beta2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice.

beta2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice. Research Abstract Details 

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beta2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice. Abstract Text:

Jennifer A Davis,Thomas J Gould,

RATIONALE: Previous research indicates that acute nicotine administration enhances the acquisition of contextual fear conditioning and trace cued fear conditioning. Pharmacological inhibition of alpha4beta2 nicotinic acetylcholine receptors (nAChRs), but not alpha7 nAChRs, blocked the enhancing effect of nicotine on contextual fear conditioning. Similarly, genetic deletion of the beta2 nAChR subunit but not the alpha7 nAChR subunit blocked the enhancing effect of nicotine on contextual fear conditioning. OBJECTIVES: In the present study, nAChR subunit knockout mice were used to compare the involvement of beta2 subunit-containing nAChRs and alpha7 subunit-containing nAChRs in the effects of nicotine on hippocampus-dependent trace cued fear conditioning and contextual fear conditioning. METHODS: beta2 nAChR subunit knockout mice, alpha7 nAChR subunit knockout mice, and their wild-type littermates received either nicotine or saline 5 minutes before training and testing. Mice were trained using five conditioned stimulus (CS; 30 s, 85 dB white noise)--trace (30 s)--unconditioned stimulus (US; 2 s footshock) pairings. Freezing to the context and freezing to the CS were assessed 24 h later. RESULTS: Both contextual and trace cued fear conditioning were enhanced by nicotine administration in wild-type littermates and in alpha7 nAChR subunit knockout mice. In contrast, neither contextual fear conditioning nor trace cued fear conditioning was enhanced by nicotine administration in beta2 nAChR subunit knockout mice. CONCLUSIONS: These results suggest that beta2 subunit-containing nAChRs but not alpha7 nAChR subunit-containing nAChRs are critically involved in the enhancing effect of nicotine on contextual and trace cued fear conditioning.

beta2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice. Publishing Authors By Initials

JA Davis,TJ Gould,

For similar natural sciences: time: time factors research abstracts see: natural sciences: time: time factors research

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beta2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Psychopharmacology

VOLUME: 190

Page Numbers: 343-52

Journal Abbreviation: Psychopharmacology (Berl.)

ISSN: 0033-3158

DAY: 30

MONTH: 11

YEAR: 2006

beta2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 7608025

beta2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice. Keywords Mesh Terms:

KEYWORDS: Time Factors

MESH TERMS: physiology

Chemical & Substance for Abstract: beta2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice. Information

Substance Name: Nicotine

Registry Number: 54-11-5

Grant and Affiliation Information for beta2 subunit-containing nicotinic receptors mediate the enhancing effect of nicotine on trace cued fear conditioning in C57BL/6 mice.

AFFILIATION: Department of Psychology, Weiss Hall, Temple University, Philadelphia, PA, 19122, USA.

Country: Germany

AGENCY: United States NIDA

GRANT: T32DA07237

ACRONYM: DA

MEDLINETA: Psychopharmacology (Berl)

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