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Assessment of Cocaine-induced Behavioral Sensitization and Conditioned Place Preference in Mice
Published on: February 18, 2016
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Sex Differences in Cocaine Sensitization Vary by Mouse Strain
Andrew D Chapp1, Chinonso A Nwakama1, Mark J Thomas1
1Department of Neuroscience and Medical Discovery Team on Addiction, University of Minnesota, Minneapolis, Minnesota, USA.
Neuroendocrinology
|April 11, 2023
Summary
Sex differences in cocaine addiction vulnerability vary significantly by genetic background in mice. Understanding these genetic factors is crucial, as sex alone provides limited insight into addiction risk.
Area of Science:
- Neuroscience
- Genetics
- Pharmacology
Background:
- Preclinical studies suggest females have higher substance abuse risk.
- Clinical data on sex differences in addiction vulnerability is less clear.
- Genetic factors significantly influence addiction vulnerability.
Purpose of the Study:
- To investigate sex differences in behavioral sensitization to cocaine across different mouse strains.
- To examine the impact of genetic background on sex-specific responses to cocaine.
Main Methods:
- Evaluated locomotor sensitization to cocaine in male and female mice from three genetically distinct strains (C57BL/6J, B6129SF2/J, DO/J).
- Administered cocaine subcutaneously for five consecutive days.
- Analyzed strain and sex-dependent variations in behavioral responses.
Main Results:
- Sex differences in cocaine-induced locomotor sensitization were strain-dependent.
- Opposing sex differences were observed in C57BL/6J (males higher) and B6129SF2/J (females higher) strains.
- No significant sex differences in sensitization were found in Diversity Outbred (DO/J) mice.
- Acute cocaine administration revealed strain differences in males but not females.
- The magnitude of sensitization varied across genetic backgrounds.
Conclusions:
- Sex differences in drug addiction are significantly modulated by genetic background.
- Genetic variability can mitigate or reverse observed sex differences in addiction vulnerability.
- In the absence of genetic information, biological sex is an unreliable predictor of individual addiction risk.
