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Footshock stress alters early postnatal development of electrophysiological responses and caspase-3 activity in rat
Igor E Kudryashov1, Alexander A Yakovlev, IrinaV Kudryashova
1Department of Neuroontogenesis, Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, 5a Butlerov Str, Moscow 117865, Russia.
Insights
Early life stress, like footshock, enhances hippocampal circuitry development in rats. This leads to increased population spike amplitudes and reduced neuronal loss, suggesting improved brain function.
Area of Science:
- Neuroscience
- Developmental Neurobiology
- Stress and Brain Development
Background:
- Postnatal development of the hippocampus is crucial for cognitive functions.
- Early life stress can significantly impact brain development and function.
- Understanding the effects of stress on hippocampal circuitry is vital.
Purpose of the Study:
- To investigate the effects of early life footshock stress on hippocampal population spike (PS) amplitudes and caspase-3 activity during postnatal development.
- To determine if early stress alters neuronal survival and synaptic development in the rat hippocampus.
Main Methods:
- Comparison of hippocampal PS amplitudes and caspase-3 activity in control and footshock-exposed rats from postnatal day (PD) 14 to PD 27.
- Electrophysiological recordings to measure PS amplitudes.
- Biochemical assays to quantify caspase-3 activity.
Main Results:
- Footshock on PD 13 transiently increased maximal PS amplitudes (PD 14-16), with differences diminishing by PD 21.
- No difference in caspase-3 activity was observed between groups from PD 14-17, but it was lower in the footshock group from PD 18-21.
- PS amplitudes significantly increased in the footshock group between PD 22-27.
Conclusions:
- Early life footshock stress appears to activate hippocampal circuitry development.
- This activation may involve increased synaptic connections and reduced neuronal loss, leading to enhanced responsiveness.
- The findings suggest a potential mechanism for how early stress can shape long-term brain function.
Abstract:
Postnatal changes in population spike (PS) amplitudes and caspase-3 activity were compared in the hippocampi of control rats and experimental animals subjected to a brief footshock on postnatal day (PD) 13. Footshock induced an increase in maximal PS amplitudes during the early period (from PD 14 to PD 16), however, the difference between stressed and control animals gradually decreased with age up to PD 21. No difference between hippocampal caspase-3 activity in control and footshock groups was revealed within the PD 14-17. However, caspase-3 activity in the latter group was significantly lower over the next period of postnatal development (PD 18-21). PS amplitudes in the slices of the footshock group significantly increased over PD 22-27. We suggest that footshock activates the development of hippocampal circuitry during early phases, this phenomenon mediating enhanced responsiveness as a result of an increased production of synaptic connections and related decrease in neuronal loss.
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