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CD36 deficiency causes intestinal extracellular matrix disruption and chronic neutrophil

ABSTRACT: BACKGROUND & AIMS: The scavenger receptor CD36 has versatile immuno-metabolic actions. CD36 is abundantly expressed in the small intestinal epithelium but its impact on gut homeostasis is unknown. METHODS: Wild type (WT) and CD36-null (CD36KO) mice were fed a chow diet and small intestinal morphology assessed by immunohistochemistry and electron microscopy (EM). Inflammation was evaluated from neutrophil infiltration, expression of cytokines and toll-like receptors. Barrier integrity was determined using FITC-dextran and circulating lipopolysaccharide (LPS). Enterocyte (Ent-CD36KO) and endothelial (EC-CD36KO) CD36 null mice were generated to test contribution of epithelial versus endothelial CD36 to the intestinal phenotype. RESULTS: The small intestine of CD36KO mice fed a chow diet showed abnormal remodeling of the extracellular matrix (ECM) with altered expression of ECM and junction proteins. Hypertrophy of cell junctions and basement membranes was observed by EM. The CD36KO intestines displayed neutrophil infiltration, inflammation and compromised barrier function. Systemic leukocytosis and neutrophilia were present in CD36KO mice and there was 80% reduction of anti-inflammatory Ly6Clow monocytes important for ECM regulation and tissue repair. Bone marrow transplants supported primary contribution of tissue injury in initiation of inflammation. Studies with Ent-CD36KO mice did not support a major contribution of enterocyte CD36 while endothelial CD36 deficiency associated with neutrophil infiltration, aberrant expression of tight junctions and inflammation in the small intestine. CONCLUSION: CD36 is important for maintenance of barrier function in the small intestine. CD36 deletion causes ECM remodeling with collagen accumulation, depletion of the Ly6Clow monocyte subset and chronic inflammation. Endothelial but not enterocyte CD36 loss is a significant contributor to the spontaneous inflammation.

ORGANISM(S): Mus musculus

PROVIDER: GSE73569 | GEO | 2016/10/01

SECONDARY ACCESSION(S): PRJNA297353

REPOSITORIES: GEO

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Project description:Dunster2014 - WBC Interactions (Model1) This is a sub-model of a three-step inflammatory response modelling study. The model includes distinct populations of white blood cells namely, macrophages and active and apoptotic neutrophil populations. Neutrophil apoptosis rate is predicted to be crucial for the qualitative nature of the system. This model is described in the article: The resolution of inflammation: a mathematical model of neutrophil and macrophage interactions. Dunster JL, Byrne HM, King JR. Bull. Math. Biol. 2014 Aug; 76(8): 1953-1980 Abstract: There is growing interest in inflammation due to its involvement in many diverse medical conditions, including Alzheimer's disease, cancer, arthritis and asthma. The traditional view that resolution of inflammation is a passive process is now being superceded by an alternative hypothesis whereby its resolution is an active, anti-inflammatory process that can be manipulated therapeutically. This shift in mindset has stimulated a resurgence of interest in the biological mechanisms by which inflammation resolves. The anti-inflammatory processes central to the resolution of inflammation revolve around macrophages and are closely related to pro-inflammatory processes mediated by neutrophils and their ability to damage healthy tissue. We develop a spatially averaged model of inflammation centring on its resolution, accounting for populations of neutrophils and macrophages and incorporating both pro- and anti-inflammatory processes. Our ordinary differential equation model exhibits two outcomes that we relate to healthy and unhealthy states. We use bifurcation analysis to investigate how variation in the system parameters affects its outcome. We find that therapeutic manipulation of the rate of macrophage phagocytosis can aid in resolving inflammation but success is critically dependent on the rate of neutrophil apoptosis. Indeed our model predicts that an effective treatment protocol would take a dual approach, targeting macrophage phagocytosis alongside neutrophil apoptosis. This model is hosted on BioModels Database and identified by: BIOMD0000000616. To cite BioModels Database, please use: BioModels Database: An enhanced, curated and annotated resource for published quantitative kinetic models. To the extent possible under law, all copyright and related or neighbouring rights to this encoded model have been dedicated to the public domain worldwide. Please refer to CC0 Public Domain Dedication for more information.

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CD36 deficiency causes intestinal extracellular matrix disruption and chronic neutrophil

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