We have demonstrated that the mammalian antidiuretic hormone, arginine vasopressin (AVP), will maintain functional tolerance to the hypnotic effect of ethanol in mice, beyond the time in which such tolerance normally dissipates. However, when mice are made tolerant to ethanol and then injected intraventricularly with 6-hydroxydopamine (6-OHDA), AVP is no longer effective in maintaining tolerance. The action of AVP was attenuated by a dose of 6-OHDA which significantly lowered brain norepinephrine, but not dopamine levels, suggesting that the maintenance of ethanol tolerance by AVP may require the presence of intact noradrenergic pathways in brain.
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