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Indole-3-propionic acid, a gut-derived tryptophan metabolite, associates with hepatic fibrosis

Männistö Ville; Kaminska Dorota; Kärjä Vesa; Sehgal Ratika; Ilha Mariana; Romeo Stefano; Pihlajamäki Jussi; Hanhineva Kati; Pajukanta Päivi; Vaittinen Maija; Tuomainen Marjo; de Mello Vanessa D.

Indole-3-propionic acid, a gut-derived tryptophan metabolite, associates with hepatic fibrosis

Männistö Ville
Kaminska Dorota
Kärjä Vesa
Sehgal Ratika
Ilha Mariana
Romeo Stefano
Pihlajamäki Jussi
Hanhineva Kati
Pajukanta Päivi
Vaittinen Maija
Tuomainen Marjo
de Mello Vanessa D.
Katso/Avaa
Publisher's PDF (2.001Mb)
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MDPI
doi:10.3390/nu13103509
URI
https://www.mdpi.com/2072-6643/13/10/3509
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021110554168
Tiivistelmä


Background and Aims: Gut 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.

Methods: A total of 233 subjects (72% women; age 48.3 ± 9.3 years; BMI 43.1 ± 5.4 kg/m2) undergoing bariatric surgery with detailed liver histology were included. Circulating IPA levels were measured using LC-MS and liver transcriptomics with total RNA-sequencing. LX-2 cells were used to study hepatoprotective effect of IPA in cells activated by TGF-β1.

Results: Circulating IPA levels were found to be lower in individuals with liver fibrosis compared to those without fibrosis (p = 0.039 for all participants; p = 0.013 for 153 individuals without T2D). Accordingly, levels of circulating IPA associated with expression of 278 liver transcripts (p < 0.01) that were enriched for the genes regulating hepatic stellate cells (HSCs) activation and hepatic fibrosis signaling. Our results suggest that IPA may have hepatoprotective potential because it is able to reduce cell adhesion, cell migration and mRNA gene expression of classical markers of HSCs activation in LX-2 cells (all p < 0.05).

Conclusion: The 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.

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