Abuse of alcohol and smoking are extensively co-morbid. Some studies suggest partial commonality of action of alcohol and nicotine mediated through nicotinic acetylcholine receptors (nAChRs).
We tested mice with transgenic over expression of the alpha 5, alpha 3, beta 4 receptor subunit genes, which cluster on human chromosome 15, that were previously shown to have increased nicotine self-administration, for several responses to ethanol.
Transgenic and wild-type mice did not differ in sensitivity to several acute behavioral responses to ethanol. However, transgenic mice drank less ethanol than wild-type in a two-bottle (ethanol vs. water) preference test.
These results suggest a complex role for this receptor subunit gene cluster in the modulation of ethanol's as well as nicotine's effects.
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