Adolescent intermittent ethanol exposure produces Sex-Specific changes in BBB Permeability: A potential role for VEGFA.
Level 5 - mechanism / opinion, no new human data
Preclinical animal study evaluating neurobiological and blood-brain barrier alterations in rats.
PubMed 35245677 · doi:10.1016/j.bbi.2022.02.030
What was done
Male and female Sprague Dawley rats received adolescent intermittent ethanol (AIE; 4 g/kg intragastrically) or water control between postnatal days 30 and 50. In adulthood (~P75), blood-brain barrier (BBB) permeability was assessed using FITC-tagged dextrans of varying molecular weights (4, 20, and 70 kDa) via gross tissue fluorometry (Experiment 1) and immunofluorescence with an adult-exposure comparator group (Experiment 2). Experiment 3 examined VEGFA expression and co-localization with pericyte marker PDGFRβ in adult male rats with AIE history following an acute ethanol challenge (3.5 g/kg i.p.) or vehicle.
What was found
Male rats with AIE history exhibited significantly increased dextran permeability in the nucleus accumbens, cingulate prefrontal cortex, and amygdala, with increases also observed in the hippocampus and ventral tegmental area in both adolescent- and adult-exposed males. Female rats showed no changes in BBB permeability across evaluated regions. In adult males, prior AIE led to significantly fewer total VEGFA-expressing cells and fewer PDGFRβ-positive cells co-expressing VEGFA in the amygdala and dorsal hippocampus following acute ethanol challenge. The abstract reported no exact numerical values, percentages, or variance estimates.
Why it matters
These findings suggest that adolescent binge alcohol exposure causes persistent, male-specific disruptions in blood-brain barrier integrity in adulthood, potentially mediated through alterations in vascular endothelial growth factor signaling and pericyte regulation.
Limits
The study was conducted exclusively in a rodent model, limiting direct extrapolation to human adolescent drinking. Total sample sizes and group sizes (n) were not reported in the abstract. Quantitative values, confidence intervals, and effect sizes were omitted from the text, and mechanisms underlying female resilience to these BBB alterations were not established.
Cited by
- partial Chronic alcohol consumption leads to blood-brain barrier leakage in males, whereas age-matched female chronic drinkers show relatively preserved vascular function.