Evidence map›Paper›PMID 32899743›Full record

ReviewBiomolecules2020

Amino Acid Metabolism in Rheumatoid Arthritis: Friend or Foe?

Eleonora Panfili, Roberto Gerli, Ursula Grohmann, Maria Teresa Pallotta

Open access · goldAbstract readReview
In one paragraph

Review in Biomolecules, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers.

0numbers the graph read from it
0cells of the map it votes in
30citing papers in PubMed
1.9field-weighted citation impact, top 15% 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

30 citing papers in PubMed, 55 citations in OpenAlex.

  1. Nutrients · 2026
    Article
  2. Review
  3. Article
  4. Review
  5. Article
  6. Article
  7. Article
  8. Article
  9. Eosinophils in Rheumatoid Arthritis: A Multifaceted Role in the Pathogenesis of the Disease.Biocell : official journal of the Sociedades Latinoamericanas de Microscopia Electronica ... et. al · 2025
    Article
  10. Review
  11. Review
  12. Article
  13. Review
  14. Article
  15. Review
  16. Differences in IDO1Frontiers in immunology · 2024
    Article
  17. Article
  18. Review
  19. Gut-joint axis: Gut dysbiosis can contribute to the onset of rheumatoid arthritisFrontiers in cellular and infection microbiology · 2023
    Review
  20. Article
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

4 authors at 1 institution in 1 country.

Eleonora PanfiliDepartment of Experimental Medicine, University of Perugia, 06132 Perugia, Italy.ORCID 0000-0003-2466-2933
Roberto GerliDepartment of Medicine, University of Perugia, 06132 Perugia, Italy.
Ursula GrohmannDepartment of Experimental Medicine, University of Perugia, 06132 Perugia, Italy.ORCID 0000-0001-7952-1850
Maria Teresa PallottaDepartment of Experimental Medicine, University of Perugia, 06132 Perugia, Italy.ORCID 0000-0002-0417-1638
University of Perugia · IT

Funding

Associazione Italiana per la Ricerca sul Cancro 2019-23084Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR) 2017WJZ9W9
6 · The paper itself

Abstract

In mammals, amino acid metabolism has evolved to act as a critical regulator of innate and adaptive immune responses. Rheumatoid arthritis (RA) is the most common form of inflammatory arthropathy sustained by autoimmune responses. We examine here the current knowledge of tryptophan and arginine metabolisms and the main immunoregulatory pathways in amino acid catabolism, in both RA patients and experimental models of arthritis. We found that l-tryptophan (Trp) metabolism and, in particular, the kynurenine pathway would exert protective effects in all experimental models and in some, but not all, RA patients, possibly due to single nucleotide polymorphisms in the gene coding for indoleamine 2,3-dioxygenase 1 (IDO1; the enzyme catalyzing the rate-limiting step of the kynurenine pathway). The function, i.e., either protective or pathogenetic, of the l-arginine (Arg) metabolism in RA was less clear. In fact, although immunoregulatory arginase 1 (ARG1) was highly induced at the synovial level in RA patients, its true functional role is still unknown, possibly because of few available preclinical data. Therefore, our analysis would indicate that amino acid metabolism represents a fruitful area of research for new drug targets for a more effective and safe therapy of RA and that further studies are demanding to pursue such an important objective.

Indexed as

AnimalsArginineArthritis, RheumatoidHumansKynurenineMicrobiotaSerotoninTryptophanArginineKynurenineSerotoninTryptophanarginase 1 (ARG1)arginine metabolismaryl hydrocarbon receptor (AhR)indoleamine 2,3-dioxygenase 1 (IDO1)nitric oxide synthase (NOS)polyaminesrheumatoid arthritis (RA)tryptophan metabolism

Identifiers

PMID32899743
PMCPMC7563518
OpenAlexW3083115479

What OpenQuestion holds

Textmetadata
LicenceCC BY
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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.