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Updated: May 22, 2026
Construction of Vapor Chambers Used to Expose Mice to Alcohol During the Equivalent of all Three Trimesters of Human Development
Published on: July 13, 2014
Early alcohol exposure disrupts visual cortex plasticity in mice
Crystal L Lantz1, Weili Wang, Alexandre E Medina
1Department of Anatomy and Neurobiology, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, United States.
Abstract:
There is growing evidence that deficits in neuronal plasticity underlie the cognitive problems seen in fetal alcohol spectrum disorders (FASD). However, the mechanisms behind these deficits are not clear. Here we test the effects of early alcohol exposure on ocular dominance plasticity (ODP) in mice and the reversibility of these effects by phosphodiesterase (PDE) inhibitors. Mouse pups were exposed to 5 g/kg of 25% ethanol i.p. on postnatal days (P) 5, 7 and 9. This type of alcohol exposure mimics binge drinking during the third trimester equivalent of human gestation. To assess ocular dominance plasticity animals were monocularly deprived at P21 for 10 days, and tested using optical imaging of intrinsic signals. During the period of monocular deprivation animals were treated with vinpocetine (20mg/kg; PDE1 inhibitor), rolipram (1.25mg/kg; PDE4 inhibitor), vardenafil (3mg/kg; PDE5 inhibitor) or vehicle solution. Monocular deprivation resulted in the expected shift in ocular dominance of the binocular zone in saline controls but not in the ethanol group. While vinpocetine successfully restored ODP in the ethanol group, rolipram and vardenafil did not. However, when rolipram and vardenafil were given simultaneously ODP was restored. PDE4 and PDE5 are specific to cAMP and cGMP respectively, while PDE1 acts on both of these nucleotides. Our findings suggest that the combined activation of the cAMP and cGMP cascades may be a good approach to improve neuronal plasticity in FASD models.
Insights
Early alcohol exposure impairs brain plasticity in fetal alcohol spectrum disorders (FASD). Certain phosphodiesterase (PDE) inhibitors, particularly when combined, show promise in restoring neuronal plasticity in FASD models.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Pharmacology
Background:
- Deficits in neuronal plasticity are linked to cognitive impairments in fetal alcohol spectrum disorders (FASD).
- The precise mechanisms underlying these plasticity deficits remain unclear.
- Early alcohol exposure models the impact of prenatal alcohol consumption on brain development.
Purpose of the Study:
- To investigate the effects of early alcohol exposure on ocular dominance plasticity (ODP) in a mouse model.
- To determine if phosphodiesterase (PDE) inhibitors can reverse alcohol-induced ODP deficits.
- To explore the roles of specific PDE enzymes and cyclic nucleotide signaling pathways.
Main Methods:
- Mouse pups received alcohol (ethanol) exposure on specific postnatal days to mimic third-trimester equivalent binge drinking.
- Ocular dominance plasticity was assessed after monocular deprivation using optical imaging of intrinsic signals.
- Animals were treated with PDE1 (vinpocetine), PDE4 (rolipram), PDE5 (vardenafil) inhibitors, or vehicle during deprivation.
Main Results:
- Alcohol exposure prevented the typical shift in ocular dominance plasticity.
- Vinpocetine (PDE1 inhibitor) restored ODP in alcohol-exposed mice.
- Combined administration of rolipram (PDE4) and vardenafil (PDE5) also restored ODP, while administered alone they did not.
Conclusions:
- Early alcohol exposure disrupts neuronal plasticity, specifically ODP.
- Targeting both cAMP and cGMP signaling pathways via combined PDE inhibition may be a therapeutic strategy for FASD.
- PDE1 inhibition alone is also effective in restoring ODP in this model.
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