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Techniques and Methods

Butyrate and tributyrin reduce LPS-induced inflammatory cytokine production from human visceral fat

Abstract

Introduction

The current obesity crisis has resulted in many people with excess adipose tissue suffering from chronic inflammation. This inflammation is largely due to the release of cytokines and chemokines from visceral fat. The aim of this study was to identify potential anti-inflammatory agents that might alleviate obesity-induced chronic inflammation.

Methods

To identify agents that might alleviate this obesity-induced chronic inflammation we have developed a simple protocol for incubating intact pieces of human visceral adipose tissue in 35 mm tissue culture plates, in the presence of low-dose lipopolysaccharide (LPS) and co-incubating these samples with potential anti-inflammatory agents. RNA-Seq analysis was performed to identify enriched gene expression signatures among the most significantly differentially expressed genes.

Results

From this screen, we have identified the short-chain fatty acid (SCFA) sodium butyrate and its triacylglyceride form, tributyrin, as effective agents, significantly reducing the production of LPS-induced inflammatory cytokines and chemokines from all adipose tissue samples tested. As well, these agents appear to be non-toxic at the concentrations tested. RNA-Seq analysis has revealed that IL36γ is one of the most upregulated genes in response to LPS and one of the most downregulated when sodium butyrate is added to human fat samples stimulated with LPS. IL-36γ ELISAs confirmed this holds true at the protein level as well.

Conclusions

These studies suggest that the short-chain fatty acid, sodium butyrate, and its triacylglyceride form, tributyrin, might alleviate the chronic inflammation that is associated with many individuals with obesity.

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Fig. 1: Development of the Ex-Vivo Visceral Fat Assay.
Fig. 2: Optimization of the Ex-Vivo Visceral Fat Assay.
Fig. 3: Ex-vivo Visceral Fat Screen Identifies Sodium Butyrate and Tributyrin as Potential Anti-Inflammatory Agents.
Fig. 4: Sodium Butyrate and Tributyrin Suppress LPS-induced Cytokines/Chemokines from Visceral Fat.
Fig. 5: RNA-seq analysis of intact visceral fat pieces stimulated or not with LPS ± sodium butyrate.

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Data availability

All data relevant to the study are included in the article.

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Acknowledgements

The research was supported by the Lotte and John Hecht Memorial Foundation (#3693), with core support from the BC Cancer Foundation and BC Cancer. This study was in part supported by Program Project Grant funding from the Terry Fox Research Institute (Grant No. 1108 to CS). MYL is a PhD candidate at the University of British Columbia, Canada, and is supported by an Elizabeth C. Watters Research Fellowship.

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Contributions

IE, GK, and HR conceptualized the study; IE, HR, MY, SK, MYL, SH, and LB performed experiments; IE, HR, MY, SK, SH, and GD analyzed data and figures; IE, MYL, GD, and GK wrote the first draft; IE, HR, MY, MYL, GD, DH, CS, and GK reviewed and revised the manuscript; NN, EY, and SS performed the bariatric surgeries; DH, JC, CS, and GK provided resources and supervision; all authors have read and agreed to the final version of the manuscript.

Corresponding author

Correspondence to Ingrid Elisia.

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Competing interests

CS has performed consultancy for Bayer and Eisai, and has received research funding from Epizyme and Trillium Therapeutics.

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Rafiei, H., Yeung, M., Kowalski, S. et al. Butyrate and tributyrin reduce LPS-induced inflammatory cytokine production from human visceral fat. Int J Obes 48, 1559–1567 (2024). https://doi.org/10.1038/s41366-024-01581-9

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