Characterizing cerebral metabolite profiles in anorexia and bulimia nervosa and their associations with habitual behavior.
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Authors
Murley, Alexander G
Diederen, Kelly MJ
Carpenter, T Adrian
Publication Date
2022-03-15Journal Title
Transl Psychiatry
ISSN
2158-3188
Publisher
Nature Publishing Group
Type
Article
This Version
AM
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Westwater, M. L., Murley, A. G., Diederen, K. M., Carpenter, T. A., Ziauddeen, H., & Fletcher, P. (2022). Characterizing cerebral metabolite profiles in anorexia and bulimia nervosa and their associations with habitual behavior.. Transl Psychiatry https://doi.org/10.1038/s41398-022-01872-7
Abstract
Anorexia nervosa (AN) and bulimia nervosa (BN) are associated with altered brain structure and function, as well as increased habitual behavior. This neurobehavioral profile may implicate neurochemical changes in the pathogenesis of these illnesses. Altered glutamate, myo-inositol and N-acetyl aspartate (NAA) concentrations are reported in restrictive AN, yet whether these extend to binge-eating disorders, or relate to habitual traits in affected individuals, remains unknown. We therefore used single-voxel proton magnetic resonance spectroscopy to measure glutamate, myo-inositol, and NAA in the right inferior lateral prefrontal cortex and the right occipital cortex of 85 women [n = 22 AN (binge-eating/purging subtype; AN-BP), n = 33 BN, n = 30 controls]. To index habitual behavior, participants performed an instrumental learning task and completed the Creature of Habit Scale. Women with AN-BP, but not BN, had reduced myo-inositol and NAA concentrations relative to controls in both regions. Although patient groups had intact instrumental learning task performance, both groups reported increased routine behaviors compared to controls, and automaticity was related to reduced prefrontal glutamate and NAA participants with AN-BP. Our findings extend previous reports of reduced myo-inositol and NAA levels in restrictive AN to AN-BP, which may reflect disrupted axonal-glial signaling. Although we found inconsistent support for increased habitual behavior in AN-BP and BN, we identified preliminary associations between prefrontal metabolites and automaticity in AN-BP. These results provide further evidence of unique neurobiological profiles across binge-eating disorders.
Sponsorship
Bernard Wolfe Health Neuroscience Fund
Funder references
Wellcome Trust (206368/Z/17/Z)
Wellcome Trust (100574/B/12/Z)
National Institute for Health Research (NIHRDH-IS-BRC-1215-20014)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1038/s41398-022-01872-7
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334288
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