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Individual differences in risk-related behaviors and voluntary alcohol intake in outbred Wistar rats
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences. (Neuropharmacology, Addiction and Behaviour)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences. (Neuropharmacology, Addiction and Behaviour)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Forensic Medicine.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences. (Neuropharmacology, Addiction and Behaviour)
2014 (English)In: Behavioural Pharmacology, ISSN 0955-8810, E-ISSN 1473-5849, Vol. 25, no 3, 206-215 p.Article in journal (Refereed) Published
Abstract [en]

Some personality traits and comorbid psychiatric diseases are linked to a propensity for excessive alcohol drinking. The objective of this study was to investigate the association between individual differences in risk-related behaviors, voluntary alcohol intake and preference. Outbred male Wistar rats were tested in a novel open field, followed by assessment of behavioral profiles using the multivariate concentric square field (MCSF) test. Animals were classified into high risk taking and low risk taking on the basis of open-field behavior and into high risk-assessing (HRA) and low risk-assessing (LRA) on the basis of the MCSF profile. Finally, voluntary alcohol intake was investigated using intermittent access to 20% ethanol and water for 5 weeks. Only minor differences in voluntary alcohol intake were found between high risk taking and low risk taking. Differences between HRA and LRA rats were more evident, with higher intake and increased intake over time in HRA relative to LRA rats. Thus, individual differences in risk-assessment behavior showed greater differences in voluntary alcohol intake than risk taking. The findings may relate to human constructs of decision-making and risk taking associated with a predisposition to rewarding and addictive behaviors. Further studies are needed to clarify the relationship between risk-related behaviors, including risk-assessment behavior, and liability for excessive alcohol intake.

Place, publisher, year, edition, pages
2014. Vol. 25, no 3, 206-215 p.
National Category
Neurosciences
Identifiers
URN: urn:nbn:se:uu:diva-224079DOI: 10.1097/FBP.0000000000000036ISI: 000335578800003PubMedID: 24776488OAI: oai:DiVA.org:uu-224079DiVA: diva2:715248
Available from: 2014-05-02 Created: 2014-05-02 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Individual differences in behavior, neurochemistry and pharmacology associated with voluntary alcohol intake
Open this publication in new window or tab >>Individual differences in behavior, neurochemistry and pharmacology associated with voluntary alcohol intake
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Alcohol use disorder is a worldwide public health problem and is a disorder with substantial individual variation. There are suggested links between various behavioral traits, comorbid psychiatric diseases and excessive alcohol consumption. Moreover, the endogenous opioid system is involved in alcohol reward and reinforcement, and implicated in the action of alcohol. However, less is known about the complex associations between individual differences in behavior, alcohol consumption, pharmacotherapy response and related neurochemical mechanisms. Experimental animal models are critical for understanding the neurobiological underpinnings of alcohol use disorder.

The overall aims of this thesis were: i) to study the association between behavior and voluntary alcohol intake in outbred rats; ii) to study the association of voluntary alcohol intake, behavior, opioid receptor density and response to naltrexone; and iii) to obtain detailed behavioral characterizations of the animals on the basis of their voluntary alcohol intake.

The results revealed that the multivariate concentric square fieldTM (MCSF) test was a complementary method for understanding mechanisms underlying various mental states. The MCSF broadened the perspective on risk-related behaviors, including aspects of risk assessment. Individual differences in alcohol intake using the modified intermittent access paradigm enabled analyses of drinking patterns in high and low alcohol-drinking rats. There was an alcohol deprivation effect in high-drinking animals only. The behavior profiling of high alcohol drinking- rats before and after alcohol access suggested that this subgroup was consuming alcohol for its anxiolytic properties. Long-lasting changes were found in the mu and the delta opioid receptors after long-term, intermittent voluntary alcohol intake; some of these changes are in line with findings in humans. The voluntary alcohol consumption and the concomitant response to naltrexone were different for Wistar rats from different suppliers. Moreover, the Rcc Wistar rats may be more suitable for studies of alcohol use disorders due to increasing alcohol intake and the presence of a high-drinking subpopulation with increasing alcohol intake over time. The high-drinking subpopulation showed pronounced effects of naltrexone on alcohol intake.

In conclusion, studies of individual differences increase understanding of variability in behavior, pharmacotherapy response and factors involved in vulnerability of alcohol use disorders.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2015. 76 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, ISSN 1651-6192 ; 205
Keyword
intermittent access, multivariate concentric square field, open field, risk assessment, risk taking, individual difference, behavior, strain variation, endogenous opioid system, naltrexone
National Category
Basic Medicine
Research subject
Pharmaceutical Science
Identifiers
urn:nbn:se:uu:diva-264584 (URN)978-91-554-9378-3 (ISBN)
Public defence
2015-12-04, B21, BMC, Husargatan 3, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2015-11-12 Created: 2015-10-15 Last updated: 2015-11-13

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Momeni, ShimaÅgren, GretaRoman, Erika

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