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Corticotropin releasing factor antagonist, α-helical CRF9–41, reverses nicotine-induced conditioned, but not unconditioned, anxiety

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Abstract

Rationale

Unconditioned anxiogenic effects of nicotine have been observed in the social interaction (SI) test 5 min after injection of a low dose and both 5 min and 30 min after injection of a high dose. Conditioned anxiety has also been observed 24 h after testing in the SI with a high dose of nicotine.

Objectives

In order to determine whether these three anxiogenic effects shared a common mechanism, we investigated the role of corticotropin releasing factor (CRF). We therefore examined whether the CRF antagonist α-helical CRF9–41 could block these three anxiogenic effects of nicotine.

Methods

To test the unconditioned anxiogenic effects, pairs of male rats were tested in SI 5 min after s.c. vehicle or nicotine (0.1 mg/kg) or 30 min after s.c. vehicle or nicotine (0.45 mg/kg), and 30 min after i.c.v. artificial cerebrospinal fluid (aCSF) or α-helical CRF9–41. To test conditioned anxiety, rats were exposed to the SI test on day 1, 5 min after vehicle or nicotine (0.1 mg/kg). On day 2, they were re-tested in SI 30 min after i.c.v. aCSF or α-helical CRF9–41 (5 μg).

Results

α-Helical CRF9–41 did not block the unconditioned anxiogenic effect of either dose of nicotine. Nicotine (0.1 mg/kg, 5 min) elicited a conditioned anxiogenic response that was significantly reversed by α-helical CRF9–41. The CRF antagonist alone had no effect.

Conclusions

CRF is an important mediator of the conditioned anxiety to nicotine, but may not play a role in mediating the acute anxiogenic effects.

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Acknowledgements

This study was supported by a grant from the CONICIT-ULA, Venezuela. We are indebted to Dr. J. Rivier for the generous gift of α-helical CRF9–41 and to Dr A. Dunn for his advice.

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Correspondence to Sonia Tucci.

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Tucci, S., Cheeta, S., Seth, P. et al. Corticotropin releasing factor antagonist, α-helical CRF9–41, reverses nicotine-induced conditioned, but not unconditioned, anxiety. Psychopharmacology 167, 251–256 (2003). https://doi.org/10.1007/s00213-003-1403-4

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  • DOI: https://doi.org/10.1007/s00213-003-1403-4

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