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Effects of the dietary fibre inulin and Trichuris suis products on inflammatory responses in lipopolysaccharide-stimulated macrophages.

Abstract：

:Consumption of fermentable dietary fibres, such as inulin, or administration of helminth products (e.g. Trichuris suis ova) have independently been shown to alleviate inflammation in vivo. We recently found that dietary inulin and T. suis infection in pigs co-operatively suppressed type-1 inflammatory responses in the gut, suggesting the potential of dietary components to augment anti-inflammatory responses induced by certain helminths. Here, we explored whether T. suis antigens and inulin could directly suppress inflammatory responses in vitro in a cooperative manner. T. suis soluble products (TsSP) strongly suppressed lipopolysaccharide (LPS)-induced IL-6 and TNF-α secretion from murine macrophages and induced an anti-inflammatory phenotype as evidenced by transcriptomic and gene pathway analyses. Inulin regulated the expression of a small number of genes and transcriptional pathways in macrophages after exposure to LPS, but did not enhance the suppressive activity of TsSP, either directly or in co-culture experiments with intestinal epithelial cells. Culture of macrophages with short-chain fatty acids, the products of microbial fermentation of inulin, did however appear to enhance TsSP-mediated inhibition of TNF-α production. Our results confirm a direct role for helminth products in suppressing inflammatory responses in macrophages. In contrast, inulin had little capacity to directly modulate LPS-induced responses. Our results suggest distinct mode-of-actions of T. suis and inulin in regulating inflammatory responses, and that the role of inulin in modulating the response to helminth infection may be dependent on other factors such as production of metabolites by the gut microbiota.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Myhill LJ,Jensen P,Zakeri A,Nielsen LF,Jakobsen SR,Mejer H,Thamsborg SM,Nejsum P,Williams AR

doi

10.1016/j.molimm.2020.03.006

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

127-135

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(19)30918-6

journal_volume

121

pub_type

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