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Effects of interactions between intestinal microbiota and intestinal macrophages on health.

TLDR
The possibility that intestinal microbiota influence health through the function of intestinal macrophages is discussed, suggesting that the host's immune response to intestinal microbiota may be etiologically-linked to these diseases; however, the mechanisms are poorly understood.
Abstract
Macrophages reside in every tissue of the body and play an important role in maintaining homeostasis. The intestinal mucosa is the largest immune organ and harbors macrophages in abundance. Dysfunction of intestinal macrophages is characteristic of patients with certain inflammatory bowel diseases. Although intestinal macrophages exhibit hyporesponsiveness to foreign substances, including various bacterial products, their physiological functions are unknown, but may be related to the contribution of intestinal bacteria to the maintenance of various physiological functions of the host. Moreover, recent reports suggest that there are associations between intestinal microbiota and the onset of pathologies, such as diverse metabolic syndromes, depression, and cancer. Evidence indicates that the host's immune response to intestinal microbiota may be etiologically-linked to these diseases; however, the mechanisms are poorly understood. In the present review, we discuss the possibility that intestinal microbiota influence health through the function of intestinal macrophages.

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Citations
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Alterations of lung microbiota in a mouse model of LPS-induced lung injury

TL;DR: It is concluded that the morbid transformation of ALI microbiota was attributed to the set of inborn opportunistic pathogens thriving in the environment of inflamed lung, rather than the external infectious agents.
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The malignant role of exosomes in the communication among colorectal cancer cell, macrophage and microbiome.

TL;DR: The innovative role of exosomes in the pathogenesis of CRC is highlighted and theoretical elaboration of the underlying mechanism provides valuable treating targets of CRC.
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The Macrophages-Microbiota Interplay in Colorectal Cancer (CRC)-Related Inflammation: Prognostic and Therapeutic Significance.

TL;DR: The current understanding of the molecular circuits underlying the interplay between macrophages and microbiota in CRC development, progression, and response to both conventional therapies and immunotherapies is discussed.
References
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Metabolic endotoxemia initiates obesity and insulin resistance

TL;DR: It is concluded that the LPS/CD14 system sets the tone of insulin sensitivity and the onset of diabetes and obesity and lowering plasma LPS concentration could be a potent strategy for the control of metabolic diseases.
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Changes in gut microbiota control metabolic endotoxemia-induced inflammation in high-fat diet-induced obesity and diabetes in mice

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Interleukin 10(IL-10) inhibits cytokine synthesis by human monocytes: an autoregulatory role of IL-10 produced by monocytes.

TL;DR: The results indicate that IL-10 has important regulatory effects on immunological and inflammatory responses because of its capacity to downregulate class II MHC expression and to inhibit the production of proinflammatory cytokines by monocytes.
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Interleukin-12 and the regulation of innate resistance and adaptive immunity

TL;DR: The understanding of the relative roles of IL-12 and other factors in TH1-type maturation of both CD4+ and CD8+ T cells is discussed here, including the participation in this process ofIL-23 and IL-27, two recently discovered members of the new family of heterodimeric cytokines.
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TLR4 links innate immunity and fatty acid–induced insulin resistance

TL;DR: It is suggested that TLR4 is a molecular link among nutrition, lipids, and inflammation and that the innate immune system participates in the regulation of energy balance and insulin resistance in response to changes in the nutritional environment.
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