Evidence map›Paper›PMID 31504541›Full record

ArticleInternational journal of epidemiology2019

Assessing causal links between metabolic traits, inflammation and schizophrenia: a univariable and multivariable, bidirectional Mendelian-randomization study.

Bochao D Lin, Anne Alkema, Triinu Peters, Janneke Zinkstok, Lars Libuda, Johannes Hebebrand, Jochen Antel, Anke Hinney, Wiepke Cahn, Roger Adan and 1 more

Open access · bronzeAbstract read
In one paragraph

Article in International journal of epidemiology, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 36 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
36citing papers in PubMed, 3 pooled it
3.4field-weighted citation impact, top 7% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

36 citing papers in PubMed, 3 syntheses or guidelines pooled it, 53 citations in OpenAlex.

  1. Pooled it
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  4. Article
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  6. Causal links among gut microbiota, immune-inflammatory and compensatory immune-regulatory systems, and schizophrenia.Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2026
    Article
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  8. Very low-density lipoprotein and the human health.World journal of experimental medicine · 2026
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

11 authors at 6 institutions in 3 countries.

Bochao D LinDepartment of Psychiatry, UMC Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands.
Anne AlkemaDepartment of Psychiatry, UMC Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands.
Triinu PetersDepartment of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, University of Duisburg-Essen, University Hospital Essen, Essen, Germany.
Janneke ZinkstokDepartment of Psychiatry, UMC Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands.
Lars LibudaDepartment of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, University of Duisburg-Essen, University Hospital Essen, Essen, Germany.
Johannes HebebrandDepartment of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, University of Duisburg-Essen, University Hospital Essen, Essen, Germany.
Jochen AntelDepartment of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, University of Duisburg-Essen, University Hospital Essen, Essen, Germany.
Anke HinneyDepartment of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, University of Duisburg-Essen, University Hospital Essen, Essen, Germany.
Wiepke CahnDepartment of Psychiatry, UMC Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands.
Roger AdanDepartment of Translational Neuroscience, UMC Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands.
Jurjen J LuykxDepartment of Psychiatry, UMC Utrecht Brain Center, Utrecht University, Utrecht, The Netherlands.
University of Duisburg-Essen · DEUniversity Medical Center Utrecht · NLUtrecht University · NLEssen University Hospital · DEGGNet · NLHenan University · CN

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundBlood immunoreactive biomarkers, such as C-reactive protein (CRP), and metabolic abnormalities have been associated with schizophrenia. Studies comprehensively and bidirectionally probing possible causal links between such blood constituents and liability to schizophrenia are lacking.

methodsTo disentangle putative causal links between CRP blood levels and schizophrenia in both directions, we conducted multiple univariable Mendelian-randomization (MR) analyses, ranging from fixed-effect to inverse variance-weighted (IVW), weighted-median, MR Egger and generalized summary-data-based Mendelian-randomization (GSMR) models. To prioritize metabolic risk factors for schizophrenia, a novel multivariable approach was applied: multivariable Mendelian-randomization-Bayesian model averaging (MR-BMA).

resultsAll forward univariable MR analyses consistently showed that CRP has a protective effect on schizophrenia, whereas reverse MR analyses consistently suggested absent causal effects of schizophrenia liability on CRP blood levels. Using MR-BMA, as the top protective factors for schizophrenia we prioritized leucine and as the prime risk-factor triglycerides in medium very-low-density lipoprotein (VLDL). The five best-performing MR-BMA models provided one additional risk factor: triglycerides in large VLDL; and two additional protective factors: citrate and lactate.

conclusionsOur results add to a growing body of literature hinting at metabolic changes-in particular of triglycerides-independently of medication status in schizophrenia. We also highlight the absent effects of genetic liability to schizophrenia on CRP levels.

Indexed as

Bayes TheoremBiomarkersC-Reactive ProteinGenetic Predisposition to DiseaseHumansInflammationLeucineLipidsLipoproteins, VLDLMendelian Randomization AnalysisPhenotypePolymorphism, Single NucleotideRisk FactorsSchizophreniaTriglyceridesBiomarkersC-Reactive ProteinLeucineLipidsLipoproteins, VLDLTriglyceridesvery low density lipoprotein triglycerideblood metabolitesC-reactive proteinMendelian randomizationschizophrenia

Identifiers

PMID31504541
PMCPMC7070229
OpenAlexW2970332657

What OpenQuestion holds

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LicenceCC BY-NC
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.