during withdrawal.
- Theophylline dose-dependently attenuated ethanol-withdrawal-induced hyperalgesia.
- The reduced potency of 2-chloroadenosine (2-CADO) during withdrawal was reversed by theophylline.
Conclusions:
- Theophylline's administration provides behavioral evidence supporting adenosine's role in ethanol tolerance and withdrawal.
- Adenosine receptors are implicated in the development of hyperalgesia during ethanol withdrawal.