Citation

Marchand WR, Lee JN, Garn C, Thatcher J, Gale P, Kreitschitz S, Johnson S, Wood N. J. Affect. Disord. 2011; 133(3): 638-645.

Affiliation

George E. Wahlen Veterans Affairs Medical Center, United States; University of Utah, United States; The Brain Institute at the University of Utah, United States.

Copyright

(Copyright © 2011, Elsevier Publishing)

DOI

10.1016/j.jad.2011.04.039

PMID

21621263

Abstract

BACKGROUND: Considerable evidence implicates dysfunction of striatal and cortical midline structure (CMS) circuitry in mood disorders. Whether such aberrations exist in bipolar II depression is unknown. METHODS: Sixteen unmedicated subjects with bipolar II depression and 19 healthy controls were studied using functional MRI and a motor activation paradigm. Analyses of both activation and functional connectivity were conducted. RESULTS: A history of suicidal ideation (SI) was negatively correlated with activation of the left putamen while depression severity was positively correlated with activation of the left thalamus. The superior bilateral putamen was simultaneously correlated with depression severity and anti-correlated with SI. Striatal functional connectivity was altered with the bilateral CMS and right inferior parietal lobule. Depression severity was correlated with strength of connectivity between the bilateral striatum and the right lingual gyrus and left cerebellum. LIMITATIONS: Only males experiencing an episode of major depression were studied. CONCLUSIONS: Striatal and CMS circuit abnormalities likely contribute to the neurobiology of bipolar II depression. Altered connectivity of the striatum may directly impact depression severity. Further, dissociable components of activation associated with depression severity and suicidal ideation may exist. Finally, the motor activation paradigm used in this study appears to be a useful probe of some neural processes underlying bipolar II depression.

Language: en