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Dentate granule cell function after neonatal treatment with parachloroamphetamine or 5,7-dihydroxytryptamine
1Department of Anatomy and Neurobiology, Saint Louis University Health Sciences Center, 1402 S. Grand Boulevard, St. Louis, MO 63122, USA. haring@slu.edu
Insights
Neonatal treatments with post-weaning cold exposure (PCA) or 5,7-dihydroxytryptamine (5,7-DHT) reduced synaptic drive in rat granule cells. PCA also impaired synaptic potentiation, suggesting lasting effects on neural plasticity.
Area of Science:
- Neuroscience
- Electrophysiology
- Cellular Biology
Background:
- Neonatal insults can impact brain development and function.
- Serotonergic pathways and environmental factors are crucial for neural development.
Purpose of the Study:
- To investigate the long-term effects of neonatal post-weaning cold exposure (PCA) and 5,7-dihydroxytryptamine (5,7-DHT) on rat granule cell electrophysiology.
- To assess synaptic function and plasticity in the hippocampus following early-life challenges.
Main Methods:
- In vitro extracellular electrophysiological recordings were performed on P60 rat hippocampal slices.
- Granule cell population excitatory postsynaptic potentials (EPSPs) and spike responses were measured.
- Paired-pulse facilitation and long-term potentiation (LTP) were assessed to evaluate synaptic function and plasticity.
Main Results:
- Granule cell population EPSP and spike responses were within the normal range for both PCA and 5,7-DHT groups.
- Paired-pulse facilitation was reduced in both PCA and 5,7-DHT groups, indicating diminished synaptic drive.
- Synaptic potentiation was significantly reduced in slices from PCA-treated rats but not in the 5,7-DHT group compared to controls.
Conclusions:
- Neonatal PCA and 5,7-DHT treatments lead to reduced synaptic drive in rat granule cells.
- Neonatal PCA specifically impairs synaptic potentiation, suggesting a lasting deficit in hippocampal plasticity.
- These findings highlight the vulnerability of the developing hippocampus to early-life stress and neurochemical alterations.
Abstract:
In vitro, extracellular electrophysiological recording was used to test granule cell responses in P60 rats after neonatal PCA and 5, 7-DHT. Granule cell population EPSP and spike responses were in the normal range for both PCA and 5,7-DHT groups. However, the degree of paired pulse facilitation was reduced in both of these groups relative to control, reflecting a diminished synaptic drive. Synaptic potentiation in the 5,7-DHT group was not different from control, but was significantly reduced in slices from PCA-treated rats.