Biochemical abnormalities of the medial temporal lobe and medial prefrontal cortex in late-life depression.

Published

Journal Article

We utilized single-voxel (1)H magnetic resonance spectroscopy (MRS) to investigate biochemical abnormalities related to late-life depression in the medial prefrontal cortex and medial temporal lobe. Fourteen elderly subjects whose depression responded to treatment and 12 nondepressed subjects were enrolled. Subjects were scanned using a GE 3.0 Tesla whole body MR scanner. Metabolite concentrations were quantified using the LC Model software and adjusted for CSF and ratio of gray to white matter. ANCOVA models tested for group differences while controlling for age and sex. Older previously depressed individuals showed significantly reduced concentrations of total N-acetyl aspartate (NAA), choline, and creatine in the prefrontal cortex and significantly elevated left medial temporal lobe concentrations of NAA and myo-inositol. There were no significant group differences in right temporal metabolite concentrations. The prefrontal cortex observations suggest that reduced neuronal, phospolipid, and energy metabolism is present even in clinically improved depression. In contrast, elevated NAA and myo-inositol concentrations in the left medial temporal lobe could be associated with neuronal and glial cell changes in the amygdala.

Full Text

Duke Authors

Cited Authors

  • Venkatraman, TN; Krishnan, RR; Steffens, DC; Song, AW; Taylor, WD

Published Date

  • April 30, 2009

Published In

Volume / Issue

  • 172 / 1

Start / End Page

  • 49 - 54

PubMed ID

  • 19179054

Pubmed Central ID

  • 19179054

International Standard Serial Number (ISSN)

  • 0165-1781

Digital Object Identifier (DOI)

  • 10.1016/j.pscychresns.2008.07.001

Language

  • eng

Conference Location

  • Ireland