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Reduced antinociception in mice lacking neuronal nicotinic receptor subunits
L M Marubio1, M del Mar Arroyo-Jimenez, M Cordero-Erausquin
1CNRS UA D1284-Neurobiologie Moléculaire, Institut Pasteur, Paris, France.
Nature
|May 11, 1999
Summary
Nicotine
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Nicotine's pain-relieving effects involve nicotinic acetylcholine receptors (nAChRs).
- Specific nAChR subunits mediating these effects are not fully understood.
Purpose of the Study:
- To investigate the role of alpha4 and beta2 nAChR subunits in nicotine's antinociceptive effects.
Main Methods:
- Generated alpha4 knockout mice and used beta2 knockout mice.
- Assessed nicotine's antinociceptive effects using hot-plate and tail-flick tests.
- Performed patch-clamp recordings on neurons.
Main Results:
- Alpha4 knockout mice lacked high-affinity nicotine and epibatidine binding sites.
- Both alpha4 and beta2 knockout mice showed reduced antinociception to nicotine.
- Nicotine failed to elicit responses in raphe magnus and thalamic neurons in knockout mice.
Conclusions:
- The alpha4 nAChR subunit, potentially with beta2, is essential for nicotine's pain-relief effects.
- These findings clarify the molecular mechanisms of nicotine-induced analgesia.
