Voluntary selection of and tolerance to 1,2 propanediol (propylene glycol) by high and low ethanol-selecting mouse strains.

Abstract
Fifteen male mice from each of 4 inbred strains (C57BL/6J, BALB/cJ, CBA/J, and DBA/2J) were tested to determine their voluntary self-selection of a 10% solution of 1,2 propanediol (1,2 PD), A 3-carbon alcohol of low toxicity. As with ethanol, the C57BL/6J strain consumed significantly greater amounts that the 3 other low ethanol-selecting strains. A second experiment determined that the 3 low selecting strains suffered significantly greater depression of the central nervous system from 1,2 PD than the high selecting C57BL strain. It was also found that ethanol is a much more potent depressant that 1,2 PD. These results are discussed in terms of the possible role of neural sensitivity in regulating consumption levels of the 2 alcohols.

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