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Prenatal stress increases learning and memory deficits in offspring: A toxicological study on hippocampal neuronal
Ruixue Huang1, Jing Li2, Jiani Xiao3
1XiangYa School of Public Health, Central South University, Changsha 410078, China.
Insights
Prenatal stress impairs offspring learning and memory by damaging the hippocampus. This study reveals toxicological mechanisms involving neuron loss, synaptic injury, and oxidative stress, highlighting the importance of maternal well-being.
Area of Science:
- Neuroscience
- Toxicology
- Developmental Biology
Background:
- Epidemiological studies link prenatal stress to childhood learning and memory deficits.
- The precise toxicological mechanisms underlying these deficits remain largely unknown.
Purpose of the Study:
- To systematically investigate the toxicological mechanisms of prenatal stress on offspring learning and memory.
- To explore the role of hippocampal damage and related biomarkers.
Main Methods:
- A prenatal stress model was established using corticosterone (CORT) administration in pregnant rats.
- Offspring hippocampus was assessed for neuronal and synaptic damage, and neurotransmitter levels.
- Learning and memory were evaluated using the Morris water maze test.
- Biomarkers of oxidative stress and apoptosis were analyzed.
Main Results:
- Prenatal stress induced by CORT led to decreased offspring body weight and increased serum CORT.
- Hippocampal damage, including neuronal loss, synaptic injury, and reduced neurotransmitters, was observed.
- Impaired learning and memory were evidenced by longer escape latencies in the Morris water maze test.
- Biomarkers indicated increased oxidative stress, inflammation (IL-6), and apoptosis.
Conclusions:
- Prenatal stress causes hippocampus-dependent learning and memory impairments through neuronal and synaptic damage.
- Oxidative stress and apoptosis are key mechanisms contributing to these deficits.
- Promoting maternal well-being is crucial for optimal offspring cognitive development.
Background:
Recent epidemiological studies have observed that prenatal stress induced learning and memory deficits in children, but the toxicological mechanisms remain unclear.
Objectives:
We conducted a systematic study to explore the toxicological mechanisms of prenatal stress on learning and memory in offspring.
Methods:
We established a prenatal stress model by corticosterone (CORT) administration at different dose levels (0, 10, 40 mg/kg) from gestational days 14-21. First we assessed hippocampal damage in the offspring by the neuronal damage, synaptic damage, and neurotransmitter levels. We then detected learning and memory ability by Morris water maze test, and finally we analyzed biomarkers of oxidative stress and apoptosis to explore the potential mechanism.
Results:
Prenatal stress induced by CORT administration was indicated by decreased body weight, increased serum CORT and reduced food consumption (p < 0.05). With prenatal stress increasing, hippocampal damage in the offspring worsened, characterized by damaged neurons, decreased synaptic proteins, and reduced neurotransmitters. Learning and memory deficits were observed, including long escape latency and increased travel distance to find the platform in the Morris water maze test (p < 0.05).The potential toxicological mechanisms underlying the learning and memory impairments were indicated by biomarkers: decreased antioxidant enzymes (SOD and T-AOC), increased pro-inflammatory cytokines (IL-6) and apoptosis (p < 0.05).
Conclusion:
Prenatal stress leads to hippocampus-dependent learning and memory impairments by neuron loss, synaptic injury, and reduced neurotransmitters. Our study implies that improving maternal well-being is helpful for the learning and memory development of the next generation.
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