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Effects of CRF1 receptor antagonists and benzodiazepines in the Morris water maze and delayed non-matching to position tests

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Abstract

Rationale

Benzodiazepines continue to be widely used for the treatment of anxiety, but it is well known that benzodiazepines have undesirable side effects, including sedation, ataxia, cognitive deficits and the risk of addiction and abuse. CRF1 receptor antagonists are being developed as potential novel anxiolytics, but while CRF1 receptor antagonists seem to have a better side-effect profile than benzodiazepines with respect to sedation and ataxia, the effects of CRF1 receptor antagonists on cognitive function have not been well characterized. It is somewhat surprising that the potential cognitive effects of CRF1 receptor antagonists have not been more fully characterized since there is some evidence to suggest that these compounds may impair cognitive function.

Objective

The Morris water maze and the delayed non-matching to position test are sensitive tests of a range of cognitive functions, including spatial learning, attention and short-term memory, so the objective of the present experiments was to assess the effects of benzodiazepines and CRF1 receptor antagonists in these tests.

Results

The benzodiazepines chlordiazepoxide and alprazolam disrupted performance in the Morris water maze and delayed non-matching to position at doses close to their therapeutic, anxiolytic doses. In contrast, the CRF1 receptor antagonists DMP-904 and DMP-696 produced little or no impairment in the Morris water maze or delayed non-matching to position test even at doses 10-fold higher than were necessary to produce anxiolytic effects.

Conclusions

The results of the present experiments suggest that, with respect to their effects on cognitive functions, CRF1 receptor antagonists seem to have a wider therapeutic index than benzodiazepines.

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Correspondence to Mark D. Lindner.

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Hogan, J.B., Hodges, D.B., Lelas, S. et al. Effects of CRF1 receptor antagonists and benzodiazepines in the Morris water maze and delayed non-matching to position tests. Psychopharmacology 178, 410–419 (2005). https://doi.org/10.1007/s00213-004-2028-y

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  • DOI: https://doi.org/10.1007/s00213-004-2028-y

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