Acute exposure to high-fat diet impairs ILC3 functions and gut homeostasis

Prolonged exposure to a high-fat diet (HFD) exacerbates intestinal disease pathology, yet the early events preceding the development of gut inflammation remain poorly understood. Here, we show that within 48 h, HFD impairs intestinal group 3 innate lymphoid cells (ILC3s) and their capacity to produce interleukin-22 (IL-22), critical for maintaining gut homeostasis. This loss of function was associated with rapid dysbiosis, increased gut permeability, and reduced production of antimicrobial peptides, mucus, and tight-junction proteins. While saturated fatty acids metabolized through oxidation impaired ILC3 function, unsaturated fatty acids sustained IL-22 secretion by ILC3s through the formation of lipid droplets using diacylglycerol O-acyltransferase (DGAT) enzymes. Upon inflammation, saturated fatty acids impaired IL-22 production by ILC3s and increased the susceptibility of the gut to injury. Our findings reveal the differential acute impact of saturated and unsaturated fatty acids on gut homeostasis through distinct metabolic pathways in ILC3s.

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Publication Details

Journal
Immunity
Published
2025-04-14
DOI
https://doi.org/10.1016/j.immuni.2025.03.017
Citations
35
Primary Topic
IL-33, ST2, and ILC Pathways
Type
article
Field-Weighted Citation Impact
27.91

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article

Acute exposure to high-fat diet impairs ILC3 functions and gut homeostasis

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35 citations
Immunity
IL-33, ST2, and ILC Pathways
27.91
article

Acute exposure to high-fat diet impairs ILC3 functions and gut homeostasis

Stephen L. Nutt, Peter J. Meikle, Matthew Macowan, Alexandra L. Garnham, Shanti Diwakarla, Natalie A. Mellett, Benjamin J. Marsland, Roxanne Chatzis, Pooranee K. Morgan, Cyril Seillet, Olivia Artaiz, Graeme I. Lancaster, Le Xiong, Shengbo Zhang
article en
35 citations

Abstract

Prolonged exposure to a high-fat diet (HFD) exacerbates intestinal disease pathology, yet the early events preceding the development of gut inflammation remain poorly understood. Here, we show that within 48 h, HFD impairs intestinal group 3 innate lymphoid cells (ILC3s) and their capacity to produce interleukin-22 (IL-22), critical for maintaining gut homeostasis. This loss of function was associated with rapid dysbiosis, increased gut permeability, and reduced production of antimicrobial peptides, mucus, and tight-junction proteins. While saturated fatty acids metabolized through oxidation impaired ILC3 function, unsaturated fatty acids sustained IL-22 secretion by ILC3s through the formation of lipid droplets using diacylglycerol O-acyltransferase (DGAT) enzymes. Upon inflammation, saturated fatty acids impaired IL-22 production by ILC3s and increased the susceptibility of the gut to injury. Our findings reveal the differential acute impact of saturated and unsaturated fatty acids on gut homeostasis through distinct metabolic pathways in ILC3s.

ImmunityVol. 58(5)
Baker Heart and Diabetes Institute (AU), The University of Melbourne (AU), Walter and Eliza Hall Institute of Medical Research (AU), Monash University (AU)
Australian Government, Medical Research Council, National Health and Medical Research Council
Zero hunger
Openalex Percentile: Top 0%
IL-33, ST2, and ILC Pathways
27.91
DOIOpen Access PDFOpenAlex
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