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Prenatal nicotine exposure affects hippocampal development and behavior in mouse offspring
Si-Jing Fan1, Yu Qi Zhou2, Lian Liu2
1Department of Radiology, Jingzhou Hospital Affiliated to Yangtze University, Jingzhou, Hubei 434020, China; Department of Neurology, Fengcheng People's Hospital, Fengcheng Hospital Affiliated to Yichun University, Fengcheng, Jiangxi 331100, China.
Prenatal nicotine exposure (PNE) causes lasting changes in offspring hippocampus development and neuronal structure. These changes lead to cognitive deficits and increased anxiety and depression-like behaviors in adulthood.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Prenatal nicotine exposure (PNE) is linked to behavioral abnormalities in offspring.
- The specific impact of PNE on hippocampal development and neuronal cell changes remains incompletely understood.
Purpose of the Study:
- To investigate the association between PNE and alterations in hippocampal neuronal development and cell classes.
- To correlate these neurodevelopmental changes with behavioral outcomes in offspring.
Main Methods:
- Pregnant mice received nicotine injections from gestational day 9 until parturition.
- Histological analyses (Golgi staining, immunohistochemistry) were performed on hippocampal regions (DG, CA1, CA3) at multiple postnatal days.
- Behavioral assessments were conducted from postnatal day 56 to 90.
Main Results:
- PNE induced stage-specific hippocampal alterations, including early proliferation and later suppressed dendritic arborization.
- Persistent neurogenesis deficits in the DG and reduced dendritic spine density in CA1 were observed.
- Offspring exhibited spatial learning deficits, heightened anxiety, and depression-like behaviors.
Conclusions:
- PNE significantly disrupts hippocampal development, leading to persistent structural and functional deficits.
- These neurobiological changes underlie the observed cognitive and emotional behavioral abnormalities in offspring.
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