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Episodic exposure to ethanol during development differentially affects brainstem nuclei in the macaque.
1Department of Neuroscience and Physiology, SUNY Upstate Medical University, Syracuse, NY 13210, USA.
Journal of Neurocytology
|March 11, 2003
Summary
Developmental ethanol exposure selectively impacts specific brainstem nuclei in Macaca nemestrina. Neuron loss was observed in the trigeminal motor (MoV) and medial superior olivary (MSO) nuclei, but not the facial motor (MoVII) nucleus.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Ethanol's neuroteratogenic effects are complex and may depend on developmental timing and brain region.
- Previous research suggests non-specific neuronal vulnerability to ethanol during development.
Purpose of the Study:
- To investigate the differential effects of developmental ethanol exposure on specific brainstem nuclei in Macaca nemestrina.
- To determine if ethanol exposure impacts neuronal number and nuclear volume in a targeted manner.
Main Methods:
- Macaca nemestrina were exposed to ethanol or a control solution weekly throughout gestation (6 or 24 weeks).
- Stereological analysis was used to quantify neuron number and nuclear volume in the trigeminal motor (MoV), facial motor (MoVII), and medial superior olivary (MSO) nuclei of mature offspring.
Main Results:
- Ethanol exposure significantly reduced neuron number in the MoV and MSO nuclei.
- The MoVII nucleus showed no significant change in neuron number following ethanol exposure.
- No significant effects of ethanol were observed on brainstem weight or the volume of the examined nuclei.
Conclusions:
- Developmental ethanol exposure exerts targeted, region-specific effects on brainstem nuclei, challenging the notion of non-specific vulnerability.
- Significant neurological deficits can occur due to ethanol exposure without detectable gross morphological changes in brain structures.