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Prenatal stress alters limbo-corticostriatal Homer protein expression
Alexis W Ary1, Valerie R Aguilar, Karen K Szumlinski
1Department of Psychology, University of California, Santa Barbara, California 93106, USA.
Insights
Prenatal stress alters Homer protein expression in developing rat brains, impacting glutamate signaling and potentially leading to behavioral issues. These changes in Homer proteins suggest lasting effects of early life stress on brain function.
Area of Science:
- Neuroscience
- Developmental Biology
- Neurobiology
Background:
- Early environmental stress can disrupt normal brain development and function.
- Glutamate neurotransmission is crucial for brain signaling and is affected by developmental stress.
- Homer proteins are key regulators of glutamatergic signaling pathways.
Purpose of the Study:
- To investigate the impact of prenatal stress on the expression of Homer proteins in specific brain regions of developing rats.
- To understand how prenatal stress influences glutamatergic signaling through Homer protein alterations.
Main Methods:
- Prenatal stress was induced in Sprague-Dawley rats via restraint stress during the final week of gestation.
- Offspring brains were collected at 21 days of age for analysis.
- Immunoblotting was used to quantify Homer protein isoform levels in the prefrontal cortex, limbic structures, and striatum.
Main Results:
- Prenatal stress led to region-specific changes in Homer protein expression.
- Increased levels of certain Homer protein isoforms were observed in the prefrontal cortex and limbic areas.
- A reduction in Homer 1a levels was detected in the striatum.
Conclusions:
- Prenatal stress causes persistent alterations in Homer protein expression in the developing brain.
- These enduring changes in Homer proteins likely contribute to the observed abnormalities in glutamatergic neurotransmission and behavior following early life stress.
Abstract:
Early environmental stress influences developmental processes resulting in alterations in behavior and brain function, including abnormalities in glutamate neurotransmission. Here, we assessed the influence of prenatal stress on limbo-corticostriatal expression of Homer proteins that are critical elements in glutamatergic signaling. Pregnant, female Sprague-Dawley rats were subjected to either no treatment or to restraint stress 3 times per day for the last 7 days of gestation. At 21 d of age, offspring were sacrificed and brain tissue was rapidly extracted. Immunoblotting revealed regionally specific increases in certain Homer protein isoforms within prefrontal cortex and limbic structures, whereas the striatum exhibited a reduction in Homer 1a levels. These findings indicate that stress during development can produce enduring perturbations in Homer protein expression that likely contribute to glutamatergic and behavioral abnormalities observed following early environmental stress.
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