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Cholinergic effects on fear conditioning II: nicotinic and muscarinic modulations of atropine-induced disruption of the degraded contingency effect

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Abstract

Rationale

In a companion study (Carnicella et al., 2005), we showed that the muscarinic antagonist atropine, when administered after extensive training during both conditioning and testing, affected neither cued nor contextual fear memories when both of them did not compete for the control of the overt behaviour. In contrast, atropine altered the degraded contingency effect (DCE), that is, the processes by which contextual fear memory competes with the cued one for the control of the conditioned response. Atropine-induced disruption of the DCE was fully reversed by the administration of the anticholinesterase inhibitor physostigmine, which suggests a direct cholinergic implication.

Objective

The present series of experiments was conducted in order to define more precisely the involvement of the cholinergic system in such an effect.

Methods

Oxotremorine (0.0, 0.0075, 0.015, or 0.03 mg/kg), pilocarpine (0.0, 0.3, 1, or 3 mg/kg), xanomeline (0.0, 2.5, 5.0, 10.0 or 20.0 mg/kg) and nicotine (0.0, 0.1, 0.2, or 0.4 mg/kg) were tested for reversal of the atropine-induced alteration of the DCE.

Results

Oxotremorine and pilocarpine did not reverse the atropine-induced alteration of the DCE. In contrast, xanomeline and nicotine reversed the effect of atropine on the DCE.

Conclusion

The present series of experiments reveals complex pharmacological interactions within the cholinergic system when cued and contextual fear memories interact. Results are discussed in this connection and with regard to the relation between the properties of cholinergic agonists and their therapeutic values.

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Acknowledgements

We thank Prof. J.C. Stoclet for the time he devoted to this study. This study was supported by MENRT “Action Concertée Incitative Cognitique” grant 1A019F and Fondation NRJ-Institut de France. Sebastien Carnicella was supported by a French predoctoral fellowship from the MNERT. Xanomeline was generously provided by Lilly Research Company, Indianapolis, USA. We would like to thank Raymond Willhelm for the care he lavished on the rats. Thanks are also due to Andrew Wright for his help with the English language.

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Correspondence to Philippe Oberling.

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Carnicella, S., Pain, L. & Oberling, P. Cholinergic effects on fear conditioning II: nicotinic and muscarinic modulations of atropine-induced disruption of the degraded contingency effect. Psychopharmacology 178, 533–541 (2005). https://doi.org/10.1007/s00213-004-2101-6

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