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ResearchIn-Press PreviewImmunologyInflammation Open Access | 10.1172/jci.insight.192830

Systemic reprogramming of monocytes in Crohn’s disease promotes their intestinal inflammatory function

Eve Hornsby,1 Radha Gadhok,1 Inva Hoti,1 Eva Wozniak,2 James R. Boot,2 Emma Connick,2 Paul A Stevens,2 Holly Creed,1 Amy Lewis,3 Andrew Silver,3 James O Lindsay,1 and Andrew J. Stagg1

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Hornsby, E. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Gadhok, R. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Hoti, I. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Wozniak, E. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Boot, J. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Connick, E. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Stevens, P. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Creed, H. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Lewis, A. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Silver, A. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Lindsay, J. in: PubMed | Google Scholar

1Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom

2Genome Centre, Queen Mary University of London, London, United Kingdom

3Centre for Genomics and Child Health, Queen Mary University of London, London, United Kingdom

Find articles by Stagg, A. in: PubMed | Google Scholar

Published August 11, 2026 - More info

JCI Insight. https://doi.org/10.1172/jci.insight.192830.
Copyright © 2026, Hornsby et al. This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Published August 11, 2026 - Version history
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Abstract

Bone marrow-derived circulating monocytes continuously replenish intestinal macrophages, which become dysregulated in inflammatory bowel disease (IBD) and contribute to disease pathology. The origins of this dysregulation remain poorly understood. Here, we investigate the reprogramming of circulating monocytes in IBD prior to tissue recruitment using single-cell transcriptomic, epigenomic and functional approaches. We characterise blood monocyte heterogeneity in newly diagnosed, treatment-naïve IBD patients and healthy controls and show that monocytes in Crohn’s disease (CD) display a distinct transcriptional profile and altered distributions across inferred developmental trajectories; less pronounced changes are observed in ulcerative colitis (UC). We link CD-associated transcriptional changes to alterations in chromatin accessibility and identify NFB, EGR, KLF and AP-1 family transcription factors as putative regulators of an inflammatory gene program in blood monocytes from CD patients. We uncover a potential role for IFN- in priming blood monocytes for inflammatory function in CD by limiting their capacity to be regulated by IL-10. Finally, we show that the transcriptional and functional alterations in monocytes from CD patients are maintained in monocyte-derived cells from the intestine. Together these data suggest that intestinal macrophage dysfunction in CD is, at least in part, pre-established by systemic signals prior to tissue recruitment.

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