Evidence map›Paper›PMID 34684510›Full record

ArticleNutrients2021

Indole-3-Propionic Acid, a Gut-Derived Tryptophan Metabolite, Associates with Hepatic Fibrosis.

Ratika Sehgal, Mariana Ilha, Maija Vaittinen, Dorota Kaminska, Ville Männistö, Vesa Kärjä, Marjo Tuomainen, Kati Hanhineva, Stefano Romeo, Päivi Pajukanta and 2 more

Open access · goldAbstract read
In one paragraph

Article in Nutrients, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 49 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
49citing papers in PubMed, 1 pooled it
6.5field-weighted citation impact, top 2% 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

49 citing papers in PubMed, 1 synthesis or guideline pooled it, 64 citations in OpenAlex.

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  12. Intestinal-related substances in obesity regulation: A comprehensive review.World journal of gastrointestinal pharmacology and therapeutics · 2025
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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 3 countries.

Ratika SehgalDepartment of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70211 Kuopio, Finland.
Mariana IlhaDepartment of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70211 Kuopio, Finland.ORCID 0000-0001-9741-8865
Maija VaittinenDepartment of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70211 Kuopio, Finland.ORCID 0000-0002-7423-557X
Dorota KaminskaDepartment of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70211 Kuopio, Finland.ORCID 0000-0003-1829-576X
Ville MännistöDepartments of Medicine, University of Eastern Finland and Kuopio University Hospital, 70211 Kuopio, Finland.
Vesa KärjäDepartment of Pathology, University of Eastern Finland and Kuopio University Hospital, 70211 Kuopio, Finland.
Marjo TuomainenDepartment of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70211 Kuopio, Finland.
Kati HanhinevaDepartment of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70211 Kuopio, Finland.
Stefano RomeoDepartment of Molecular and Clinical Medicine, University of Gothenburg, 40530 Gothenburg, Sweden.
Päivi PajukantaDepartment of Human Genetics, David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA 90095, USA.
Jussi PihlajamäkiDepartment of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70211 Kuopio, Finland.
Vanessa D de MelloDepartment of Clinical Nutrition, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, 70211 Kuopio, Finland.
University of Eastern Finland · FIUniversity of California, Los Angeles · USUniversity of Gothenburg · SEUniversity of Turku · FI

Funding

Academy of Finland 321716, 138006, 324494, 316458ERA-NET NEURON 2019 translational biomarkers 334814Finnish Diabetes Research Foundation 64808Healh from science (TERVA) 404030Horizon 2020 Framework Programme MSCA, grant no. 740264Kuopio university hospital project grant EVO/VTR grants 2005-2019NIH grant HL-095056, HL-28481, U01 DK105561
6 · The paper itself

Abstract

BACKGROUND AND

aimsGut microbiota-derived metabolites play a vital role in maintenance of human health and progression of disorders, including obesity and type 2 diabetes (T2D). Indole-3-propionic acid (IPA), a gut-derived tryptophan metabolite, has been recently shown to be lower in individuals with obesity and T2D. IPA's beneficial effect on liver health has been also explored in rodent and cell models. In this study, we investigated the association of IPA with human liver histology and transcriptomics, and the potential of IPA to reduce hepatic stellate cell activation in vitro.

methodsA total of 233 subjects (72% women; age 48.3 ± 9.3 years; BMI 43.1 ± 5.4 kg/m

resultsCirculating IPA levels were found to be lower in individuals with liver fibrosis compared to those without fibrosis (

conclusionThe association of circulating IPA with liver fibrosis and the ability of IPA to reduce activation of LX-2 cells suggests that IPA may have a therapeutic potential. Further molecular studies are needed to investigate the mechanisms how IPA can ameliorate hepatic fibrosis.

Indexed as

AdultBariatric SurgeryCell AdhesionCell MovementFemaleGene ExpressionHepatic Stellate CellsHumansIndolesLiverLiver CirrhosisMaleMiddle AgedObesityRNA, MessengerTransforming Growth Factor beta1indolepropionic acidIndolesRNA, MessengerTransforming Growth Factor beta1gut microbiotahepatic fibrosishepatic stellate cellsindole-3-propionic acidnon-alcoholic fatty liver disease

Identifiers

PMID34684510
PMCPMC8538297
OpenAlexW3204613427

What OpenQuestion holds

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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.