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mBio ; 14(5): e0120823, 2023 Oct 31.
Article in English | MEDLINE | ID: mdl-37768050

ABSTRACT

IMPORTANCE: Inflammatory bowel disease (IBD), including Crohn's disease and ulcerative colitis, impacts millions of individuals worldwide and severely impairs the quality of life for patients. Dysregulation of innate immune signaling pathways reduces barrier function and exacerbates disease progression. Macrophage (Mφ) signaling pathways are potential targets for IBD therapies. While multiple treatments are available for IBD, (i) not all patients respond, (ii) responses may diminish over time, and (iii) treatments often have undesirable side effects. Genetic studies have shown that the inheritance of two co-segregating SNPs expressed in the innate immune receptor, TLR4, is associated with human IBD. Mice expressing homologous SNPs ("TLR4-SNP" mice) exhibited more severe colitis than WT mice in a DSS-induced colonic inflammation/repair model. We identified a critical role for M2a "tissue repair" Mφ in the resolution of colitis. Our findings provide insight into potential development of novel therapies targeting Mφ signaling pathways that aim to alleviate the debilitating symptoms experienced by individuals with IBD.


Subject(s)
Colitis , Inflammatory Bowel Diseases , Humans , Mice , Animals , Toll-Like Receptor 4 , Polymorphism, Single Nucleotide , Quality of Life , Colitis/chemically induced , Macrophages , Inflammatory Bowel Diseases/chemically induced , Mice, Inbred C57BL , Disease Models, Animal
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