Decreased glucose transporter 1 gene expression and glucose uptake in fetal brain exposed to ethanol

Using pregnant rats fed equicaloric liquid diets (AF, ad libitum-fed controls; PF, pair-fed controls; EF, ethanol-fed), we have previously shown that maternal alcoholism produces a specific and significant decrease of glucose in the fetal brain, which is accompanied by growth retardation. To further define the mechanisms of ethanol-induced perturbations in fetal fuel supply, we have examined (i) the uptake of 2-deoxyglucose (2-DG) by dissociated brain cells from fetal rats that were exposed to ethanol in utero and (ii) the steady-state levels of the glucose transporter-1 (GT-1) mRNA. A 9% decrease in brain weight (P < 0.001) and a 54.8% reduction in 2-DG uptake into brain cells (P < 0.02) were found in offspring of EF mothers compared to the AF group. Brain weight correlated with the rate of 2-DG uptake (P< 0.05). Northern blot analysis showed a 50% reduction of GT-1 mRNA in EF brain relative to that in the AF and PF groups. We conclude that glucose transport into the brain is an important parameter altered by maternal ethanol ingestion.