Cortical GABA in Subjects at Ultra-High Risk of Psychosis: Relationship to Negative Prodromal Symptoms

G Modinos, F Şimşek, J Horder, M Bossong, I Bonoldi, M Azis, J Perez, M Broome, DJ Lythgoe, JM Stone, OD Howes, DG Murphy, AA Grace, P Allen, P McGuire

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)
189 Downloads (Pure)

Abstract

Background
Whilst robust preclinical and postmortem evidence suggests that altered GABAergic function is central to the development of psychosis, little is known about whether it is altered in subjects at ultra-high risk of psychosis, or its relationship to prodromal symptoms.
Methods
Twenty-one antipsychotic naïve ultra-high risk individuals and 20 healthy volunteers underwent proton magnetic resonance imaging at 3T. Gamma-aminobutyric acid levels were obtained from the medial prefrontal cortex using MEGA-PRESS and expressed as peak-area ratios relative to the synchronously acquired creatine signal. Gamma-aminobutyric acid levels were then related to severity of positive and negative symptoms as measured with the Community Assessment of At-Risk Mental States.
Results
Whilst we found no significant difference in gamma-aminobutyric acid levels between ultra-high risk subjects and healthy controls (P=.130), in ultra-high risk individuals, medial prefrontal cortex GABA levels were negatively correlated with the severity of negative symptoms (P=.013).
Conclusion
These findings suggest that gamma-aminobutyric acidergic neurotransmission may be involved in the neurobiology of negative symptoms in the ultra-high risk state.
Original languageEnglish
Pages (from-to)114-119
JournalInternational Journal of Neuropsychopharmacology
Volume21
Issue number2
Early online date19 Aug 2017
DOIs
Publication statusPublished - Feb 2018

Keywords

  • ultra-high risk of psychosis
  • negative symptoms
  • psychosis
  • magnetic resonance spectroscopy
  • GABA

Fingerprint

Dive into the research topics of 'Cortical GABA in Subjects at Ultra-High Risk of Psychosis: Relationship to Negative Prodromal Symptoms'. Together they form a unique fingerprint.

Cite this