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The molecular mechanisms that mediate genetic variability in response to alcohol are unclear. We found that alcohol had opposite actions (enhancement or suppression) on GABA(A) receptor (GABA(A)R) inhibition in granule cells from the cerebellum of behaviorally sensitive, low alcohol-consuming Sprague-Dawley rats and DBA/2 mice and behaviorally insensitive, high alcohol-consuming C57BL/6 mice, respectively. The effect of alcohol on granule cell GABA(A)R inhibition was determined by a balance between two opposing effects: enhanced presynaptic vesicular release of GABA via alcohol inhibition of nitric oxide synthase (NOS) and a direct suppression of the activity of postsynaptic GABA(A)Rs. The balance of these two processes was determined by differential expression of neuronal NOS (nNOS) and postsynaptic PKC activity, both of which varied across the rodent genotypes. These findings identify opposing molecular processes that differentially control the magnitude and polarity of GABA(A)R responses to alcohol across rodent genotypes.

Opposite actions of alcohol on tonic GABAA receptor currents mediated by nNOS and PKC activity