Lifelong, central corticotropin-releasing factor (CRF) overexpression is associated with individual differences in cocaine-induced conditioned place preference

Kasahara, Maki, Groenink, Lucianne, Bijlsma, Elisabeth Y., Olivier, Berend, and Sarnyai, Zoltán (2015) Lifelong, central corticotropin-releasing factor (CRF) overexpression is associated with individual differences in cocaine-induced conditioned place preference. European Journal of Pharmacology, 753. pp. 151-157.

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Abstract

Stress, through corticotropin-releasing factor (CRF), influences all aspects of cocaine addiction. Earlier studies suggest that individual differences in responsivity to stress affect susceptibility to develop addiction. We have previously found that CRF over-expression alters individual differences in behavioural responses to novelty stress in mice. Therefore, we hypothesised that post-natal, long-term over-expression of brain CRF may alter the rewarding effects of cocaine in a manner that is sensitive to individual differences. In this study we specifically investigated cocaine-induced conditioned place preference (CPP) in transgenic mice over-expressing CRF (CRF-OE) and in wild-type (WT) littermates after determining their individual locomotor and emotional responsivity to inescapable novelty. CRF-OE mice showed decreased overall locomotor activity and increased anxiety-like behaviour in response to novelty compared to WT mice. Low behavioural reactivity to novelty (LR) was associated with heightened anxiety-like behaviour in CRF-OE, but not in WT, mice. WT and CRF-OE mice developed CPP equally to both low (5 mg/kg) and high (20 mg/kg) doses of cocaine. However, LR CRF-OE mice expressed significantly stronger cocaine CPP than transgenic mice with high locomotor response to novelty (HR). In WT mice, on the other hand, stronger CPP induced by 20 mg/kg of cocaine was found in the HR animals. Furthermore, there was a strong negative correlation between locomotor reactivity to novelty and CPP in CRF-OE, but not in WT, mice. Collectively, these results suggest that long-term, post-natal CRF over-expression increases the rewarding effects of cocaine in individuals with high emotional response to stress.

Item ID: 34638
Item Type: Article (Refereed Research - C1)
Keywords: corticotropin-releasing factor; cocaine; transgenic mice; stress; reward; place preference; individual differences
ISSN: 1879-0712
Date Deposited: 19 Aug 2014 06:51
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1109 Neurosciences > 110903 Central Nervous System @ 60%
11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110319 Psychiatry (incl Psychotherapy) @ 20%
17 PSYCHOLOGY AND COGNITIVE SCIENCES > 1701 Psychology > 170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology) @ 20%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920111 Nervous System and Disorders @ 70%
92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920414 Substance Abuse @ 30%
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