Abstract
Integrin α3 is critical for proper neuron-glia cell adhesion and dendrite development, implicated in various neurodevelopmental disorders. In this study, mice deficient in integrin α3 (NEX-Itga3-/- mice) exhibit behavioral anomalies that mirror Attention Deficit Hyperactivity Disorder (ADHD), including increased mobility, impulsive disinhibition and impaired working memory. The mutant mice exhibit a reduced hippocampal volume and decreased α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor (AMPAR) surface distribution in the hippocampus. Utilizing two-pimaging combined with whole-cell recordings, diminished AMPAR function and increased prevalence of silent synapses were observed in the NEX-Itga3-/- mice. Systemic treatment with methylphenidate (MPH) and intra-hippocampal administration of the dopamine D1 receptor agonist SKF81297 improved ADHD-like behaviors, associated with enhanced dopamine D1 receptor activity and increased insertion of AMPARs in the hippocampus. Our analysis of the ABCD database uncovered a significant positive correlation between reduced integrin α3 expression and the prevalence of ADHD in adolescent humans. By identifying hippocampal AMPAR regulation as a key pathway through which ITGA3 influences ADHD-related phenotypes, this study uncovers a previously underappreciated hippocampal mechanism in ADHD and suggests new therapeutic strategies targeting synaptic modulation and hippocampal circuits.

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Data availability
All original data reported in this paper will be shared by the lead contact upon request. Any additional information required to reanalyze the data reported in this paper is available from the lead contact upon request.
Materials availability
This study did not generate new unique reagents. All mice, reagents and software used are listed in the key resource table.
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Acknowledgements
National Key R&D Program of China (2021ZD0202805, 2019YFA0709504). National Natural Science Foundation of China (32471083, 82530042). Innovative Research Team of High-level Local Universities in Shanghai, 111 Project (B18015). Shanghai Municipal Science and Technology Major Project (2018SHZDZX01).
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X.Y. conceived the project, designed experiments, performed investigations, contributed to methodology development, supervised research activities, and contributed to both the original draft and manuscript revision. R.C. contributed to methodology, performed investigations, and participated in manuscript editing. J.Z. contributed to methodology, performed investigations, co-wrote the original draft, and participated in manuscript revision. R.H. contributed to methodology and investigation. S.X. contributed to methodology and investigation. T.J. contributed to methodology and supervised aspects of the project. Y.G. contributed to methodology and investigation. Z.W. contributed to methodology and investigation. H.H. contributed to methodology and investigation. H.C. contributed to methodology. H.W. supervised aspects of the project. J.F. supervised the project and contributed to manuscript revision. T.W.R. supervised the project and contributed to manuscript revision. Y.W. acquired funding, supervised the project, and contributed to manuscript revision. M.J.H. supervised the project and contributed to manuscript revision. A.J.K. supervised the project and contributed to manuscript revision. X.X. conceived the project, contributed to conceptualization and methodology, acquired funding, supervised the study, and contributed to the original draft and manuscript revision.
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Animal experiments were performed in accordance with guidelines approved by the Animal Ethics Committee of the Department of Laboratory Animal Science, Fudan University (Approval Nos. 202103010S, 202412026S). Data used in the preparation of this article were obtained from the Adolescent Brain Cognitive Development SM (ABCD) Study (https://abcdstudy.org), held in the NIMH Data Archive (NDA). This is a multisite, longitudinal study designed to recruit more than 10,000 children age 9–10 and follow them over 10 years into early adulthood. The ABCD Study® is supported by the National Institutes of Health (NIH) and additional federal partners under award numbers U01DA041048, U01DA050989, U01DA051016, U01DA041022, U01DA051018, U01DA051037, U01DA050987, U01DA041174, U01DA041106, U01DA041117, U01DA041028, U01DA041134, U01DA050988, U01DA051039, U01DA041156, U01DA041025, U01DA041120, U01DA051038, U01DA041148, U01DA041093, U01DA041089, U24DA041123, U24DA041147. A full list of supporters is available at https://abcdstudy.org/federal-partners.html. A listing of participating sites and a complete listing of the study investigators can be found at https://abcdstudy.org/consortium_members/. ABCD consortium investigators designed and implemented the study and/or provided data but did not necessarily participate in the analysis or writing of this report. This manuscript reflects the views of the authors and may not reflect the opinions or views of the NIH or ABCD consortium investigators. The ABCD data repository grows and changes over time. The ABCD data used in this report came from NIMH Data Archive https://doi.org/10.15154/z563-zd24.
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Yao, X., Chen, R., Zhu, J. et al. Downregulation of integrin α3 in ADHD mirrored in mutant mouse model by dopamine-dependent hippocampal AMPAR expression. Mol Psychiatry (2025). https://doi.org/10.1038/s41380-025-03399-x
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DOI: https://doi.org/10.1038/s41380-025-03399-x


