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Nauman M, Varshney S, Choi J, Augenlicht LH, Stanley P. EOGT enables residual Notch signaling in mouse intestinal cells lacking POFUT1. Sci Rep 2023; 13:17473. [PMID: 37838775 PMCID: PMC10576774 DOI: 10.1038/s41598-023-44509-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 10/09/2023] [Indexed: 10/16/2023] Open
Abstract
Notch signaling determines cell fates in mouse intestine. Notch receptors contain multiple epidermal growth factor-like (EGF) repeats modified by O-glycans that regulate Notch signaling. Conditional deletion of protein O-fucosyltransferase 1 (Pofut1) substantially reduces Notch signaling and markedly perturbs lineage development in mouse intestine. However, mice with inactivated Pofut1 are viable, whereas complete elimination of Notch signaling in intestine is lethal. Here we investigate whether residual Notch signaling enabled by EGF-domain-specific O-linked N-acetylglucosamine transferase (Eogt) permits mice conditionally lacking Pofut1 in intestine to survive. Mice globally lacking Eogt alone were grossly unaffected in intestinal development. In contrast, mice lacking both Eogt and Pofut1 died at ~ 28 days after birth with greater loss of body weight, a greater increase in the number of goblet and Paneth cells, and greater downregulation of the Notch target gene Hes1, compared to Pofut1 deletion alone. These data reveal that both O-fucose and O-GlcNAc glycans are fundamental to Notch signaling in the intestine and provide new insights into roles for O-glycans in regulating Notch ligand binding. Finally, EOGT and O-GlcNAc glycans provide residual Notch signaling and support viability in mice lacking Pofut1 in the intestine.
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Affiliation(s)
- Mohd Nauman
- Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave., New York, NY, 10641, USA
| | - Shweta Varshney
- Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave., New York, NY, 10641, USA
- Dudnyk, 5 Walnut Grove Drive, Suite 300, Horsham, PA, 19044, USA
| | - Jiahn Choi
- Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave., New York, NY, 10641, USA
| | - Leonard H Augenlicht
- Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave., New York, NY, 10641, USA
| | - Pamela Stanley
- Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave., New York, NY, 10641, USA.
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2
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Wang J, Yan Y, Si H, Li J, Zhao Y, Gao T, Pi J, Zhang R, Chen R, Chen W, Zheng Y, Jiang M. The effect of real-ambient PM2.5 exposure on the lung and gut microbiomes and the regulation of Nrf2. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 254:114702. [PMID: 36950983 DOI: 10.1016/j.ecoenv.2023.114702] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 02/20/2023] [Accepted: 02/26/2023] [Indexed: 06/18/2023]
Abstract
The influence of air pollution on human health has sparked widespread concerns across the world. Previously, we found that exposure to ambient fine particulate matter (PM2.5) in our "real-ambient exposure" system can result in reduced lung function. However, the mechanism of organ-specific toxicity is still not fully elucidated. The balance of the microbiome contributes to maintaining lung and gut health, but the changes in the microbiome under PM2.5 exposure are not fully understood. Recently, crosstalk between nuclear factor E2-related factor 2 (Nrf2) and the microbiome was reported. However, it is unclear whether Nrf2 affects the lung and gut microbiomes under PM2.5 exposure. In this study, wild-type (WT) and Nrf2-/- (KO) mice were exposed to filtered air (FA) and real ambient PM2.5 (PM) in the " real-ambient exposure" system to examine changes in the lung and gut microbiomes. Here, our data suggested microbiome dysbiosis in lung and gut of KO mice under PM2.5 exposure, and Nrf2 ameliorated the microbiome disorder. Our study demonstrated the detrimental impacts of PM2.5 on the lung and gut microbiome by inhaled exposure to air pollution and supported the protective role of Nrf2 in maintaining microbiome homeostasis under PM2.5 exposure.
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Affiliation(s)
- Jianxin Wang
- School of Public Health, Qingdao University, Qingdao, China
| | - Yongwei Yan
- Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture and Rural Affairs, Yellow Sea fisheries research institute, Chinese Academy of Fishery Sciences, Qingdao, Shandong, China
| | - Honglin Si
- School of Public Health, Qingdao University, Qingdao, China
| | - Jianyu Li
- School of Public Health, Qingdao University, Qingdao, China
| | - Yanjie Zhao
- School of Public Health, Qingdao University, Qingdao, China
| | - Tianlin Gao
- School of Public Health, Qingdao University, Qingdao, China
| | - Jingbo Pi
- School of Public Health, China Medical University, Shenyang, China
| | - Rong Zhang
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang, China
| | - Rui Chen
- School of Public Health, Capital Medical University, Beijing, China
| | - Wen Chen
- Department of Toxicology, School of Public Health, Sun Yaseen University, Guangzhou, China
| | - Yuxin Zheng
- School of Public Health, Qingdao University, Qingdao, China
| | - Menghui Jiang
- School of Public Health, Qingdao University, Qingdao, China.
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3
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Jin S, Zhu T, Deng S, Li D, Li J, Liu X, Liu Y. Dioscin ameliorates cisplatin-induced intestinal toxicity by mitigating oxidative stress and inflammation. Int Immunopharmacol 2022; 111:109111. [PMID: 35933746 DOI: 10.1016/j.intimp.2022.109111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 07/18/2022] [Accepted: 07/27/2022] [Indexed: 02/03/2023]
Abstract
Cisplatin is the most widely prescribed drug in chemotherapy, but its gastrointestinal toxicity reduces therapeutic efficacy. Oxidative stress and inflammation are considered to be the main pathogenesis of cisplatin-induced intestinal toxicity. Dioscin is a steroidal saponin with potential anti-cancer, antioxidant, and anti-inflammatory activities. In this study, we established a rat model of intestinal injury by tail vein injection of cisplatin, and intragastrically administered dioscin to evaluate its effect on intestinal injury. Biochemical markers, western blotting, qRT-PCR and histopathological staining were used to analyze intestinal injury according to various molecular mechanisms. The results revealed that dioscin significantly inhibited cisplatin-induced intestinal mucosal damage and decreased DAO levels in rats. Furthermore, dioscin activated the Nrf2/HO-1 pathway to increase the level of antioxidant enzymes and reduce the levels of MDA and H2O2. In addition, dioscin pretreatment significantly reduced ileum epithelial NLRP3 inflammasome formation and decreased the levels of inflammatory factors compared with the cisplatin group. In parallel, Nrf2 inhibitor ML385 blocked the therapeutic effect of dioscin in rat with cisplatin-induced intestinal toxicity. In terms of mechanisms, dioscin reversed cisplatin-induced up-regulation of MAPKs and up-regulated p-PI3K and p-AKT levels. Meanwhile, dioscin potently promoted Wnt3A/β-catenin signaling to relieve cisplatin-induced proliferation inhibition. In conclusion, our study suggests that dioscin could ameliorate the cisplatin-induced intestinal toxicity by reducing oxidative stress and inflammation.
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Affiliation(s)
- Shengzi Jin
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China.
| | - Tingting Zhu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China.
| | - Shouxiang Deng
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China.
| | - Ding Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China.
| | - Jie Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China.
| | - Xingyao Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China.
| | - Yun Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China; Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, Northeast Agricultural University, Harbin 150030, PR China.
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4
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Glycans that regulate Notch signaling in the intestine. Biochem Soc Trans 2022; 50:689-701. [PMID: 35311893 PMCID: PMC9370068 DOI: 10.1042/bst20200782] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/23/2022] [Accepted: 03/07/2022] [Indexed: 12/12/2022]
Abstract
Intestinal homeostasis is key to the maintenance of good health. The small intestine plays important roles in absorption, digestion, hormonal and immune functions. Crypt base columnar (CBC) stem cells residing at the bottom of crypts are nurtured by Paneth cells, and together create the stem cell niche, the foundation of intestinal homeostasis. CBC stem cells replicate to replenish their number, or differentiate into a variety of epithelial cells with specialized functions. Notch signaling is a cell-cell signaling pathway that regulates both the proliferation and differentiation of CBC stem cells. NOTCH1 and NOTCH2 stimulated by canonical Notch ligands DLL1 and DLL4 mediate Notch signaling in the intestine that, in concert with other signaling pathways including the WNT and BMP pathways, determines cell fates. Importantly, interactions between Notch receptors and canonical Notch ligands are regulated by O-glycans linked to Ser/Thr in epidermal growth factor-like (EGF) repeats of the Notch receptor extracellular domain (NECD). The O-glycans attached to NECD are key regulators of the strength of Notch signaling. Imbalances in Notch signaling result in altered cell fate decisions and may lead to cancer in the intestine. In this review, we summarize the impacts of mutations in Notch pathway members on intestinal development and homeostasis, with a focus on the glycosyltransferases that transfer O-glycans to EGF repeats of NOTCH1, NOTCH2, DLL1 and DLL4.
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5
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Dai L, Jie S, Bi S, Qing Q, Chen J, Le Wang. Angiopoietin-2 silence alleviates lipopolysaccharide-induced inflammation, barrier dysfunction and endoplasmic reticulum stress of intestinal epithelial cells by blocking Notch signaling pathway. Bioengineered 2021; 12:8116-8124. [PMID: 34565297 PMCID: PMC8806784 DOI: 10.1080/21655979.2021.1985341] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Necrotizing enterocolitis, a devastating gastrointestinal disease with high mortality, poses great threats to global health. Therefore, we conducted this study to explore the role of ANGPT2, as well as the potential mechanism, in necrotizing enterocolitis. IEC-6 cells were stimulated with lipopolysaccharide (LPS) to induce necrotizing enterocolitis model in vitro. The expression of ANGPT2 was measured by RT-qPCR. The cell viability was detected using CCK-8. Besides, the expressions of endoplasmic reticulum (ER) stress-related proteins, Notch signaling pathway-related proteins and tight junction proteins were checked by western blot. The apoptosis and inflammatory response were detected by TUNEL and ELISA, respectively. Moreover, with the adoption of TEER, the cell monolayer permeability was detected. The results showed that ANGPT2 expression was greatly increased after LPS induction. In addition, ANGPT2 knockdown significantly decreased the apoptosis, inflammatory response, barrier dysfunction and endoplasmic reticulum stress of LPS-induced IEC-6 cells. What is more, ANGPT2 knockdown could block Notch signaling pathway. Additionally, with the treatment of Jagged-1, the protective effect of ANGPT2 knockdown on LPS-induced intestinal injury was partly abolished. To sum up, silencing ANGPT2 could improve LPS-induced inflammation, barrier dysfunction and ER stress of intestinal epithelial cells via blocking Notch signaling pathway.
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Affiliation(s)
- Liying Dai
- Neonatology Department, Anhui Provincial Children's Hospital, Hefei, China
| | - Shuangshuang Jie
- Neonatology Department, Anhui Provincial Children's Hospital, Hefei, China
| | - Shaohua Bi
- Neonatology Department, Anhui Provincial Children's Hospital, Hefei, China
| | - Qing Qing
- Neonatology Department, Anhui Provincial Children's Hospital, Hefei, China
| | - Jun Chen
- Neonatology Department, Anhui Provincial Children's Hospital, Hefei, China
| | - Le Wang
- Neonatology Department, Anhui Provincial Children's Hospital, Hefei, China
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6
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Li Q, Wang J, Ma X, Wang M, Zhou L. POFUT1 acts as a tumor promoter in glioblastoma by enhancing the activation of Notch signaling. J Bioenerg Biomembr 2021; 53:621-632. [PMID: 34251584 DOI: 10.1007/s10863-021-09912-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 07/05/2021] [Indexed: 01/13/2023]
Abstract
Dysregulation of protein O-fucosyl transferase 1 (POFUT1) contributes to the occurrence and progression of multiple cancers. However, whether POFUT1 has a relationship with the pathogenesis of glioblastoma (GBM) is unknown. This work was aimed at evaluating the detailed relevance of POFUT1 in GBM. Here, we demonstrated high levels of POFUT1 in GBM tissue and elucidated that GBM patients with high levels of POFUT1 had a shorter survival rate than those with low levels of POFUT1. POFUT1 knockdown in GBM cells markedly downregulated the ability to proliferate and invade, while overexpression of POFUT1 potentiated the proliferative and invasive ability of GBM cells. Further mechanistic studies indicated that silencing POFUT1 prohibited the activation of Notch signaling, leading to a reduction in the expression of HES1 and HEY1. On the contrary, overexpression of POFUT1 enhanced the activation of Notch signaling. Notably, inhibition of Notch signaling markedly reversed POFUT1-overexpression-induced tumor promotion effects in GBM cells. In addition, POFUT1 silencing markedly repressed the potential of GBM cells to form tumors in vivo. In conclusion, the data of this work indicates that POFUT1 serves a tumor promotion role in GBM by enhancing the activation of Notch signaling. This study underlines the potential role of the POFUT1/Notch axis in GBM progression and proposes POFUT1 as a promising anticancer target for GBM.
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Affiliation(s)
- Qi Li
- Department of Neurosurgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
| | - Jia Wang
- Department of Neurosurgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
| | - Xudong Ma
- Department of Neurosurgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
| | - Maode Wang
- Department of Neurosurgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
| | - Lei Zhou
- Department of Ultrasonography, Xi'an People's Hospital (Xi'an Fourth Hospital), No. 21 Jiefang Road, Xi'an, 710004, Shaanxi, China.
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Fang J, Wang H, Xue Z, Cheng Y, Zhang X. PPARγ: The Central Mucus Barrier Coordinator in Ulcerative Colitis. Inflamm Bowel Dis 2021; 27:732-741. [PMID: 33772551 DOI: 10.1093/ibd/izaa273] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Indexed: 12/16/2022]
Abstract
Ulcerative colitis (UC) is an idiopathic, long-term inflammatory disorder of the colon, characterized by a continuous remitting and relapsing course. The intestinal mucus barrier is the first line at the interface between the host and microbiota and acts to protect intestinal epithelial cells from invasion. Data from patients and animal studies have shown that an impaired mucus barrier is closely related to the severity of UC. Depletion of the mucus barrier is not just the strongest but is also the only independent risk factor predicting relapse in patients with UC. Peroxisome proliferator-activated receptor gamma (PPARγ), a nuclear transcription regulator, is involved in the regulation of inflammatory cytokine expression. It is also known to promote mucus secretion under pathological conditions to expel pathogenic bacteria or toxins. More important, PPARγ has been shown to affect host-microbiota interactions by modulating the energy metabolism of colonocytes and the oxygen availability of the intestinal microbiome. It is well known that gut microbiota homeostasis is essential for butyrate generation by the commensal bacteria to supply energy resources for colonocytes. Therefore, it can be speculated that PPARγ, as a central coordinator of the mucus barrier, may be a promising target for the development of effective agents to combat UC.
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Affiliation(s)
- Jian Fang
- Department of Preventive Medicine, Zhejiang Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang Province, People's Republic of China.,College of Medicine, Shaoxing University, Shaoxing, Zhejiang Province, People's Republic of China
| | - Hui Wang
- Department of Colorectal Surgery, Shaoxing People's Hospital, Shaoxing, Zhejiang Province, People's Republic of China
| | - Zhe Xue
- Department of Preventive Medicine, Zhejiang Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang Province, People's Republic of China
| | - Yinyin Cheng
- Department of Preventive Medicine, Zhejiang Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang Province, People's Republic of China
| | - Xiaohong Zhang
- Department of Preventive Medicine, Zhejiang Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang Province, People's Republic of China
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8
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Pu Y, Song Y, Zhang M, Long C, Li J, Wang Y, Xu Y, Pan F, Zhao N, Zhang X, Xu Y, Cui J, Wang H, Li Y, Zhao Y, Jin D, Zhang H. GOLM1 restricts colitis and colon tumorigenesis by ensuring Notch signaling equilibrium in intestinal homeostasis. Signal Transduct Target Ther 2021; 6:148. [PMID: 33850109 PMCID: PMC8044123 DOI: 10.1038/s41392-021-00535-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 01/25/2021] [Accepted: 02/06/2021] [Indexed: 02/02/2023] Open
Abstract
Intestinal epithelium serves as the first barrier against the infections and injuries that mediate colonic inflammation. Colorectal cancer is often accompanied with chronic inflammation. Differed from its well-known oncogenic role in many malignancies, we present here that Golgi membrane protein 1 (GOLM1, also referred to as GP73) suppresses colorectal tumorigenesis via maintenance of intestinal epithelial barrier. GOLM1 deficiency in mice conferred susceptibility to mucosal inflammation and colitis-induced epithelial damage, which consequently promoted colon cancer. Mechanistically, depletion of GOLM1 in intestinal epithelial cells (IECs) led to aberrant Notch activation that interfered with IEC differentiation, maturation, and lineage commitment in mice. Pharmacological inhibition of Notch pathway alleviated epithelial lesions and restrained pro-tumorigenic inflammation in GOLM1-deficient mice. Therefore, GOLM1 maintains IEC homeostasis and protects against colitis and colon tumorigenesis by modulating the equilibrium of Notch signaling pathway.
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Affiliation(s)
- Yang Pu
- grid.506261.60000 0001 0706 7839State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences and School of Basic Medicine, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Ya Song
- grid.506261.60000 0001 0706 7839State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences and School of Basic Medicine, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China ,grid.411971.b0000 0000 9558 1426Institute of Cancer Stem Cell, Dalian Medical University, Dalian, Liaoning China
| | - Mengdi Zhang
- grid.506261.60000 0001 0706 7839State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences and School of Basic Medicine, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Caifeng Long
- grid.506261.60000 0001 0706 7839State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences and School of Basic Medicine, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Jie Li
- grid.506261.60000 0001 0706 7839State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences and School of Basic Medicine, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Yanan Wang
- grid.506261.60000 0001 0706 7839State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences and School of Basic Medicine, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Yinzhe Xu
- grid.414252.40000 0004 1761 8894Chinese PLA General Hospital, Beijing, China
| | - Fei Pan
- grid.414252.40000 0004 1761 8894Chinese PLA General Hospital, Beijing, China
| | - Na Zhao
- grid.506261.60000 0001 0706 7839State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences and School of Basic Medicine, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Xinyu Zhang
- grid.506261.60000 0001 0706 7839State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences and School of Basic Medicine, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Yanan Xu
- grid.458458.00000 0004 1792 6416State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Jianxin Cui
- grid.414252.40000 0004 1761 8894Chinese PLA General Hospital, Beijing, China
| | - Hongying Wang
- grid.506261.60000 0001 0706 7839State Key Laboratory of Molecular Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yan Li
- grid.16821.3c0000 0004 0368 8293Department of Anatomy and Physiology, College of Basic Medical Sciences, Shanghai Jiao Tong University, Shanghai, China
| | - Yong Zhao
- grid.458458.00000 0004 1792 6416State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Di Jin
- grid.411971.b0000 0000 9558 1426Institute of Cancer Stem Cell, Dalian Medical University, Dalian, Liaoning China
| | - Hongbing Zhang
- grid.506261.60000 0001 0706 7839State Key Laboratory of Medical Molecular Biology, Department of Physiology, Institute of Basic Medical Sciences and School of Basic Medicine, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
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9
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Olivier S, Pochard C, Diounou H, Castillo V, Divoux J, Alcantara J, Leclerc J, Guilmeau S, Huet C, Charifi W, Varin TV, Daniel N, Foretz M, Neunlist M, Salomon BL, Ghosh P, Marette A, Rolli-Derkinderen M, Viollet B. Deletion of intestinal epithelial AMP-activated protein kinase alters distal colon permeability but not glucose homeostasis. Mol Metab 2021; 47:101183. [PMID: 33548500 PMCID: PMC7921883 DOI: 10.1016/j.molmet.2021.101183] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 01/21/2021] [Accepted: 02/01/2021] [Indexed: 12/11/2022] Open
Abstract
Objective The intestinal epithelial barrier (IEB) restricts the passage of microbes and potentially harmful substances from the lumen through the paracellular space, and rupture of its integrity is associated with a variety of gastrointestinal disorders and extra-digestive diseases. Increased IEB permeability has been linked to disruption of metabolic homeostasis leading to obesity and type 2 diabetes. Interestingly, recent studies have uncovered compelling evidence that the AMP-activated protein kinase (AMPK) signaling pathway plays an important role in maintaining epithelial cell barrier function. However, our understanding of the function of intestinal AMPK in regulating IEB and glucose homeostasis remains sparse. Methods We generated mice lacking the two α1 and α2 AMPK catalytic subunits specifically in intestinal epithelial cells (IEC AMPK KO) and determined the physiological consequences of intestinal-specific deletion of AMPK in response to high-fat diet (HFD)-induced obesity. We combined histological, functional, and integrative analyses to ascertain the effects of gut AMPK loss on intestinal permeability in vivo and ex vivo and on the development of obesity and metabolic dysfunction. We also determined the impact of intestinal AMPK deletion in an inducible mouse model (i-IEC AMPK KO) by measuring IEB function, glucose homeostasis, and the composition of gut microbiota via fecal 16S rRNA sequencing. Results While there were no differences in in vivo intestinal permeability in WT and IEC AMPK KO mice, ex vivo transcellular and paracellular permeability measured in Ussing chambers was significantly increased in the distal colon of IEC AMPK KO mice. This was associated with a reduction in pSer425 GIV phosphorylation, a marker of leaky gut barrier. However, the expression of tight junction proteins in intestinal epithelial cells and pro-inflammatory cytokines in the lamina propria were not different between genotypes. Although the HFD-fed AMPK KO mice displayed suppression of the stress polarity signaling pathway and a concomitant increase in colon permeability, loss of intestinal AMPK did not exacerbate body weight gain or adiposity. Deletion of AMPK was also not sufficient to alter glucose homeostasis or the acute glucose-lowering action of metformin in control diet (CD)- or HFD-fed mice. CD-fed i-IEC AMPK KO mice also presented higher permeability in the distal colon under homeostatic conditions but, surprisingly, this was not detected upon HFD feeding. Alteration in epithelial barrier function in the i-IEC AMPK KO mice was associated with a shift in the gut microbiota composition with higher levels of Clostridiales and Desulfovibrionales. Conclusions Altogether, our results revealed a significant role of intestinal AMPK in maintaining IEB integrity in the distal colon but not in regulating glucose homeostasis. Our data also highlight the complex interaction between gut microbiota and host AMPK. Deletion of intestinal AMPKα1 and α2 suppresses the stress-polarity signaling (SPS) pathway. Loss of the SPS pathway is associated with increased paracellular permeability in the distal colon. Intestinal AMPK is dispensable for the acute glucose-lowering action of metformin. Loss of intestinal AMPK alters the gut microbiota composition.
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Affiliation(s)
- Séverine Olivier
- Université de Paris, Institut Cochin, INSERM, CNRS, F-75014 Paris, France
| | - Camille Pochard
- University of Nantes, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Hanna Diounou
- Université de Paris, Institut Cochin, INSERM, CNRS, F-75014 Paris, France
| | - Vanessa Castillo
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Jordane Divoux
- Sorbonne Université, INSERM, CNRS, Centre d'Immunologie et des Maladies Infectieuses (CIMI), Paris, France
| | - Joshua Alcantara
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Jocelyne Leclerc
- Université de Paris, Institut Cochin, INSERM, CNRS, F-75014 Paris, France
| | - Sandra Guilmeau
- Université de Paris, Institut Cochin, INSERM, CNRS, F-75014 Paris, France
| | - Camille Huet
- Université de Paris, Institut Cochin, INSERM, CNRS, F-75014 Paris, France
| | - Wafa Charifi
- Université de Paris, Institut Cochin, INSERM, CNRS, F-75014 Paris, France
| | - Thibault V Varin
- Québec Heart and Lung Research Institute (IUCPQ) & Institute for Nutrition and Functional Foods (INAF), Laval University Québec, Québec, Canada
| | - Noëmie Daniel
- Québec Heart and Lung Research Institute (IUCPQ) & Institute for Nutrition and Functional Foods (INAF), Laval University Québec, Québec, Canada
| | - Marc Foretz
- Université de Paris, Institut Cochin, INSERM, CNRS, F-75014 Paris, France
| | - Michel Neunlist
- University of Nantes, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France
| | - Benoit L Salomon
- Sorbonne Université, INSERM, CNRS, Centre d'Immunologie et des Maladies Infectieuses (CIMI), Paris, France
| | - Pradipta Ghosh
- Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA 92093, USA; Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - André Marette
- Québec Heart and Lung Research Institute (IUCPQ) & Institute for Nutrition and Functional Foods (INAF), Laval University Québec, Québec, Canada
| | - Malvyne Rolli-Derkinderen
- University of Nantes, INSERM, TENS, The Enteric Nervous System in Gut and Brain Diseases, IMAD, Nantes, France.
| | - Benoit Viollet
- Université de Paris, Institut Cochin, INSERM, CNRS, F-75014 Paris, France.
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10
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Zhang S, Yang Q, Liu Z, Shi S. POFUT1 is dispensable for structure, function and survival of mouse podocytes. Am J Transl Res 2020; 12:2212-2224. [PMID: 32509213 PMCID: PMC7270003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 05/01/2020] [Indexed: 06/11/2023]
Abstract
Pofut1 gene encodes a O-fucosyltransferase that adds fucose to the serine/threonine residue in the sequence of C2XXXX(S/T)C3 of EGF-like domain in a protein. O-fucosylation has been shown to be required for some EGF-like domain-containing proteins to function, e.g., Notch1, and POFUT1 deficiency could affect cellular function and cause diseases. Pofut1 is ubiquitously expressed, but its essentiality for most cell types is not known. In the present study, we examined the consequence of Pofut1 gene abrogation in mouse podocytes using Cre-loxP system, and found that the conditional knockout mice were indistinguishable from wild-type controls in urinary protein level, glomerular morphology, podocyte foot process ultrastructure, podocyte marker expression and podocyte numbers. These results indicated that POFUT1 is not essential for podocyte structure, function and survival in mice. To understand why POFUT1 is dispensable for podocytes, we searched mouse podocyte essential gene candidates (as determined by single-cell RNA-seq) and found only two POFUT1 substrates, NOTCH2 and tPA. It has been shown that abrogation of these genes does not cause podocyte injury, explaining dispensability of POFUT1 for mouse podocytes and demonstrating a feasibility to predict POFUT1 essentiality for a given cell type. At present, most mouse cell types have been subject to single-cell RNA-seq, making essential gene prediction and thus POFUT1 requirement prediction possible for the cell types.
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Affiliation(s)
- Sipan Zhang
- National Clinical Research Center for Kidney Diseases, Jinling Hospital, Nanjing University School of MedicineNanjing, China
| | - Qianqian Yang
- National Clinical Research Center for Kidney Diseases, Jinling Hospital, Nanjing University School of MedicineNanjing, China
| | - Zhihong Liu
- National Clinical Research Center for Kidney Diseases, Jinling Hospital, Nanjing University School of MedicineNanjing, China
| | - Shaolin Shi
- National Clinical Research Center for Kidney Diseases, Jinling Hospital, Nanjing University School of MedicineNanjing, China
- Department of Medicine, Icahn School of Medicine at Mount SinaiUSA
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11
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Komor MA, de Wit M, van den Berg J, Martens de Kemp SR, Delis-van Diemen PM, Bolijn AS, Tijssen M, Schelfhorst T, Piersma SR, Chiasserini D, Sanders J, Rausch C, Hoogstrate Y, Stubbs AP, de Jong M, Jenster G, Carvalho B, Meijer GA, Jimenez CR, Fijneman RJA. Molecular characterization of colorectal adenomas reveals POFUT1 as a candidate driver of tumor progression. Int J Cancer 2019; 146:1979-1992. [PMID: 31411736 PMCID: PMC7027554 DOI: 10.1002/ijc.32627] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 07/11/2019] [Indexed: 12/11/2022]
Abstract
Removal of colorectal adenomas is an effective strategy to reduce colorectal cancer (CRC) mortality rates. However, as only a minority of adenomas progress to cancer, such strategies may lead to overtreatment. The present study aimed to characterize adenomas by in‐depth molecular profiling, to obtain insights into altered biology associated with the colorectal adenoma‐to‐carcinoma progression. We obtained low‐coverage whole genome sequencing, RNA sequencing and tandem mass spectrometry data for 30 CRCs, 30 adenomas and 18 normal adjacent colon samples. These data were used for DNA copy number aberrations profiling, differential expression, gene set enrichment and gene‐dosage effect analysis. Protein expression was independently validated by immunohistochemistry on tissue microarrays and in patient‐derived colorectal adenoma organoids. Stroma percentage was determined by digital image analysis of tissue sections. Twenty‐four out of 30 adenomas could be unambiguously classified as high risk (n = 9) or low risk (n = 15) of progressing to cancer, based on DNA copy number profiles. Biological processes more prevalent in high‐risk than low‐risk adenomas were related to proliferation, tumor microenvironment and Notch, Wnt, PI3K/AKT/mTOR and Hedgehog signaling, while metabolic processes and protein secretion were enriched in low‐risk adenomas. DNA copy number driven gene‐dosage effect in high‐risk adenomas and cancers was observed for POFUT1, RPRD1B and EIF6. Increased POFUT1 expression in high‐risk adenomas was validated in tissue samples and organoids. High POFUT1 expression was also associated with Notch signaling enrichment and with decreased goblet cells differentiation. In‐depth molecular characterization of colorectal adenomas revealed POFUT1 and Notch signaling as potential drivers of tumor progression. What's new? Removal of colorectal adenomas is an effective strategy to reduce colorectal cancer (CRC) mortality rates. However, as only a minority of adenomas progress to cancer, such strategies may lead to overtreatment. While high‐risk adenomas, defined by specific DNA copy number aberrations, have an increased risk of progression, the mechanisms underlying colorectal adenoma‐to‐carcinoma progression remain unclear. This molecular characterization of colorectal adenomas, CRCs, and normal adjacent colon samples demonstrates that biological processes inherent to CRC are already more active in high‐risk adenomas compared to low‐risk adenomas. Moreover, the findings highlight POFUT1 and Notch signaling as potential drivers of colorectal tumor development.
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Affiliation(s)
- Malgorzata A Komor
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands.,Oncoproteomics Laboratory, Amsterdam UMC, Vrije Universiteit Amsterdam, Medical Oncology, Amsterdam, The Netherlands
| | - Meike de Wit
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Jose van den Berg
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Sanne R Martens de Kemp
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands.,Oncoproteomics Laboratory, Amsterdam UMC, Vrije Universiteit Amsterdam, Medical Oncology, Amsterdam, The Netherlands
| | | | - Anne S Bolijn
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Marianne Tijssen
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Tim Schelfhorst
- Oncoproteomics Laboratory, Amsterdam UMC, Vrije Universiteit Amsterdam, Medical Oncology, Amsterdam, The Netherlands
| | - Sander R Piersma
- Oncoproteomics Laboratory, Amsterdam UMC, Vrije Universiteit Amsterdam, Medical Oncology, Amsterdam, The Netherlands
| | - Davide Chiasserini
- Oncoproteomics Laboratory, Amsterdam UMC, Vrije Universiteit Amsterdam, Medical Oncology, Amsterdam, The Netherlands
| | - Joyce Sanders
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Christian Rausch
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Youri Hoogstrate
- Department of Urology, Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Andrew P Stubbs
- Department of Bioinformatics, Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands
| | | | - Guido Jenster
- Department of Urology, Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Beatriz Carvalho
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Gerrit A Meijer
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Connie R Jimenez
- Oncoproteomics Laboratory, Amsterdam UMC, Vrije Universiteit Amsterdam, Medical Oncology, Amsterdam, The Netherlands
| | - Remond J A Fijneman
- Department of Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
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- See Appendix for consortium members
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12
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Li D, Lin C, Li N, Du Y, Yang C, Bai Y, Feng Z, Su C, Wu R, Song S, Yan P, Chen M, Jain A, Huang L, Zhang Y, Li X. PLAGL2 and POFUT1 are regulated by an evolutionarily conserved bidirectional promoter and are collaboratively involved in colorectal cancer by maintaining stemness. EBioMedicine 2019; 45:124-138. [PMID: 31279780 PMCID: PMC6642334 DOI: 10.1016/j.ebiom.2019.06.051] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/25/2019] [Accepted: 06/26/2019] [Indexed: 02/07/2023] Open
Abstract
Background Our previous study revealed that PLAGL2 or POFUT1 can promote tumorigenesis and maintain significant positive correlations in colorectal cancer (CRC). However, the mechanism leading to the co-expression and the underlying functional and biological implications remain unclear. Methods Clinical tumor tissues and TCGA dataset were utilized to analyze the co-expression of PLAGL2 and POFUT1. Luciferase reporter assays, specially made bidirectional promoter vectors and ectopic expression of 3’UTR were employed to study the mechanisms of co-expression. In vitro and in vivo assays were performed to further confirm the oncogenic function of both. The sphere formation assay, immunofluorescence, Western blot and qRT-PCR were performed to investigate the effect of both genes in colorectal cancer stem cells (CSCs). Findings PLAGL2 and POFUT1 maintained co-expression in CRC (r = 0.91, p < .0001). An evolutionarily conserved bidirectional promoter, rather than post-transcriptional regulation by competing endogenous RNAs, caused the co-expression of PLAGL2 and POFUT1 in CRC. The bidirectional gene pair PLAGL2/POFUT1 was subverted in CRC and acted synergistically to promote colorectal tumorigenesis by maintaining stemness of colorectal cancer stem cells through the Wnt and Notch pathways. Finally, PLAGL2 and POFUT1 share transcription factor binding sites, and introducing mutations into promoter regions with shared transcription regulatory elements led to a decrease in the PLAGL2/POFUT1 promoter activity in both directions. Interpretation Our team identified for the first time a bidirectional promoter pair oncogene, PLAGL2-POFUT1, in CRC. The two genes synergistically promote the progression of CRC and affect the characteristics of CSCs, which can offer promising intervention targets for clinicians and researchers. Fund National Nature Science Foundation of China, the Hunan province projects of Postgraduate Independent Exploration and Innovation of Central South University.
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Affiliation(s)
- Daojiang Li
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China; Department of Colorectal and Anal Surgery of Zhongnan Hospital of Wuhan University, Wuhan 430071, Hubei Province, China
| | - Changwei Lin
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Nanpeng Li
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Yuheng Du
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Chunxing Yang
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Yang Bai
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Zhicai Feng
- Department of Burns and Plastic Surgery, the 3rd Xiangya Hospital, Central South University, Changsha, Hunan 410013, China
| | - Chen Su
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Runliu Wu
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Shenglei Song
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Peicheng Yan
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Miao Chen
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Arad Jain
- College of Arts and Science, University of Virginia, Charlottesville, Virginia 22904, United States of America
| | - Lihua Huang
- Center for Experimental Medicine, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Yi Zhang
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China
| | - Xiaorong Li
- Department of gastroenterological surgery, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China; Center for Experimental Medicine, The Third XiangYa Hospital of Central South University, Changsha, Hunan 410013, China.
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13
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Varshney S, Stanley P. Multiple roles for O-glycans in Notch signalling. FEBS Lett 2018; 592:3819-3834. [PMID: 30207383 DOI: 10.1002/1873-3468.13251] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 09/05/2018] [Accepted: 09/06/2018] [Indexed: 12/12/2022]
Abstract
Notch signalling regulates a plethora of developmental processes and is also essential for the maintenance of tissue homeostasis in adults. Therefore, fine-tuning of Notch signalling strength needs to be tightly regulated. Of key importance for the regulation of Notch signalling are O-fucose, O-GlcNAc and O-glucose glycans attached to the extracellular domain of Notch receptors. The EGF repeats of the Notch receptor extracellular domain harbour consensus sites for addition of the different types of O-glycan to Ser or Thr, which takes place in the endoplasmic reticulum. Studies from Drosophila to mammals have demonstrated the multifaceted roles of O-glycosylation in regulating Notch signalling. O-glycosylation modulates different aspects of Notch signalling including recognition by Notch ligands, the strength of ligand binding, Notch receptor trafficking, stability and activation at the cell surface. Defects in O-glycosylation of Notch receptors give rise to pathologies in humans. This Review summarizes the nature of the O-glycans on Notch receptors and their differential effects on Notch signalling.
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Affiliation(s)
- Shweta Varshney
- Department of Cell Biology, Albert Einstein College of Medicine, New York, NY, USA
| | - Pamela Stanley
- Department of Cell Biology, Albert Einstein College of Medicine, New York, NY, USA
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14
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Du Y, Li D, Li N, Su C, Yang C, Lin C, Chen M, Wu R, Li X, Hu G. POFUT1 promotes colorectal cancer development through the activation of Notch1 signaling. Cell Death Dis 2018; 9:995. [PMID: 30250219 PMCID: PMC6155199 DOI: 10.1038/s41419-018-1055-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Revised: 09/08/2018] [Accepted: 09/10/2018] [Indexed: 12/12/2022]
Abstract
Copy number variations (CNVs) are key drivers of colorectal cancer (CRC). Our previous studies revealed that protein O-fucosyltransferase 1 (POFUT1) overexpression is driven by CNVs during CRC development. The potential role and underlying mechanisms of POFUT1 in CRC were not investigated. In this study, we analyzed the expression of POFUT1 in CRC from cosmic and TCGA databases and confirmed that POFUT1 is highly expressed in CRC. We used well characterized CRC cell lines, including SW620 and HCT116 to establish a model POFUT1 knockdown cell line. Using these cells, we investigated the role of POFUT1 in CRC. Our data revealed that silencing POFUT1 in CRC cells inhibits cell proliferation, decreases cell invasion and migration, arrests cell cycle progression, and stimulates CRC cell apoptosis in vitro. We further demonstrate that POFUT1 silencing dramatically suppresses CRC tumor growth and transplantation in vivo. We additionally reveal new mechanistic insights into the role of POFUT1 during CRC, through demonstrating that POFUT1 silencing inhibits Notch1 signaling. Taken together, our findings demonstrate that POFUT1 is a tumor activating gene during CRC development, which positively regulates CRC tumor progression through activating Notch1.
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Affiliation(s)
- Yuheng Du
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Daojiang Li
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Nanpeng Li
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Chen Su
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Chunxing Yang
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Changwei Lin
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Miao Chen
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Runliu Wu
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Xiaorong Li
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
| | - Gui Hu
- Department of Gastrointestinal Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China.
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15
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Guo XK, Ou J, Liang S, Zhou X, Hu X. Epithelial Hes1 maintains gut homeostasis by preventing microbial dysbiosis. Mucosal Immunol 2018; 11:716-726. [PMID: 29297498 DOI: 10.1038/mi.2017.111] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 11/12/2017] [Indexed: 02/04/2023]
Abstract
Recent advancements suggest that in addition to its roles in developmental processes, transcription repressor hairy and enhancer of split 1 (Hes1) also acts as a key regulator of inflammatory responses. A healthy gut microbiota ecology is critical for establishment of tissue homeostasis. However, the role of epithelial Hes1 in regulating intestinal microbiota ecology and intestinal homeostasis remains unexplored. Here we show that epithelial Hes1 deficiency leads to intestinal microbial dysbiosis and disturbed homeostasis. Both inducible Hes1 deletion and intestinal epithelial cell (IEC)-intrinsic Hes1 deletion resulted in loss of Bacteroidetes in ileum and increase of Escherichia coli and Akkermansia muciniphila in colon. Loss of Bacteroidetes closely correlated with decreased expression of commensal-dependent antimicrobial genes, leading to impaired resistance against pathogenic bacterial colonization. Moreover, Hes1 deficiency enhanced susceptibility to Dextran sodium sulphate-induced intestinal inflammation. Of note, transfer of Hes1-deficient-mouse-derived fecal microbiota promoted intestinal inflammation. The increase of A. muciniphila in colon was associated with Hes1-deficiency-induced unbalanced mucosal microhabitats. Thus, our results support that IEC-intrinsic Hes1 maintains gut homeostasis by preventing microbial dysbiosis partially through regulating mucosal microhabitats.
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Affiliation(s)
- X-K Guo
- Institute for Immunology and School of Medicine, Tsinghua University, Beijing, China.,Beijing Advanced Innovation Center for Food Nutrition and Human Health, China Agricultural University, Beijing, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
| | - J Ou
- Institute for Immunology and School of Medicine, Tsinghua University, Beijing, China
| | - S Liang
- Institute for Immunology and School of Medicine, Tsinghua University, Beijing, China
| | - X Zhou
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, China Agricultural University, Beijing, China.,College of Plant Protection, China Agricultural University, Beijing, China
| | - X Hu
- Institute for Immunology and School of Medicine, Tsinghua University, Beijing, China.,Collaborative Innovation Center for Biotherapy, Tsinghua University, Beijing, China
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16
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Yang L, Wang Y, Fang M, Deng D, Zhang Y. C3orf21 ablation promotes the proliferation of lung adenocarcinoma, and its mutation at the rs2131877 locus may serve as a susceptibility marker. Oncotarget 2018; 8:33422-33431. [PMID: 28422717 PMCID: PMC5464879 DOI: 10.18632/oncotarget.16798] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 03/24/2017] [Indexed: 11/25/2022] Open
Abstract
In this study, we investigated the role of C3orf21 gene polymorphism at the rs2131877 locus and its contribution to lung adenocarcinoma pathogenesis. Normal lung and tumor tissue sections were collected from fifteen patients with lung adenocarcinoma for chromosome 3 open reading frame 21 (C3orf21) genotype analysis. In addition, a retrospective analysis was performed to assess the association between C3orf21 genotype and tumor markers from patient samples used in our previously published study. In parallel, we also manipulated C3orf21 gene expression either by overexpressing or ablating it in a MSTO-211H human lung cancer cell line to further understand its contribution to cell proliferation, apoptosis and migration. Our results indicated that the patients with smoking history had a significantly increased mutation (rs2131877 T/C+C/C genotype) rate (p = 0.025), in addition to higher values for the CYF211 and NSE tumor markers (p = 0.014 and p = 0.031, respectively). The retrospective analysis also confirmed that the NSE marker value was higher in patients with a C3orf21 rs2131877 T/C+C/C genotype. Furthermore, our in vitro data indicated that C3orf21 ablation promoted lung cancer cell proliferation, inhibited apoptosis and accelerated cell migration. Overall, our study concluded that C30rf21 rs 2131877 T/C+C/C genotype patients may experience increased nicotine addiction and that C30rf21 can likely serve as a susceptibility marker for lung adenocarcinoma with a higher degree of malignancy.
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Affiliation(s)
- Litao Yang
- Department of Abdominal Surgery, Zhejiang Cancer Hospital, Hangzhou, China
| | - Ying Wang
- Department of Basic Medical Science, Zhejiang Chinese Medical University, Hangzhou, China
| | - Meiyu Fang
- Department of Integration of Traditional Chinese and Western Medicine, Zhejiang Cancer Hospital, Hangzhou, China
| | - Douhou Deng
- Department of Integration of Traditional Chinese and Western Medicine, Zhejiang Cancer Hospital, Hangzhou, China
| | - Yongjun Zhang
- Department of Integration of Traditional Chinese and Western Medicine, Zhejiang Cancer Hospital, Hangzhou, China
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17
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Jao TM, Li YL, Lin SW, Tzeng ST, Yu IS, Yen SJ, Tsai MH, Yang YC. Alteration of colonic epithelial cell differentiation in mice deficient for glucosaminyl N-deacetylase/N-sulfotransferase 4. Oncotarget 2018; 7:84938-84950. [PMID: 27793051 PMCID: PMC5356710 DOI: 10.18632/oncotarget.12915] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 10/14/2016] [Indexed: 12/12/2022] Open
Abstract
Glucosaminyl N-deacetylase/N-sulfotransferases (NDSTs) are the first enzymes that mediate the initiation of heparan sulfate sulfation. We previously identified NDST4 as a putative tumor suppressor in human colorectal cancer. In the study, we generated an Ndst4 knockout (Ndst4-/-) mouse strain and explored its phenotypic characteristics, particularly in the development of colonic epithelial homeostasis. The Ndst4-deficient mice were viable and fertile, and their life spans were similar to those of wild-type littermates. No gross behavioral or morphological differences were observed between the Ndst4-/- and wild-type mice, and no significant changes were determined in the hematological or serum biochemical parameters of the Ndst4-/- mice. Ndst4 RNA transcripts were expressed in the brain, lung, gastrointestinal tract, pancreas, and ovary. However, Ndst4-null mice exhibited no gross or histological abnormalities in the studied organs, except for the colon. Although no alterations were observed in the crypt length or number of proliferating cells, the Ndst4-/- mice exhibited an increased number of goblet cells and a decreased number of colonocytes in the proximal colon compared with the wild-type mice. Moreover, Ndst4 deficiency increased the basal level of apoptosis in the colonic epithelium. Taken together, we established, for the first time, an Ndst4-/- mouse strain and revealed the involvement of Ndst4 in the development and homeostasis of colonic epithelium. Accordingly, NDST4 in human colon might direct the biosynthesis of specific heparan sulfate proteoglycans that are essential for the maintenance of colonic epithelial homeostasis. Thus, the loss of its function may result in the tumorigenesis and progression of colorectal cancer.
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Affiliation(s)
- Tzu-Ming Jao
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Ya-Lin Li
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Shu-Wha Lin
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University College of Medicine, Taipei, Taiwan.,Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Sheng-Tai Tzeng
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University College of Medicine, Taipei, Taiwan
| | - I-Shing Yu
- Laboratory Animal Center, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Sou-Jhy Yen
- Department of Surgery, Cardinal Tien Hospital, New Taipei City, Taiwan
| | - Ming-Hong Tsai
- Department of Surgery, Cardinal Tien Hospital, New Taipei City, Taiwan.,School of Medicine, Fu-Jen Catholic University, New Taipei City, Taiwan
| | - Ya-Chien Yang
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University College of Medicine, Taipei, Taiwan.,Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan
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18
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Prévostel C, Blache P. The dose-dependent effect of SOX9 and its incidence in colorectal cancer. Eur J Cancer 2017; 86:150-157. [DOI: 10.1016/j.ejca.2017.08.037] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 08/24/2017] [Accepted: 08/30/2017] [Indexed: 10/18/2022]
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19
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Lei-Leston AC, Murphy AG, Maloy KJ. Epithelial Cell Inflammasomes in Intestinal Immunity and Inflammation. Front Immunol 2017; 8:1168. [PMID: 28979266 PMCID: PMC5611393 DOI: 10.3389/fimmu.2017.01168] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 09/04/2017] [Indexed: 12/12/2022] Open
Abstract
Pattern recognition receptors (PRR), such as NOD-like receptors (NLRs), sense conserved microbial signatures, and host danger signals leading to the coordination of appropriate immune responses. Upon activation, a subset of NLR initiate the assembly of a multimeric protein complex known as the inflammasome, which processes pro-inflammatory cytokines and mediates a specialized form of cell death known as pyroptosis. The identification of inflammasome-associated genes as inflammatory bowel disease susceptibility genes implicates a role for the inflammasome in intestinal inflammation. Despite the fact that the functional importance of inflammasomes within immune cells has been well established, the contribution of inflammasome expression in non-hematopoietic cells remains comparatively understudied. Given that intestinal epithelial cells (IEC) act as a barrier between the host and the intestinal microbiota, inflammasome expression by these cells is likely important for intestinal immune homeostasis. Accumulating evidence suggests that the inflammasome plays a key role in shaping epithelial responses at the host-lumen interface with many inflammasome components highly expressed by IEC. Recent studies have exposed functional roles of IEC inflammasomes in mucosal immune defense, inflammation, and tumorigenesis. In this review, we present the main features of the predominant inflammasomes and their effector mechanisms contributing to intestinal homeostasis and inflammation. We also discuss existing controversies in the field and open questions related to their implications in disease. A comprehensive understanding of the molecular basis of intestinal inflammasome signaling could hold therapeutic potential for clinical translation.
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Affiliation(s)
- Andrea C Lei-Leston
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Alison G Murphy
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Kevin J Maloy
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
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20
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Reg4+ deep crypt secretory cells function as epithelial niche for Lgr5+ stem cells in colon. Proc Natl Acad Sci U S A 2016; 113:E5399-407. [PMID: 27573849 DOI: 10.1073/pnas.1607327113] [Citation(s) in RCA: 199] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Leucine-rich repeat-containing G-protein coupled receptor 5-positive (Lgr5(+)) stem cells reside at crypt bottoms of the small and large intestine. Small intestinal Paneth cells supply Wnt3, EGF, and Notch signals to neighboring Lgr5(+) stem cells. Whereas the colon lacks Paneth cells, deep crypt secretory (DCS) cells are intermingled with Lgr5(+) stem cells at crypt bottoms. Here, we report regenerating islet-derived family member 4 (Reg4) as a marker of DCS cells. To investigate a niche function, we eliminated DCS cells by using the diphtheria-toxin receptor gene knocked into the murine Reg4 locus. Ablation of DCS cells results in loss of stem cells from colonic crypts and disrupts gut homeostasis and colon organoid growth. In agreement, sorted Reg4(+) DCS cells promote organoid formation of single Lgr5(+) colon stem cells. DCS cells can be massively produced from Lgr5(+) colon stem cells in vitro by combined Notch inhibition and Wnt activation. We conclude that Reg4(+) DCS cells serve as Paneth cell equivalents in the colon crypt niche.
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21
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Ratanasirintrawoot S, Israsena N. Stem Cells in the Intestine: Possible Roles in Pathogenesis of Irritable Bowel Syndrome. J Neurogastroenterol Motil 2016; 22:367-82. [PMID: 27184041 PMCID: PMC4930294 DOI: 10.5056/jnm16023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 03/08/2016] [Indexed: 12/13/2022] Open
Abstract
Irritable bowel syndrome is one of the most common functional gastrointestinal (GI) disorders that significantly impair quality of life in patients. Current available treatments are still not effective and the pathophysiology of this condition remains unclearly defined. Recently, research on intestinal stem cells has greatly advanced our understanding of various GI disorders. Alterations in conserved stem cell regulatory pathways such as Notch, Wnt, and bone morphogenic protein/TGF-β have been well documented in diseases such as inflammatory bowel diseases and cancer. Interaction between intestinal stem cells and various signals from their environment is important for the control of stem cell self-renewal, regulation of number and function of specific intestinal cell types, and maintenance of the mucosal barrier. Besides their roles in stem cell regulation, these signals are also known to have potent effects on immune cells, enteric nervous system and secretory cells in the gut, and may be responsible for various aspects of pathogenesis of functional GI disorders, including visceral hypersensitivity, altered gut motility and low grade gut inflammation. In this article, we briefly summarize the components of these signaling pathways, how they can be modified by extrinsic factors and novel treatments, and provide evidenced support of their roles in the inflammation processes. Furthermore, we propose how changes in these signals may contribute to the symptom development and pathogenesis of irritable bowel syndrome.
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Affiliation(s)
- Sutheera Ratanasirintrawoot
- Stem Cell and Cell Therapy Research Unit, Chulalongkorn University, Bangkok, Thailand.,Department of Research Affairs, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Nipan Israsena
- Stem Cell and Cell Therapy Research Unit, Chulalongkorn University, Bangkok, Thailand.,Department of Pharmacology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
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22
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Srinivasan T, Than EB, Bu P, Tung KL, Chen KY, Augenlicht L, Lipkin SM, Shen X. Notch signalling regulates asymmetric division and inter-conversion between lgr5 and bmi1 expressing intestinal stem cells. Sci Rep 2016; 6:26069. [PMID: 27181744 PMCID: PMC4867651 DOI: 10.1038/srep26069] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Accepted: 04/27/2016] [Indexed: 12/19/2022] Open
Abstract
Rapidly cycling LGR5+ intestinal stem cells (ISCs) located at the base of crypts are the primary driver of regeneration. Additionally, BMI1 expression is correlated with a slow cycling pool of ISCs located at +4 position. While previous reports have shown interconversion between these two populations following tissue injury, we provide evidence that NOTCH signaling regulates the balance between these two populations and promotes asymmetric division as a mechanism for interconversion in the mouse intestine. In both in vitro and in vivo models, NOTCH suppression reduces the ratio of BMI1+/LGR5+ ISCs while NOTCH stimulation increases this ratio. Furthermore, NOTCH signaling can activate asymmetric division after intestinal inflammation. Overall, these data provide insights into ISC plasticity, demonstrating a direct interconversion mechanism between slow- and fast-cycling ISCs.
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Affiliation(s)
- Tara Srinivasan
- Department of Biomedical Engineering, Cornell University, Ithaca, New York, 14853, USA
| | - Elaine Bich Than
- Departments of Medicine, Surgery and Pathology, Weill Cornell Medical College, New York City, New York, 10021, USA
| | - Pengcheng Bu
- Department of Biomedical Engineering, Cornell University, Ithaca, New York, 14853, USA.,School of Electrical and Computer Engineering, Cornell University, Ithaca, New York, 14853, USA
| | - Kuei-Ling Tung
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York, 14853, USA
| | - Kai-Yuan Chen
- Department of Biomedical Engineering, Cornell University, Ithaca, New York, 14853, USA
| | - Leonard Augenlicht
- Department of Oncology, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, 10461 USA
| | - Steven M Lipkin
- Departments of Medicine, Surgery and Pathology, Weill Cornell Medical College, New York City, New York, 10021, USA
| | - Xiling Shen
- Department of Biomedical Engineering, Cornell University, Ithaca, New York, 14853, USA.,School of Electrical and Computer Engineering, Cornell University, Ithaca, New York, 14853, USA.,Department of Biomedical Engineering, Duke University, Durham, North Carolina, 27708 USA
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23
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McLoughlin K, Schluter J, Rakoff-Nahoum S, Smith A, Foster K. Host Selection of Microbiota via Differential Adhesion. Cell Host Microbe 2016; 19:550-9. [DOI: 10.1016/j.chom.2016.02.021] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 01/26/2016] [Accepted: 02/29/2016] [Indexed: 12/16/2022]
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24
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Ramanan D, Cadwell K. Intrinsic Defense Mechanisms of the Intestinal Epithelium. Cell Host Microbe 2016; 19:434-41. [PMID: 27049583 DOI: 10.1016/j.chom.2016.03.003] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The intestinal epithelium is a single cell layer that facilitates the absorption of nutrients but also provides a tight barrier to prevent pathogen invasion and dissemination of commensal microbes. Specialized epithelial cells of the gastrointestinal tract achieve this frontline defense by working in concert with lymphoid, myeloid, and stromal cells to secrete an array of factors that limit direct contact between the epithelium and infectious agents. The importance of these mechanisms is underscored by the ability of enteric pathogens to target these mechanisms to achieve invasion and dissemination. This review highlights recent advances in our understanding of these intricate molecular and cellular mechanisms adopted by these cells to promote spatial segregation and barrier maintenance.
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Affiliation(s)
- Deepshika Ramanan
- Kimmel Center for Biology and Medicine at the Skirball Institute, New York University School of Medicine, New York, NY 10016, USA; Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine, New York, NY 10016, USA
| | - Ken Cadwell
- Kimmel Center for Biology and Medicine at the Skirball Institute, New York University School of Medicine, New York, NY 10016, USA; Department of Microbiology, New York University School of Medicine, New York, NY 10016, USA.
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25
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Mizoguchi A, Takeuchi T, Himuro H, Okada T, Mizoguchi E. Genetically engineered mouse models for studying inflammatory bowel disease. J Pathol 2015; 238:205-19. [PMID: 26387641 DOI: 10.1002/path.4640] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 09/05/2015] [Accepted: 09/14/2015] [Indexed: 12/11/2022]
Abstract
Inflammatory bowel disease (IBD) is a chronic intestinal inflammatory condition that is mediated by very complex mechanisms controlled by genetic, immune, and environmental factors. More than 74 kinds of genetically engineered mouse strains have been established since 1993 for studying IBD. Although mouse models cannot fully reflect human IBD, they have provided significant contributions for not only understanding the mechanism, but also developing new therapeutic means for IBD. Indeed, 20 kinds of genetically engineered mouse models carry the susceptibility genes identified in human IBD, and the functions of some other IBD susceptibility genes have also been dissected out using mouse models. Cutting-edge technologies such as cell-specific and inducible knockout systems, which were recently employed to mouse IBD models, have further enhanced the ability of investigators to provide important and unexpected rationales for developing new therapeutic strategies for IBD. In this review article, we briefly introduce 74 kinds of genetically engineered mouse models that spontaneously develop intestinal inflammation.
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Affiliation(s)
- Atsushi Mizoguchi
- Department of Immunology, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka, 830-0011, Japan
| | - Takahito Takeuchi
- Department of Immunology, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka, 830-0011, Japan
| | - Hidetomo Himuro
- Department of Immunology, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka, 830-0011, Japan
| | - Toshiyuki Okada
- Department of Immunology, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka, 830-0011, Japan
| | - Emiko Mizoguchi
- Gastrointestinal Unit and Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Harvard Medical School, Fruit Street, Boston, MA, 02114, USA
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26
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Wang H, Liang L, Fang JY, Xu J. Somatic gene copy number alterations in colorectal cancer: new quest for cancer drivers and biomarkers. Oncogene 2015; 35:2011-9. [PMID: 26257062 DOI: 10.1038/onc.2015.304] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 07/07/2015] [Accepted: 07/12/2015] [Indexed: 02/06/2023]
Abstract
Colorectal cancer (CRC) results from the accumulation of genetic alterations, and somatic copy number alterations (CNAs) are crucial for the development of CRC. Genome-wide survey of CNAs provides opportunities for identifying cancer driver genes in an unbiased manner. The detection of aberrant CNAs may provide novel markers for the early diagnosis and personalized treatment of CRC. A major challenge in array-based profiling of CNAs is to distinguish the alterations that play causative roles from the random alterations that accumulate during colorectal carcinogenesis. In this view, we systematically discuss the frequent CNAs in CRC, focusing on functional genes that have potential diagnostic, prognostic and therapeutic significance.
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Affiliation(s)
- H Wang
- State Key Laboratory for Oncogenes and Related Genes; Key Laboratory of Gastroenterology & Hepatology, Ministry of Health; Division of Gastroenterology and Hepatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University; Shanghai Cancer Institute, Shanghai Institute of Digestive Disease, Shanghai, China
| | - L Liang
- State Key Laboratory for Oncogenes and Related Genes; Key Laboratory of Gastroenterology & Hepatology, Ministry of Health; Division of Gastroenterology and Hepatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University; Shanghai Cancer Institute, Shanghai Institute of Digestive Disease, Shanghai, China
| | - J-Y Fang
- State Key Laboratory for Oncogenes and Related Genes; Key Laboratory of Gastroenterology & Hepatology, Ministry of Health; Division of Gastroenterology and Hepatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University; Shanghai Cancer Institute, Shanghai Institute of Digestive Disease, Shanghai, China
| | - J Xu
- State Key Laboratory for Oncogenes and Related Genes; Key Laboratory of Gastroenterology & Hepatology, Ministry of Health; Division of Gastroenterology and Hepatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University; Shanghai Cancer Institute, Shanghai Institute of Digestive Disease, Shanghai, China
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27
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Ribosome biogenesis dysfunction leads to p53-mediated apoptosis and goblet cell differentiation of mouse intestinal stem/progenitor cells. Cell Death Differ 2015; 22:1865-76. [PMID: 26068591 DOI: 10.1038/cdd.2015.57] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 03/31/2015] [Accepted: 04/13/2015] [Indexed: 02/07/2023] Open
Abstract
Ribosome biogenesis is an essential cellular process. Its impairment is associated with developmental defects and increased risk of cancer. The in vivo cellular responses to defective ribosome biogenesis and the underlying molecular mechanisms are still incompletely understood. In particular, the consequences of impaired ribosome biogenesis within the intestinal epithelium in mammals have not been investigated so far. Here we adopted a genetic approach to investigate the role of Notchless (NLE), an essential actor of ribosome biogenesis, in the adult mouse intestinal lineage. Nle deficiency led to defects in the synthesis of large ribosomal subunit in crypts cells and resulted in the rapid elimination of intestinal stem cells and progenitors through distinct types of cellular responses, including apoptosis, cell cycle arrest and biased differentiation toward the goblet cell lineage. Similar observations were made using the rRNA transcription inhibitor CX-5461 on intestinal organoids culture. Importantly, we found that p53 activation was responsible for most of the cellular responses observed, including differentiation toward the goblet cell lineage. Moreover, we identify the goblet cell-specific marker Muc2 as a direct transcriptional target of p53. Nle-deficient ISCs and progenitors disappearance persisted in the absence of p53, underlying the existence of p53-independent cellular responses following defective ribosome biogenesis. Our data indicate that NLE is a crucial factor for intestinal homeostasis and provide new insights into how perturbations of ribosome biogenesis impact on cell fate decisions within the intestinal epithelium.
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28
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Obata Y, Hase K. Mucosal barriology: The molecular machinery and physiological significance of multiple epithelial barriers. Inflamm Regen 2015. [DOI: 10.2492/inflammregen.35.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Yuuki Obata
- Department of Immune Regulation, Graduate School of Medical and Pharmaceutical Sciences, Chiba University, Chiba, Japan
- Division of Mucosal Barriology, International Research and Development Center for Mucosal Vaccines, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Koji Hase
- Department of Biochemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
- Division of Mucosal Barriology, International Research and Development Center for Mucosal Vaccines, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
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29
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Garcia TX, Farmaha JK, Kow S, Hofmann MC. RBPJ in mouse Sertoli cells is required for proper regulation of the testis stem cell niche. Development 2014; 141:4468-78. [PMID: 25406395 DOI: 10.1242/dev.113969] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Stem cells are influenced by their surrounding microenvironment, or niche. In the testis, Sertoli cells are the key niche cells directing the population size and differentiation fate of spermatogonial stem cells (SSCs). Failure to properly regulate SSCs leads to infertility or germ cell hyperplasia. Several Sertoli cell-expressed genes, such as Gdnf and Cyp26b1, have been identified as being indispensable for the proper maintenance of SSCs in their niche, but the pathways that modulate their expression have not been identified. Although we have recently found that constitutively activating NOTCH signaling in Sertoli cells leads to premature differentiation of all prospermatogonia and sterility, suggesting that there is a crucial role for this pathway in the testis stem cell niche, a true physiological function of NOTCH signaling in Sertoli cells has not been demonstrated. To this end, we conditionally ablated recombination signal binding protein for immunoglobulin kappa J region (Rbpj), a crucial mediator of NOTCH signaling, in Sertoli cells using Amh-cre. Rbpj knockout mice had: significantly increased testis sizes; increased expression of niche factors, such as Gdnf and Cyp26b1; significant increases in the number of pre- and post-meiotic germ cells, including SSCs; and, in a significant proportion of mice, testicular failure and atrophy with tubule lithiasis, possibly due to these unsustainable increases in the number of germ cells. We also identified germ cells as the NOTCH ligand-expressing cells. We conclude that NOTCH signaling in Sertoli cells is required for proper regulation of the testis stem cell niche and is a potential feedback mechanism, based on germ cell input, that governs the expression of factors that control SSC proliferation and differentiation.
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Affiliation(s)
- Thomas Xavier Garcia
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Unit 1105, PO Box 301402, Houston, TX 77230-1402, USA Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, Urbana, IL 61802, USA
| | - Jaspreet Kaur Farmaha
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Unit 1105, PO Box 301402, Houston, TX 77230-1402, USA Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, Urbana, IL 61802, USA
| | - Sean Kow
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Unit 1105, PO Box 301402, Houston, TX 77230-1402, USA Department of Biochemistry & Cell Biology, Rice University, PO Box 1892, MS-140, Houston, TX 77251-1892, USA
| | - Marie-Claude Hofmann
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Unit 1105, PO Box 301402, Houston, TX 77230-1402, USA Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, Urbana, IL 61802, USA
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30
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Intestinal barrier function and the brain-gut axis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 817:73-113. [PMID: 24997030 DOI: 10.1007/978-1-4939-0897-4_4] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The luminal-mucosal interface of the intestinal tract is the first relevant location where microorganism-derived antigens and all other potentially immunogenic particles face the scrutiny of the powerful mammalian immune system. Upon regular functioning conditions, the intestinal barrier is able to effectively prevent most environmental and external antigens to interact openly with the numerous and versatile elements that compose the mucosal-associated immune system. This evolutionary super system is capable of processing an astonishing amount of antigens and non-immunogenic particles, approximately 100 tons in one individual lifetime, only considering food-derived components. Most important, to develop oral tolerance and proper active immune responses needed to prevent disease and inflammation, this giant immunogenic load has to be managed in a way that physiological inflammatory balance is constantly preserved. Adequate functioning of the intestinal barrier involves local and distant regulatory networks integrating the so-called brain-gut axis. Along this complex axis both brain and gut structures participate in the processing and execution of response signals to external and internal changes coming from the digestive tract, using multidirectional pathways to communicate. Dysfunction of brain-gut axis facilitates malfunctioning of the intestinal barrier, and vice versa, increasing the risk of uncontrolled immunological reactions that may trigger mucosal and brain low-grade inflammation, a putative first step to the initiation of more permanent gut disorders. In this chapter, we describe the structure, function and interactions of intestinal barrier, microbiota and brain-gut axis in both healthy and pathological conditions.
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31
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Hornef MW, Fulde M. Ontogeny of intestinal epithelial innate immune responses. Front Immunol 2014; 5:474. [PMID: 25346729 PMCID: PMC4191320 DOI: 10.3389/fimmu.2014.00474] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Accepted: 09/16/2014] [Indexed: 12/18/2022] Open
Abstract
Emerging evidence indicates that processes during postnatal development might significantly influence the establishment of mucosal host-microbial homeostasis. Developmental and adaptive immunological processes but also environmental and microbial exposure early after birth might thus affect disease susceptibility and health during adult life. The present review aims at summarizing the current understanding of the intestinal epithelial innate immune system and its developmental and adaptive changes after birth.
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Affiliation(s)
- Mathias W Hornef
- Institute for Medical Microbiology and Hospital Epidemiology, Hannover Medical School , Hannover , Germany ; Institute of Medical Microbiology, RWTH University , Aachen , Germany
| | - Marcus Fulde
- Institute for Medical Microbiology and Hospital Epidemiology, Hannover Medical School , Hannover , Germany
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32
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Dai Y, Wilson G, Huang B, Peng M, Teng G, Zhang D, Zhang R, Ebert MPA, Chen J, Wong BCY, Chan KW, George J, Qiao L. Silencing of Jagged1 inhibits cell growth and invasion in colorectal cancer. Cell Death Dis 2014; 5:e1170. [PMID: 24722295 PMCID: PMC5424114 DOI: 10.1038/cddis.2014.137] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2014] [Revised: 02/18/2014] [Accepted: 02/26/2014] [Indexed: 01/09/2023]
Abstract
Dysregulated Notch signaling has a critical role in the tumorigenesis. Jagged1, a Notch ligand, is overexpressed in various human cancers. Recent studies revealed the involvement of Jagged1 in colorectal cancer (CRC) development. These basic studies provide a promising potential for inhibition of the Notch pathway for the treatment of CRC. Herein, we aimed to investigate the consequences of targeting Jagged1 using shRNA on CRC both in vitro and in vivo to test their potential to inhibit this key element for CRC treatment. We found that downregulation of Jagged1 with lentiviral Jagged1-shRNA resulted in decreased colon cancer cell viability in vitro, most likely mediated through reduced cell proliferation. Importantly, Jagged1 knockdown induced G0/G1 phase cell cycle arrest, with reduced Cyclin D1, Cyclin E and c-Myc expression. Silencing of Jagged1 reduced the migration and invasive capacity of the colon cancer cells in vitro. Furthermore, colon cancer cells with knockdown of Jagged1 had much slower growth rate than control cells in a xenograft mouse model in vivo, with a marked downregulation of cell proliferation markers (PCNA, Ki-67, and c-Myc) and metastasis markers (MMP-2 and MMP-9). These findings rationalize a mechanistic approach to CRC treatment based on Jagged1-targeted therapeutic development.
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Affiliation(s)
- Y Dai
- Department of Gastroenterology, Peking University First Hospital, Beijing, China
| | - G Wilson
- Storr Liver Unit, Westmead Millennium Institute, Department of Medicine and Western Clinical School, The University of Sydney, Westmead, NSW, Australia
| | - B Huang
- Research Center of Basic Medical Sciences and Department of Immunology, Key Laboratory of Immune Microenvironment and Diseases of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - M Peng
- Research Center of Basic Medical Sciences and Department of Immunology, Key Laboratory of Immune Microenvironment and Diseases of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - G Teng
- Department of Gastroenterology, Peking University First Hospital, Beijing, China
| | - D Zhang
- Research Center of Basic Medical Sciences and Department of Immunology, Key Laboratory of Immune Microenvironment and Diseases of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - R Zhang
- Research Center of Basic Medical Sciences and Department of Immunology, Key Laboratory of Immune Microenvironment and Diseases of Educational Ministry of China, Tianjin Medical University, Tianjin, China
| | - M P A Ebert
- Department of Medicine II, Klinikum Rechts der Isar, Technical University, Munich, Germany
| | - J Chen
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - B C Y Wong
- Departments of Medicine, The University of Hong Kong, Pokfulam, Hong Kong
| | - K W Chan
- Departments of Pathology, The University of Hong Kong, Pokfulam, Hong Kong
| | - J George
- Storr Liver Unit, Westmead Millennium Institute, Department of Medicine and Western Clinical School, The University of Sydney, Westmead, NSW, Australia
| | - L Qiao
- Storr Liver Unit, Westmead Millennium Institute, Department of Medicine and Western Clinical School, The University of Sydney, Westmead, NSW, Australia
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Abstract
The colon serves as the habitat for trillions of microbes, which it must maintain, regulate, and sequester. This is managed by what is termed the mucosal barrier. The mucosal barrier separates the gut flora from the host tissues; regulates the absorption of water, electrolytes, minerals, and vitamins; and facilitates host-flora interactions. Colonic homeostasis depends on a complex interaction between the microflora and the mucosal epithelium, immune system, vasculature, stroma, and nervous system. Disruptions in the colonic microenvironment such as changes in microbial composition, epithelial cell function/proliferation/differentiation, mucus production/makeup, immune function, diet, motility, or blood flow may have substantial local and systemic consequences. Understanding the complex activities of the colon in health and disease is important in drug development, as xenobiotics can impact all segments of the colon. Direct and indirect effects of pharmaceuticals on intestinal function can produce adverse findings in laboratory animals and humans and can negatively impact drug development. This review will discuss normal colon homeostasis with examples, where applicable, of xenobiotics that disrupt normal function.
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Affiliation(s)
- Rani S Sellers
- 1Albert Einstein College of Medicine, Bronx, New York, USA
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34
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Wang C, Li X, Wang H, Xie Q, Xu Y. Notch1-Nuclear Factor κB Involves in Oxidative Stress-Induced Alcoholic Steatohepatitis. Alcohol Alcohol 2013; 49:10-6. [DOI: 10.1093/alcalc/agt167] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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35
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Pastorelli L, De Salvo C, Mercado JR, Vecchi M, Pizarro TT. Central role of the gut epithelial barrier in the pathogenesis of chronic intestinal inflammation: lessons learned from animal models and human genetics. Front Immunol 2013; 4:280. [PMID: 24062746 PMCID: PMC3775315 DOI: 10.3389/fimmu.2013.00280] [Citation(s) in RCA: 312] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Accepted: 08/29/2013] [Indexed: 12/12/2022] Open
Abstract
The gut mucosa is constantly challenged by a bombardment of foreign antigens and environmental microorganisms. As such, the precise regulation of the intestinal barrier allows the maintenance of mucosal immune homeostasis and prevents the onset of uncontrolled inflammation. In support of this concept, emerging evidence points to defects in components of the epithelial barrier as etiologic factors in the pathogenesis of inflammatory bowel diseases (IBDs). In fact, the integrity of the intestinal barrier relies on different elements, including robust innate immune responses, epithelial paracellular permeability, epithelial cell integrity, as well as the production of mucus. The purpose of this review is to systematically evaluate how alterations in the aforementioned epithelial components can lead to the disruption of intestinal immune homeostasis, and subsequent inflammation. In this regard, the wealth of data from mouse models of intestinal inflammation and human genetics are pivotal in understanding pathogenic pathways, for example, that are initiated from the specific loss of function of a single protein leading to the onset of intestinal disease. On the other hand, several recently proposed therapeutic approaches to treat human IBD are targeted at enhancing different elements of gut barrier function, further supporting a primary role of the epithelium in the pathogenesis of chronic intestinal inflammation and emphasizing the importance of maintaining a healthy and effective intestinal barrier.
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Affiliation(s)
- Luca Pastorelli
- Department of Pathology, Case Western Reserve University School of Medicine , Cleveland, OH , USA ; Department of Biomedical Sciences for Health, University of Milan , Milan , Italy ; Gastroenterology and Digestive Endoscopy Unit, IRCCS Policlinico San Donato , San Donato Milanese , Italy
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36
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Neonatal immune adaptation of the gut and its role during infections. Clin Dev Immunol 2013; 2013:270301. [PMID: 23737810 PMCID: PMC3659470 DOI: 10.1155/2013/270301] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Accepted: 04/03/2013] [Indexed: 12/22/2022]
Abstract
The intestinal tract is engaged in a relationship with a dense and complex microbial ecosystem, the microbiota. The establishment of this symbiosis is essential for host physiology, metabolism, and immune homeostasis. Because newborns are essentially sterile, the first exposure to microorganisms and environmental endotoxins during the neonatal period is followed by a crucial sequence of active events leading to immune tolerance and homeostasis. Contact with potent immunostimulatory molecules starts immediately at birth, and the discrimination between commensal bacteria and invading pathogens is essential to avoid an inappropriate immune stimulation and/or host infection. The dysregulation of these tight interactions between host and microbiota can be responsible for important health disorders, including inflammation and sepsis. This review summarizes the molecular events leading to the establishment of postnatal immune tolerance and how pathogens can avoid host immunity and induce neonatal infections and sepsis.
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Loo LWM, Tiirikainen M, Cheng I, Lum-Jones A, Seifried A, Church JM, Gryfe R, Weisenberger DJ, Lindor NM, Gallinger S, Haile RW, Duggan DJ, Thibodeau SN, Casey G, Le Marchand L. Integrated analysis of genome-wide copy number alterations and gene expression in microsatellite stable, CpG island methylator phenotype-negative colon cancer. Genes Chromosomes Cancer 2013; 52:450-66. [PMID: 23341073 DOI: 10.1002/gcc.22043] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Revised: 12/04/2012] [Accepted: 12/16/2012] [Indexed: 12/11/2022] Open
Abstract
Microsatellite stable (MSS), CpG island methylator phenotype (CIMP)-negative colorectal tumors, the most prevalent molecular subtype of colorectal cancer, are associated with extensive copy number alteration (CNA) events and aneuploidy. We report on the identification of characteristic recurrent CNA (with frequency >25%) events and associated gene expression profiles for a total of 40 paired tumor and adjacent normal colon tissues using genome-wide microarrays. We observed recurrent CNAs, namely gains at 1q, 7p, 7q, 8p12-11, 8q, 12p13, 13q, 20p, 20q, Xp, and Xq and losses at 1p36, 1p31, 1p21, 4p15-12, 4q12-35, 5q21-22, 6q26, 8p, 14q, 15q11-12, 17p, 18p, 18q, 21q21-22, and 22q. Within these genomic regions we identified 356 genes with significant differential expression (P < 0.0001 and ±1.5-fold change) in the tumor compared to adjacent normal tissue. Gene ontology and pathway analyses indicated that many of these genes were involved in functional mechanisms that regulate cell cycle, cell death, and metabolism. An amplicon present in >70% of the tumor samples at 20q11-20q13 contained several cancer-related genes (AHCY, POFUT1, RPN2, TH1L, and PRPF6) that were upregulated and demonstrated a significant linear correlation (P < 0.05) for gene dosage and gene expression. Copy number loss at 8p, a CNA associated with adenocarcinoma and poor prognosis, was observed in >50% of the tumor samples and demonstrated a significant linear correlation for gene dosage and gene expression for two potential tumor suppressor genes, MTUS1 (8p22) and PPP2CB (8p12). The results from our integration analysis illustrate the complex relationship between genomic alterations and gene expression in colon cancer.
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Affiliation(s)
- Lenora W M Loo
- Epidemiology Program, University of Hawaii Cancer Center, Honolulu, HI 96813, USA.
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Abstract
The small and large intestines are tubular organs composed of several tissue types. The columnar epithelium that lines the inner surface of the intestines distinguishes the digestive physiology of each region of the intestine and consists of several distinct cell types that are rapidly and continually renewed by intestinal stem cells that reside near the base of the crypts of Lieberkühn. Notch signaling controls the fate of intestinal stem cells by regulating the expression of Hes genes and by repressing Atoh1. Alternate models of Notch pathway control of cell fate determination are presented. Roles for Notch signaling in development of the intestine, including mesenchymal and neural cells, are discussed. The oncogenic activities of Notch in colorectal cancer, as well as the tumor suppressive activities of Atoh1, are reviewed. Therapeutic targeting of the Notch pathway in colorectal cancers is discussed, along with potential caveats.
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Affiliation(s)
- Taeko K Noah
- Division of Gastroenterology, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio 45229, USA
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Pott J, Hornef M. Innate immune signalling at the intestinal epithelium in homeostasis and disease. EMBO Rep 2012; 13:684-98. [PMID: 22801555 DOI: 10.1038/embor.2012.96] [Citation(s) in RCA: 140] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Accepted: 06/07/2012] [Indexed: 02/06/2023] Open
Abstract
The intestinal epithelium--which constitutes the interface between the enteric microbiota and host tissues--actively contributes to the maintenance of mucosal homeostasis and defends against pathogenic microbes. The recognition of conserved microbial products by cytosolic or transmembrane pattern recognition receptors in epithelial cells initiates signal transduction and influences effector cell function. However, the signalling pathways, effector molecules and regulatory mechanisms involved are not yet fully understood, and the functional outcome is poorly defined. This review analyses the complex and dynamic role of intestinal epithelial innate immune recognition and signalling, on the basis of results in intestinal epithelial cell-specific transgene or gene-deficient animals. This approach identifies specific epithelial cell functions within the diverse cellular composition of the mucosal tissue, in the presence of the complex and dynamic gut microbiota. These insights have thus provided a more comprehensive understanding of the role of the intestinal epithelium in innate immunity during homeostasis and disease.
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Affiliation(s)
- Johanna Pott
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
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Critical roles of Notch and Wnt/β-catenin pathways in the regulation of hyperplasia and/or colitis in response to bacterial infection. Infect Immun 2012; 80:3107-21. [PMID: 22710872 DOI: 10.1128/iai.00236-12] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Notch and Wnt/β-catenin signals play essential roles in intestinal development and homeostasis. Citrobacter rodentium induces transmissible murine colonic hyperplasia (TMCH) and various degrees of inflammation, depending upon the genetic background. We aimed at delineating the role of the Notch and Wnt/β-catenin pathways in the regulation of colonic crypt hyperplasia and/or colitis following C. rodentium infection. During TMCH, relative levels of the Notch intracellular domain (NICD) increased significantly, along with increases in Jagged-1 and Hes-1 coinciding with the progression and regression phases of hyperplasia. Blocking of Notch signaling with dibenzazepine (DBZ) for 5 days before the onset of hyperplasia also blocked Wnt/β-catenin signaling. Targeting the Notch pathway for 5 days after the onset of hyperplasia failed to inhibit Wnt/β-catenin-regulated crypt hyperplasia. Chronic DBZ administration for 10 days blocked both Notch and Wnt signaling, disrupted the intestinal barrier, and induced colitis. Core-3(-/-) mice, which are defective in mucin secretion and are susceptible to experimental triggers of colitis, also exhibited significant colitis in response to C. rodentium plus DBZ. Chronic DBZ administration in these mice did not result in depletion of the putative stem cell marker doublecortin-like kinase-1 (DCLK1) in the crypts. Dietary bael (Aegle marmelos) extract (4%) and curcumin (4%) restored signaling via the Notch and Wnt/β-catenin pathways, thereby promoting crypt regeneration, and also replenished the mucus layer, leading to amelioration of C. rodentium- and DBZ-induced colitis in NIH:Swiss mice. Thus, the balancing act between cell proliferation and mucus production to restore barrier integrity seems to depend upon the interplay between the Wnt/β-catenin and Notch pathways in the TMCH model.
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Obata Y, Takahashi D, Ebisawa M, Kakiguchi K, Yonemura S, Jinnohara T, Kanaya T, Fujimura Y, Ohmae M, Hase K, Ohno H. Epithelial cell-intrinsic Notch signaling plays an essential role in the maintenance of gut immune homeostasis. THE JOURNAL OF IMMUNOLOGY 2012; 188:2427-36. [PMID: 22279105 DOI: 10.4049/jimmunol.1101128] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Intestinal epithelial cells (IECs) have important functions as the first line of defense against diverse microorganisms on the luminal surface. Impaired integrity of IEC has been implicated in increasing the risk for inflammatory disorders in the gut. Notch signaling plays a critical role in the maintenance of epithelial integrity by regulating the balance of secretory and absorptive cell lineages, and also by facilitating epithelial cell proliferation. We show in this article that mice harboring IEC-specific deletion of Rbpj (RBP-J(ΔIEC)), a transcription factor that mediates signaling through Notch receptors, spontaneously develop chronic colitis characterized by the accumulation of Th17 cells in colonic lamina propria. Intestinal bacteria are responsible for the development of colitis, because their depletion with antibiotics prevented the development of colitis in RBP-J(ΔIEC) mice. Furthermore, bacterial translocation was evident in the colonic mucosa of RBP-J(ΔIEC) mice before the onset of colitis, suggesting attenuated epithelial barrier functions in these mice. Indeed, RBP-J(ΔIEC) mice displayed increase in intestinal permeability after rectal administration of FITC-dextran. In addition to the defect in physical barrier, loss of Notch signaling led to arrest of epithelial cell turnover caused by downregulation of Hes1, a transcriptional repressor of p27(Kip1) and p57(Kip2). Thus, epithelial cell-intrinsic Notch signaling ensures integrity and homeostasis of IEC, and this mechanism is required for containment of intestinal inflammation.
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Affiliation(s)
- Yuuki Obata
- Graduate School of Medical and Pharmaceutical Sciences, Chiba University, Chiba, Chiba 260-8670, Japan
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Guilmeau S. Notch signaling and intestinal cancer. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 727:272-88. [PMID: 22399355 DOI: 10.1007/978-1-4614-0899-4_21] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
In recent years, a substantial body of evidence has accumulated to support the notion that signaling pathways known to be important during embryonic development play important roles in regulating self-renewing tissues and tumorigenesis. In this context, Notch signaling is now recognized as essential for maintaining progenitor/ stem cell population as well as for regulating cell lineage differentiation in the normal intestinal mucosa. Many studies have also showed that Notch signaling is constitutively activated in colorectal cancer and its inhibition is able to suppress the cell growth and sensitize cancer cells to treatment-induced apoptosis. Therefore, discovery of the role of γ-secretase in the Notch signaling activation has prompted intensive research on the potential use of γ-secretase inhibitors in the treatment of colon cancer. This chapter reviews the current understanding and research findings of the role of Notch signaling in intestinal homeostasis and colorectal cancer and discusses the possible Notch targeting approaches as novel molecular therapy for intestinal cancer.
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Affiliation(s)
- Sandra Guilmeau
- Département d'Endocrinologie, Université Paris Descartes, Paris, France.
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Zwielehner J, Lassl C, Hippe B, Pointner A, Switzeny OJ, Remely M, Kitzweger E, Ruckser R, Haslberger AG. Changes in human fecal microbiota due to chemotherapy analyzed by TaqMan-PCR, 454 sequencing and PCR-DGGE fingerprinting. PLoS One 2011; 6:e28654. [PMID: 22194876 PMCID: PMC3237468 DOI: 10.1371/journal.pone.0028654] [Citation(s) in RCA: 151] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Accepted: 11/11/2011] [Indexed: 12/14/2022] Open
Abstract
Background We investigated whether chemotherapy with the presence or absence of antibiotics against different kinds of cancer changed the gastrointestinal microbiota. Methodology/Principal Findings Feces of 17 ambulant patients receiving chemotherapy with or without concomitant antibiotics were analyzed before and after the chemotherapy cycle at four time points in comparison to 17 gender-, age- and lifestyle-matched healthy controls. We targeted 16S rRNA genes of all bacteria, Bacteroides, bifidobacteria, Clostridium cluster IV and XIVa as well as C. difficile with TaqMan qPCR, denaturing gradient gel electrophoresis (DGGE) fingerprinting and high-throughput sequencing. After a significant drop in the abundance of microbiota (p = 0.037) following a single treatment the microbiota recovered within a few days. The chemotherapeutical treatment marginally affected the Bacteroides while the Clostridium cluster IV and XIVa were significantly more sensitive to chemotherapy and antibiotic treatment. DGGE fingerprinting showed decreased diversity of Clostridium cluster IV and XIVa in response to chemotherapy with cluster IV diversity being particularly affected by antibiotics. The occurrence of C. difficile in three out of seventeen subjects was accompanied by a decrease in the genera Bifidobacterium, Lactobacillus, Veillonella and Faecalibacterium prausnitzii. Enterococcus faecium increased following chemotherapy. Conclusions/Significance Despite high individual variations, these results suggest that the observed changes in the human gut microbiota may favor colonization with C.difficile and Enterococcus faecium. Perturbed microbiota may be a target for specific mitigation with safe pre- and probiotics.
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Affiliation(s)
| | | | - Berit Hippe
- Department of Nutritional Sciences, Vienna, Austria
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Grainger S, Lam J, Savory JGA, Mears AJ, Rijli FM, Lohnes D. Cdx regulates Dll1 in multiple lineages. Dev Biol 2011; 361:1-11. [PMID: 22015720 DOI: 10.1016/j.ydbio.2011.09.034] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 09/21/2011] [Accepted: 09/23/2011] [Indexed: 02/07/2023]
Abstract
Vertebrate Cdx genes encode homeodomain transcription factors related to caudal in Drosophila. The murine Cdx homologues Cdx1, Cdx2 and Cdx4 play important roles in anterior-posterior patterning of the embryonic axis and the intestine, as well as axial elongation. While our understanding of the ontogenic programs requiring Cdx function has advanced considerably, the molecular bases underlying these functions are less well understood. In this regard, Cdx1-Cdx2 conditional mutants exhibit abnormal somite formation, while loss of Cdx1-Cdx2 in the intestinal epithelium results in a shift in differentiation toward the Goblet cell lineage. The aim of the present study was to identify the Cdx-dependent mechanisms impacting on these events. Consistent with prior work implicating Notch signaling in these pathways, we found that expression of the Notch ligand Dll1 was reduced in Cdx mutants in both the intestinal epithelium and paraxial mesoderm. Cdx members occupied the Dll1 promoter both in vivo and in vitro, while genetic analysis indicated interaction between Cdx and Dll1 pathways in both somitogenesis and Goblet cell differentiation. These findings suggest that Cdx members operate upstream of Dll1 to convey different functions in two distinct lineages.
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Affiliation(s)
- Stephanie Grainger
- Department of Cellular and Molecular Medicine, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, Canada
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VOOIJS MARC, LIU ZHENYI, KOPAN RAPHAEL. Notch: architect, landscaper, and guardian of the intestine. Gastroenterology 2011; 141:448-59. [PMID: 21689653 PMCID: PMC4050496 DOI: 10.1053/j.gastro.2011.06.003] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Revised: 06/08/2011] [Accepted: 06/08/2011] [Indexed: 12/12/2022]
Abstract
In the past decade, enormous progress has been made in understanding the role of stem cells in physiologic tissue renewal and in pathologic processes such as cancer. These findings have shed light on the identity and biological properties of such cells and the intrinsic and extrinsic signals that balance stem cell self-renewal with differentiation. With its astonishing self-renewal capacity, the intestinal epithelium has provided a unique model to study stem cell biology, lineage specification, and cancer. Here we review the role of Notch signaling in physiologic cell renewal and differentiation in the intestine as well as during its malignant transformation.
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Affiliation(s)
- MARC VOOIJS
- Department of Radiotherapy, Maastricht Radiation Oncology (MAASTRO)/GROW School for Developmental Biology and Oncology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - ZHENYI LIU
- Department of Developmental Biology, Washington University School of Medicine, St Louis, Missouri
| | - RAPHAEL KOPAN
- Department of Developmental Biology, Washington University School of Medicine, St Louis, Missouri
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Kazanjian A, Shroyer NF. NOTCH Signaling and ATOH1 in Colorectal Cancers. CURRENT COLORECTAL CANCER REPORTS 2011; 7:121-127. [PMID: 21980310 DOI: 10.1007/s11888-011-0090-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The Notch receptor signaling pathway regulates expression of the basic helix-loop-helix transcription factor ATOH1 (Math1/Hath1) to determine cell fate in the intestine. In differentiating intestinal stem cells, high levels of Notch activity specify absorptive enterocyte/colonocyte differentiation, whereas high ATOH1 activity specifies secretory (goblet, enteroendocrine, and Paneth) cell differentiation. In colorectal cancer, ATOH1 is a tumor suppressor that is silenced in most tumors, while Notch is oncogenic and often highly active in human tumors. In other gastrointestinal malignancies with features of intestinal metaplasia, such as esophageal and gastric cancers, the Notch-ATOH1 pathway becomes activated. In cancers and preneoplastic tissues that retain the ability to activate ATOH1, therapeutic targeting of this pathway can be achieved by inhibiting Notch activity (with Notch-targeting antibodies or small-molecule inhibitors of γ-secretase). Thus, targeting the Notch-ATOH1 pathway represents a novel approach to differentiation therapy in gastrointestinal cancers.
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Affiliation(s)
- Avedis Kazanjian
- Division of Gastroenterology, Hepatology, and Nutrition, Cincinnati Children's Hospital, MLC 2010, 3333 Burnet Ave, Cincinnati, OH 45229, USA
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Lin HY, Kao CH, Lin KMC, Kaartinen V, Yang LT. Notch signaling regulates late-stage epidermal differentiation and maintains postnatal hair cycle homeostasis. PLoS One 2011; 6:e15842. [PMID: 21267458 PMCID: PMC3022660 DOI: 10.1371/journal.pone.0015842] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Accepted: 11/25/2010] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Notch signaling involves ligand-receptor interactions through direct cell-cell contact. Multiple Notch receptors and ligands are expressed in the epidermis and hair follicles during embryonic development and the adult stage. Although Notch signaling plays an important role in regulating differentiation of the epidermis and hair follicles, it remains unclear how Notch signaling participates in late-stage epidermal differentiation and postnatal hair cycle homeostasis. METHODOLOGY AND PRINCIPAL FINDINGS We applied Cre/loxP system to generate conditional gene targeted mice that allow inactivation of critical components of Notch signaling pathway in the skin. Rbpj, the core component of all four Notch receptors, and Pofut1, an essential factor for ligand-receptor interactions, were inactivated in hair follicle lineages and suprabasal layer of the epidermis using the Tgfb3-Cre mouse line. Rbpj conditional inactivation resulted in granular parakeratosis and reactive epidermal hyperplasia. Pofut1 conditional inactivation led to ultrastructural abnormalities in the granular layer and altered filaggrin processing in the epidermis, suggesting a perturbation of the granular layer differentiation. Disruption of Pofut1 in hair follicle lineages resulted in aberrant telogen morphology, a decrease of bulge stem cell markers, and a concomitant increase of K14-positive keratinocytes in the isthmus of mutant hair follicles. Pofut1-deficent hair follicles displayed a delay in anagen re-entry and dysregulation of proliferation and apoptosis during the hair cycle transition. Moreover, increased DNA double stand breaks were detected in Pofut1-deficent hair follicles, and real time PCR analyses on bulge keratinocytes isolated by FACS revealed an induction of DNA damage response and a paucity of DNA repair machinery in mutant bulge keratinocytes. SIGNIFICANCE our data reveal a role for Notch signaling in regulating late-stage epidermal differentiation. Notch signaling is required for postnatal hair cycle homeostasis by maintaining proper proliferation and differentiation of hair follicle stem cells.
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Affiliation(s)
- Hsien-Yi Lin
- Institute of Cellular and System Medicine, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Cheng-Heng Kao
- Center of General Education, Chang Gung University, Tao-Yuan, Taiwan, Republic of China
| | - Kurt Ming-Chao Lin
- Division of Medical Engineering, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
| | - Vesa Kaartinen
- Department of Biologic and Materials Sciences, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Liang-Tung Yang
- Institute of Cellular and System Medicine, National Health Research Institutes, Miaoli County, Taiwan, Republic of China
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Wang D, Pezo RC, Corner G, Sison C, Lesser ML, Shenoy SM, Mariadason JM, Singer RH, Augenlicht LH. Altered dynamics of intestinal cell maturation in Apc1638N/+ mice. Cancer Res 2010; 70:5348-57. [PMID: 20570902 DOI: 10.1158/0008-5472.can-09-4593] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Novel imaging of active transcription sites in interphase nuclei of intestinal epithelial cells in situ showed that key genes associated with Wnt and Notch signaling were dynamically regulated as the cells underwent normal maturation during their migration along the mouse crypt-villus axis (CVA). However, oscillating patterns of activation of these genes were displaced along this axis in the histologically normal intestinal mucosa of Apc(1638N/+) mice before tumor development. Gene expression profiling then showed that the normal reprogramming of cells along the CVA was dampened in the Apc(1638N/+) mice, with an overrepresentation of c-myc target genes among those loci affected in the mutant mice. Moreover, in the Apc(1638N/+) mice, there was a perturbed pattern of expression of lineage-specific markers along the CVA consistent with transcription site repression of the Math1 gene, and genes encoding enzymes of every step of the tricarboxylic acid cycle were downregulated in the crypt of Apc(1638N/+) mice compared with WT, but not in the villus. These changes may alter energy metabolism and generate a pseudohypoxic state, suggested by elevated expression of Hif1alpha and its target genes. Thus, although intestinal tumors develop in Apc(1638N/+) mice on focal loss or inactivation of the WT allele, our results show that in the Apc(1638N/+) mouse, inheritance of only a single WT Apc allele perturbs the dynamic and complex reprogramming underlying normal cell maturation, which links epithelial function and homeostasis with architectural organization of the intestine.
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Affiliation(s)
- Donghai Wang
- Department of Medicine, Montefiore Medical Center, Bronx, New York 10467, USA
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Takeuchi H, Haltiwanger RS. Role of glycosylation of Notch in development. Semin Cell Dev Biol 2010; 21:638-45. [PMID: 20226260 DOI: 10.1016/j.semcdb.2010.03.003] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Revised: 03/02/2010] [Accepted: 03/03/2010] [Indexed: 11/26/2022]
Abstract
The Notch pathway is one of the major signaling pathways required for proper development in metazoans. Notch activity is regulated at numerous levels, and increasing evidence reveals the importance of "protein glycosylation" (modification of Notch receptors with sugars) for its regulation. In this review we summarize the significance of the Notch pathway in development and the players responsible for its glycosylation, and then discuss the molecular mechanisms by which protein glycosylation may regulate Notch function.
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Affiliation(s)
- Hideyuki Takeuchi
- Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794-5215, USA
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50
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Waterhouse CCM, Johnson S, Phillipson M, Zbytnuik L, Petri B, Kelly M, Lowe JB, Kubes P. Secretory cell hyperplasia and defects in Notch activity in a mouse model of leukocyte adhesion deficiency type II. Gastroenterology 2010; 138:1079-90.e1-5. [PMID: 19900444 DOI: 10.1053/j.gastro.2009.10.049] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2009] [Revised: 10/23/2009] [Accepted: 10/28/2009] [Indexed: 12/25/2022]
Abstract
BACKGROUND & AIMS Leukocyte adhesion deficiency II (LAD II) is a rare condition caused by defective protein fucosylation, causing decreased leukocyte rolling, psychomotor retardation, and poor growth. The ligand-binding activity of Notch, a gastrointestinal signaling protein, depends on O-fucosylation. We investigated Notch signaling and intestinal epithelial architecture in a mouse model of LAD II. METHODS Mice lacking 3,5-epimerase/4-reductase (FX) or FX(-/-) bone marrow chimeras (with either wild-type or FX(-/-) bone marrow) were maintained on a fucose-free diet. Intestinal secretory epithelial cells were quantified by histology and immunohistochemistry. Reverse transcription-polymerase chain reaction and immunoblot analyses were used to detect Notch-regulated genes in isolated crypt epithelium. Intestinal leukocyte-endothelial interaction was quantified by intravital microscopy. The intestinal epithelium of 2-week-old FX(-/-) mice was transfected with an adenoviral vector expressing a constitutively active form of Notch. RESULTS FX(-/-) mice rapidly exhibited secretory epithelial cell hyperplasia, reduced cell proliferation, and altered epithelial gene expression patterns consistent with reduced Notch signaling. These effects were reversed when mice were given dietary fucose or by adenoviral transfection of the intestinal epithelium with the Notch intracellular domain. CONCLUSIONS In a mouse model of LAD II, secretory cell hyperplasia occurs in the small intestine and colon; these effects depend on Notch signaling. Defects in Notch signaling might therefore be involved in the pathogenesis of this rare pediatric condition.
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Affiliation(s)
- Christopher C M Waterhouse
- Department of Paediatrics, Division of Paediatric Gastroenterology, Gastrointestinal Research Group, University of Calgary, 3280 Hospital Drive NW, Calgary, Alberta, T2N 4N1, Canada.
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