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Claudin-1

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https://www.readbyqxmd.com/read/28428961/glucose-insulin-potassium-alleviates-intestinal-mucosal-barrier-injuries-involving-decreased-expression-of-uncoupling-protein-2-and-nlr-family-pyrin-domain-containing-3-inflammasome-in-polymicrobial-sepsis
#1
Jun-Liang Zhang, Yi-Ting Chen, Guang-Dao Chen, Tao Wang, Ju-Xin Zhang, Qi-Yi Zeng
Uncoupling protein 2 (UCP2) may be critical for intestinal barrier function which may play a key role in the development of sepsis, and insulin has been reported to have anti-inflammatory effects. Male Sprague-Dawley rats were randomly allocated into five groups: control group, cecal ligation and puncture (CLP) group, sham surgery group, CLP plus glucose-insulin-potassium (GIK) group, and CLP plus glucose and potassium (GK) group. Ileum tissues were collected at 24 h after surgery. Histological and cytokine analyses, intestinal permeability tests, and western blots of intestinal epithelial tight junction component proteins and UCP2 were performed...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28421347/tu-100-exerts-a-protective-effect-against-bacterial-translocation-by-maintaining-the-tight-junction
#2
Chie Takasu, Wubetu Gizachew Yismaw, Nobuhiro Kurita, Kozo Yoshikawa, Hideya Kashihara, Toru Kono, Mitsuo Shimada
PURPOSE: We previously reported that TU-100 suppresses irinotecan hydrochloride (CPT-11)-induced inflammatory cytokines and apoptosis. However, the mechanism underlying this effect has not been fully elucidated. The aim of this study was to further clarify the mechanism of CPT-11-induced bacterial translocation (BT) and the effect of TU-100 on BT. METHODS: Cell cytotoxicity was assessed in vitro by a WST-8 assay. For the in vivo experiments, rats were randomly divided into 3 groups: the control group, the CPT-11 group (250 mg/kg i...
April 18, 2017: Surgery Today
https://www.readbyqxmd.com/read/28418915/mta1-promotes-epithelial-to-mesenchymal-transition-and-metastasis-in-non-small-cell-lung-cancer
#3
Ke Ma, Yangwei Fan, Xuyuan Dong, Danfeng Dong, Yuyan Guo, Xin Wei, Jing Ning, Qianqian Geng, Chuying Wang, Yuan Hu, Mengya Li, Wenxia Niu, Enxiao Li, Yinying Wu
The present study assessed the role of metastasis-associated protein 1 (MTA1) in epithelial to mesenchymal transition (EMT) and metastasis in non-small-cell lung cancer (NSCLC) cells using a normal lung epithelium cell line, three NSCLC cell lines, a mouse NSCLC model, and 56 clinical NSCLC samples. We observed that MTA1 overexpression decreased cellular adhesion, promoted migration and invasion, and changed cytoskeletal polarity. MTA1 knockdown had the opposite effects. MTA1 overexpression decreased E-cadherin, Claudin-1, and ZO-1 levels and increased Vimentin expression in vitro and in vivo, through activation of AKT/GSK3β/β-catenin signaling...
March 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28416823/-identification-of-a-new-pro-invasion-factor-in-tumor-microenvironment-progress-in-function-and-mechanism-of-extracellular-atp
#4
W G Fang, X X Tian
Up to 90% of all cancer related morbidity and mortality can be attributed to metastasis. In recent years the study of tumor microenvironment, its cellular and molecular components, and how they can affect neoplastic progression toward metastasis, has become a hot focus in cancer research. Accumulated evidence shows that the formation of metastasis is a multi-step sequential process, in which, the tumor cells continuously interact with the host microenvironment. Host derived factors, i.e. growth factors/inhibitors, angiogenic factors, chemokines, etc...
April 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28415724/pharmacological-inhibition-of-src-kinase-protects-against-acute-kidney-injury-in-a-murine-model-of-renal-ischemia-reperfusion
#5
Chongxiang Xiong, Xiujuan Zang, Xiaoxu Zhou, Lirong Liu, Monica V Masucci, Jinhua Tang, Xuezhu Li, Na Liu, George Bayliss, Ting C Zhao, Shougang Zhuang
Activation of Src kinase has been implicated in the pathogenesis of acute brain, liver, and lung injury. However, the role of Src in acute kidney injury (AKI) remains unestablished. To address this, we evaluated the effects of Src inhibition on renal dysfunction and pathological changes in a murine model of AKI induced by ischemia/reperfusion (I/R). I/R injury to the kidney resulted in increased Src phosphorylation at tyrosine 416 (activation). Administration of PP1, a highly selective Src inhibitor, blocked Src phosphorylation, improved renal function and ameliorated renal pathological damage...
March 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/28412298/tight-junction-proteins-claudin-1-and-occludin-are-important-for-cutaneous-wound-healing
#6
Thomas Volksdorf, Janina Heilmann, Sabine A Eming, Kathrin Schawjinski, Michaela Zorn-Kruppa, Christopher Ueck, Sabine Vidal-Y-Sy, Sabine Windhorst, Manfred Jücker, Ingrid Moll, Johanna M Brandner
Tight junction (TJ) proteins are known to be involved in proliferation and differentiation. These processes are essential for normal skin wound healing. Here, we investigated the TJ proteins claudin-1 and occludin in ex vivo skin wound healing models and tissue samples of acute and chronic human wounds and observed major differences in localization/expression of these proteins, with chronic wounds often showing a loss of the proteins at the wound margins and/or in the regenerating epidermis. Knockdown experiments in primary human keratinocytes showed that decreased claudin-1 expression resulted in significantly impaired scratch wound healing, with delayed migration and reduced proliferation...
April 12, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28409518/colon-epithelial-injury-in-critically-ill-colectomized-patients-aberration-of-tight-junction-proteins-and-toll-like-receptors
#7
Seija Sipola, Tero I Ala-Kokko, Jouko J Laurila, Juha Saarnio, Pasi Ohtonen, Hannu Syrjälä, Tuomo J Karttunen
BACKGROUND: Abnormal permeability and extensive epithelial injury are characteristic of colon wall damage complicating critical illness, such as sepsis, and associated with mortality. To assess mechanisms of such colon epithelial disruption, we studied expression of markers of innate immunity and intercellular junctions in patients with critical illness. METHODS: Emergency colectomy samples from 38 intensive care unit patients with sepsis, fulminant C. difficile colitis, or colon ischemia were studied...
April 13, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28406732/black-adzuki-bean-vigna-angularis-attenuates-high-fat-diet-induced-colon-inflammation-in-mice
#8
Jin-Seon Yook, Kyung-Ah Kim, Mina Kim, Youn-Soo Cha
Adzuki beans (Vigna angularis), one of the most important legume crops in East Asia, have been shown to possess potential antioxidant and anti-inflammatory effects in mice. Here, we investigated the effects of black adzuki bean (BAB) on colon inflammation triggered by high-fat diet (HD)-induced obesity in mice. We also isolated lipopolysaccharide (LPS)-stimulated peritoneal macrophages and assessed inflammation-related parameters. We found that BAB decreased the concentrations of LPS and various circulating proinflammatory cytokines such as tumor necrosis factor (TNF)-α, interleukin (IL)-1β, and IL-6 in mice with HD-induced obesity...
April 2017: Journal of Medicinal Food
https://www.readbyqxmd.com/read/28391269/rebeccamycin-attenuates-tnf-%C3%AE-induced-intestinal-epithelial-barrier-dysfunction-by-inhibiting-myosin-light-chain-kinase-production
#9
Akihiro Watari, Yuta Sakamoto, Kota Hisaie, Kazuki Iwamoto, Miho Fueta, Kiyohito Yagi, Masuo Kondoh
BACKGROUND/AIMS: Although proinflammatory cytokine-induced disruption of intestinal epithelial barrier integrity is associated with intestinal inflammatory disease, effective treatment for barrier dysfunction is lacking. Previously, we demonstrated that rebeccamycin alleviates epithelial barrier dysfunction induced by inflammatory cytokines in Caco-2 cell monolayers; however, the underlying mechanism remained unclear. Here, we investigated the mechanism by which rebeccamycin protects the epithelial barrier function of Caco-2 cells exposed to TNF-α...
April 7, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28385574/ouabain-promotes-partial-epithelial-to-mesenchymal-transition-emt-changes-in-human-autosomal-dominant-polycystic-kidney-disease-adpkd-cells
#10
Jessica Venugopal, Jeffrey McDermott, Gladis Sanchez, Madhulika Sharma, Leandro Barbosa, Gail A Reif, Darren P Wallace, Gustavo Blanco
The hormone ouabain has been shown to enhance the cystic phenotype of autosomal dominant polycystic kidney disease (ADPKD). Among other characteristics, the ADPKD phenotype includes cell de-differentiation and epithelial to mesenchymal transition (EMT). Here, we determined whether physiological concentrations of ouabain induces EMT in human renal epithelial cells from patients with ADPKD. We found that ADPKD cells respond to ouabain with a decrease in expression of the epithelial marker E-cadherin and increase in the expression of the mesenchymal markers N-cadherin, α smooth muscle actin (αSMA) and collagen-I; and the tight junction protein occludin and claudin-1...
April 3, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28381183/expression-of-claudin-1-claudin-4-and-claudin-7-in-colorectal-cancer-and-its-relation-with-cldn-dna-methylation-patterns
#11
Victoria Hahn-Strömberg, Shlear Askari, Abrar Ahmad, Rahel Befekadu, Torbjörn K Nilsson
Altered claudin expression has been described in colon, prostatic, ovarian, and breast carcinoma. However, the role of epigenetic modifications in these genes and their role in colorectal cancer is unknown. We aimed our study to investigate whether claudin protein expression and methylation of CLDN can influence the tumorigenesis of colorectal cancer. A total of 31 patients diagnosed with colorectal carcinoma was used in this study. Immunohistochemical staining was used to study protein expression in both tumor and the adjacent nonneoplastic mucosa of claudin 1, 4, and 7...
April 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28376864/antiangiogenic-effects-of-oridonin
#12
Lili Tian, Kangjie Xie, Donglai Sheng, Xiaoqing Wan, Guofu Zhu
BACKGROUND: Oridonin, the major terpene found in Rabdosia rubescens (Henmsl.) Hara, is widely used as a dietary supplement and therapeutic drug. Oridonin has been proven to possess good anti-tumour activity, but little is known about its effect on angiogenesis. The aim of this study was to investigate the antiangiogenic effects of oridonin in vivo and in vitro and prove that oridonin anti-tumour activity is based on suppressing angiogenesis. METHODS: In vitro, the antiangiogenesis effect was studied by proliferation, apoptosis, migration, invasion, and tube formation experiments on human umbilical vascular endothelial cells (HUVECs)...
April 4, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28360099/humanisation-of-a-claudin-1-specific-monoclonal-antibody-for-clinical-prevention-and-cure-of-hcv-infection-without-escape
#13
Che C Colpitts, Rajiv G Tawar, Laurent Mailly, Christine Thumann, Laura Heydmann, Sarah C Durand, Fei Xiao, Eric Robinet, Patrick Pessaux, Mirjam B Zeisel, Thomas F Baumert
OBJECTIVE: HCV infection is a leading cause of chronic liver disease and a major indication for liver transplantation. Although direct-acting antivirals (DAAs) have much improved the treatment of chronic HCV infection, alternative strategies are needed for patients with treatment failure. As an essential HCV entry factor, the tight junction protein claudin-1 (CLDN1) is a promising antiviral target. However, genotype-dependent escape via CLDN6 and CLDN9 has been described in some cell lines as a possible limitation facing CLDN1-targeted therapies...
March 30, 2017: Gut
https://www.readbyqxmd.com/read/28356132/down-regulation-of-e-cadherin-enhances-prostate-cancer-chemoresistance-via-notch-signaling
#14
Wenchu Wang, Lihui Wang, Atsushi Mizokami, Junlin Shi, Chunlin Zou, Jinlu Dai, Evan T Keller, Yi Lu, Jian Zhang
BACKGROUND: The chemoresistance of prostate cancer (PCa) is invariably associated with the aggressiveness and metastasis of this disease. New emerging evidence indicates that the epithelial-to-mesenchymal transition (EMT) may play pivotal roles in the development of chemoresistance and metastasis. As a hallmark of EMT, E-cadherin is suggested to be a key marker in the development of chemoresistance. However, the molecular mechanisms underlying PCa chemoresistance remain unclear. The current study aimed to explore the association between EMT and chemoresistance in PCa as well as whether changing the expression of E-cadherin would affect PCa chemoresistance...
March 29, 2017: Chinese Journal of Cancer
https://www.readbyqxmd.com/read/28346473/oral-administration-of-bifidobacterium-bifidum-g9-1-alleviates-rotavirus-gastroenteritis-through-regulation-of-intestinal-homeostasis-by-inducing-mucosal-protective-factors
#15
Tomohiro Kawahara, Yutaka Makizaki, Yosuke Oikawa, Yoshiki Tanaka, Ayako Maeda, Masaki Shimakawa, Satoshi Komoto, Kyoko Moriguchi, Hiroshi Ohno, Koki Taniguchi
Human rotavirus (RV) infection is a leading cause of dehydrating diarrhea in infants and young children worldwide. Since therapeutic approaches to RV gastroenteritis are limited to alleviation of dehydration with oral rehydration solutions, more direct approaches to palliate symptoms of RV gastroenteritis are required. Treatments with probiotics have been increasingly recognized as alternative safe and low cost treatments for moderate infectious diarrhea. In this study, Bifidobacterium bifidum G9-1 (BBG9-1), which has been used as an intestinal drug for several decades, was shown to have a remarkable protective effect against RV gastroenteritis in a suckling mice model...
2017: PloS One
https://www.readbyqxmd.com/read/28339048/agr2-ameliorates-tumor-necrosis-factor-%C3%AE-induced-epithelial-barrier-dysfunction-via-suppression-of-nf-%C3%AE%C2%BAb-p65-mediated-mlck-p-mlc-pathway-activation
#16
Xiaolin Ye, Mei Sun
Intestinal epithelial barrier dysfunction plays a critical role in the pathogenesis of inflammatory bowel disease (IBD). Anterior gradient protein 2 homologue (AGR2) assists in maintaining intestinal homeostasis in dextran sulphate sodium-induced mouse ileocolitis; however, it is unclear whether it modulates intestinal barrier function. Our study aimed to investigate the protective role of AGR2 in tumor necrosis factor (TNF)-α-induced intestinal epithelial barrier injury. Caco-2 cell monolayers were pre-transfected with an AGR2 plasmid and then exposed to TNF-α...
March 21, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28335773/oral-administration-of-propionic-acid-during-lactation-enhances-the-colonic-barrier-function
#17
Zhaobo Xia, Yijiang Han, Ke Wang, Shikun Guo, Dazhou Wu, Xiaozhong Huang, Zhongrong Li, Libin Zhu
BACKGROUND: Propionic acid is a three-carbon short chain fatty acid (SCFA) that has various effects on colonic functions. Although several studies have shown the effects of propionic acid on intestinal mucosal barrier function, studies of the promotion effect during pre-weaning are rare in the literature as far as we know. METHODS: Pre-weaning male Sprague-Dawley rats 7 days after birth were given an oral 0.2 mL/10 g of 200 mM propionic acid solution in the propionic acid group or normal saline solution in the control group by gavage twice a day for ten days...
March 23, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28329012/tracking-the-stochastic-fate-of-cells-of-the-renin-lineage-after-podocyte-depletion-using-multicolor-reporters-and-intravital-imaging
#18
Natalya V Kaverina, Hiroyuki Kadoya, Diana G Eng, Michael E Rusiniak, Maria Luisa S Sequeira-Lopez, R Ariel Gomez, Jeffrey W Pippin, Kenneth W Gross, Janos Peti-Peterdi, Stuart J Shankland
Podocyte depletion plays a major role in focal segmental glomerular sclerosis (FSGS). Because cells of the renin lineage (CoRL) serve as adult podocyte and parietal epithelial cell (PEC) progenitor candidates, we generated Ren1cCre/R26R-ConfettiTG/WT and Ren1dCre/R26R-ConfettiTG/WT mice to determine CoRL clonality during podocyte replacement. Four CoRL reporters (GFP, YFP, RFP, CFP) were restricted to cells in the juxtaglomerular compartment (JGC) at baseline. Following abrupt podocyte depletion in experimental FSGS, all four CoRL reporters were detected in a subset of glomeruli at day 28, where they co-expressed de novo four podocyte proteins (podocin, nephrin, WT-1 and p57) and two glomerular parietal epithelial cell (PEC) proteins (claudin-1, PAX8)...
2017: PloS One
https://www.readbyqxmd.com/read/28327343/astilbin-from-engelhardtia-chrysolepis-enhances-intestinal-barrier-functions-in-caco-2-cell-monolayers
#19
Tatsuo Nakahara, Yosuke Nishitani, Shin Nishiumi, Masaru Yoshida, Takeshi Azuma
Astilbin, which is one of polyphenolic compounds isolated from the leaves of Engelhardtia chrysolepis HANCE (Chinese name, huang-qui), is available as the effective component in food and cosmetics because of its anti-oxidant and anti-inflammatory effects. The tight junction (TJ) proteins, which protect the body from foreign substances, are related to adhesion between a cell and a cell. Previously, the enhancement of TJ's functions induced by aglycones of flavonoids has been demonstrated, but the effects of the glycosides such as astilbin have not been observed yet...
March 19, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28325366/whorling-cellular-perineurioma-a-previously-undescribed-variant-closely-mimicking-monophasic-fibrous-synovial-sarcoma
#20
Michael Michal, Dmitry V Kazakov, Abbas Agaimy, Marta Hosova, Kvetoslava Michalova, Petr Grossmann, Petr Steiner, Faruk Skenderi, Semir Vranic, Michal Michal
The authors present a distinctive perineurioma (PN) variant which morphologically strongly resembles monophasic fibrous synovial sarcoma (MSS). The patients were 3 males and 1 female. The age ranged from 15 to 61years (mean: 44years). Locations included the sole, lower jaw, palm and foot. The tumor size ranged from 1.3cm to 2.5cm in the largest dimension (mean 1.8cm). Morphologically, all tumors had an identical, monotonous appearance. The perineurial cells were closely packed and created a confluent cellular whorls and/or sheets in a scarce stroma, with only focally discernible long, slender cytoplasmic processes typical for perineurial differentiation...
April 2017: Annals of Diagnostic Pathology
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