The role of functional and structural properties of the nucleus accumbens subregions in eating behavior regulation of bulimia nervosa

Author:

Wang Yiling1ORCID,Tang Lirong23,Wang Miao4,Wu Guowei5,Li Weihua1,Wang Xuemei23,Wang Jiani1ORCID,Yang Zhenghan1,Li Xiaohong23,Li Zhanjiang23,Chen Qian1ORCID,Zhang Peng1,Wang Zhenchang1

Affiliation:

1. Department of Radiology, Beijing Friendship Hospital Capital Medical University Beijing China

2. Beijing Anding Hospital Capital Medical University Beijing China

3. The National Clinical Research Center for Mental Disorders and Beijing Key Laboratory of Mental Disorders Beijing China

4. Chinese Institute for Brain Research Beijing China

5. CAS Key Laboratory of Behavioral Science, Institute of Psychology, Chinese Academy of Sciences Beijing China

Abstract

AbstractObjectiveAlthough studies have demonstrated the involvement of the nucleus accumbens (NAc) in the neurobiology of eating disorders, its alterations in bulimia nervosa (BN) remain largely unknown. This study investigated the structural and functional properties of NAc in patients with BN.MethodBased on the resting‐state functional MRI and high‐resolution anatomical T1‐weighted imaging data acquired from 43 right‐handed BN patients and 40 sex‐, age‐ and education‐matched right‐handed healthy controls (HCs), the group differences in gray matter volume (GMV) and fractional amplitude of low‐frequency fluctuation (fALFF) in slow‐4 and ‐5 bands and functional connectivity (FC) of NAc subregions (core and shell) were compared. The relationships between MRI and clinical data were explored in the BN group.ResultsCompared with HCs, BN patients showed preserved GMV, decreased fALFF in slow‐5 band of the left NAc core and shell, decreased FC between left NAc core and right caudate, and increased FC between all NAc subregions and frontal regions, between all NAc subregions (except the right NAc core) and the supramarginal gyrus (SMG), and between right NAc shell and left middle temporal gyrus. FC between the NAc and SMG was correlated with emotional eating behaviors.DiscussionOur study revealed preserved GMV, local neuronal activity reduction and functional network reorganization of the NAc in BN. The functional network reorganization of the NAc mainly occurred in the frontal cortex and was correlated with emotional eating behavior. These findings may provide novel insights into the BN using NAc as an entry point.Public significanceAlthough studies have demonstrated the involvement of the nucleus accumbens (NAc) in the neurobiology of eating disorders, its alterations in bulimia nervosa (BN) remain largely unknown. We used a multimodal MRI technique to systematically investigate structural and functional alterations in NAc subregions of BN patients and explored the associations between such alterations and maladaptive eating behaviors, hoping to provide novel insights into BN.

Funder

Beijing Friendship Hospital, Capital Medical University

National Natural Science Foundation of China

Publisher

Wiley

Subject

Psychiatry and Mental health

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