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Superoxide dismutase isozymes in cerebral organoids from autism spectrum disorder patients

  • Psychiatry and Preclinical Psychiatric Studies - Original Article
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Abstract

Autism spectrum disorder is a pervasive neurodevelopmental disorder with a substantial contribution to the global disease burden. Despite intensive research efforts, the aetiopathogenesis remains unclear. The Janus-faced antioxidant enzymes superoxide dismutase 1–3 have been implicated in initiating oxidative stress and as such may constitute a potential therapeutic target. However, no measurement has been taken in human autistic brain samples. The aim of this study is to measure superoxide dismutase 1–3 in autistic cerebral organoids as an in vitro model of human foetal neurodevelopment. Whole brain organoids were created from induced pluripotent stem cells from healthy individuals (n = 5) and individuals suffering from autism (n = 4). Using Pierce bicinchoninic acid and enzyme-linked immunosorbent assays, the protein and superoxide dismutase 1, 2, and 3 concentrations were quantified in the cerebral organoids at days 22, 32, and 42. Measurements were normalized to the protein concentration. Results represented using medians and interquartile ranges. Using Wilcoxon matched-pairs signed-rank test, an abrupt rise in the superoxide dismutase concentration was observed at day 32 and onwards. Using Wilcoxon rank-sum test, no differences were observed between healthy (SOD1: 35.56 ng/mL ± 3.46; SOD2: 2435.80 ng/mL ± 1327.00; SOD3: 1854.88 ng/mL ± 867.94) and autistic (SOD1: 32.85 ng/mL ± 5.26; SOD2: 2717.80 ng/mL ± 1889.10; SOD3: 1690.18 ng/mL ± 615.49) organoids. Cerebral organoids recapitulate many aspects of human neurodevelopment, but the diffusion restriction may render efforts in modelling differences in oxidative stress futile due to the intrinsic hypoxia and central necrosis.

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Upon reasonable request, the raw data can be accessed by contacting the corresponding author.

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Funding

The research group is funded by the Research Foundation for Psychiatric Research in the Region of Southern Denmark and covers the running cost of daily activities and salaries. The funding source had no influence on the research.

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Contributions

ME: investigation, formal analysis, visualization, and writing (original draft). MI: conceptualization, methodology, supervision, and writing (review and editing). TMM: conceptualization, methodology, resources, supervision, project administration, funding acquisition, and writing (review and editing).

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Correspondence to Tanja Maria Michel.

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Conflict of interest

The authors have no relevant financial, non-financial, or competing interests to disclose in any material discussed in this article.

Ethics

This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by The Research Ethics Committee of the Region of Southern Denmark, DK (S-20160103).

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Informed consent was obtained from all cell line donors.

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Ejlersen, M., Ilieva, M. & Michel, T.M. Superoxide dismutase isozymes in cerebral organoids from autism spectrum disorder patients. J Neural Transm 129, 617–626 (2022). https://doi.org/10.1007/s00702-022-02472-x

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  • DOI: https://doi.org/10.1007/s00702-022-02472-x

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