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Psychiatry Res. 2014 Sep 30;223(3):253-60. doi: 10.1016/j.pscychresns.2014.05.016. Epub 2014 Jun 5.

Glutamate and GABA contributions to medial prefrontal cortical activity to emotion: implications for mood disorders.

Author information

1
University of Pittsburgh Medical Center, Western Psychiatric Institute and Clinic, Pittsburgh, PA, USA; Currently at UT Southwestern Medical Center at Dallas, TX, USA. Electronic address: ana.stan@utsouthwestern.edu.
2
University of Pittsburgh, Department of Radiology, Magnetic Resonance Research Center, USA.
3
Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, USA.
4
Centre for Music and Science, Faculty of Music, University of Cambridge, UK.
5
University of California Davis, Department of Psychiatry and Behavioral Sciences, USA.

Abstract

The dorsomedial prefrontal cortex (MdPFC) and anterior cingulate cortices (ACC) play a critical role in implicit emotion regulation; however the understanding of the specific neurotransmitters that mediate such role is lacking. In this study, we examined relationships between MdPFC concentrations of two neurotransmitters, glutamate and γ-amino butyric acid (GABA), and BOLD activity in ACC during performance of an implicit facial emotion-processing task. Twenty healthy volunteers, aged 20-35 years, were scanned while performing an implicit facial emotion-processing task, whereby presented facial expressions changed from neutral to one of the four emotions: happy, anger, fear, or sad. Glutamate concentrations were measured before and after the emotion-processing task in right MdPFC using magnetic resonance spectroscopy (MRS). GABA concentrations were measured in bilateral MdPFC after the emotion-processing task. Multiple regression models were run to determine the relative contribution of glutamate and GABA concentration, age, and gender to BOLD signal in ACC to each of the four emotions. Multiple regression analyses revealed a significant negative correlation between MdPFC GABA concentration and BOLD signal in subgenual ACC (p<0.05, corrected) to sad versus shape contrast. For the anger versus shape contrast, there was a significant negative correlation between age and BOLD signal in pregenual ACC (p<0.05, corrected) and a positive correlation between MdPFC glutamate concentration (pre-task) and BOLD signal in pregenual ACC (p<0.05, corrected). Our findings are the first to provide insight into relationships between MdPFC neurotransmitter concentrations and ACC BOLD signal, and could further understanding of molecular mechanisms underlying emotion processing in healthy and mood-disordered individuals.

KEYWORDS:

Anger; Anterior cingulate; Emotion processing; GABA; Glutamate; Sadness

[Indexed for MEDLINE]

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