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Claudin-1

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https://www.readbyqxmd.com/read/28636801/water-channels-and-barriers-formed-by-claudins
#1
REVIEW
Rita Rosenthal, Dorothee Günzel, Dian Theune, Carolina Czichos, Jörg-Dieter Schulzke, Michael Fromm
Physiological studies in leaky epithelia, like kidney proximal tubules and the small intestine, have documented water transport via both transcellular and paracellular pathways. The discovery of aquaporin water channels provided a molecular basis for transcellular water movement. In contrast, the contribution, or even existence, of a specific paracellular water pathway has been disputed for a long time, until the cation channel-forming tight junction protein claudin-2 was shown to also permit the paracellular passage of water through its pore...
June 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28633471/development-of-a-chicken-ileal-explant-culture-model-for-measurement-of-gut-inflammation-induced-by-lipopolysaccharide
#2
Qian Zhang, Susan D Eicher, Kolapo M Ajuwon, Todd J Applegate
Gut mucosa holds a single layer of epithelial cells and the largest mass of lymphoid tissue in the body. Although the epithelial cell culture model is widely used to assess intestinal barrier function, it has limitations for studying cellular interactions, in particular those of the immune system. In this study, a chicken ileal explant culture model was developed for investigating short-term gut inflammatory and secretory responses in an ex vivo environment. Initially, ileal explants from broilers at 21 d of age were cultured ex vivo up to 6 h...
June 16, 2017: Poultry Science
https://www.readbyqxmd.com/read/28633193/trictide-a-tricellulin-derived-peptide-to-overcome-cellular-barriers
#3
Jimmi Cording, Basak Arslan, Christian Staat, Sophie Dithmer, Susanne M Krug, Anneliese Krüger, Philipp Berndt, Ramona Günther, Lars Winkler, Ingolf E Blasig, Reiner F Haseloff
The majority of tight junction (TJ) proteins restrict the paracellular permeation of solutes via their extracellular loops (ECLs). Tricellulin tightens tricellular TJs (tTJs) and regulates bicellular TJ (bTJ) proteins. We demonstrate that the addition of recombinantly produced extracellular loop 2 (ECL2) of tricellulin opens cellular barriers. The peptidomimetic trictide, a synthetic peptide derived from tricellulin ECL2, increases the passage of ions, as well as of small and larger molecules up to 10 kDa, between 16 and 30 h after application to human epithelial colorectal adenocarcinoma cell line 2...
June 20, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28617312/autocrine-human-growth-hormone-promotes-invasive-and-cancer-stem-cell-like-behavior-of-hepatocellular-carcinoma-cells-by-stat3-dependent-inhibition-of-claudin-1-expression
#4
Yi-Jun Chen, Ming-Liang You, Qing-Yun Chong, Vijay Pandey, Qiu-Shi Zhuang, Dong-Xu Liu, Lan Ma, Tao Zhu, Peter E Lobie
Despite progress in diagnosis and treatment of hepatocellular carcinoma (HCC), the clinical outcome is still unsatisfactory. Increased expression of human growth hormone (hGH) in HCC has been reported and is associated with poor survival outcome in HCC patients. Herein, we investigated the mechanism of the oncogenic effects of hGH in HCC cell lines. In vitro functional assays demonstrated that forced expression of hGH in these HCC cell lines promoted cell proliferation, cell survival, anchorage-independent growth, cell migration, and invasion, as previously reported...
June 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28602912/synthetic-8-hydroxydeoxyguanosine-inhibited-metastasis-of-pancreatic-cancer-through-concerted-inhibitions-of-erm-and-rho-gtpase
#5
Jong-Min Park, Young-Min Han, Migyeong Jeong, Myung Hee Chung, Chang Il Kwon, Kwang Hyun Ko, Ki Baik Hahm
8-hydroxydeoxyguanosine (8-OHdG) is generated consequent to oxidative stress, but its paradoxical anti-oxidative, anti-inflammatory, and anti-mutagenic effects via Rho-GTPase inhibition were noted in various models of inflammation and cancer. Metastasis occurs through cell detachment, epithelial-mesenchymal transition (EMT), and cell migration; during these processes, changes in cell morphology are initiated through Rho-GTPase-dependent actin cytoskeleton polymerization. In this study, we explored the anti-metastatic mechanisms of 8-OHdG in Panc-1 pancreatic cancer cells...
June 8, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28598488/myosin-light-chain-kinase-knockout-improves-gut-barrier-function-and-confers-a-survival-advantage-in-polymicrobial-sepsis
#6
C Adam Lorentz, Zhe Liang, Mei Meng, Ching-Wen Chen, Benyam P Yoseph, Elise R Breed, Rohit Mittal, Nathan J Klingensmith, Alton B Farris, Eileen M Burd, Michael Koval, Mandy L Ford, Craig M Coopersmith
Sepsis-induced intestinal hyperpermeability is mediated by disruption of the epithelial tight junction, which is closely associated with the peri-junctional actin-myosin ring. Myosin light chain kinase (MLCK) phosphorylates the myosin regulatory light chain, resulting in increased permeability. The purpose of this study was to determine whether genetic deletion of MLCK would alter gut barrier function and survival from sepsis. MLCK(-/-) and wild type (WT) mice were subjected to cecal ligation and puncture and assayed for both survival and mechanistic studies...
June 7, 2017: Molecular Medicine
https://www.readbyqxmd.com/read/28594555/effect-of-aging-on-the-absorption-of-small-peptides-in-spontaneously-hypertensive-rats
#7
Vu Thi Hanh, Weilin Shen, Mitsuru Tanaka, Aino E Siltari, Riita A Korpela, Toshiro Matsui
In the present study, we aimed to evaluate the effect of aging on the absorption of small peptides in spontaneously hypertensive rats (SHRs). Three kinds of dipeptides, glycyl-sarcosine (Gly-Sar), Trp-His, and captopril (a dipeptidomimetic drug), a Gly-Sar-Sar tripeptide, a Gly-Sar-Sar-Sar tetrapeptide, and a Gly-Sar-Sar-Sar-Sar pentapeptide were administered at doses of 10 mg/kg each to 8- and 40-week-old SHRs. The peptides were all detected in their intact forms in the blood. There was a significantly promoted absorption of di-/tripeptides in aged SHRs compared with young SHRs...
June 8, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28556377/deficiency-of-filaggrin-regulates-endogenous-cysteine-protease-activity-leading-to-impaired-skin-barrier-function
#8
X W Wang, J J Wang, D Gutowska-Owsiak, M Salimi, T A Selvakumar, A Gwela, L Y Chen, Y J Wang, E Giannoulatou, G Ogg
BACKGROUND: Atopic dermatitis (AD) is a common inflammatory skin disorder, characterized by skin barrier defects and enhanced allergen priming. Null mutations in the filaggrin gene (FLG) are strongly associated with moderate to severe AD, but the pathways linking barrier dysfunction and cutaneous inflammation are still largely unknown. AIM: To assess alteration of endogenous cysteine protease activity in FLG-deficient keratinocytes, and to determine whether the alteration in cysteine protease activity affects epidermal barrier function and associated gene and protein expression...
May 29, 2017: Clinical and Experimental Dermatology
https://www.readbyqxmd.com/read/28551186/key-role-of-short-chain-fatty-acids-in-epithelial-barrier-failure-during-ruminal-acidosis
#9
Svenja Meissner, Franziska Hagen, Carolin Deiner, Dorothee Günzel, Gabriele Greco, Zanming Shen, Jörg R Aschenbach
Subacute ruminal acidosis is induced by high concentrations of short-chain fatty acids (SCFA, mainly acetate, propionate, and butyrate) that release protons to decrease the pH of the ruminal digesta. This low pH, in turn, is thought to damage epithelial barrier function. The present study applied a model of simulated ruminal acidosis ex vivo to investigate if SCFA directly contribute to epithelial barrier failure beyond their role as proton donors. Epithelial tissues from the rumen of slaughtered sheep were mounted in Ussing chambers and incubated under 3 different conditions...
May 24, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28549347/the-roles-of-ing5-in-gliomas-a-good-marker-for-tumorigenesis-and-a-potential-target-for-gene-therapy
#10
Shuang Zhao, Zhi-Juan Zhao, Hao-Yu He, Ji-Cheng Wu, Xiao-Qing Ding, Lei Yang, Ning Jia, Zhi-Jie Li, Hua-Chuan Zheng
To elucidate the anti-tumor effects and molecular mechanisms of ING5 on glioma cells, we overexpressed it in U87 cells, and examined the phenotypes and their relevant molecules. It was found that ING5 overexpression suppressed proliferation, energy metabolism, migration, invasion, and induced G2/M arrest, apoptosis, dedifferentiation, senescence, mesenchymal- epithelial transition and chemoresistance to cisplatin, MG132, paclitaxel and SAHA in U87 cells. There appeared a lower expression of N-cadherin, Twist, Slug, Zeb1, Zeb2, Snail, Ac-H3, Ac-H4, Cdc2, Cdk4 and XIAP, but a higher expression of Claudin 1, Histones 3 and 4, p21, p53, Bax, β-catenin, PI3K, Akt, and p-Akt in ING5 transfectants...
May 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28529587/expression-of-claudin-1-4-and-7-in-thyroid-neoplasms
#11
Dinç Süren, Mustafa Yildirim, Alper Sayiner, Arsenal Sezgin Alikanoğlu, Irem Atalay, Umut Riza Gündüz, Vildan Kaya, Şeyda Gündüz, Mehmet Tahir Oruç, Cem Sezer
The distinction of thyroid carcinoma from benign thyroid neoplasm, as well as the subtyping of papillary carcinoma (PC) and follicular carcinoma (FC), may be performed histopathologically in the majority of cases. However, in certain cases, it is difficult to histopathologically distinguish between PC and FC, as well as follicular adenoma (FA), FC and the dominant nodule of multinodular goiter (MNG-DN). The present study aimed to determine the roles of the expression levels of the tight junction proteins claudin 1, 4 and 7 in the differential diagnosis of PC, FC, FA, MNG-DN, medullary carcinoma (MC) and anaplastic carcinoma (AC)...
May 2017: Oncology Letters
https://www.readbyqxmd.com/read/28522609/coagulation-factor-viia-mediated-protease-activated-receptor-2-activation-leads-to-%C3%AE-catenin-accumulation-via-the-akt-gsk3%C3%AE-pathway-and-contributes-to-breast-cancer-progression
#12
Abhishek Roy, Shabbir A Ansari, Kaushik Das, Ramesh Prasad, Anindita Bhattacharya, Suman Mallik, Asis Mukherjee, Prosenjit Sen
Cell migration and invasion are very characteristic features of cancer cells that promote metastasis, which is one of the most vulnerable causes of mortality among cancer patients. Emerging evidence has shown that coagulation factors can directly mediate cancer associated complications either by enhancing thrombus formation or by initiating various signaling events leading to metastatic cancer progression. It is well-established that apart from its distinct role in blood coagulation, coagulation factor FVIIa enhances aggressive behaviors of breast cancer cells, but the underlying signaling mechanisms still remain elusive...
May 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28504618/butyrate-reduces-high-fat-diet-induced-metabolic-alterations-hepatic-steatosis-and-pancreatic-beta-cell-and-intestinal-barrier-dysfunctions-in-prediabetic-mice
#13
V A Matheus, Lcs Monteiro, R B Oliveira, D A Maschio, C B Collares-Buzato
In this study, we investigated the effect of diet supplementation with sodium butyrate (5% w/w), a short-chain fatty acid produced by the intestinal microbiota, on metabolic parameters, body adiposity, hepatic and pancreatic lipid accumulation, beta cell function/mass as well as on the structure and function of the tight junction-mediated intestinal epithelial barrier in both normal and obese/prediabetic C57 mice fed a regular (control) or high-fat diet for 60 days, respectively. Butyrate treatment significantly inhibited all the high-fat-induced metabolic dysfunctions evaluated, i...
January 1, 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28493289/intestinal-epithelial-claudins-expression-and-regulation-in-homeostasis-and-inflammation
#14
REVIEW
Vicky Garcia-Hernandez, Miguel Quiros, Asma Nusrat
The intestinal epithelium forms a highly dynamic and selective barrier that controls absorption of fluid and solutes while restricting pathogen access to underlying tissues. Barrier properties are achieved by intercellular junctions that include an apical tight junction (TJ) and subjacent adherens junctions and desmosomes. The TJ tetraspan claudin proteins form pores between epithelial cells to control paracellular fluid and ion movement. In addition to regulation of barrier function, claudin family members control epithelial homeostasis and are expressed in a spatiotemporal manner in the intestinal crypt-luminal axis...
June 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28488774/fscn1-is-upregulated-by-snai2-and-promotes-epithelial-to-mesenchymal-transition-in-head-and-necksquamous-cell-carcinoma
#15
Lei Wang, YaoPeng Jia, ZengYu Jiang, Wei Gao, BinQuan Wang
In this study, we investigated whether there is any association between the expression of FSCN1 and SNAI2and the possible underlying mechanisms in head and neck squamous cell carcinoma (HNSC). In addition, we also investigated whether FSCN1 modulates epithelial to mesenchymal transition (EMT) in HNSC cells. Microarray data of dysregulated genes in HNSC was searched in GEO datasets. The association between FSCN1 expression and the 5-year/10-year overall survival (OS), as well as the correlation between the expression of FSCN1 and SOX2, MYBL2, SNAI2, STAT1 and SOX4 were analyzed based on data in TCGA HNSC cohort (TCGA-HNSC)...
May 10, 2017: Cell Biology International
https://www.readbyqxmd.com/read/28487998/effects-of-dietary-l-tryptophan-supplementation-on-intestinal-response-to-chronic-unpredictable-stress-in-broilers
#16
Yunshuang Yue, Yuming Guo, Ying Yang
Stress has been recognized as a critical risk factor for gastrointestinal diseases in both humans and animals. However, nutritional strategies to attenuate stress-induced intestinal barrier function and underlying mechanisms remain largely unknown. This study tested the hypothesis that L-tryptophan enhanced intestinal barrier function by regulating mucosal serotonin metabolism in chronic unpredictable stress-exposed broilers. One-day-old male broilers (Arbor Acres) were fed a basal diet supplemented with or without L-tryptophan in the absence or presence of chronic unpredictable stress...
May 9, 2017: Amino Acids
https://www.readbyqxmd.com/read/28486435/regulated-entry-of-hepatitis-c-virus-into-hepatocytes
#17
REVIEW
Zhijiang Miao, Zhenrong Xie, Jing Miao, Jieyu Ran, Yue Feng, Xueshan Xia
Hepatitis C virus (HCV) is a model for the study of virus-host interaction and host cell responses to infection. Virus entry into hepatocytes is the first step in the HCV life cycle, and this process requires multiple receptors working together. The scavenger receptor class B type I (SR-BI) and claudin-1 (CLDN1), together with human cluster of differentiation (CD) 81 and occludin (OCLN), constitute the minimal set of HCV entry receptors. Nevertheless, HCV entry is a complex process involving multiple host signaling pathways that form a systematic regulatory network; this network is centrally controlled by upstream regulators epidermal growth factor receptor (EGFR) and transforming growth factor β receptor (TGFβ-R)...
May 9, 2017: Viruses
https://www.readbyqxmd.com/read/28485155/nfat5-inhibits-invasion-and-promotes-apoptosis-in-hepatocellular-carcinoma-associated-with-osmolality
#18
X Qin, Y Wang, J Li, Y Xiao, Z Liu
Hepatocellular carcinoma (HCC) is one of the most difficult cancer disease for diagnosis and treatment, with a low survival rate and high recurrence rate and mortality. Nuclear factor of activated T-cells 5 (NFAT5) is mediated by osmolality and proved to be a carcinogenic gene in some tumor. However in our study we considered NFAT5 as tumor suppressor of HCC. RT-qPCR was performed for NFAT5 expression in tumor tissues. NaCl was applied to make hyperosmotic treatment. We knockdowned and overexpressed NFAT5 to investigate its role in HCC...
May 9, 2017: Neoplasma
https://www.readbyqxmd.com/read/28456683/patchouli-alcohol-ameliorates-dextran-sodium-sulfate-induced-experimental-colitis-and-suppresses-tryptophan-catabolism
#19
Chang Qu, Zhong-Wen Yuan, Xiu-Ting Yu, Yan-Feng Huang, Guang-Hua Yang, Jian-Nan Chen, Xiao-Ping Lai, Zi-Ren Su, Hui-Fang Zeng, Ying Xie, Xiao-Jun Zhang
Despite the increased morbidity of ulcerative colitis (UC) in recent years, available treatments remain unsatisfactory. Pogostemon cablin has been widely applied to treat a variety of gastrointestinal disorders in clinic for centuries, in which patchouli alcohol (PA, C15H26O) has been identified as the major active component. This study attempted to determine the bioactivity of PA on dextran sulfate sodium (DSS)-induced mice colitis and clarify the mechanism of action. Acute colitis was induced in mice by 3% DSS for 7 days...
April 27, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28455726/developmental-expression-of-claudins-in-the-mammary-gland
#20
Heidi K Baumgartner, Michael C Rudolph, Palaniappian Ramanathan, Valerie Burns, Patricia Webb, Benjamin G Bitler, Torsten Stein, Ken Kobayashi, Margaret C Neville
Claudins are a large family of membrane proteins whose classic function is to regulate the permeability of tight junctions in epithelia. They are tetraspanins, with four alpha-helices crossing the membrane, two extracellular loops, a short cytoplasmic N-terminus and a longer and more variable C-terminus. The extracellular ends of the helices are known to undergo side-to-side (cis) interactions that allow the formation of claudin polymers in the plane of the membrane. The extracellular loops also engage in head-to-head (trans) interactions thought to mediate the formation of tight junctions...
April 28, 2017: Journal of Mammary Gland Biology and Neoplasia
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