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08:47
Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration
Published on: February 10, 2012
Individual differences in responses to nicotine: tracking changes from adolescence to adulthood
Ming Li1, Alexa Mead, Rick A Bevins
1Department of Psychology, University of Nebraska-Lincoln, Lincoln, NE 68588-0308, USA. mli2@unl.edu
Acta Pharmacologica Sinica
|June 6, 2009
Summary
Adolescent nicotine exposure in rats predicts adult responses and may impair sensorimotor gating. Individual differences in nicotine sensitivity persist from adolescence to adulthood.
Area of Science:
- Neuroscience
- Pharmacology
- Developmental Psychology
Background:
- Nicotine's psychostimulating effects are well-documented.
- Adolescence is a critical period for brain development and heightened vulnerability to substance exposure.
- Individual differences in drug response are significant but not fully understood across developmental stages.
Purpose of the Study:
- To determine if individual differences in nicotine response during adolescence predict adult responses in rats.
- To investigate the long-term effects of adolescent nicotine exposure on sensorimotor gating, specifically prepulse inhibition (PPI).
Main Methods:
- Adolescent rats received daily subcutaneous nicotine injections (0.10–0.60 mg/kg) or saline for 8 days, with motor activity monitored.
- Adult rats were re-exposed to the same nicotine doses or saline.
- Prepulse inhibition (PPI) of the acoustic startle response was assessed post-treatment.
Main Results:
- Nicotine increased motor activity dose-dependently in both adolescent and adult rats.
- Motor activity responses to nicotine were positively correlated between adolescent and adult phases.
- Adolescent nicotine exposure (0.4 mg/kg) disrupted PPI, indicating impaired sensorimotor gating, while adult exposure did not.
Conclusions:
- Adolescent rats exhibit heightened sensitivity to nicotine's stimulant effects and reduced sensitivity to its aversive effects.
- Nicotine exposure during adolescence may lead to lasting deficits in sensorimotor gating abilities.
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