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White matter microstructure in obesity and bipolar disorders: an ENIGMA bipolar disorder working group study in 2186 individuals

Abstract

Although specific risk factors for brain alterations in bipolar disorders (BD) are currently unknown, obesity impacts the brain and is highly prevalent in BD. Gray matter correlates of obesity in BD have been well documented, but we know much less about brain white matter abnormalities in people who have both obesity and BD. We obtained body mass index (BMI) and diffusion tensor imaging derived fractional anisotropy (FA) from 22 white matter tracts in 899 individuals with BD, and 1287 control individuals from 20 cohorts in the ENIGMA-BD working group. In a mega-analysis, we investigated the associations between BMI, diagnosis or medication and FA. Lower FA was associated with both BD and BMI in six white matter tracts, including the corpus callosum and thalamic radiation. Higher BMI or BD were uniquely associated with lower FA in three and six white matter tracts, respectively. People not receiving lithium treatment had a greater negative association between FA and BMI than people treated with lithium in the posterior thalamic radiation and sagittal stratum. In three tracts BMI accounted for 10.5 to 17% of the negative association between the number of medication classes other than lithium and FA. Both overweight/obesity and BD demonstrated lower FA in some of the same regions. People prescribed lithium had a weaker association between BMI and FA than people not on lithium. In contrast, greater weight contributed to the negative associations between medications and FA. Obesity may add to brain alterations in BD and may play a role in effects of medications on the brain.

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Fig. 1: Results of the mega-analysis of the association between BD and obesity with FA.
Fig. 2: Statistical effect of BMI on FA and BMI distribution.
Fig. 3: The effect of medication classes and BMI on fractional anisotropy.
Fig. 4: Interaction between BMI and prescription of lithium at the time of scanning in white matter tracts.

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Data availability

Data are available upon request, but are not made public due to ethics board approval.

Code availability

All analyses were conducted in R version 4.1.1. Code is available upon request.

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Acknowledgements

We gratefully acknowledge the following contributions and research funding sources that made this study possible: PT, CRKC, and NJ were supported by Baszucki Brain Research Fund and the Milken Institute’s Center for Strategic Philanthropy grant; R01 MH129742–01; Consortium grant (U54 EB020403) from the NIH Institutes contributing to the Big Data to Knowledge (BD2K) Initiative; The ENIGMA World Aging Center (R56 AG058854); The ENIGMA Sex Differences Initiative (R01 MH116147); The ENIGMA Bipolar Initiative (R01 MH129742-01). OA was supported by the NIMH Award 1R01MH129742 – 01, Research Council of Norway (#223273, #324252, #324499) EU’s H2020 RIA grant # 847776 CoMorMent. This work is also part of the German multicenter consortium “FOR 2107: Neurobiology of Affective Disorders. A translational perspective on brain structure and function”, funded by the German Research Foundation (Deutsche Forschungsgemeinschaft DFG; Forschungsgruppe/Research Unit FOR2107). Principal investigators (PIs) with respective areas of responsibility in the FOR2107 consortium are: For FOR2107-Marburg to TK (speaker FOR2107; DFG grant numbers KI588/14-1, and KI588/14-2, and KI588/20-1, KI588/22-1), AK (KR 3822/5-1, KR 3822/7-2), IN (NE2254/1-2, NE2254/2-1, NE2254/3-1, NE2254/4-1), and CK (KO 4291/3-1). Biosamples and corresponding data were sampled, processed, and stored in the Marburg Biobank CBBMR. Further support from the German sites were provided by MNC and FOR2107-Muenster: This work was funded by the German Research Foundation (SFB-TRR58, Project C09 to UD). Funding FOR2107-Muenster: This work was funded by the German Research Foundation (DFG), UD (co-speaker FOR2107, DA 1151/5-1, DA 1151/5-2, grant DA1151/9-1, DA1151/10-1 and DA1151/11-1) and the Interdisciplinary Center for Clinical Research (IZKF) of the medical faculty of Münster (grant Dan3/022/22 to UD). The San Raffaele site was supported by the European Union H2020 EU.3.1.1 grant 754740 MOODSTRATIFICATION. The St. Göran study was supported by grants from the Swedish Research Council (2022-01643), the Swedish foundation for Strategic Research (KF10-0039), the Swedish Brain foundation (FO2022-0217), and the Swedish Federal Government under the LUA/ALF agreement (ALF 20200036, ALFGBG-965444). The UNSW cohort was supported by Australian NHMRC Investigator Grant (1177991); Australian NHMRC Partnership Project Grant (1195643); Australian NHMRC Center of Research Excellence (2015747); Lansdowne Foundation; Good Talk charity. The Singapore study was supported by research grant from the Singapore Bioimaging Consortium (RP C009/06) research grant awarded to K.S. COGSBD cohort - TVR was supported by an NHMRC Early Career Fellowship 1088785, a Dame Kate Campbell Fellowship, and an Al and Val Rosenstrauss Fellowship from the Rebecca L Cooper Medical Research Foundation. SR was supported by an NHMRC Senior Research Fellowship 1154651. MB is supported by a NHMRC Senior Principal Research Fellowship and Leadership 3 Investigator grant (1156072 and 2017131). JK was supported by an Australian Postgraduate Award. LF was supported by the Australian Rotary Health/Brunslea Park Estate/ Ian Parker Bipolar Research Fund. The authors would also like to acknowledge project specific financial support of the Henry Freeman Trust, Jack Brockhoff Foundation, University of Melbourne, Barbara Dicker Brain Sciences Foundation, Rebecca L Cooper Foundation and the Society of Mental Health Research. The authors acknowledge the facilities and scientific and technical assistance of the National Imaging Facility, a National Collaborative Research Infrastructure Strategy (NCRIS) capability, at the Swinburne Neuroimaging (SNI) Facility, Swinburne University of Technology. Finally, the authors would like to thank the participants in this study for their time and contribution. The Medellin studies (GIPSI) were supported by the PRISMA UNION TEMPORAL (UNIVERSIDAD DE ANTIOQUIA / HOSPITAL SAN VICENTE FUNDACIÓN), Colciencias-INVITACIÓN 990 de 3 de agosto de 2017, Codigo 99059634. The University of Galway research was supported by the Irish Research Council (IRC) Postgraduate Scholarship, Ireland awarded to LN and to GM, and by the Health Research Board (HRA-POR-324) awarded to DMC and (HRA_POR/2011/100) awarded to CMcD. We thank the participants and the support of the Welcome-Trust HRB Clinical Research Facility and the Center for Advanced Medical Imaging, St. James Hospital, Dublin, Ireland. The University of Toronto CYBD study was funded by the Canadian Institutes of Health Research (Grant number: MOP 136947) and Sunnybrook Health Sciences Center Brenda Smith Fund. BG also acknowledges the CAMH Discovery Fund and his position as RBC Investments Chair in Children’s Mental Health and Developmental Psychopathology at CAMH, a joint Hospital-University Chair between the University of Toronto, CAMH, and the CAMH Foundation. The funding sources were not involved in study design and the conduct of the research. The Geneva sample was supported by the Swiss National Science Foundation: grant number 32003B-156914. The authors would like to thank the University of Geneva’s Brain and Behavior Laboratory (BBL) for their help in acquiring the data. The IDIBAPS(Clinic) and Barcelona (FIGMAG/Clinic) studies MRI acquisition was supported by the Spanish Ministry of Science and Innovation. Instituto de Salud Carlos III (PI15/00283, PI19/00394 and PI22/00261), integrated into the Plan Nacional de I + D + I and co-financed by ERDF Funds from the European Commission (“A Way of Making Europe”), CIBERSAM, and the CERCA Program / Generalitat de Catalunya and Secretaria d’Universitats i Recerca del Departament d’Economia I Coneixement and Departament de Salut (SLT002/16/00331, SLT006/17/00357, 2017SGR1365, 2021 SGR 01128). CIAM group (FMH - PI) was supported by the University Research Committee, University of Cape Town and South African funding bodies National Research Foundation and Medical Research Council. The Groningen study was funded by EU-FP7-HEALTH-222963 ‘MOODIN- FLAME’ and EU-FP7-PEOPLE-286334 ‘PSYCHAID’. TE was supported by the South-Eastern Norway Regional Health Authority (#2015-078, #2022043). This work was partially supported by NIMH (1R01MH085667-01A1), John S. Dunn Foundation (Houston, Texas), and Pat Rutherford Chair in Psychiatry (UTHealth Houston). Grenoble MRI facility IRMaGe is partly funded by the French program Investissement d’avenir run by the Agence Nationale de la Recherche: grant Infrastructure d’avenir en Biologie Santé ANR-11-INBS-0006. AM & HW acknowledge the University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. Is e buidheann carthannais a th’ ann an Oilthigh Dhùn Èideann, clàraichte an Alba, àireamh clàraidh SC005336. The Health Foundation & IMAGEMEND, which received funding from the European Community’s Seventh Framework Program (FP7/2007-2013) [grant number 602450]. MP acknowledges grant funding relevant to the study: R37MH1000401, The Pittsburgh Foundation, The Baszucki Brain Research Fund. The Paris site was funded by the French Agence Nationale Pour la Recherche (Labex BioPsy and ANR-DFG FUNDO projects) and by Fondation pour la Recherche Biomédicale (Bioinformatique pour la biologie). Lastly, this study was supported by the Canadian Institutes of Health Research (grants #142255, 180449, 186254), Nova Scotia Health Research Foundation, Dalhousie Clinical Research Scholarship to TH, Brain & Behavior Research Foundation (formerly NARSAD); 2007 Young Investigator and 2015 Independent Investigator Awards to TH.

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The following authors contributed substantially to the conception, design, analyses and interpretation of the data (LMFD, TH, SRM, PMT, PF, JH). All authors contributed to data collection/processing, revised the paper critically for important intellectual content and gave final approval of the version to be published.

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Correspondence to Tomas Hajek.

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PMT, CRKC and NJ received past research support from Biogen Inc. for work unrelated to this manuscript. TE is a consultant to Sumitomo Pharma and Cumulus and received speaker’s honoraria from Lundbeck and Janssen Cilag. Texas cohort (JS) has received speaking/consulting and/or research grants from: ALKERMES (Advisory Board), BOEHRINGER Ingelheim (Consultant), COMPASS Pathways (Research Grant), JOHNSON & JOHNSON (Consultant), LIVANOVA (Consultant), RELMADA (Research Grant), SUNOVION (Research Grant), Mind Med (Research Grant).

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Dietze, L.M.F., McWhinney, S.R., Favre, P. et al. White matter microstructure in obesity and bipolar disorders: an ENIGMA bipolar disorder working group study in 2186 individuals. Mol Psychiatry 30, 1770–1779 (2025). https://doi.org/10.1038/s41380-024-02784-2

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