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      (−)-Epigallocatechin Gallate Targets Notch to Attenuate the Inflammatory Response in the Immediate Early Stage in Human Macrophages

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          Abstract

          Inflammation plays important roles at different stages of diabetes mellitus, tumorigenesis, and cardiovascular diseases. (−)-Epigallocatechin gallate (EGCG) can attenuate inflammatory responses effectively. However, the immediate early mechanism of EGCG in inflammation remains unclear. Here, we showed that EGCG attenuated the inflammatory response in the immediate early stage of EGCG treatment by shutting off Notch signaling and that the effect did not involve the 67-kDa laminin receptor, the common receptor for EGCG. EGCG eliminated mature Notch from the cell membrane and the nuclear Notch intercellular domain, the active form of Notch, within 2 min by rapid degradation via the proteasome pathway. Transcription of the Notch target gene was downregulated simultaneously. Knockdown of Notch 1/2 expression by RNA interference impaired the downregulation of the inflammatory response elicited by EGCG. Further study showed that EGCG inhibited lipopolysaccharide-induced inflammation and turned off Notch signaling in human primary macrophages. Taken together, our results show that EGCG targets Notch to regulate the inflammatory response in the immediate early stage.

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          Most cited references 27

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          The canonical Notch signaling pathway: unfolding the activation mechanism.

          Notch signaling regulates many aspects of metazoan development and tissue renewal. Accordingly, the misregulation or loss of Notch signaling underlies a wide range of human disorders, from developmental syndromes to adult-onset diseases and cancer. Notch signaling is remarkably robust in most tissues even though each Notch molecule is irreversibly activated by proteolysis and signals only once without amplification by secondary messenger cascades. In this Review, we highlight recent studies in Notch signaling that reveal new molecular details about the regulation of ligand-mediated receptor activation, receptor proteolysis, and target selection.
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            Innate immune sensing and its roots: the story of endotoxin.

            How does the host sense pathogens? Our present concepts grew directly from longstanding efforts to understand infectious disease: how microbes harm the host, what molecules are sensed and, ultimately, the nature of the receptors that the host uses. The discovery of the host sensors--the Toll-like receptors--was rooted in chemical, biological and genetic analyses that centred on a bacterial poison, termed endotoxin.
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              Anti-inflammatory therapy in chronic disease: challenges and opportunities.

              A number of widespread and devastating chronic diseases, including atherosclerosis, type 2 diabetes, and Alzheimer's disease, have a pathophysiologically important inflammatory component. In these diseases, the precise identity of the inflammatory stimulus is often unknown and, if known, is difficult to remove. Thus, there is interest in therapeutically targeting the inflammatory response. Although there has been success with anti-inflammatory therapy in chronic diseases triggered by primary inflammation dysregulation or autoimmunity, there are considerable limitations. In particular, the inflammatory response is critical for survival. As a result, redundancy, compensatory pathways, and necessity narrow the risk:benefit ratio of anti-inflammatory drugs. However, new advances in understanding inflammatory signaling and its links to resolution pathways, together with new drug development, offer promise in this area of translational biomedical research.
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                Author and article information

                Contributors
                Journal
                Front Immunol
                Front Immunol
                Front. Immunol.
                Frontiers in Immunology
                Frontiers Media S.A.
                1664-3224
                10 April 2017
                2017
                : 8
                Affiliations
                1College of Life Science, Jilin University , Changchun, China
                2Key Laboratory of Pu-er Tea Science, Ministry of Education, Yunnan Agricultural University , Kunming, China
                3State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan , Kunming, China
                4Pu’er Institute of Pu-erh Tea, Pu’er , Yunnan, China
                Author notes

                Edited by: Jixin Zhong, Case Western Reserve University, USA

                Reviewed by: Yanlin He, Baylor College of Medicine, USA; Xuhui Feng, Indiana University, USA; Yonglin Chen, Yale University, USA; Penghua Yang, University of Maryland School of Medicine, USA

                *Correspondence: Shumei Hao, haosm@ 123456sina.com ; Xuanjun Wang, wangxuanjun@ 123456gmail.com ; Jun Sheng, shengj@ 123456ynau.edu.cn

                Specialty section: This article was submitted to Inflammation, a section of the journal Frontiers in Immunology

                Article
                10.3389/fimmu.2017.00433
                5385462
                Copyright © 2017 Wang, Xiang, Wang, Li, Fang, Song, Li, Yu, Wang, Yan, Hao, Wang and Sheng.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                Page count
                Figures: 6, Tables: 0, Equations: 0, References: 38, Pages: 21, Words: 7595
                Funding
                Funded by: National Natural Science Foundation of China 10.13039/501100001809
                Award ID: 31460392
                Categories
                Immunology
                Original Research

                Immunology

                inflammation, (−)-epigallocatechin gallate, notch, macrophages, laminin receptor

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