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Assessment and Evaluation of the High Risk Neonate: The NICU Network Neurobehavioral Scale
Published on: August 25, 2014
Behavioral teratogenicity induced by nonforced maternal nicotine consumption
Rodrigo Paz1, Brigg Barsness, Trevor Martenson
1Department of Neurosciences, University of New Mexico, Albuquerque, NM 87131-0001, USA.
Summary
Prenatal nicotine exposure (PNE) directly impacts offspring behavior, increasing risks for ADHD, depression, and addiction. This study confirms PNE
Area of Science:
- Neuroscience
- Developmental Psychology
- Toxicology
Background:
- Prenatal nicotine exposure (PNE) is linked to ADHD, MDD, and substance abuse.
- Previous animal models used forced nicotine administration, questioning specificity.
- The direct impact of PNE on offspring neurodevelopment requires further investigation.
Purpose of the Study:
- To investigate the direct behavioral effects of PNE in mice using a voluntary exposure model.
- To assess the influence of PNE on locomotion, learning, addiction, and depression-like behaviors.
- To clarify whether observed effects are due to nicotine itself or confounding factors.
Main Methods:
- Pregnant mice voluntarily consumed nicotine solutions or water.
- Offspring were evaluated for spontaneous locomotion, fear conditioning, conditioned place preference, and learned helplessness.
- Control groups received saccharin solutions or water without nicotine.
Main Results:
- PNE significantly affected spontaneous locomotion and conditioned place preference for a cocaine-associated place.
- PNE offspring showed altered responses in the learned helplessness paradigm.
- Surprisingly, PNE enhanced the learning of fear-associated cues in trace conditioning.
Conclusions:
- Voluntary PNE directly causes behavioral changes in offspring, supporting a teratogenic effect.
- Observed hyperlocomotive behavior is likely not an artifact of forced administration.
- PNE may be a risk factor for conditions involving fear-associated learning, such as PTSD.
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