151. Colonic Pro-inflammatory Macrophages Cause Insulin Resistance in an Intestinal Ccl2/Ccr2-Dependent Manner
- Author
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Masafumi Onodera, Tetsuhiro Kikuchi, Sanshiro Tateya, Yoshinaga Kawano, Takaya Abe, Nobuyuki Watanabe, Hiroshi Itoh, Yoshikazu Tamori, Jun Nakae, and Mari Kaneko
- Subjects
0301 basic medicine ,medicine.medical_specialty ,CCR2 ,Chemokine ,Colon ,Inflammasomes ,Receptors, CCR2 ,Physiology ,medicine.medical_treatment ,Adipose tissue ,Inflammation ,CCL2 ,Diet, High-Fat ,Permeability ,03 medical and health sciences ,Insulin resistance ,Internal medicine ,medicine ,Animals ,Insulin ,Molecular Biology ,Chemokine CCL2 ,Mice, Knockout ,Intestinal permeability ,biology ,Macrophages ,Epithelial Cells ,Cell Biology ,medicine.disease ,Gastrointestinal Microbiome ,Mice, Inbred C57BL ,030104 developmental biology ,Endocrinology ,Adipose Tissue ,Organ Specificity ,biology.protein ,Insulin Resistance ,medicine.symptom ,Gene Deletion - Abstract
High-fat diet (HFD) induces low-grade chronic inflammation and insulin resistance. However, little is known about the mechanism underlying HFD-induced chronic inflammation in peripheral insulin-responsive tissues. Here, we show that colonic pro-inflammatory macrophages regulate insulin sensitivity under HFD conditions. To investigate the pathophysiological role of colonic macrophages, we generated macrophage-specific chemokine (C-C Motif) receptor 2 (Ccr2) knockout (M-Ccr2KO) and intestinal epithelial cell-specific tamoxifen-inducible Ccl2 knockout (Vil-Ccl2KO) mice. Both strains exhibited similar body weight to control under HFD. However, they exhibited decreased infiltration of colonic pro-inflammatory macrophages, decreased intestinal permeability, and inactivation of the colonic inflammasome. Interestingly, they showed significantly improved glucose tolerance and insulin sensitivity with decreased chronic inflammation of adipose tissue. Therefore, inhibition of pro-inflammatory macrophage infiltration prevents HFD-induced insulin resistance and could be a novel therapeutic approach for type 2 diabetes.
- Published
- 2016