BACKGROUND: Several lines of emerging evidence suggest that dysfunction of gamma-aminobutyric acid (GABA) systems is associated with major depression. However, investigation of this hypothesis is limited by difficulty obtaining noninvasive in vivo measures of brain GABA levels. In this study we used in vivo proton magnetic resonance spectroscopy to investigate the hypothesis that abnormalities in the GABA neurotransmitter system are associated with the neurobiologic processes of depression. METHODS: The GABA levels were measured in the occipital cortex of medication-free depressed patients meeting DSM-IV criteria (n = 14) and healthy control subjects with no history of mental illness (n = 18) using a localized difference editing proton magnetic resonance spectroscopy protocol. An analysis of covariance was employed to examine the effects of depression, sex, and age. RESULTS: The depressed patients demonstrated a highly significant (52%) reduction in occipital cortex GABA levels compared with the group of healthy subjects. While there were significant age and sex effects, there was no interaction of diagnosis with either age or sex. CONCLUSION: This study provides the first evidence of abnormally low cortical GABA concentrations in the brains of depressed patients.
BACKGROUND: Several lines of emerging evidence suggest that dysfunction of gamma-aminobutyric acid (GABA) systems is associated with major depression. However, investigation of this hypothesis is limited by difficulty obtaining noninvasive in vivo measures of brain GABA levels. In this study we used in vivo proton magnetic resonance spectroscopy to investigate the hypothesis that abnormalities in the GABA neurotransmitter system are associated with the neurobiologic processes of depression. METHODS: The GABA levels were measured in the occipital cortex of medication-free depressedpatients meeting DSM-IV criteria (n = 14) and healthy control subjects with no history of mental illness (n = 18) using a localized difference editing proton magnetic resonance spectroscopy protocol. An analysis of covariance was employed to examine the effects of depression, sex, and age. RESULTS: The depressedpatients demonstrated a highly significant (52%) reduction in occipital cortex GABA levels compared with the group of healthy subjects. While there were significant age and sex effects, there was no interaction of diagnosis with either age or sex. CONCLUSION: This study provides the first evidence of abnormally low cortical GABA concentrations in the brains of depressedpatients.
Authors: Melanie P Leussis; Nadja Freund; Heather C Brenhouse; Britta S Thompson; Susan L Andersen Journal: Dev Neurosci Date: 2012-07-06 Impact factor: 2.984
Authors: Rungnapa Hirunsatit; Elizabeth D George; Barbara K Lipska; Hani M Elwafi; Lisa Sander; Carolyn M Yrigollen; Joel Gelernter; Elena L Grigorenko; Jaakko Lappalainen; Shrikant Mane; Angus C Nairn; Joel E Kleinman; Arthur A Simen Journal: Pharmacogenet Genomics Date: 2009-01 Impact factor: 2.089
Authors: Chris C Streeter; John Hennen; Yong Ke; J Eric Jensen; Ofra Sarid-Segal; Leanne E Nassar; Clifford Knapp; Angela A Meyer; Tae Kwak; Perry F Renshaw; Domenic A Ciraulo Journal: Psychopharmacology (Berl) Date: 2005-10-19 Impact factor: 4.530