Cited by 222Neuroendocrine regulation and behaviorAutism Spectrum Disorder ResearchGenetics and Neurodevelopmental Disorders

Clinical and neural effects of six-week administration of oxytocin on core symptoms of autism

Watanabe, Takamitsu, Kuroda, Miho, Kuwabara, Hitoshi, Aoki, Yuta, Iwashiro, Norichika, Tatsunobu, Natsubori, Takao, Hidemasa, Nippashi, Yasumasa +4 more·2015·Brain

Abstract

Autism spectrum disorder is a prevalent neurodevelopmental disorder with no established pharmacological treatment for its core symptoms. Although previous literature has shown that single-dose administration of oxytocin temporally mitigates autistic social behaviours in experimental settings, it remains in dispute whether such potentially beneficial responses in laboratories can result in clinically positive effects in daily life situations, which are measurable only in long-term observations of individuals with the developmental disorder undergoing continual oxytocin administration. Here, to address this issue, we performed an exploratory, randomized, double-blind, placebo-controlled, crossover trial including 20 high-functional adult males with autism spectrum disorder. Data obtained from 18 participants who completed the trial showed that 6-week intranasal administration of oxytocin significantly reduced autism core symptoms specific to social reciprocity, which was clinically evaluated by Autism Diagnostic Observation Scale (P = 0.034, PFDR < 0.05, Cohen's d = 0.78). Critically, the improvement of this clinical score was accompanied by oxytocin-induced enhancement of task-independent resting-state functional connectivity between anterior cingulate cortex and dorso-medial prefrontal cortex (rho = -0.60, P = 0.011), which was measured by functional magnetic resonance imaging. Moreover, using the same social-judgement task as used in our previous single-dose oxytocin trial, we confirmed that the current continual administration also significantly mitigated behavioural and neural responses during the task, both of which were originally impaired in autistic individuals (judgement tendency: P = 0.019, d = 0.62; eye-gaze effect: P = 0.03, d = 0.56; anterior cingulate activity: P = 0.00069, d = 0.97; dorso-medial prefrontal activity: P = 0.0014, d = 0.92; all, PFDR < 0.05). Furthermore, despite its longer administration, these effect sizes of the 6-week intervention were not larger than those seen in our previous single-dose intervention. These findings not only provide the evidence for clinically beneficial effects of continual oxytocin administration on the core social symptoms of autism spectrum disorder with suggesting its underlying biological mechanisms, but also highlight the necessity to seek optimal regimens of continual oxytocin treatment in future studies.

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  • Small randomized controlled trials of intranasal oxytocin administered for 4 to 24 weeks in persons with autism spectrum disorder have had equivocal results regarding improvements in social functioning, social cognition, or social attention.

    “Small, randomized, controlled trials of intranasal oxytocin administered for 4 to 24 weeks in persons with autism spectrum disorder have had equivocal results with regard to oxytocin-associated improvements in social functioning, social cognition, or social attention.18–21”
  • Oxytocin has received substantial interest as a potential treatment for psychiatric conditions such as autism, although clinical trials show modest effects.

    “Oxytocin has received substantial interest as a potential treatment for psychiatric conditions such as autism spectrum conditions (ASC; henceforth autism),3 although clinical trials show modest effects.4, 5, 6”
  • The small number of existing rsfMRI oxytocin-administration studies use seed-based analyses that do not allow for hypothesis-free examination across the connectome.

    “the small number of existing rsfMRI oxytocin-administration studies5, 13, 19, 20 use seed-based analyses that do not allow for hypothesis-free examination across the connectome.”
  • Six-weeks of IN-OT treatment in ASD patients rescued social reciprocity deficits and enhanced task-dependent functional connectivity between anterior cingulate cortex and PFC.

    “Six-weeks of IN-OT treatment in ASD patients rescued social reciprocity deficits and enhanced task-dependent functional connectivity between anterior cingulate cortex and PFC [48].”
  • The improvement was accompanied by increased resting state functional connectivity between ACC and dmPFC and increased eye gaze during a social-judgment task.

    “The improvement was accompanied by increased resting state functional connectivity between ACC and dmPFC in addition to an increased eye gaze during a social-judgment task.”

    From A precision medicine approach to oxytocin trials (2017) · cites this paper as Watanabe et al. 2015

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Authors
Watanabe, T., Kuroda, M., Kuwabara, H., Aoki, Y., Iwashiro, N., Tatsunobu, N., Takao, H., Nippashi, Y., Kawakubo, Y., Kunimatsu, A., Kasai, K., & Yamasue, H.
Affiliations
  • University College London (GB)
  • The University of Tokyo (JP)
  • Japan Science and Technology Agency (JP)
Venue
Brain
Published
2015-09-03
Volume
138
Issue
11
Pages
3400-3412
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2216419462
Cited by
222
References
60
Citations by year
2026: 10 · 2025: 11 · 2024: 10 · 2023: 21 · 2022: 19 · 2021: 22 · 2020: 22 · 2019: 19 · 2018: 29 · 2017: 29 · 2016: 22 · 2015: 8
FWCI
48.12
Type
journal article
Language
en
Open access
closed
Locations
  • Brain (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • Ministry of Education, Culture, Sports, Science and Technology
  • Japan Society for the Promotion of Science (26250024, 25461751)
  • Japan Science and Technology Agency
Topics
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
oxytocin, autism spectrum disorder, social reciprocity, resting-state functional connectivity, anterior cingulate cortex, dorsomedial prefrontal cortex, social judgment, gaze, high-functioning adults
MeSH terms
Autism Spectrum Disorder, Administration, Intranasal, Adult, Autistic Disorder, Brain, Double-Blind Method, Gyrus Cinguli, Humans, Magnetic Resonance Imaging, Male, Neural Pathways, Oxytocics, Oxytocin, Social Behavior, Treatment Outcome, Prefrontal Cortex, Cross-Over Studies, Young Adult, Functional Neuroimaging

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