A neural circuitry linking insulin resistance to depressed mood

Ryan, John P, Sheu, Lei K, Critchley, Hugo D and Gianaros, Peter J (2012) A neural circuitry linking insulin resistance to depressed mood. Psychosomatic Medicine, 74 (5). pp. 476-82. ISSN 0033-3174

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Abstract

OBJECTIVE

Insulin resistance (IR) confers risk for Type 2 diabetes and is associated with depressed mood. Neurons within the ventral striatum (VS) are sensitive to insulin levels and show altered function in the context of both IR and depression. Hence, VS may represent a critical component of a neural circuitry linking IR to depressed mood.

METHODS

Ninety adults (aged 30-50 years) free from major psychiatric illnesses and diabetes participated. Fasting blood was sampled, and participants completed a set of questionnaires (including the Beck Depression Inventory-II). Participants also underwent resting-state functional magnetic resonance imaging of the brain. Seed-based connectivity analyses, centered on VS, were conducted to examine how resting-state interregional connectivity patterns covaried with IR and depressed mood.

RESULTS

Higher levels of IR covaried with increased connective strength between the left VS and two regions: the insula and the anterior midcingulate cortex (aMCC). Moreover, aMCC-VS connectivity predicted depressed mood (b = 0.93, standard error = 0.36, F(change)(1,81) = 6.54, p = .01). Finally, aMCC-VS connectivity was shown by Monte Carlo analysis to mediate the relationship between IR and depressed mood (a*b indirect effect = 0.16, confidence interval = 0.005-0.39, p = .03).

CONCLUSIONS

IR relates to changes in the functional connectivity between VS and aMCC. These changes in interregional communication partly account for the coupling of IR to depressed mood in otherwise healthy adults. These findings are relevant for understanding bidirectional associations between diabetes risk and depressed mood.

Item Type: Article
Keywords: Author Keywords: anterior cingulate cortex; depressed mood; insulin resistance; ventral striatum; insula; fMRI KeyWords Plus: PATIENT HEALTH QUESTIONNAIRE; FUNCTIONAL CONNECTIVITY; ALZHEIMERS-DISEASE; METABOLIC SYNDROME; BRAIN ACTIVITY; HUMAN STRIATUM; YOUNG-ADULTS; VALIDITY; REWARD; MRI
Schools and Departments: Brighton and Sussex Medical School > Clinical and Experimental Medicine
Brighton and Sussex Medical School > Neuroscience
Subjects: R Medicine > R Medicine (General) > R895 Medical physics. Medical radiology. Nuclear medicine
R Medicine > RC Internal medicine > RC0321 Neurosciences. Biological psychiatry. Neuropsychiatry
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Depositing User: Hazelle Woodhurst
Date Deposited: 09 Apr 2013 14:02
Last Modified: 26 Sep 2017 10:54
URI: http://sro.sussex.ac.uk/id/eprint/44082
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