Microstructural abnormalities in subcortical reward circuitry of subjects with major depressive disorder

Anne J. Blood, Dan V. Iosifescu, Nikos Makris, Roy H. Perlis, David N. Kennedy, Darin D. Dougherty, Byoung Woo Kim, Myung Joo Lee, Shirley Wu, Sang Lee, Jesse Calhoun, Steven M. Hodge, Maurizio Fava, Bruce R. Rosen, Jordan W. Smoller, Gregory P. Gasic, Hans C. Breiter

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

Background: Previous studies of major depressive disorder (MDD) have focused on abnormalities in the prefrontal cortex and medial temporal regions. There has been little investigation in MDD of midbrain and subcortical regions central to reward/aversion function, such as the ventral tegmental area/substantia nigra (VTA/SN), and medial forebrain bundle (MFB). Methodology/Principal Findings: We investigated the microstructural integrity of this circuitry using diffusion tensor imaging (DTI) in 22 MDD subjects and compared them with 22 matched healthy control subjects. Fractional anisotropy (FA) values were increased in the right VT and reduced in dorsolateral prefrontal white matter in MDD subjects. Follow-up analysis suggested two distinct subgroups of MDD patients, which exhibited non-overlapping abnormalities in reward/aversion circuitry. The MDD subgroup with abnormal FA values in VT exhibited significantly greater trait anxiety than the subgroup with normal FA values in VT, but the subgroups did not differ in levels of anhedonia, sadness, or overall depression severity. Conclusions/Significance: These findings suggest that MDD may be associated with abnormal microstructure in brain reward/aversion regions, and that there may be at least two subtypes of microstructural abnormalities which each impact core symptoms of depression.

Original languageEnglish (US)
Article numbere13945
JournalPloS one
Volume5
Issue number11
DOIs
StatePublished - 2010

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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