Cited by 276Functional Brain Connectivity StudiesTreatment of Major DepressionNeural and Behavioral Psychology Studies

Glutamatergic and resting state functional connectivity correlates of severity in major depression - the role of pregenual anterior cingulate cortex and anterior insula

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Horn·2010·Frontiers in Systems Neuroscience

Abstract

Glutamatergic mechanisms and resting-state functional connectivity alterations have been recently described as factors contributing to major depressive disorder (MDD). Furthermore, the pregenual anterior cingulate cortex (pgACC) seems to play an important role for major depressive symptoms such as anhedonia and impaired emotion processing. We investigated 22 MDD patients and 22 healthy subjects using a combined magnetic resonance spectroscopy (MRS) and resting-state functional magnetic resonance imaging (fMRI) approach. Severity of depression was rated using the 21-item Hamilton depression scale (HAMD) and patients were divided into severely and mildly depressed subgroups according to HAMD scores. Because of their hypothesized role in depression we investigated the functional connectivity between pgACC and left anterior insular cortex (AI). The sum of Glutamate and Glutamine (Glx) in the pgACC, but not in left AI, predicted the resting-state functional connectivity between the two regions exclusively in depressed patients. Furthermore, functional connectivity between these regions was significantly altered in the subgroup of severely depressed patients (HAMD > 15) compared to healthy subjects and mildly depressed patients. Similarly the Glx ratios, relative to Creatine, in the pgACC were lowest in severely depressed patients. These findings support the involvement of glutamatergic mechanisms in severe MDD which are related to the functional connectivity between pgACC and AI and depression severity.

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  1. Ad-Dab'bagh Y. Lyttelton O. Muehlboeck J. S. Lepage C. Einarson D. Mok K. Ivanov O. Vincent R. D. Lerch J. Fombonne E. Evans A. C. (2006). “The CIVET image-processing environment: a fully automated comprehensive pipeline for anatomical neuroimaging research,” in Proceedings of the 12th Annual Meeting of the Organization for Human Brain Mapping, ed. Corbetta M. (Elsevier, Florence).
  2. Rajkowska G. Miguel-Hidalgo J. J. Wei J. Dilley G. Pittman S. D. Meltzer H. Y. Overholser J. C. Roth B. L. Stockmeier C. A. (1999). Morphometric evidence for neuronal and glial prefrontal cell pathology in major depression. Biol. Psychiatry 45, 1085– 1098 10.1016/S0006-3223(99)00041-4 10331101 · DOI · Paper page

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Authors
Horn
Venue
Frontiers in Systems Neuroscience
Published
2010
Volume
4
ISSN
1662-5137 (ISSN-L)
OpenAlex
W1969495575
Cited by
276
References
71
Citations by year
2026: 1 · 2025: 9 · 2024: 7 · 2023: 6 · 2022: 14 · 2021: 32 · 2020: 18 · 2019: 15 · 2018: 24 · 2017: 19 · 2016: 21 · 2015: 25 · 2014: 27 · 2013: 25 · 2012: 13
FWCI
10.86
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Frontiers in Systems Neuroscience (publishedVersion, other-oa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
major depressive disorder, depression severity, pregenual anterior cingulate cortex, anterior insula, resting-state functional connectivity, glutamatergic mechanisms, glutamate/glutamine, creatine, magnetic resonance spectroscopy, anhedonia, emotional processing

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