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Laaksonen J, Ponkilainen V, Kuitunen I, Möttönen J, Mattila VM. Pediatric traumatic brain injury and early age multiple sclerosis in Finland: A nationwide register-based cohort study. Brain Behav 2024; 14:e3478. [PMID: 38622897 PMCID: PMC11019240 DOI: 10.1002/brb3.3478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/13/2024] [Accepted: 03/09/2024] [Indexed: 04/17/2024] Open
Abstract
OBJECTIVE Examine the link between pediatric traumatic brain injury (pTBI) and early-onset multiple sclerosis in Finland. METHODS Conducted nationwide register study (1998-2018) with 28,750 pTBI patients (< 18) and 38,399 pediatric references with extremity fractures. Multiple sclerosis diagnoses from Finnish Social Insurance Institution. Employed Kaplan-Meier and multivariable Cox regression for probability assessment, results presented with 95% CI. RESULTS Of 66 post-traumatic multiple sclerosis cases, 30 (0.10%) had pTBI, and 36 (0.09%) were in the reference group. Cumulative incidence rates (CIR) in the first 10 years were 46.5 per 100,000 (pTBI) and 33.1 per 100,000 (reference). Hazard ratio (HR) for pTBI was 1.10 (95% CI: 0.56-1.48).Stratified by gender, women's CIR was 197.9 per 100,000 (pTBI) and 167.0 per 100,000 (reference) after 15 years. For men, CIR was 44.6 per 100,000 (pTBI) and 34.7 per 100,000 (reference). In the initial 3 years, HR for female pTBI was 1.75 (95% CI: 0.05-6.32), and between years 3 and 20, it was 1.08 (95% CI: 0.51-1.67). For male patients, HR was 1.74 (95% CI: 0.69-4.39). SIGNIFICANCE We did not find evidence of an association between pTBI and early-onset multiple sclerosis 20 years post-initial trauma.
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Affiliation(s)
| | - Ville Ponkilainen
- Department of SurgeryHospital Nova of Central FinlandJyväskyläFinland
| | - Ilari Kuitunen
- Institute of Clinical Medicine and Department of PediatricsUniversity of Eastern FinlandKuopioFinland
- Department of PediatricsKuopio University HospitalKuopioFinland
| | - Julius Möttönen
- Institute of Clinical Medicine and Department of PediatricsUniversity of Eastern FinlandKuopioFinland
| | - Ville M. Mattila
- School of MedicineUniversity of TampereTampereFinland
- Department of Orthopedics and TraumatologyTampere University HospitalTampereFinland
- Coxa Hospital for Joint ReplacementTampereFinland
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Mustonen A, Rodriguez A, Scott JG, Vuori M, Hurtig T, Halt A, Miettunen J, Alakokkare A, Niemelä S. Attention deficit hyperactivity and oppositional defiant disorder symptoms in adolescence and risk of substance use disorders-A general population-based birth cohort study. Acta Psychiatr Scand 2023; 148:277-287. [PMID: 37431766 PMCID: PMC10953420 DOI: 10.1111/acps.13588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 05/29/2023] [Accepted: 06/12/2023] [Indexed: 07/12/2023]
Abstract
BACKGROUND Externalizing symptoms are associated with risk of future substance use disorder (SUD). Few longitudinal studies exist using general population-based samples which assess the spectrum of attention deficit hyperactivity disorder (ADHD) and oppositional defiant disorder (ODD) symptoms. AIMS/OBJECTIVES We aimed to study the associations between adolescent ADHD symptoms and subsequent SUD and additionally examine whether the risk of SUD is influenced by comorbid oppositional defiant disorder (ODD) symptoms. METHODS The Northern Finland Birth Cohort 1986 was linked to nationwide health care register data for incident SUD diagnoses until age 33 years (n = 6278, 49.5% male). ADHD/ODD-case status at age 16 years was defined using parent-rated ADHD indicated by Strengths and Weaknesses of ADHD symptoms and Normal Behaviors (SWAN) questionnaire with 95% percentile cut-off. To assess the impact of ODD comorbidity on SUD risk, participants were categorized into four groups based on their ADHD/ODD case status. Cox-regression analysis with hazard ratios (HRs) and 95% confidence intervals (CIs) were used to study associations between adolescent ADHD/ODD case statuses and subsequent SUD. RESULTS In all, 552 participants (8.8%) presented with ADHD case status at the age of 16 years, and 154/6278 (2.5%) were diagnosed with SUD during the follow-up. ADHD case status was associated with SUD during the follow-up (HR = 3.84, 95% CI 2.69-5.50). After adjustments for sex, family structure, and parental psychiatric disorder and early substance use the association with ADHD case status and SUD remained statistically significant (HR = 2.60, 95% CI 1.70-3.98). The risk of SUD remained elevated in individuals with ADHD case status irrespective of ODD symptoms. CONCLUSIONS ADHD in adolescence was associated with incident SUD in those with and without symptoms of ODD. The association of ADHD and SUD persisted even after adjustment for a wide range of potential confounds. This emphasizes the need to identify preventative strategies for adolescents with ADHD so as to improve health outcomes.
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Affiliation(s)
- Antti Mustonen
- Faculty of Medicine and Health TechnologyTampere UniversityTampereFinland
- Department of PsychiatrySeinäjoki Central HospitalSeinäjokiFinland
- Research Unit of Population HealthUniversity of OuluOuluFinland
| | - Alina Rodriguez
- Department of Epidemiology and BiostatisticsSchool of Public Health, Imperial CollegeLondonUK
- Centre for Psychiatry and Mental HealthQueen Mary UniversityLondonUK
| | - James G. Scott
- Child Health Research CentreThe University of QueenslandSouth BrisbaneQueenslandAustralia
- Child and Youth Mental HealthChildren's Health QueenslandSouth BrisbaneQueenslandAustralia
| | - Miika Vuori
- Research Center for Child Psychiatry, INVEST Research FlagshipUniversity of TurkuTurkuFinland
- The Finnish Institute for Health and WelfareHelsinkiFinland
| | - Tuula Hurtig
- Research Unit of Clinical Medicine, PsychiatryUniversity of OuluOuluFinland
- Clinic of Child PsychiatryOulu University HospitalOuluFinland
- Medical Research Center OuluOulu University Hospital and University of OuluOuluFinland
| | - Anu‐Helmi Halt
- Research Unit of Clinical Medicine, PsychiatryUniversity of OuluOuluFinland
- Medical Research Center OuluOulu University Hospital and University of OuluOuluFinland
- Department of PsychiatryOulu University HospitalOuluFinland
| | - Jouko Miettunen
- Research Unit of Population HealthUniversity of OuluOuluFinland
- Medical Research Center OuluOulu University Hospital and University of OuluOuluFinland
| | | | - Solja Niemelä
- Department of PsychiatryUniversity of TurkuTurkuFinland
- Addiction Psychiatry Unit, Department of PsychiatryTurku University HospitalTurkuFinland
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Mak JKL, Kananen L, Qin C, Kuja‐Halkola R, Tang B, Lin J, Wang Y, Jääskeläinen T, Koskinen S, Lu Y, Magnusson PKE, Hägg S, Jylhävä J. Unraveling the metabolic underpinnings of frailty using multicohort observational and Mendelian randomization analyses. Aging Cell 2023; 22:e13868. [PMID: 37184129 PMCID: PMC10410014 DOI: 10.1111/acel.13868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/26/2023] [Accepted: 04/29/2023] [Indexed: 05/16/2023] Open
Abstract
Identifying metabolic biomarkers of frailty, an age-related state of physiological decline, is important for understanding its metabolic underpinnings and developing preventive strategies. Here, we systematically examined 168 nuclear magnetic resonance-based metabolomic biomarkers and 32 clinical biomarkers for their associations with frailty. In up to 90,573 UK Biobank participants, we identified 59 biomarkers robustly and independently associated with the frailty index (FI). Of these, 34 associations were replicated in the Swedish TwinGene study (n = 11,025) and the Finnish Health 2000 Survey (n = 6073). Using two-sample Mendelian randomization, we showed that the genetically predicted level of glycoprotein acetyls, an inflammatory marker, was statistically significantly associated with an increased FI (β per SD increase = 0.37%, 95% confidence interval: 0.12-0.61). Creatinine and several lipoprotein lipids were also associated with increased FI, yet their effects were mostly driven by kidney and cardiometabolic diseases, respectively. Our findings provide new insights into the causal effects of metabolites on frailty and highlight the role of chronic inflammation underlying frailty development.
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Affiliation(s)
- Jonathan K. L. Mak
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
| | - Laura Kananen
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
- Faculty of Social Sciences (Health Sciences) and Gerontology Research Center (GEREC)University of TampereTampereFinland
| | - Chenxi Qin
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
| | - Ralf Kuja‐Halkola
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
| | - Bowen Tang
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
| | - Jake Lin
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
- Faculty of Social Sciences (Health Sciences) and Gerontology Research Center (GEREC)University of TampereTampereFinland
- Institute for Molecular Medicine Finland FIMM, Helsinki Institute of Life Science HiLIFE, University of HelsinkiHelsinkiFinland
| | - Yunzhang Wang
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
- Department of Clinical Sciences, Danderyd HospitalKarolinska InstitutetStockholmSweden
| | | | | | - Yi Lu
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
- Department of Global Public HealthKarolinska InstitutetStockholmSweden
| | - Patrik K. E. Magnusson
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
| | - Sara Hägg
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
| | - Juulia Jylhävä
- Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden
- Faculty of Social Sciences (Health Sciences) and Gerontology Research Center (GEREC)University of TampereTampereFinland
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Halmesvaara O, Vornanen M, Kääriäinen H, Perola M, Kristiansson K, Konttinen H. Psychosocial Effects of Receiving Genome-Wide Polygenic Risk Information Concerning Type 2 Diabetes and Coronary Heart Disease: A Randomized Controlled Trial. Front Genet 2022; 13:881349. [PMID: 35706448 PMCID: PMC9189371 DOI: 10.3389/fgene.2022.881349] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 04/28/2022] [Indexed: 11/23/2022] Open
Abstract
Receiving polygenic risk estimates of future disease through health care or direct-to-consumer companies is expected to become more common in the coming decades. However, only a limited number of studies have examined if such estimates might evoke an adverse psychosocial reaction in receivers. The present study utilized data from a sub-section of a personalized medicine project (the P5 study) that combines genomic and traditional health data to evaluate participants’ risk for certain common diseases. We investigated how communication of future disease risk estimates related to type 2 diabetes and coronary heart disease influenced respondents’ risk perception, self-efficacy, disease-related worry, and other emotions. A randomized controlled trial was conducted, where the experimental group (n = 714) received risk estimates based on traditional and polygenic risk factors and the control group (n = 649) based solely on traditional risk factors. On average, higher disease risk was associated with higher perceived risk (ps, <0.001, ηp2 = 0.087–0.071), worry (ps <0.001, ηp2 = 0.061–0.028), lower self-efficacy (p <0 .001, ηp2 = 0.012), less positive emotions (ps <0.04, ηp2 = 0.042–0.005), and more negative emotions (ps <0.048, ηp2 = 0.062–0.006). However, we found no evidence that adding the polygenic risk to complement the more traditional risk factors would induce any substantive psychosocial harm to the recipients (ps >0.06).
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Affiliation(s)
- Otto Halmesvaara
- Social Psychology, Faculty of Social Sciences, University of Helsinki, Helsinki, Finland
- *Correspondence: Otto Halmesvaara,
| | - Marleena Vornanen
- Social Psychology, Faculty of Social Sciences, University of Helsinki, Helsinki, Finland
- Motion Analysis Laboratory, Children’s Hospital, Helsinki University Hospital, Helsinki, Finland
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Helena Kääriäinen
- Department of Public Health and Welfare, Finnish Institute for Health and Welfare, Helsinki, Finland
| | - Markus Perola
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Department of Public Health and Welfare, Finnish Institute for Health and Welfare, Helsinki, Finland
| | - Kati Kristiansson
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Department of Public Health and Welfare, Finnish Institute for Health and Welfare, Helsinki, Finland
| | - Hanna Konttinen
- Social Psychology, Faculty of Social Sciences, University of Helsinki, Helsinki, Finland
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Paavilainen E, Tertti K, Nikkinen H, Veijola R, Vääräsmäki M, Loo B, Tossavainen P, Rönnemaa T, Niinikoski H. Metformin versus insulin therapy for gestational diabetes: Effects on offspring anthropometrics and metabolism at the age of 9 years: A follow-up study of two open-label, randomized controlled trials. Diabetes Obes Metab 2022; 24:402-410. [PMID: 34738701 PMCID: PMC9299154 DOI: 10.1111/dom.14589] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 10/22/2021] [Accepted: 10/31/2021] [Indexed: 12/12/2022]
Abstract
AIMS To compare anthropometrics, and lipid and glucose metabolism in the 9-year-old offspring of mothers treated with metformin or insulin for gestational diabetes mellitus (GDM). MATERIALS AND METHODS This was a Finnish two-centre, 9-year follow-up study of two open-label, randomized controlled trials comparing the effects observed in the offspring of mothers who received metformin and insulin treatment for GDM. Measurements included anthropometrics, blood pressure, lipoproteins, and oral glucose tolerance tests. This study was registered with ClinicalTrials.gov, number NCT02417090. RESULTS At the age of 9 years 172 children (55% of the original study cohort, 82 from the metformin and 90 from the insulin group) participated in the study. No differences were found between the 9-year-old offspring groups in anthropometric variables, including body mass index and waist-to-height ratio. The offspring in the metformin group had higher high-density lipoprotein (HDL) cholesterol concentrations (1.72 vs. 1.54 mmol/L; P = 0.039) but lower low-density lipoprotein cholesterol (2.39 vs. 2.58 mmol/L; P = 0.046) and apolipoprotein B concentrations (0.63 vs. 0.67 g/L; P = 0.043) than the offspring in the insulin group. The difference in HDL cholesterol concentration was found to be significant only in boys (P = 0.003). The 2-hour glucose value in the oral glucose tolerance test was 0.6-mmol/L lower in boys from the metformin group than in those from the insulin group (P = 0.015). CONCLUSIONS Metformin treatment for GDM is associated with similar offspring growth and glucose metabolism but a more favourable lipid profile at the age of 9 years as compared to insulin treatment.
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Affiliation(s)
- Elisa Paavilainen
- Department of Paediatrics and Adolescent MedicineUniversity of Turku and Turku University HospitalTurkuFinland
| | - Kristiina Tertti
- Department of Obstetrics and GynaecologyUniversity of Turku and Turku University HospitalTurkuFinland
| | - Hilkka Nikkinen
- Department of Obstetrics and Gynaecology, PEDEGO Research Unit, Medical Research CenterUniversity of Oulu and Oulu University HospitalOuluFinland
| | - Riitta Veijola
- Department of Paediatrics, PEDEGO Research Unit, Medical Research CentreUniversity of Oulu and Oulu University HospitalOuluFinland
| | - Marja Vääräsmäki
- Department of Obstetrics and Gynaecology, PEDEGO Research Unit, Medical Research CenterUniversity of Oulu and Oulu University HospitalOuluFinland
| | - Britt‐Marie Loo
- Joint Clinical Biochemistry Laboratory of University of Turku and Turku University HospitalTurkuFinland
| | - Päivi Tossavainen
- Department of Paediatrics, PEDEGO Research Unit, Medical Research CentreUniversity of Oulu and Oulu University HospitalOuluFinland
| | - Tapani Rönnemaa
- Department of MedicineUniversity of Turku and Division of Medicine, Turku University HospitalTurkuFinland
| | - Harri Niinikoski
- Department of Paediatrics and Adolescent MedicineUniversity of Turku and Turku University HospitalTurkuFinland
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Haapala EA, Leppänen MH, Lehti M, Lintu N, Tompuri T, Viitasalo A, Schwab U, Lakka TA. Cross-sectional associations between cardiorespiratory fitness and NMR-derived metabolic biomarkers in children - the PANIC study. Front Endocrinol (Lausanne) 2022; 13:954418. [PMID: 36213296 PMCID: PMC9538338 DOI: 10.3389/fendo.2022.954418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 09/12/2022] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE Cardiorespiratory fitness has been inversely associated with cardiovascular risk across the lifespan. Some studies in adults suggest that higher cardiorespiratory fitness is associated with cardioprotective metabolite profile, but the evidence in children is lacking. Therefore, we investigated the cross-sectional association of cardiorespiratory fitness with serum nuclear magnetic resonance derived metabolic biomarkers in children. METHODS A population sample of 450 children aged 6-8 years was examined. Cardiorespiratory fitness was assessed by a maximal exercise test on a cycle ergometer and quantified as maximal power output normalised for lean body mass assessed by dual-energy X-ray absorbtiometry. Serum metabolites were assessed using a high throughput nuclear magnetic resonance platform. The data were analysed using linear regression analyses adjusted for age and sex and subsequently for body fat percentage (BF%) assessed by DXA. RESULTS Cardiorespiratory fitness was directly associated with high density lipoprotein (HDL) cholesterol (β=0.138, 95% CI=0.042 to 0.135, p=0.005), average HDL particle diameter (β=0.102, 95% CI=0.004 to 0.199, p=0.041), and the concentrations of extra-large HDL particles (β=0.103, 95% CI=0.006 to 0.201, p=0.038), large HDL particles (β=0.122, 95% CI=0.025 to 0.220, p=0.014), and medium HDL particles (β=0.143, 95% CI=0.047 to 0.239, p=0.004) after adjustment for age and sex. Higher cardiorespiratory fitness was also associated with higher concentrations of ApoA1 (β=0.145, 95% CI=0.047 to 0.242, p=0.003), glutamine (β=0.161, 95% CI=0.064 to 0.257, p=0.001), and phenylalanine (β=0.187, 95% CI=0.091 to 0.283, p<0.001). However, only the direct associations of cardiorespiratory fitness with the concentrations of HDL cholesterol (β=0.114, 95% CI=0.018 to 0.210, p=0.021), medium HDL particles (β=0.126, 95% CI=0.030 to 0.223, p=0.010), ApoA1 (β=0.126, 95% CI=0.030 to 0.223, p=0.011), glutamine (β=0.147, 95% CI=0.050 to 0.224, p=0.003), and phenylalanine (β=0.217, 95% CI=0.122 to 0.311, p<0.001) remained statistically significant after further adjustment for BF%. CONCLUSIONS Higher cardiorespiratory fitness was associated with a cardioprotective biomarker profile in children. Most associations were independent of BF% suggesting that the differences in serum metabolites between children are driven by cardiorespiratory fitness and not adiposity.
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Affiliation(s)
- Eero A. Haapala
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
- Institute of Biomedicine, School of Medicine, University of Eastern Finland, Kuopio, Finland
- *Correspondence: Eero A. Haapala,
| | - Marja H. Leppänen
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
- Folkhälsan Research Center, Helsinki, Finland
| | - Maarit Lehti
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
| | - Niina Lintu
- Institute of Biomedicine, School of Medicine, University of Eastern Finland, Kuopio, Finland
| | - Tuomo Tompuri
- Institute of Biomedicine, School of Medicine, University of Eastern Finland, Kuopio, Finland
- Department of Clinical Physiology and Nuclear Medicine, Kuopio University Hospital, Kuopio, Finland
| | - Anna Viitasalo
- Institute of Biomedicine, School of Medicine, University of Eastern Finland, Kuopio, Finland
| | - Ursula Schwab
- Institute of Public Health and Clinical Nutrition, School of Medicine, University of Eastern Finland, Kuopio, Finland
- Department of Medicine, Endocrinology and Clinical Nutrition, Kuopio University Hospital, Kuopio, Finland
| | - Timo A. Lakka
- Institute of Biomedicine, School of Medicine, University of Eastern Finland, Kuopio, Finland
- Department of Clinical Physiology and Nuclear Medicine, Kuopio University Hospital, Kuopio, Finland
- Foundation for Research in Health Exercise and Nutrition, Kuopio Research Institute of Exercise Medicine, Kuopio, Finland
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Kalaoja M, Corbin LJ, Tan VY, Ahola‐Olli AV, Havulinna AS, Santalahti K, Pitkänen N, Lehtimäki T, Lyytikäinen L, Raitoharju E, Seppälä I, Kähönen M, Ripatti S, Palotie A, Perola M, Viikari JS, Jalkanen S, Maksimow M, Salomaa V, Salmi M, Raitakari OT, Kettunen J, Timpson NJ. The Role of Inflammatory Cytokines as Intermediates in the Pathway from Increased Adiposity to Disease. Obesity (Silver Spring) 2021; 29:428-437. [PMID: 33491305 PMCID: PMC8614117 DOI: 10.1002/oby.23060] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/18/2020] [Accepted: 09/21/2020] [Indexed: 12/28/2022]
Abstract
OBJECTIVE This study aimed to investigate the role of cytokines as intermediates in the pathway from increased adiposity to disease. METHODS BMI and circulating levels of up to 41 cytokines were measured in individuals from three Finnish cohort studies (n = 8,293). Mendelian randomization (MR) was used to assess the impact of BMI on circulating cytokines and the impact of BMI-driven cytokines on risk of obesity-related diseases. RESULTS Observationally, BMI was associated with 19 cytokines. For every SD increase in BMI, causal effect estimates were strongest for hepatocyte growth factor, monocyte chemotactic protein-1 (MCP-1), and tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) and were as ratios of geometric means 1.13 (95% CI: 1.08-1.19), 1.08 (95% CI: 1.04-1.14), and 1.13 (95% CI: 1.04-1.21), respectively. TRAIL was associated with a small increase in the odds of coronary artery disease (odds ratio: 1.03; 95% CI: 1.00-1.06). There was inconsistent evidence for a protective role of MCP-1 against inflammatory bowel diseases. CONCLUSIONS Observational and MR estimates of the effect of BMI on cytokine levels were generally concordant. There was little evidence for an effect of raised levels of BMI-driven cytokines on disease. These findings illustrate the challenges of MR when applied in the context of molecular mediation.
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