The impact of a high-fat diet on physical activity and dopamine neurochemistry in the striatum is sex and strain dependent in C57BL/6J and DBA/2J mice
Autor: | Keith M. Erikson, Derek M. Pierce, Melissa Totten, Steve C. Fordahl, Conner W. Wallace |
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Rok vydání: | 2021 |
Předmět: |
Male
medicine.medical_specialty Dopamine Medicine (miscellaneous) Striatum Nucleus accumbens Biology Diet High-Fat Open field Reuptake Mice Internal medicine Dopamine receptor D2 medicine Animals Neurochemistry Obesity Nutrition and Dietetics Tyrosine hydroxylase General Neuroscience General Medicine Mice Inbred C57BL Endocrinology Mice Inbred DBA Female medicine.drug |
Zdroj: | Nutritional Neuroscience. 25:2601-2615 |
ISSN: | 1476-8305 1028-415X |
Popis: | BACKGROUND Obesity has been linked to behavioral and biochemical changes, such as reduced physical activity, dysregulated dopamine metabolism, and gene expression alterations in the brain. The impact of a continuous high-fat diet and resulting state of obesity may vary depending on sex and genetics. OBJECTIVE The aim of this study was to investigate the impact of a high-fat diet on physical activity, gene expression in the striatum, and dopamine neurochemistry using male and female mice from different strains as a model to examine sex and strain influences on dopamine-mediated behavior and neurobiology. METHODS Male and female mice from the C57BL/6J (B6J) and DBA/2J (D2J) strains were randomly assigned a control low-fat diet with 10% kcal fat or a high-fat diet with 60% kcal fat for 16 weeks. We assessed ambulation and habituation using the open field test; dopamine release and reuptake using ex-vivo fast scan cyclic voltammetry; and striatal mRNA expression of dopamine receptor D2, alpha synuclein, and tyrosine hydroxylase. RESULTS Mice fed a high-fat diet exhibited reduced motor activity, but only obese B6J male mice displayed reduced habituation. Dopamine clearance in the dorsal striatum was reduced only in obese D2J mice, while dopamine clearance in the nucleus accumbens core was reduced only in male obese D2J mice. Striatal dopamine receptor D2 gene expression was upregulated exclusively in obese male B6J mice. CONCLUSION Our study provides evidence for important sex and strain influences on the impact of a high-fat diet and obesity-induced behavior alterations and neurobiology dysregulation in the striatum. |
Databáze: | OpenAIRE |
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