Evidence map›Paper›PMID 34119855›Full record

ArticlePsychoneuroendocrinology2021

Interleukin-6 as potential mediator of long-term neuropsychiatric symptoms of COVID-19.

Nils Kappelmann, Robert Dantzer, Golam M Khandaker

Registry-linked trialOpen access · greenAbstract read
In one paragraph

Article in Psychoneuroendocrinology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT06940609 (Magnetic Resonance Analysis of Neural Inflammatory Factors and External Stimulation), which is not on this map. Cited by 78 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
78citing papers in PubMed, 4 pooled it
12.6field-weighted citation impact, top 1% 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.

NCT06940609 phase2recruitingnot on this mapstarted 2025, after this paper: background citation

Magnetic Resonance Analysis of Neural Inflammatory Factors and External Stimulation (MANIFEST)

TypeinterventionalSponsorUniversity of New MexicoRan2025 to 2029Enrolled60ConditionsLong COVID, Long COVID Syndrome, Long COVID-19 Syndrome, PASCArmsaccelerated intermittent theta burst stimulation
3 · Its place in the literature

Who cites it

78 citing papers in PubMed, 4 syntheses or guidelines pooled it, 147 citations in OpenAlex.

  1. Pooled it
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  7. Cost-effectiveness of plasmapheresis and hemoperfusion in COVID-19 survivors: A six-month follow-up analysis after hospital discharge.Therapeutic apheresis and dialysis : official peer-reviewed journal of the International Society for Apheresis, the Japanese Society for Apheresis, the Japanese Society for Dialysis Therapy · 2026
    Article
  8. Choroid plexus alterations in long COVID and their associations with IL-6.European archives of psychiatry and clinical neuroscience · 2026
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  15. Toward characterizing brain fog in long COVID: correlates and impact on measurement metrics.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2026
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18 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors at 3 institutions in 3 countries.

Nils KappelmannDepartment of Research in Translational Psychiatry, Max-Planck-Institute of Psychiatry, Munich, Germany; International Max Planck Research School for Translational Psychiatry (IMPRS-TP), Munich, Germany. Electronic address: n.kappelmann@gmail.com.
Robert DantzerDepartment of Symptom Research, University of Texas MD Anderson Cancer Centre, Houston, TX, USA.
Golam M KhandakerMRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK; Centre for Academic Mental Health, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK; Department of Psychiatry, University of Cambridge, Cambridge, UK; Cambridgeshire and Peterborough NHS Foundation Trust, Cambridge, UK.
Cambridgeshire and Peterborough NHS Foundation Trust · GBMax Planck Institute of Psychiatry · DEThe University of Texas MD Anderson Cancer Center · US

Funding

Tumor Evolution and Metastasis ProgramP30CA016672 · NCI · UNIVERSITY OF TX MD ANDERSON CAN CTR · PI Scott Kopetz · 1985 to 2026
$290.8M
Neuroimmune Mechanisms of Recovery from Comorbid Depression and Chronic PainR01NS073939 · NINDS · UNIVERSITY OF TX MD ANDERSON CAN CTR · PI DANTZER, ROBERT, HEIJNEN, COBI J · 2011 to 2020
$4.0M
The Metabolic Basis of Cancer-Related FatigueR01CA193522 · NCI · UNIVERSITY OF TX MD ANDERSON CAN CTR · PI DANTZER, ROBERT · 2015 to 2023
$3.8M
Medical Research Council MC_PC_17213Medical Research Council MR/S037675/1NCI NIH HHS P30 CA016672NCI NIH HHS R01 CA193522NINDS NIH HHS R01 NS073939Wellcome Trust 201486/Z/16/Z
6 · The paper itself

Abstract

The majority of COVID-19 survivors experience long-term neuropsychiatric symptoms such as fatigue, sleeping difficulties, depression and anxiety. We propose that neuroimmune cross-talk via inflammatory cytokines such as interleukin-6 (IL-6) could underpin these long-term COVID-19 symptoms. This hypothesis is supported by several lines of research, including population-based cohort and genetic Mendelian Randomisation studies suggesting that inflammation is associated with fatigue and sleeping difficulties, and that IL-6 could represent a possible causal driver for these symptoms. Immune activation following COVID-19 can disrupt T helper 17 (T

Indexed as

AnimalsAnxietyCohort StudiesCOVID-19DepressionFatigueHumansInterleukin-6Mental DisordersNeuroimmunomodulationPost-Acute COVID-19 SyndromeSARS-CoV-2Sleep Wake DisordersSurvivorsInterleukin-6COVID-19DepressionFatigueInterleukin-6Long COVIDSleep

Identifiers

PMID34119855
PMCPMC8172271
OpenAlexW3172303478

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

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.