Adolescent mice are less sensitive to the effects of acute nicotine on context pre-exposure than adults

Munir Gunes Kutlu, David C. Braak, Jessica M. Tumolo, Thomas J. Gould

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Adolescence is a critical developmental period associated with both increased vulnerability to substance abuse and maturation of certain brain regions important for learning and memory such as the hippocampus. In this study, we employed a hippocampus-dependent learning context pre-exposure facilitation effect (CPFE) paradigm in order to test the effects of acute nicotine on contextual processing during adolescence (post-natal day (PND) 38) and adulthood (PND 53). In Experiment 1, adolescent or adult C57BL6/J mice received either saline or one of three nicotine doses (0.09, 0.18, and 0.36 mg/kg) prior to contextual pre-exposure and testing. Our results demonstrated that both adolescent and adult mice showed CPFE in the saline groups. However, adolescent mice only showed acute nicotine enhancement of CPFE with the highest nicotine dose whereas adult mice showed the enhancing effects of acute nicotine with all three doses. In Experiment 2, to determine if the lack of nicotine's effects on CPFE shown by adolescent mice is specific to the age when they are tested, mice were either given contextual pre-exposure during adolescence or adulthood and received immediate shock and testing during adulthood after a 15 day delay. We found that both adolescent and adult mice showed CPFE in the saline groups when tested during adulthood. However, like Experiment 1, mice that received contextual pre-exposure during adolescence did not show acute nicotine enhancement except at the highest dose (0.36 mg/kg) whereas both low (0.09 mg/kg) and high (0.36 mg/kg) doses enhanced CPFE in adult mice. Finally, we showed that the enhanced freezing response found with 0.36 mg/kg nicotine in the 15-day experiment may be a result of decreased locomotor activity as mice that received this dose of nicotine traveled shorter distances in an open field paradigm. Overall, our results indicate that while adolescent mice showed normal contextual processing when tested both during adolescence and adulthood, they are less sensitive to the enhancing effects of nicotine on contextual processing.

Original languageEnglish (US)
Pages (from-to)445-451
Number of pages7
JournalBrain research
Volume1642
DOIs
StatePublished - Jul 1 2016

Fingerprint

Nicotine
Hippocampus
Learning
Locomotion
Freezing
Substance-Related Disorders
Shock
Brain

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Molecular Biology
  • Developmental Biology
  • Clinical Neurology

Cite this

Kutlu, Munir Gunes ; Braak, David C. ; Tumolo, Jessica M. ; Gould, Thomas J. / Adolescent mice are less sensitive to the effects of acute nicotine on context pre-exposure than adults. In: Brain research. 2016 ; Vol. 1642. pp. 445-451.
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abstract = "Adolescence is a critical developmental period associated with both increased vulnerability to substance abuse and maturation of certain brain regions important for learning and memory such as the hippocampus. In this study, we employed a hippocampus-dependent learning context pre-exposure facilitation effect (CPFE) paradigm in order to test the effects of acute nicotine on contextual processing during adolescence (post-natal day (PND) 38) and adulthood (PND 53). In Experiment 1, adolescent or adult C57BL6/J mice received either saline or one of three nicotine doses (0.09, 0.18, and 0.36 mg/kg) prior to contextual pre-exposure and testing. Our results demonstrated that both adolescent and adult mice showed CPFE in the saline groups. However, adolescent mice only showed acute nicotine enhancement of CPFE with the highest nicotine dose whereas adult mice showed the enhancing effects of acute nicotine with all three doses. In Experiment 2, to determine if the lack of nicotine's effects on CPFE shown by adolescent mice is specific to the age when they are tested, mice were either given contextual pre-exposure during adolescence or adulthood and received immediate shock and testing during adulthood after a 15 day delay. We found that both adolescent and adult mice showed CPFE in the saline groups when tested during adulthood. However, like Experiment 1, mice that received contextual pre-exposure during adolescence did not show acute nicotine enhancement except at the highest dose (0.36 mg/kg) whereas both low (0.09 mg/kg) and high (0.36 mg/kg) doses enhanced CPFE in adult mice. Finally, we showed that the enhanced freezing response found with 0.36 mg/kg nicotine in the 15-day experiment may be a result of decreased locomotor activity as mice that received this dose of nicotine traveled shorter distances in an open field paradigm. Overall, our results indicate that while adolescent mice showed normal contextual processing when tested both during adolescence and adulthood, they are less sensitive to the enhancing effects of nicotine on contextual processing.",
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Adolescent mice are less sensitive to the effects of acute nicotine on context pre-exposure than adults. / Kutlu, Munir Gunes; Braak, David C.; Tumolo, Jessica M.; Gould, Thomas J.

In: Brain research, Vol. 1642, 01.07.2016, p. 445-451.

Research output: Contribution to journalArticle

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