title: Neurochemical and behavioural indices of exercise reward are independent of exercise controllability.
abstract: Brain reward circuits are implicated in stress-related psychiatric disorders. Exercise reduces the incidence of stress-related disorders, but the contribution of exercise reward to stress resistance is unknown. Exercise-induced stress resistance is independent of exercise controllability; both voluntary running (VR) and forced running (FR) protect rats against the anxiety-like and depression-like behavioural consequences of stress. Voluntary exercise is a natural reward, but whether rats find FR rewarding is unknown. Moreover, the contribution of dopamine (DA) and striatal reward circuits to exercise reward is not well characterized. Adult, male rats were assigned to locked wheels, VR, or FR groups. FR rats were forced to run in a pattern resembling the natural wheel running behavior of rats. Both VR and FR increased the reward-related plasticity marker ΔFosB in the dorsal striatum and nucleus accumbens, and increased the activity of DA neurons in the lateral ventral tegmental area, as revealed by immunohistochemistry for tyrosine hydroxylase and pCREB. Both VR and FR rats developed conditioned place preference (CPP) to the side of a CPP chamber paired with exercise. Re-exposure to the exercise-paired side of the CPP chamber elicited conditioned increases in cfos mRNA in direct-pathway (dynorphin-positive) neurons in the dorsal striatum and nucleus accumbens in both VR and FR rats, and in tyrosine hydroxylase-positive neurons in the lateral ventral tegmental area of VR rats only. The results suggest that the rewarding effects of exercise are independent of exercise controllability and provide insight into the DA and striatal circuitries involved in exercise reward and exercise-induced stress resistance.
authors.affiliation: Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.
authors.forename: Jonathan J
authors.initials: JJ
authors.lastname: Herrera
authors.affiliation: Department of Psychology, University of Colorado Denver, CB 173, PO Box 173364, Denver, 80217, CO, USA.
authors.forename: Sofiya
authors.initials: S
authors.lastname: Fedynska
authors.affiliation: Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.
authors.forename: Parsa R
authors.initials: PR
authors.lastname: Ghasem
authors.affiliation: Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.
authors.forename: Tyler
authors.initials: T
authors.lastname: Wieman
authors.affiliation: Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Clark
authors.affiliation: Department of Psychology, University of Colorado Denver, CB 173, PO Box 173364, Denver, 80217, CO, USA.
authors.forename: Nathan
authors.initials: N
authors.lastname: Gray
authors.affiliation: Department of Psychology, University of Colorado Denver, CB 173, PO Box 173364, Denver, 80217, CO, USA.
authors.forename: Esteban
authors.initials: E
authors.lastname: Loetz
authors.affiliation: Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO, USA.|Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA.
authors.forename: Serge
authors.initials: S
authors.lastname: Campeau
authors.affiliation: Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.|Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA.
authors.forename: Monika
authors.initials: M
authors.lastname: Fleshner
authors.affiliation: Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.|Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA.
authors.forename: Benjamin N
authors.initials: BN
authors.lastname: Greenwood
mesh_terms: D000818:Animals; D003342:Corpus Striatum / Q000166:cytology / Q000378:metabolism / Q000502:physiology; D017362:Cyclic AMP Response Element-Binding Protein / Q000235:genetics / Q000378:metabolism; D059290:Dopaminergic Neurons / Q000378:metabolism / Q000502:physiology; D008297:Male; D009473:Neuronal Plasticity; D009714:Nucleus Accumbens / Q000166:cytology / Q000378:metabolism / Q000502:physiology; D010805:Physical Conditioning, Animal; D016760:Proto-Oncogene Proteins c-fos / Q000235:genetics / Q000378:metabolism; D051381:Rats; D011916:Rats, Inbred F344; D012201:Reward; D012420:Running; D013315:Stress, Psychological / Q000503:physiopathology*; D014446:Tyrosine 3-Monooxygenase / Q000235:genetics / Q000378:metabolism
chemical_list: D017362:Cyclic AMP Response Element-Binding Protein; D016760:Proto-Oncogene Proteins c-fos; D014446:Tyrosine 3-Monooxygenase
keywords: dopamine; immediate early genes; rat; striatum; ventral tegmental area
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