Abstract
Early life alteration in the activity of gamma-aminobutyric acid (GABA) receptors is associated with long-lasting developmental effects on the brain and behavior. GABAA receptors act as excitatory rather than inhibitory in neonates. Excessive activation of GABAA receptors during the early postnatal period may affect cognitive functions later in life. In this study, we sought to determine whether neonatal activation of GABAA receptors with muscimol can alter the electrophysiology profile of hippocampal CA1 neurons and spatial learning and memory in adult rats. Male and female Wistar rat pups received a subcutaneous injection of either saline or muscimol (500 µg/kg) on postnatal days (PND) 7, 9, and 11 and then underwent different electrophysiology and behavioral experiments in adulthood. Early life treatment with muscimol did not alter the basic synaptic transmission but significantly reduced the paired-pulse facilitation (PPF) in the CA1 area. Neonatal application of muscimol led to a pronounced decrease in long-term potentiation (LTP) and long-term depression (LTD) in CA1 neurons along with a declined theta-burst responses in both sexes. We obtained some evidence that neonatal GABAA activation leads to reduced brain-derived neurotrophic factor (BDNF) in the hippocampus and prefrontal cortex. Our electrophysiology data was supported with spatial reference and working memory deficits in rats. This study provides the first detailed description of altered electrophysiology in hippocampal CA1 neurons in adult rats undergone GABAA activation early in life.
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Data Availability
The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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The authors would like to acknowledge the Department of Physiology and Pharmacology for their technical support.
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This study was supported by a grant from the Vice-Chancellor of Research of Ardabil University of Medical Sciences (GN-064).
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Mohammad Amani designed the study, supervised the experiments, performed the electrophysiology and data analyses, and wrote the manuscript. Forouzan Mohammadian and Nastaran Golitabari performed the behavioral experiments. Ali-Akbar Salari contributed to biochemistry and reviewed the manuscript. All authors contributed to and have approved the final manuscript.
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All experimental procedures were conducted according to the guidelines for animal experimentation of the Ardabil University of Medical Sciences and animal experiments were approved by the local ethics committee (under grant GN-064).
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Amani, M., Mohammadian, F., Golitabari, N. et al. Postnatal GABAA Receptor Activation Alters Synaptic Plasticity and Cognition in Adult Wistar Rats. Mol Neurobiol 59, 3585–3599 (2022). https://doi.org/10.1007/s12035-022-02805-7
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DOI: https://doi.org/10.1007/s12035-022-02805-7