Acute nicotine delays extinction of contextual fear in mice.

Abstract:

:Smoking is linked to post-traumatic stress disorder (PTSD) which suggests smoking is either a risk factor or an attempt at self-medication. The ability to reduce or extinguish fear-related memories may be altered in patients with PTSD and it is possible that nicotine modulates this. Although there are numerous studies examining the effects of nicotine on acquisition of fear learning, the effects of nicotine on extinction of contextual fear are not well understood. In the present study, we examined the effects of acute nicotine (0.18 mg/kg) on extinction of contextual fear in C57BL/6J mice. Animals were first trained in a background contextual fear conditioning paradigm using a white noise as a conditioned stimulus (CS), which co-terminated with a 2 s 0.57 mA unconditioned foot-shock stimulus (US). Animals were then administered either nicotine or saline and exposed to either the training context or a novel context in order to measure freezing to the context during extinction. Our results demonstrate that nicotine administration during extinction delays extinction of contextual freezing while nicotine did not affect cued freezing or freezing to the novel context.

journal_name

Behav Brain Res

authors

Kutlu MG,Gould TJ

doi

10.1016/j.bbr.2014.01.031

subject

Has Abstract

pub_date

2014-04-15 00:00:00

pages

133-7

eissn

0166-4328

issn

1872-7549

pii

S0166-4328(14)00045-X

journal_volume

263

pub_type

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