期刊
BRAIN
卷 136, 期 -, 页码 918-925出版社
OXFORD UNIV PRESS
DOI: 10.1093/brain/aws368
关键词
neurofibromatosis type 1; GABA; neurodevelopmental disorders; visual cortex; spectroscopy
资金
- University of Coimbra [III/14/2008]
- Portuguese Foundation for Science and Technology [PIC/IC/83155/2007, PIC/IC/82986/2007, COMPETE PTDC/SAU-ORG/118380, SFRH/BD/41348/2007, SFRH/BPD/34392/2006, SFRH/BD/41401/2007]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/41348/2007, PIC/IC/83155/2007, SFRH/BD/41401/2007] Funding Source: FCT
Alterations in the balance between excitatory and inhibitory neurotransmission have been implicated in several neurodevelopmental disorders. Neurofibromatosis type 1 is one of the most common monogenic disorders causing cognitive deficits for which studies on a mouse model (Nfl(+/-)) proposed increased gamma-aminobutyric acid-mediated inhibitory neurotransmission as the neural mechanism underlying these deficits. To test whether a similar mechanism translates to the human disorder, we used magnetic resonance spectroscopy to measure gamma-aminobutyric acid levels in the visual cortex of children and adolescents with neurofibromatosis type 1 (n = 20) and matched control subjects (n = 26). We found that patients with neurofibromatosis type 1 have significantly lower gamma-aminobutyric acid levels than control subjects, and that neurofibromatosis type 1 mutation type significantly predicted cortical gamma-aminobutyric acid. Moreover, functional imaging of the visual cortex indicated that blood oxygen level-dependent signal was correlated with gamma-aminobutyric acid levels both in patients and control subjects. Our results provide in vivo evidence of gamma-aminobutyric acidergic dysfunction in neurofibromatosis type 1 by showing a reduction in gamma-aminobutyric acid levels in human patients. This finding is relevant to understand the physiological profile of the disorder and has implications for the identification of targets for therapeutic strategies.
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