Evidence map›Paper›PMID 34878333›Full record

ArticleMicrobiology spectrum2021

Amino Acid Metabolism is Significantly Altered at the Time of Admission in Hospital for Severe COVID-19 Patients: Findings from Longitudinal Targeted Metabolomics Analysis.

Laura Ansone, Monta Briviba, Ivars Silamikelis, Anna Terentjeva, Ingus Perkons, Liga Birzniece, Vita Rovite, Baiba Rozentale, Ludmila Viksna, Oksana Kolesova and 2 more

Open access · goldAbstract read
In one paragraph

Article in Microbiology spectrum, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 59 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
59citing papers in PubMed, 1 pooled it
10.6field-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.

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

59 citing papers in PubMed, 1 synthesis or guideline pooled it, 82 citations in OpenAlex.

  1. Pooled it
  2. Review
  3. Article
  4. Network-based integration of metabolomics data from large-scale repositories.Metabolomics : Official journal of the Metabolomic Society · 2026
    Article
  5. Host metabolic responses to SARS-CoV-2 and influenza viruses: parallels and contrasts.Metabolomics : Official journal of the Metabolomic Society · 2026
    Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

12 authors at 4 institutions in 1 country.

Laura Ansone *Latvian Biomedical Research and Study Centregrid.419210.f, Riga, Latvia.
Monta Briviba *Latvian Biomedical Research and Study Centregrid.419210.f, Riga, Latvia.
Ivars SilamikelisLatvian Biomedical Research and Study Centregrid.419210.f, Riga, Latvia.
Anna TerentjevaRiga Stradins University, Riga, Latvia.
Ingus PerkonsInstitute of Food Safety, Animal Health and Environment (BIOR), Riga, Latvia.
Liga BirznieceLatvian Biomedical Research and Study Centregrid.419210.f, Riga, Latvia.
Vita RoviteLatvian Biomedical Research and Study Centregrid.419210.f, Riga, Latvia.
Baiba RozentaleRiga Stradins University, Riga, Latvia.
Ludmila ViksnaRiga Stradins University, Riga, Latvia.
Oksana KolesovaRiga Stradins University, Riga, Latvia.
Kristaps KlavinsRiga Technical University, Riga, Latvia.
Janis KlovinsLatvian Biomedical Research and Study Centregrid.419210.f, Riga, Latvia.ORCID 0000-0001-8362-5505
Latvian Biomedical Research and Study Centre · LVRiga Stradiņš University · LVInstitute of Food Safety, Animal Health and Environment “BIOR” · LVRiga Technical University · LV

Funding

Izglītības un zinātnes ministrija (Ministry of Education and Science, Republic of Latvia) VPP-COVID-2020/1-0016
6 · The paper itself

Abstract

The heterogeneity in severity and outcome of COVID-19 cases points out the urgent need for early molecular characterization of patients followed by risk-stratified care. The main objective of this study was to evaluate the fluctuations of serum metabolomic profiles of COVID-19 patients with severe illness during the different disease stages in a longitudinal manner. We demonstrate a distinct metabolomic signature in serum samples of 32 hospitalized patients at the acute phase compared to the recovery period, suggesting the tryptophan (tryptophan, kynurenine, and 3-hydroxy-DL-kynurenine) and arginine (citrulline and ornithine) metabolism as contributing pathways in the immune response to SARS-CoV-2 with a potential link to the clinical severity of the disease. In addition, we suggest that glutamine deprivation may further result in inhibited M2 macrophage polarization as a complementary process, and highlight the contribution of phenylalanine and tyrosine in the molecular mechanisms underlying the severe course of the infection. In conclusion, our results provide several functional metabolic markers for disease progression and severe outcome with potential clinical application.

Indexed as

HospitalsMetabolomeSeverity of Illness IndexAmino AcidsBiomarkersCOVID-19Host Microbial InteractionsHumansKynurenineMetabolomicsSARS-CoV-23-hydroxykynurenineAmino AcidsBiomarkersKynurenineCOVID-19longitudinal studymetabolomicsSARS-CoV-2virus-host interactions

Identifiers

PMID34878333
PMCPMC8653833
OpenAlexW4200207043

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

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.