GABAB receptor modulation of visual sensory processing in adults with and without autism spectrum disorder
Inhibition and visual processing in ASD
Alterations in γ-aminobutyric acid (GABA)–related pathways have been shown to occur in patients with autism spectrum disorder (ASD). However, the role of GABA signaling modulation on sensory processing remains unclear. Now, Huang et al. show that visual processing, altered in patients with ASD, could be restored, promoting GABAB receptor activation using arbaclofen. The results suggest that GABA signaling alterations in ASD play a critical role in determining visual sensory responses and suggest that interventions promoting GABAergic activity might ameliorate sensory impairments in ASD.
Abstract
Sensory atypicalities in autism spectrum disorder (ASD) are thought to arise at least partly from differences in γ-aminobutyric acid (GABA) receptor function. However, the evidence to date has been indirect, arising from correlational studies in patients and preclinical models. Here, we evaluated the role of GABA receptor directly, in 44 adults (n = 19 ASD). Baseline concentration of occipital lobe GABA+ (GABA plus coedited macromolecules) was measured using proton magnetic resonance spectroscopy (1H-MRS). Steady-state visual evoked potential (SSVEP) elicited by a passive visual surround suppression paradigm was compared after double-blind randomized oral administration of placebo or 15 to 30 mg of arbaclofen (STX209), a GABA type B (GABAB) receptor agonist. In the placebo condition, the neurotypical SSVEP response was affected by both the foreground stimuli contrast and background interference (suppression). In ASD, however, all stimuli conditions had equal salience and background suppression of the foreground response was weaker. In the placebo condition, although there was no difference in GABA+ between groups, GABA+ concentration positively correlated with response to maximum foreground contrast during maximum background interference in neurotypicals, but not ASD. In neurotypicals, sensitivity to visual stimuli was disrupted by 30 mg of arbaclofen, whereas in ASD, it was made more “typical” and visual processing differences were abolished. Hence, differences in GABAergic function are fundamental to autistic (visual) sensory neurobiology and are modulated by GABAB activity.
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Science Translational Medicine
Volume 14 | Issue 626
January 2022
January 2022
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Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
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Received: 27 January 2021
Accepted: 5 November 2021
Acknowledgments
We thank P. Graces from Roche and J. Castelhano from University of Coimbra, and J. Horder for help with the EEG task design piloting. We also thank J. Kangas, C. Carey, and B. Kowalewska for help with study logistics, as well as all the participants.
Funding: This project was funded by an Independent Investigator Award to G.M.M. from the Brain and Behaviour Research Foundation and by funding from Clinical Research Associates L.L.C. (CRA), an affiliate of the Simons Foundation (to G.M.M and D.G.M.M.). Support is also acknowledged from Autistica (to A.C.P.) and the Sackler Institute for Translational Neurodevelopment at King’s College London (to A.C.P., H.V., C.L.E., A.L., E.D., D.G.M.M., and G.M.M.) and EU-AIMS (European Autism Interventions)/EU AIMS-2-TRIALS, an Innovative Medicines Initiative Joint Undertaking under grant agreement no. 777394 (to E.D., D.G.M.M., and G.M.M.). In addition, this paper represents independent research part funded by the National Institute for Health Research (NIHR) Mental Health Biomedical Research Centre (BRC) at South London and Maudsley NHS Foundation Trust and King’s College London (supporting D.G.M.M., G.M.M., C.M.P., N.M.L.W., Q.H., and H.V.). The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR, or the Department of Health and Social Care.
Author contributions: G.M.M. conceived the study and wrote the funding applications with D.G.M.M. G.M.M. obtained U.K. National Research Ethics Committee approvals. Q.H., A.C.P., H.V., J.A., G.M.M., E.D., and D.G.M.M. jointly designed the protocols for data collection. A.C.P., H.V., N.M.L.W., C.L.E, F.M.P., L.K., M.D., A.L., and C.M.P collected 1H-MRS scans and EEG data. G.I. oversaw pharmacy setup and dispensing and safety checks. D.J.L., D.R., and R.A.E.E. were responsible for physics and software for the HERMES protocol to quantify GABA+. Q.H. led the EEG analyses supported by C.L.E. and J.A. A.C.P. led the MRS analyses supported by A.L., F.M.P., and M.D. Coordinated recruitment, data acquisition, quality checking, and clinical screening and monitoring were provided by H.V., L.K., and A.L., supervised by G.M.M. and D.G.M.M. Q.H. and A.C.P. performed statistical analysis, supervised by G.M.M., E.D., and D.G.M.M. Q.H., A.C.P., D.G.M.M., and G.M.M. drafted the manuscript. All authors contributed to regular reviews of study progress, discussion, and interpretation of results and edited and approved the final draft.
Competing interests: The authors declare that they have no competing interests. Unrelated to this study, G.M.M. receives research funding from Compass Pathways Ltd. and has consulted for Greenwich (G.W.) Pharmaceuticals. D.G.M.M. is a consultant for F. Hoffmann-La Roche AG.
Data and materials availability: All the data associated with this study are present in the paper or the Supplementary Materials.
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EU-AIMS (European Autism Interventions)/EU AIMS-2-TRIALS:
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