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Abstract
Claudins are adhesion molecules located at the tight junctions between epithelial cells. A series of studies have now reported aberrant expression of claudin proteins in the context of neoplastic transformation, suggesting its role in tumorigenesis. However, the precise mechanisms are still not well understood. Studies on expression alterations of claudins have revealed a range of outcomes that reflect the complexity of claudins in terms of spatial localization, tumor type and stage of disease. The diverse and dynamic expression patterns of claudins in cancer are tightly controlled by a wide range of regulatory mechanisms, which are commonly modulated by oncogenic signaling pathways. The present review summarizes the recent knowledge describing the dysregulation of claudin expression in cancer and discusses the intrinsic and extrinsic determinants of the context-specific expression patterns of claudins.
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Yang X, Lou J, Shan W, Hu Y, Du Q, Liao Q, Xie R, Xu J. Pathogenic roles of altered calcium channels and transporters in colon tumorogenesis. Life Sci 2019; 239:116909. [DOI: 10.1016/j.lfs.2019.116909] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 09/12/2019] [Accepted: 09/23/2019] [Indexed: 01/26/2023]
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Torres JB, Knight JC, Mosley MJ, Kersemans V, Koustoulidou S, Allen D, Kinchesh P, Smart S, Cornelissen B. Imaging of Claudin-4 in Pancreatic Ductal Adenocarcinoma Using a Radiolabelled Anti-Claudin-4 Monoclonal Antibody. Mol Imaging Biol 2018; 20:292-299. [PMID: 28842811 PMCID: PMC5862916 DOI: 10.1007/s11307-017-1112-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
PURPOSE Despite its widespread use, the positron emission tomography (PET) radiotracer 2-deoxy-2-[18F]fluoro-D-glucose ([18F]FDG) has been shown in clinical settings to be ineffective for improving early diagnosis of pancreatic ductal adenocarcinoma (PDAC). A promising biomarker for PDAC detection is the tight junction protein claudin-4. The purpose of this study was to evaluate a new single-photon emission computed tomography (SPECT) imaging agent, [111In]anti-claudin-4 mAb, with regard to its ability to allow visualisation of claudin-4 in a xenograft and a genetically engineered mouse model of PDAC. PROCEDURES The ability of [111In]anti-claudin-4 mAb to selectively target claudin-4 was assessed using two human xenograft tumour models with differential claudin-4 status in mice. [111In]anti-claudin-4 mAb was also used to detect PDAC development in genetically engineered KPC mice. The PDAC status of these mice was confirmed with [18F]FDG-PET, magnetic resonance imaging (MRI), histology, and immunofluorescence microscopy. RESULTS High uptake of [111In]anti-claudin-4 mAb was observed in PDAC xenografts in mice, reaching 16.9 ± 4.5 % of injected dose per gram (% ID/g) at 72 h post-injection. This uptake was mediated specifically by the expression of claudin-4. Uptake of [111In]anti-claudin-4 mAb also enabled clear visualisation of spontaneous PDAC formation in KPC mice. CONCLUSIONS [111In]anti-claudin-4 mAb allows non-invasive detection of claudin-4 upregulation during development of PDAC and could potentially be used to aid in the early detection and characterisation of this malignancy.
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Affiliation(s)
- Julia Baguña Torres
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - James C Knight
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Michael J Mosley
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Veerle Kersemans
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Sofia Koustoulidou
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Danny Allen
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Paul Kinchesh
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Sean Smart
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Bart Cornelissen
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK.
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Gao X, Luo Z, Xiang T, Wang K, Li J, Wang P. Dihydroartemisinin Induces Endoplasmic Reticulum Stress-Mediated Apoptosis in HepG2 Human Hepatoma Cells. TUMORI JOURNAL 2018; 97:771-80. [DOI: 10.1177/030089161109700615] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Aims and Background Previous studies showed that dihydroartemisinin (DHA) possessed antitumor activity in many human tumor cells through the induction of apoptosis. The aim of this study was to investigate the effects of DHA on apoptosis in the human hepatocellular carcinoma cell line HepG2 and the possible molecular mechanisms involved. Methods The inhibitory effect of DHA on HepG2 cells was measured by MTT assay. The percentage of apoptotic cells was detected by flow cytometry with double staining of fluorescein isothiocyanate-annexin V/propidium iodide. The intracellular production of reactive oxygen species (ROS) and intracellular Ca2+ concentration ([Ca2+]i) were detected by fluorescence spectrophotometry. Protein expression of GADD153, Bcl-2 and Bax in HepG2 cells was examined by Western blot and immunocytochemistry. Results DHA significantly inhibited proliferation of HepG2 cells in a dose- and time-dependent manner. The apoptosis rates in HepG2 cells treated with 0, 50, 100 and 200 mol/L DHA for 24 hours were 2.53 ± 0.88%, 24.85 ± 3.63%, 35.27 ± 5.92% and 48.53 ± 7.76%, respectively. Compared with the control group, DHA significantly increased ROS generation and [Ca2+]i level (P <0.05), with the generation of ROS preceding the increase in [Ca2+]i. An increase in GADD153 and Bax expression and a decrease in Bcl-2 were observed in DHA-treated cells. Pretreatment with the antioxidant N-acetylcysteine could attenuate the effects of DHA in the experiments. Conclusion DHA could inhibit proliferation and induce apoptosis in HepG2 cell lines through increasing the intracellular production of ROS and [Ca2+]i. Endoplasmic reticulum stress-induced apoptosis may contribute to this effect by regulating the expression of GADD153, proapoptotic Bax, and antiapoptotic Bcl-2.
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Affiliation(s)
- Xiaoling Gao
- Institute of Life Science, Chongqing Medical University, Chongqing, PR China
| | - Ziguo Luo
- Institute of Life Science, Chongqing Medical University, Chongqing, PR China
| | - Tingxiu Xiang
- Molecular Oncology and Epigenetics Laboratory, First Affiliated Hospital of Chongqing Medical University, Chongqing, PR China
| | - Kejian Wang
- Department of Anatomy, Chongqing Medical University, Chongqing, PR China
| | - Jian Li
- Institute of Life Science, Chongqing Medical University, Chongqing, PR China
| | - Pilong Wang
- Department of Gastroenterology, First Affiliated Hospital of Chongqing Medical University, Chongqing, PR China
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Long Y, Xia JY, Chen SW, Gao CL, Liang GN, He XM, Wu J, Jiang CX, Liu X, Huang W, Wan Q, Xu Y. ATP2B1 gene Silencing Increases Insulin Sensitivity through Facilitating Akt Activation via the Ca 2+/calmodulin Signaling Pathway and Ca 2+-associated eNOS Activation in Endothelial Cells. Int J Biol Sci 2017; 13:1203-1212. [PMID: 29104511 PMCID: PMC5666335 DOI: 10.7150/ijbs.19666] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 06/28/2017] [Indexed: 01/11/2023] Open
Abstract
Endothelial cell insulin resistance may be partially responsible for the higher risk of atherosclerosis and cardiovascular disease in populations with insulin resistance and type 2 diabetes mellitus (T2DM). A genome-wide association study revealed a significant association between the ATPase plasma membrane Ca2+ transporting 1 (ATP2B1) gene and T2DM in two community-based cohorts from the Korea Association Resource Project. However, little is known about the implication of the ATP2B1 gene on T2DM. In the present study, we investigated the role of the ATP2B1 gene in endothelial cell insulin sensitivity. ATP2B1 gene silencing resulted in enhanced intracellular calcium concentrations and increased insulin-induced Akt activation compared to that in the negative siRNA-transfected HUVECs (Human Umbilical Vein Endothelial Cells). The elevated insulin sensitivity mediated by ATP2B1 gene silencing was Ca2+/calmodulin-dependent, as verified by administration of the calcium chelator BAPTA-AM or the calmodulin-specific antagonist W7. Moreover, higher levels of phosphorylation of eNOS (Ser1177) were observed in ATP2B1-silenced HUVECs. In addition to BAPTA-AM and W7, L-NAME, an eNOS antagonist, abolished insulin-induced Akt phosphorylation at Ser473 in both si-Neg and si-ATP2B1-transfected endothelial cells. These results indicate that the enhanced insulin sensitivity in ATP2B1-silenced endothelial cells is alternatively dependent on an increase in intracellular Ca2+ and the subsequent activation of the Ca2+/calmodulin/eNOS/Akt signaling pathway. In summary, ATP2B1 gene silencing increased insulin sensitivity in endothelial cells by directly modulating the Ca2+/calmodulin signaling pathway and via the Ca2+/calmodulin/eNOS/Akt signaling pathway alternatively.
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Affiliation(s)
- Yang Long
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China.,Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Ji-Yi Xia
- Key Laboratory of Medical Electrophysiology of Ministry of Education, Collaborative Innovation Center for Prevention and Treatment of Cardiovascular Disease, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Shao-Wei Chen
- Medical Reproduction Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Chen-Lin Gao
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Guan-Nan Liang
- Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Xue-Mei He
- Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Jian Wu
- Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Chun-Xia Jiang
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Xin Liu
- Laboratory of Endocrinology, Experimental Medicine Center, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Wei Huang
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Qin Wan
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China
| | - Yong Xu
- Department of Endocrinology, The Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, P R China.,Key Laboratory of Medical Electrophysiology of Ministry of Education, Collaborative Innovation Center for Prevention and Treatment of Cardiovascular Disease, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, 646000, Sichuan, P R China
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Bessette C, Benoit B, Sekkal S, Bruno J, Estienne M, Léonil J, Ferrier L, Théodorou V, Plaisancié P. Protective effects of β-casofensin, a bioactive peptide from bovine β-casein, against indomethacin-induced intestinal lesions in rats. Mol Nutr Food Res 2016; 60:823-33. [PMID: 26719048 DOI: 10.1002/mnfr.201500680] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 12/11/2015] [Accepted: 12/14/2015] [Indexed: 01/06/2023]
Abstract
SCOPE β-casofensin, also known as peptide β-CN(94-123), is a milk bioactive peptide that modulates the intestinal barrier through its action on goblet cells. Here, we evaluated whether oral administration of β-casofensin can prevent indomethacin-induced injury of the jejunum in rats. METHODS AND RESULTS Rats received β-casofensin (0.01-100 μM) or tap water by daily gavage (4 μL/g) for eight days, then two subcutaneous injections of indomethacin (10 mg/kg, days 9 and 10) and were euthanized on day 12. In vitro, we investigated the effects of β-casofensin on the restitution of a wounded monolayer. Preventive administration of β-casofensin (100 μM) reduced intestinal macroscopic and microscopic damage induced by indomethacin. β-casofensin also prevented the depletion of goblet cells and increased myeloperoxidase activity, as well as tumor necrosis factor-ɑ (TNF-ɑ) expression and immunostaining of active caspase-3 in the jejunum of rats treated with indomethacin. In wound healing experiments, β-casofensin promoted epithelial restitution with no effect on cell proliferation. This effect was inhibited by pre-incubation with an anti-CC chemokine receptor 6 (CCR6) neutralizing antibody. CONCLUSIONS β-casofensin exerts protective effects in indomethacin-induced enteritis through preservation of goblet cells and improvement in wound healing. β-casofensin could therefore become vital in nutritional programs for the prevention of intestinal diseases.
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Affiliation(s)
- Claudine Bessette
- INRA, UMR1397, Université Lyon 1, INSERM U1060, INSA-Lyon, CarMeN Laboratory, Villeurbanne, France
| | - Bérengère Benoit
- INRA, UMR1397, Université Lyon 1, INSERM U1060, INSA-Lyon, CarMeN Laboratory, Villeurbanne, France
| | - Soraya Sekkal
- INRA, UMR1331 Toxalim, Group of Neuro-Gastroenterology and Nutrition, Toulouse, France
| | - Jérémie Bruno
- INRA, UMR1397, Université Lyon 1, INSERM U1060, INSA-Lyon, CarMeN Laboratory, Villeurbanne, France
| | - Monique Estienne
- INRA, UMR1397, Université Lyon 1, INSERM U1060, INSA-Lyon, CarMeN Laboratory, Villeurbanne, France
| | - Joelle Léonil
- INRA, UMR1253 Science et Technologie du Lait et de l'Œuf, AGROCAMPUS OUEST, Rennes, France
| | - Laurent Ferrier
- INRA, UMR1331 Toxalim, Group of Neuro-Gastroenterology and Nutrition, Toulouse, France
| | - Vassilia Théodorou
- INRA, UMR1331 Toxalim, Group of Neuro-Gastroenterology and Nutrition, Toulouse, France
| | - Pascale Plaisancié
- INRA, UMR1397, Université Lyon 1, INSERM U1060, INSA-Lyon, CarMeN Laboratory, Villeurbanne, France
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Namba T, Kodama R, Moritomo S, Hoshino T, Mizushima T. Zidovudine, an anti-viral drug, resensitizes gemcitabine-resistant pancreatic cancer cells to gemcitabine by inhibition of the Akt-GSK3β-Snail pathway. Cell Death Dis 2015; 6:e1795. [PMID: 26111057 PMCID: PMC4669843 DOI: 10.1038/cddis.2015.172] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 05/11/2015] [Accepted: 05/27/2015] [Indexed: 12/11/2022]
Abstract
Pancreatic cancer is one of the most difficult malignancies to treat owing to the rapid acquisition of resistance to chemotherapy. Gemcitabine, a first-line treatment for pancreatic cancer, prolongs patient survival by several months, and combination treatment with gemcitabine and other anti-cancer drugs in the clinic do not show any significant effects on overall survival. Thus, identification of a drug that resensitizes gemcitabine-resistant pancreatic cancer to gemcitabine and a better understanding of the molecular mechanisms of gemcitabine resistance are critical to develop new therapeutic options for pancreatic cancer. Here, we report that zidovudine resensitizes gemcitabine-resistant pancreatic cancer to gemcitabine as shown by screening a compound library, including clinical medicine, using gemcitabine-resistant cells. In analyzing the molecular mechanisms of zidovudine effects, we found that the epithelial-to-mesenchymal transition (EMT)-like phenotype and downregulation of human equilibrative nucleoside transporter 1 (hENT1) are essential for the acquisition of gemcitabine resistance, and zidovudine restored these changes. The chemical biology investigations also revealed that activation of the Akt-GSK3β-Snail1 pathway in resistant cells is a key signaling event for gemcitabine resistance, and zidovudine resensitized resistant cells to gemcitabine by inhibiting this activated pathway. Moreover, our in vivo study demonstrated that co-administration of zidovudine and gemcitabine strongly suppressed the formation of tumors by gemcitabine-resistant pancreatic cancer and prevented gemcitabine-sensitive pancreatic tumors from acquiring gemcitabine-resistant properties, inducing an EMT-like phenotype and downregulating hENT1 expression. These results suggested that co-treatment with zidovudine and gemcitabine may become a novel therapeutic strategy for pancreatic cancer by inhibiting chemoresistance-specific signaling.
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Affiliation(s)
- T Namba
- Science Research Center, Kochi University, Kochi 783-8505, Japan
| | - R Kodama
- Science Research Center, Kochi University, Kochi 783-8505, Japan
| | - S Moritomo
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
| | - T Hoshino
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo 105-8512, Japan
| | - T Mizushima
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo 105-8512, Japan
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Tissue invasion and metastasis: Molecular, biological and clinical perspectives. Semin Cancer Biol 2015; 35 Suppl:S244-S275. [PMID: 25865774 DOI: 10.1016/j.semcancer.2015.03.008] [Citation(s) in RCA: 336] [Impact Index Per Article: 37.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 03/17/2015] [Accepted: 03/18/2015] [Indexed: 12/12/2022]
Abstract
Cancer is a key health issue across the world, causing substantial patient morbidity and mortality. Patient prognosis is tightly linked with metastatic dissemination of the disease to distant sites, with metastatic diseases accounting for a vast percentage of cancer patient mortality. While advances in this area have been made, the process of cancer metastasis and the factors governing cancer spread and establishment at secondary locations is still poorly understood. The current article summarizes recent progress in this area of research, both in the understanding of the underlying biological processes and in the therapeutic strategies for the management of metastasis. This review lists the disruption of E-cadherin and tight junctions, key signaling pathways, including urokinase type plasminogen activator (uPA), phosphatidylinositol 3-kinase/v-akt murine thymoma viral oncogene (PI3K/AKT), focal adhesion kinase (FAK), β-catenin/zinc finger E-box binding homeobox 1 (ZEB-1) and transforming growth factor beta (TGF-β), together with inactivation of activator protein-1 (AP-1) and suppression of matrix metalloproteinase-9 (MMP-9) activity as key targets and the use of phytochemicals, or natural products, such as those from Agaricus blazei, Albatrellus confluens, Cordyceps militaris, Ganoderma lucidum, Poria cocos and Silybum marianum, together with diet derived fatty acids gamma linolenic acid (GLA) and eicosapentanoic acid (EPA) and inhibitory compounds as useful approaches to target tissue invasion and metastasis as well as other hallmark areas of cancer. Together, these strategies could represent new, inexpensive, low toxicity strategies to aid in the management of cancer metastasis as well as having holistic effects against other cancer hallmarks.
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Chiou SK, Hoa N, Hodges A, Ge L, Jadus MR. Indomethacin promotes apoptosis in gastric cancer cells through concomitant degradation of Survivin and Aurora B kinase proteins. Apoptosis 2015; 19:1378-88. [PMID: 24874838 DOI: 10.1007/s10495-014-1002-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Regular usage of nonsteroidal anti-inflammatory drugs (NSAIDs) is associated with reduced incidence of a variety of cancers. The molecular mechanisms underlying these chemopreventive effects remain poorly understood. This current investigation showed that in gastric cancer cells: (1) Indomethacin treatment enhanced the degradation of chromosomal passenger proteins, Survivin and Aurora B kinase; (2) Indomethacin treatment down-regulated Aurora B kinase activity in a cell cycle-independent fashion; (3) siRNA knockdown of Survivin level promoted Aurora B kinase protein degradation, and vice versa; (4) ectopic overexpression of Survivin blocked reduction of Aurora B kinase level and activity by indomethacin treatment, and vice versa; (5) siRNA knockdown of Aurora B kinase level and AZD1152 inhibition of its activity induced apoptosis, and overexpression of Aurora B kinase inhibited indomethacin-induced apoptosis; (6) indomethacin treatment reduced Aurora B kinase level, coinciding with reduction of Survivin level and induction of apoptosis, in KATO III and HT-29 cells, and in mouse gastric mucosa. A role for Aurora B kinase function in NSAID-induced apoptosis was not previously explored. Thus this report provides better understanding of the molecular mechanisms underlying the anti-cancer effect of NSAIDs by elucidating a significant role for Aurora B kinase in indomethacin-induced apoptosis.
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Affiliation(s)
- Shiun-Kwei Chiou
- Department of Veterans Affairs Medical Center, 5901 E 7th st., Long Beach, CA, 90822-5201, USA,
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Hwang TL, Changchien TT, Wang CC, Wu CM. Claudin-4 expression in gastric cancer cells enhances the invasion and is associated with the increased level of matrix metalloproteinase-2 and -9 expression. Oncol Lett 2014; 8:1367-1371. [PMID: 25120725 PMCID: PMC4114660 DOI: 10.3892/ol.2014.2295] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 06/12/2014] [Indexed: 01/13/2023] Open
Abstract
Claudin-4 is a member of a large family of transmembrane proteins known as claudins, which are essential for the formation and maintenance of tight junctions. Our previous studies have revealed that claudin-4 proteins are overexpressed in metastatic gastric cancer. To clarify the roles of claudin-4 in gastric cancer metastasis, human gastric adenocarcinoma (AGS) cells constitutively expressing wild-type claudin-4 were generated. Expression of claudin-4 in AGS cells was found to increase cell invasion and migration, as measured by Boyden invasion chamber assays. Moreover, the claudin-4-expressing AGS cells were found to have increased matrix metalloproteinase (MMP)-2 and -9 expression, indicating that claudin-mediated increased invasion may be mediated through the activation of the MMP protein. Overall, the results suggest that claudin-4 overexpression may promote gastric cancer metastasis through the increased invasion of gastric cancer cells.
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Affiliation(s)
- Tsann-Long Hwang
- Department of Surgery, Chang Gung Memorial Hospital, Tao-Yuan 33305, Taiwan, R.O.C. ; Department of Surgery, School of Medicine, Chang Gung University, Tao-Yuan 33302, Taiwan, R.O.C
| | - Tzu-Tsung Changchien
- Department of Cosmetic Science, Vanung University, Tao-Yuan 32061, Taiwan, R.O.C
| | - Chee-Chan Wang
- Department of Cosmetic Science, Vanung University, Tao-Yuan 32061, Taiwan, R.O.C
| | - Chi-Ming Wu
- Department of Cosmetic Science, Vanung University, Tao-Yuan 32061, Taiwan, R.O.C
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Iravani O, Tay BWR, Chua PJ, Yip GWC, Bay BH. Claudins and gastric carcinogenesis. Exp Biol Med (Maywood) 2013; 238:344-9. [PMID: 23759999 DOI: 10.1177/1535370213477981] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Gastric carcinoma arises from aberrant growth of normal gastric mucosa. There is increasing evidence that claudins (CLDNs) may play a critical role in the significant steps of gastric tumorigenesis, from metaplasia to metastasis. The CLDN family which consists of at least 27 member proteins is known to mediate selective permeability in cellular tight junctions. It is now established that CLDNs are differentially altered in gastric cancer and CLDN proteins are believed to play different roles in the growth and progression of gastric cancer.
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Affiliation(s)
- Omid Iravani
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore.
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12
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Mizushima T. [Identification of a molecular mechanism for actions of existing medicines and its application for drug development]. YAKUGAKU ZASSHI 2013; 132:713-20. [PMID: 22687730 DOI: 10.1248/yakushi.132.713] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
As a new strategy for drug discovery and development, we propose here the establishment of drug re-profiling strategy. In this strategy, the actions of existing medicines, whose safety and pharmacokinetic effects in humans have been confirmed already, are examined comprehensively at the molecular level and the results are used for the development of new medicines. For example, identification of the mechanisms underlying the side effects of medicines enables us to develop safer drugs. The results can also be used for developing existing drugs for use as medicines in treatment of other diseases. Promoting this research strategy could provide breakthroughs in drug discovery and development by pharmaceutical companies.
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Affiliation(s)
- Tohru Mizushima
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan.
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Watari A, Yagi K, Kondoh M. A simple reporter assay for screening claudin-4 modulators. Biochem Biophys Res Commun 2012; 426:454-60. [PMID: 22960168 DOI: 10.1016/j.bbrc.2012.08.083] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Accepted: 08/16/2012] [Indexed: 01/09/2023]
Abstract
Claudin-4, a member of a tetra-transmembrane protein family that comprises 27 members, is a key functional and structural component of the tight junction-seal in mucosal epithelium. Modulation of the claudin-4-barrier for drug absorption is now of research interest. Disruption of the claudin-4-seal occurs during inflammation. Therefore, claudin-4 modulators (repressors and inducers) are promising candidates for drug development. However, claudin-4 modulators have never been fully developed. Here, we attempted to design a screening system for claudin-4 modulators by using a reporter assay. We prepared a plasmid vector coding a claudin-4 promoter-driven luciferase gene and established stable reporter gene-expressing cells. We identified thiabendazole, carotene and curcumin as claudin-4 inducers, and potassium carbonate as a claudin-4 repressor by using the reporter cells. They also increased or decreased, respectively, the integrity of the tight junction-seal in Caco-2 cells. This simple reporter system will be a powerful tool for the development of claudin-4 modulators.
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Affiliation(s)
- Akihiro Watari
- Laboratory of Bio-Functional Molecular Chemistry, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
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Tanaka KI, Shirai A, Ito Y, Namba T, Tahara K, Yamakawa N, Mizushima T. Expression of 150-kDa oxygen-regulated protein (ORP150) stimulates bleomycin-induced pulmonary fibrosis and dysfunction in mice. Biochem Biophys Res Commun 2012; 425:818-24. [PMID: 22892132 DOI: 10.1016/j.bbrc.2012.07.158] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 07/28/2012] [Indexed: 11/29/2022]
Abstract
Idiopathic pulmonary fibrosis (IPF) involves pulmonary injury associated with inflammatory responses, fibrosis and dysfunction. Myofibroblasts and transforming growth factor (TGF)-β1 play major roles in the pathogenesis of this disease. Endoplasmic reticulum (ER) stress response is induced in the lungs of IPF patients. One of ER chaperones, the 150-kDa oxygen-regulated protein (ORP150), is essential for the maintenance of cellular viability under stress conditions. In this study, we used heterozygous ORP150-deficient mice (ORP150(+/-) mice) to examine the role of ORP150 in bleomycin-induced pulmonary fibrosis. Treatment of mice with bleomycin induced the expression of ORP150 in the lung. Bleomycin-induced inflammatory responses were slightly exacerbated in ORP150(+/-) mice compared to wild-type mice. On the other hand, bleomycin-induced pulmonary fibrosis, alteration of lung mechanics and respiratory dysfunction was clearly ameliorated in the ORP150(+/-) mice. Bleomycin-induced increases in pulmonary levels of both active TGF-β1 and myofibroblasts were suppressed in ORP150(+/-) mice. These results suggest that although ORP150 is protective against bleomycin-induced lung injury, this protein could stimulate bleomycin-induced pulmonary fibrosis by increasing pulmonary levels of TGF-β1 and myofibroblasts.
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Affiliation(s)
- Ken-Ichiro Tanaka
- Department of Analytical Chemistry, Faculty of Pharmacy, Keio University, Tokyo 105-8512, Japan
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15
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Okugawa T, Oshima T, Chen X, Hori K, Tomita T, Fukui H, Watari J, Matsumoto T, Miwa H. Down-regulation of claudin-3 is associated with proliferative potential in early gastric cancers. Dig Dis Sci 2012; 57:1562-7. [PMID: 22290341 DOI: 10.1007/s10620-012-2043-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Accepted: 01/04/2012] [Indexed: 12/13/2022]
Abstract
BACKGROUND Claudins are tight junction (TJ) proteins, and the relationship between the level of expression and localization of TJ protein, and tumor aggressiveness in early gastric cancer (GC) is still far from clear. AIMS To investigate the expression of claudins and Ki-67 in early GC cells and surrounding normal gastric mucosa. METHODS A total of 53 early GC lesions removed via endoscopic mucosal resection or endoscopic submucosal resection were evaluated. All of the GCs were characterized as well to moderately differentiated adenocarcinoma. The labeling index (LI) of Ki-67 was calculated for each sample. To assess the prevalence of epithelial TJs, immunofluorescent staining for claudin-3, claudin-4, and claudin-7 was performed. The immunoreactivity was graded according to the percentage of stained cells. RESULTS Claudin-3, claudin-4, and claudin-7 expression at TJs in GC and intestinal metaplasia were significantly higher than that in gastric mucosa with no intestinal metaplasia. The Ki-67 LI of GC specimens was inversely correlated with claudin-3 expression, but not with claudin-4 or claudin-7 expression. Claudin-3 expression was significantly lower at the submucosal invasive front of GCs. CONCLUSIONS The down-regulation of claudin-3 was associated with the proliferative potential of GC cells, indicating that claudins may have a pivotal role in the progression of GC.
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Affiliation(s)
- Takuya Okugawa
- Division of Upper Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
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Yamashita Y, Ikeda T, Matsuda M, Maji D, Hoshino T, Mizushima T. Purification and characterization of HSP-inducers from Eupatorium lindleyanum. Biochem Pharmacol 2012; 83:909-22. [DOI: 10.1016/j.bcp.2011.12.040] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Revised: 12/28/2011] [Accepted: 12/29/2011] [Indexed: 12/14/2022]
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Ikari A, Atomi K, Takiguchi A, Yamazaki Y, Hayashi H, Hirakawa J, Sugatani J. Enhancement of cell-cell contact by claudin-4 in renal epithelial madin-darby canine kidney cells. J Cell Biochem 2012; 113:499-507. [DOI: 10.1002/jcb.23373] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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Claudin-4 overexpression is associated with epigenetic derepression in gastric carcinoma. J Transl Med 2011; 91:1652-67. [PMID: 21844869 DOI: 10.1038/labinvest.2011.117] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The tight junction (TJ) protein claudin-4 is aberrantly upregulated in gastric cancer, but its clinical significance and the molecular mechanisms underlying claudin-4 overexpression in gastric cancer remain unclear. Here, we investigated its roles and epigenetic mechanisms regulating CLDN4 expression in gastric cancer. We show that increased membranous expression of claudin-4 in gastric carcinoma is associated with better patient prognosis, whereas cytoplasmic claudin-4 expression did not show a significant association with prognosis. Consistent with the correlation of increased membranous claudin-4 with favorable clinicopathological factors, claudin-4 overexpression inhibited the migration and invasion of gastric cancer cells; in contrast, it did not affect cell growth. Claudin-4 expression also increased the barrier function of TJs. Claudin-4 upregulation was strongly correlated with DNA hypomethylation in both gastric tissues and gastric cancer cells. Moreover, CLDN4 expression was repressed in normal gastric tissues in association with bivalent histone modifications, and loss of repressive histone methylations and gain of active histone modifications were associated with CLDN4 overexpression in gastric cancer cells. Interestingly, CLDN4 repression could be markedly derepressed by combined treatments that simultaneously target both histone modifications and DNA demethylation in CLDN4-hypermethylated cells, whereas concomitant changes in histone methylations and acetylations are required for CLDN4 induction in CLDN4-repressed cells with low DNA methylation. Taken together, this study reveals that membranous claudin-4 expression is associated with gastric cancer progression and that it is an independent positive prognosis marker in gastric carcinoma. Furthermore, our findings suggest that epigenetic derepression may be a possible mechanism underlying CLDN4 overexpression in gastric cancer and that claudin-4 may have potential as a promising target for the treatment of gastric cancer.
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Ma D, Zhang LM. Supramolecular Gelation of a Polymeric Prodrug for Its Encapsulation and Sustained Release. Biomacromolecules 2011; 12:3124-30. [DOI: 10.1021/bm101566r] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dong Ma
- DSAPM Lab and PCFM Lab, Institute of Polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China
| | - Li-Ming Zhang
- DSAPM Lab and PCFM Lab, Institute of Polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China
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20
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Suppression of Alzheimer's disease-related phenotypes by expression of heat shock protein 70 in mice. J Neurosci 2011; 31:5225-34. [PMID: 21471357 DOI: 10.1523/jneurosci.5478-10.2011] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Amyloid-β peptide (Aβ) plays an important role in the pathogenesis of Alzheimer's disease (AD). Aβ is generated by proteolysis of β-amyloid precursor protein (APP) and is cleared by enzyme-mediated degradation and phagocytosis by microglia and astrocytes. Some cytokines, such as TGF-β1, stimulate this phagocytosis. In contrast, cellular upregulation of HSP70 expression provides cytoprotection against Aβ. HSP70 activity in relation to inhibition of Aβ oligomerization and stimulation of Aβ phagocytosis has also been reported. Although these in vitro results suggest that stimulating the expression of HSP70 could prove effective in the treatment of AD, there is a lack of in vivo evidence supporting this notion. In this study, we address this issue, using transgenic mice expressing HSP70 and/or a mutant form of APP (APPsw). Transgenic mice expressing APPsw showed less of an apparent cognitive deficit when they were crossed with transgenic mice expressing HSP70. Transgenic mice expressing HSP70 also displayed lower levels of Aβ, Aβ plaque deposition, and neuronal and synaptic loss than control mice. Immunoblotting experiments and direct measurement of β- and γ-secretase activity suggested that overexpression of HSP70 does not affect the production Aβ. In contrast, HSP70 overexpression did lead to upregulation of the expression of Aβ-degrading enzyme and TGF-β1 both in vivo and in vitro. These results suggest that overexpression of HSP70 in mice suppresses not only the pathological but also the functional phenotypes of AD. This study provides the first in vivo evidence confirming the potential therapeutic benefit of HSP70 for the prevention or treatment of AD.
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Abstract
β-(1,3)-d-Glucan with β-(1,6) branches has been reported to have various pharmacological activities, such as anti-tumour and anti-infection activities, which result from its immunomodulating effects. Gastric lesions result from an imbalance between aggressive and defensive factors. In the present study, we examined the effect of β-(1,3)-d-glucan with β-(1,6) branches isolated fromAureobasidium pullulanson the gastric ulcerogenic response in mice. Oral administration of β-glucan ameliorated gastric lesions induced by ethanol (EtOH) or HCl. This administration of β-glucan also suppressed EtOH-induced inflammatory responses, such as infiltration of neutrophils and expression of pro-inflammatory cytokines, chemokines and cell adhesion molecules (CAM) at the gastric mucosa. Of the various defensive factors, the levels of heat shock protein (HSP) 70 and mucin but not PGE2were increased by the administration of β-glucan. β-Glucan-dependent induction of the expression of HSP70 and mucin proteins and suppression of the expression of pro-inflammatory cytokines, chemokines and CAM were also observed in cultured cellsin vitro.The results of the present study suggest that β-glucan protects the gastric mucosa from the formation of irritant-induced lesions by increasing the levels of defensive factors, such as HSP70 and mucin.
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Mizushima T. Drug discovery and development focusing on existing medicines: drug re-profiling strategy. J Biochem 2011; 149:499-505. [PMID: 21436140 DOI: 10.1093/jb/mvr032] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
As a new strategy for drug discovery and development, I focus on drug re-profiling as a way to identify new treatments for diseases. In this strategy, the actions of existing medicines, whose safety and pharmacokinetic effects in humans have already been confirmed clinically and approved for use, are examined comprehensively at the molecular level and the results used for the development of new medicines. This strategy is based on the fact that we still do not understand the underlying mechanisms of action of many existing medicines, and as such the cellular responses that give rise to their main effects and side effects are yet to be elucidated. To this extent, identification of the mechanisms underlying the side effects of medicines offers a means for us to develop safer drugs. The results can also be used for developing existing drugs for use as medicines for the treatment of other diseases. Promoting this research strategy could provide breakthroughs in drug discovery and development.
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Affiliation(s)
- Tohru Mizushima
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan.
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Zavala-Zendejas VE, Torres-Martinez AC, Salas-Morales B, Fortoul TI, Montaño LF, Rendon-Huerta EP. Claudin-6, 7, or 9 overexpression in the human gastric adenocarcinoma cell line AGS increases its invasiveness, migration, and proliferation rate. Cancer Invest 2010; 29:1-11. [PMID: 20874001 DOI: 10.3109/07357907.2010.512594] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Altered claudin expression is related to metastatic potential, poor prognosis, or tumor recurrence. We analyzed if the overexpression of claudin-6, claudin-7, or claudin-9 in AGS cells altered cell motility, invasiveness, or proliferation rate. Claudin-7, claudin-9, and claudin-6 enhanced their invasive potential by 3.4-fold, 1.6-fold, and 2.0-fold, respectively. Claudin-6 and claudin-9 enhanced cell migration, while the proliferation rate of claudin-6-, claudin-7-, and claudin-9-transfected cells increased by 12.7%, 9.0%, and 13.3%, respectively. Claudin-7 and claudin-9 overexpression increased claudin-1 and zonula occludens-1 levels. In summary, individual increased expression of claudin-6, claudin-7, or claudin-9 is sufficient to enhance tumorigenic properties of a gastric adenocarcinoma cell line.
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Tanaka KI, Tanaka Y, Namba T, Azuma A, Mizushima T. Heat shock protein 70 protects against bleomycin-induced pulmonary fibrosis in mice. Biochem Pharmacol 2010; 80:920-31. [PMID: 20513440 DOI: 10.1016/j.bcp.2010.05.025] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 05/24/2010] [Accepted: 05/24/2010] [Indexed: 01/29/2023]
Abstract
Idiopathic pulmonary fibrosis (IPF) involves infiltration of leucocytes, pulmonary injury, fibrosis and resulting pulmonary dysfunction. Myofibroblasts and transforming growth factor (TGF)-beta1 have been suggested to play a major role in the pathology and the myofibroblasts are derived from both lung epithelial cells through epithelial-mesenchymal transition (EMT) and activation of lung fibroblasts. Heat shock protein 70 (HSP70) confers protection against various stressors and has the anti-inflammatory activity. In this study, we examined the effect of expression of HSP70 on bleomycin-induced pulmonary fibrosis in mice, a tentative animal model of IPF. Bleomycin-induced pulmonary injury and inflammatory response were ameliorated in transgenic mice overexpressing HSP70 compared to wild-type mice, even though bleomycin-induced pulmonary fibrosis and dysfunction were also suppressed in the transgenic mice. The production of TGF-beta1 and expression of pro-inflammatory cytokines was lower in cells from the transgenic mice than wild-type mice after the administration of bleomycin. In vitro, the suppression of HSP70 expression stimulated TGF-beta1-induced EMT-like phenotypes of epithelial cells but did not affect the TGF-beta1-dependent activation of fibroblasts. Orally administered geranylgeranylacetone (GGA), a clinically used drug with HSP-inducing activity, conferred protection against bleomycin-induced pulmonary injury, as well as against the inflammatory response, fibrosis and dysfunction. These results suggest that HSP70 plays a protective role against bleomycin-induced pulmonary injury, inflammation, fibrosis and dysfunction through cytoprotective effects and by inhibiting the production of TGF-beta1, TGF-beta1-dependent EMT of epithelial cells and expression of pro-inflammatory cytokines. Results also suggest that HSP70-inducing drugs, such as GGA, could be beneficial in the prophylaxis of IPF.
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Affiliation(s)
- Ken-Ichiro Tanaka
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862-0973, Japan
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25
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Mizushima T. Molecular Mechanism for Various Pharmacological Activities of NSAIDS. Pharmaceuticals (Basel) 2010; 3:1614-1636. [PMID: 27713320 PMCID: PMC4034000 DOI: 10.3390/ph3051614] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Revised: 04/29/2010] [Accepted: 05/11/2010] [Indexed: 12/21/2022] Open
Abstract
The anti-inflammatory action of non-steroidal anti-inflammatory drugs (NSAIDs) is mediated through their inhibitory effects on cyclooxygenase (COX) activity. On the other hand, NSAID use is often associated with gastrointestinal complications. The inhibition of COX by NSAIDs is not the sole explanation for the gastrointestinal side effects of NSAIDs. Furthermore, recent epidemiological studies have revealed that prolonged NSAID use reduces the risk of cancer and Alzheimer’s disease (AD) and a COX-independent unknown mechanism is suggested to be involved in these activities of NSAIDs. In this article, I review our recent work on the COX-independent mechanism involved in NSAID-induced gastric lesions and anti-tumor and anti-AD activities of NSAIDs. Using DNA microarray analysis, we found that NSAIDs affect expression of various genes in a COX-independent manner. We found that membrane permeabilization activity of NSAIDs and resulting NSAID-induced apoptosis are involved in NSAID-induced gastric lesions. On the other hand, induction of expression of tight junction-related genes and endoplasmic reticulum chaperones were suggested to be involved in anti-tumor and anti-AD, respectively, activities of NSAIDs. These results suggest that NSAIDs affect expression of various genes in a COX-independent manner, which is involved in various pharmacological activities of NSAIDs.
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Affiliation(s)
- Tohru Mizushima
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862-0973, Japan.
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26
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Induction of EMT-like phenotypes by an active metabolite of leflunomide and its contribution to pulmonary fibrosis. Cell Death Differ 2010; 17:1882-95. [PMID: 20489727 DOI: 10.1038/cdd.2010.64] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Drug-induced interstitial lung disease (ILD), particularly pulmonary fibrosis, is a serious clinical concern and myofibroblasts have been suggested to have a major role, with it recently being revealed that some of these myofibroblasts are derived from lung epithelial cells through epithelial-mesenchymal transition (EMT). In this study, we examined the EMT-inducing abilities of drugs known to induce ILD clinically. EMT-like phenotypes were induced by A771726, an active metabolite of leflunomide having an inhibitory effect on dihydroorotate dehydrogenase (DHODH). Smad-interacting protein 1 (a transcription factor regulating EMT) and the Notch-signaling pathway but not transforming growth factor-β was shown to be involved in A771726-induced EMT-like phenotypes. When the cultures were supplemented with exogenous uridine, the A771726-induced EMT-like phenotypes and activation of the Notch-signaling pathway disappeared. Similarly, an A771726 analog without inhibitory activity on DHODH produced no induction, suggesting that this process is mediated through the inhibition of DHODH. In vivo, administration of leflunomide stimulated bleomycin-induced EMT-like phenomenon in pulmonary tissue, and exacerbated bleomycin-induced pulmonary fibrosis, both of which were suppressed by coadministration of uridine. Taken together, these findings suggest that leflunomide-dependent exacerbation of bleomycin-induced pulmonary fibrosis is mediated by stimulation of EMT of lung epithelial cells, providing the first evidence that drug-induced pulmonary fibrosis involves EMT of these cells.
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Saeki R, Kondoh M, Kakutani H, Matsuhisa K, Takahashi A, Suzuki H, Kakamu Y, Watari A, Yagi K. A claudin-targeting molecule as an inhibitor of tumor metastasis. J Pharmacol Exp Ther 2010; 334:576-82. [PMID: 20442222 DOI: 10.1124/jpet.110.168070] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Tumor metastasis of epithelium-derived tumors is the major cause of death from malignant tumors. Overexpression of claudin is observed frequently in malignant tumors. However, claudin-targeting antimetastasis therapy has never been investigated. We previously prepared a claudin-4-targeting antitumor molecule that consisted of the C-terminal fragment of Clostridium perfringens enterotoxin (C-CPE) fused to protein synthesis inhibitory factor (PSIF) derived from Pseudomonas exotoxin. In the present study, we investigated whether claudin CPE receptors can be a target for tumor metastasis by using the C-CPE-fused PSIF as a claudin-targeting agent. One of the most popular murine metastasis models is the lung metastasis of intravenously injected B16 cells. Therefore, we first investigated the effects of the C-CPE-fused PSIF on lung metastasis of claudin-4-expressing B16 (CL4-B16) cells. Intravenous administration of the C-CPE-fused PSIF suppressed lung metastasis of CL4-B16 cells but not B16 cells. Injection of C-CPE-fused PSIF also inhibited tumor growth and spontaneous lung metastasis of murine breast cancer 4T1 cells inoculated into the subcutis. Treatment with C-CPE-fused PSIF did not show apparent side effects in mice. These findings indicate that claudin targeting may be a novel strategy for inhibiting some tumor metastases.
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Affiliation(s)
- Rie Saeki
- Laboratory of Bio-Functional Molecular Chemistry, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan
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Machado ER, Carlos D, Lourenço EV, Souza GEP, Sorgi CA, Silva EV, Ueta MT, Ramos SG, Aronoff DM, Faccioli LH. Cyclooxygenase-derived mediators regulate the immunological control of Strongyloides venezuelensis infection. ACTA ACUST UNITED AC 2010; 59:18-32. [PMID: 20236322 DOI: 10.1111/j.1574-695x.2010.00656.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The aim of this study was to define the immunoregulatory role of prostaglandins in a mouse model of Strongyloides venezuelensis infection. Strongyloides venezuelensis induced an increase of eosinophils and mononuclear cells in the blood, peritoneal cavity fluid, and bronchoalveolar lavage fluid. Treatment with the dual cyclooxygenase (COX-1/-2) inhibitors indomethacin and ibuprofen, and the COX-2-selective inhibitor celecoxib partially blocked these cellular responses and was associated with enhanced numbers of infective larvae in the lung and adult worms in the duodenum. However, the drugs did not interfere with worm fertility. Cyclooxygenase inhibitors also inhibited the production of the T-helper type 2 (Th2) mediators IL-5, IgG1, and IgE, while indomethacin alone also inhibited IL-4, IL-10, and IgG2a. Cyclooxygenase inhibitors tended to enhance the Th1 mediators IL-12 and IFN-gamma. This shift away from Th2 immunity in cyclooxygenase inhibitor-treated mice correlated with reduced prostaglandin E(2) (PGE(2)) production in infected duodenal tissue. As PGE(2) is a well-characterized driver of Th2 immunity, we speculate that reduced production of this lipid might be involved in the shift toward a Th1 phenotype, favoring parasitism by S. venezuelensis. These findings provide new evidence that cyclooxygenase-derived lipids play a role in regulating host defenses against Strongyloides, and support the exploration of eicosanoid signaling for identifying novel preventive and therapeutic modalities against these infections.
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Affiliation(s)
- Eleuza R Machado
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil.
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Lee JW, Hsiao WT, Chen HY, Hsu LP, Chen PR, Lin MD, Chiu SJ, Shih WL, Hsu YC. Upregulated claudin-1 expression confers resistance to cell death of nasopharyngeal carcinoma cells. Int J Cancer 2010; 126:1353-66. [PMID: 19739116 DOI: 10.1002/ijc.24857] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Accumulating evidence reveals that aberrant expression of claudins manifests in various tumors; however, their biological functions are poorly understood. Here, we report on the elevated expression of claudin-1 in nasopharyngeal carcinoma (NPC) cell lines under serum deprivation or fluorouracil (5-FU) treatment. Interestingly, an increase in expression of claudin-1 considerably reduced apoptosis rather than enhancing cell proliferation. However, claudin-1 expression and activity were unaffected by external stimuli or Akt and NF-kappaB activation. Notably, predominant cytoplasmic and nuclear localization of claudin-1 in NPC cells reflected the aforementioned feature. On the other hand, loss of epithelial morphology and E-cadherin expression was associated with serum withdrawal in NPC cells. Interestingly, restoration of E-cadherin inhibited the protein elevation and antiapoptotic activity of claudin-1. In conclusion, our data demonstrate the regulation and novel biological function of claudin-1 and indicate the important role of claudin-1 in NPC tumorigenesis.
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Affiliation(s)
- Jeng-Woei Lee
- Department of Life Sciences, Tzu-Chi University, Hualien 97004, Taiwan.
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Hoshino T, Matsuda M, Yamashita Y, Takehara M, Fukuya M, Mineda K, Maji D, Ihn H, Adachi H, Sobue G, Funasaka Y, Mizushima T. Suppression of melanin production by expression of HSP70. J Biol Chem 2010; 285:13254-63. [PMID: 20177067 DOI: 10.1074/jbc.m110.103051] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Skin hyperpigmentation disorders due to abnormal melanin production induced by ultraviolet (UV) irradiation are both a clinical and cosmetic problem. UV irradiation stimulates melanin production in melanocytes by increasing intracellular cAMP. Expression of heat shock proteins (HSPs), especially HSP70, is induced by various stressors, including UV irradiation, to provide cellular resistance to such stressors. In this study we examined the effect of expression of HSP70 on melanin production both in vitro and in vivo. 3-Isobutyl-1-methylxanthine (IBMX), a cAMP-elevating agent, stimulated melanin production in cultured mouse melanoma cells, and this stimulation was suppressed in cells overexpressing HSP70. IBMX-dependent transcriptional activation of the tyrosinase gene was also suppressed in HSP70-overexpressing cells. Expression of microphthalmia-associated transcription factor (MITF), which positively regulates transcription of the tyrosinase gene, was up-regulated by IBMX; however, this up-regulation was not suppressed in HSP70-overexpressing cells. On the other hand, immunoprecipitation and immunostaining analyses revealed a physical interaction between and co-localization of MITF and HSP70, respectively. Furthermore, the transcription of tyrosinase gene in nuclear extract was inhibited by HSP70. In vivo, UV irradiation of wild-type mice increased the amount of melanin in the basal layer of the epidermis, and this increase was suppressed in transgenic mice expressing HSP70. This study provides the first evidence of an inhibitory effect of HSP70 on melanin production both in vitro and in vivo. This effect seems to be mediated by modulation of MITF activity through a direct interaction between HSP70 and MITF.
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Affiliation(s)
- Tatsuya Hoshino
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
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Tanaka KI, Ishihara T, Azuma A, Kudoh S, Ebina M, Nukiwa T, Sugiyama Y, Tasaka Y, Namba T, Ishihara T, Sato K, Mizushima Y, Mizushima T. Therapeutic effect of lecithinized superoxide dismutase on bleomycin-induced pulmonary fibrosis. Am J Physiol Lung Cell Mol Physiol 2009; 298:L348-60. [PMID: 20034962 DOI: 10.1152/ajplung.00289.2009] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is thought to involve inflammatory infiltration of leukocytes, lung injury induced by reactive oxygen species (ROS), in particular superoxide anion, and fibrosis (collagen deposition). No treatment has been shown to improve definitively the prognosis for IPF patients. Superoxide dismutase (SOD) catalyzes the dismutation of superoxide anion to hydrogen peroxide, which is subsequently detoxified by catalase. Lecithinized SOD (PC-SOD) has overcome clinical limitations of SOD, including low tissue affinity and low stability in plasma. In this study, we examined the effect of PC-SOD on bleomycin-induced pulmonary fibrosis. Severity of the bleomycin-induced fibrosis in mice was assessed by various methods, including determination of hydroxyproline levels in lung tissue. Intravenous administration of PC-SOD suppressed the bleomycin-induced increase in the number of leukocytes in bronchoalveolar lavage fluid. Bleomycin-induced collagen deposition and increased hydroxyproline levels in the lung were also suppressed in animals treated with PC-SOD, suggesting that PC-SOD suppresses bleomycin-induced pulmonary fibrosis. The dose-response profile of PC-SOD was bell-shaped, but concurrent administration of catalase restored the ameliorative effect at high doses of PC-SOD. Intratracheal administration or inhalation of PC-SOD also attenuated the bleomycin-induced inflammatory response and fibrosis. The bell-shaped dose-response profile of PC-SOD was not observed for these routes of administration. We consider that, compared with intravenous administration, inhalation of PC-SOD may be a more therapeutically beneficial route of administration due to the higher safety and quality of life of the patient treated with this drug.
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Affiliation(s)
- Ken-Ichiro Tanaka
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto, Japan
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Tight junctions: a barrier to the initiation and progression of breast cancer? J Biomed Biotechnol 2009; 2010:460607. [PMID: 19920867 PMCID: PMC2777242 DOI: 10.1155/2010/460607] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2009] [Accepted: 08/27/2009] [Indexed: 12/11/2022] Open
Abstract
Breast cancer is a complex and heterogeneous disease that arises from epithelial cells lining the breast ducts and lobules. Correct adhesion between adjacent epithelial cells is important in determining the normal structure and function of epithelial tissues, and there is accumulating evidence that dysregulated cell-cell adhesion is associated with many cancers. This review will focus on one cell-cell adhesion complex, the tight junction (TJ), and summarize recent evidence that TJs may participate in breast cancer development or progression. We will first outline the protein composition of TJs and discuss the functions of the TJ complex. Secondly we will examine how alterations in these functions might facilitate breast cancer initiation or progression; by focussing on the regulatory influence of TJs on cell polarity, cell fate and cell migration. Finally we will outline how pharmacological targeting of TJ proteins may be useful in limiting breast cancer progression. Overall we hope to illustrate that the relationship between TJ alterations and breast cancer is a complex one; but that this area offers promise in uncovering fundamental mechanisms linked to breast cancer progression.
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Suzuki M, Kato-Nakano M, Kawamoto S, Furuya A, Abe Y, Misaka H, Kimoto N, Nakamura K, Ohta S, Ando H. Therapeutic antitumor efficacy of monoclonal antibody against Claudin-4 for pancreatic and ovarian cancers. Cancer Sci 2009; 100:1623-30. [PMID: 19555390 PMCID: PMC11159503 DOI: 10.1111/j.1349-7006.2009.01239.x] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2009] [Revised: 05/18/2009] [Accepted: 05/23/2009] [Indexed: 01/02/2023] Open
Abstract
Claudin-4 (CLDN4) is a tetraspanin transmembrane protein of tight junction structure and is highly expressed in pancreatic and ovarian cancers. In this study, we aimed to generate an anti-Claudin-4 monoclonal antibody (mAb) and evaluate its antitumor efficacy in vitro and in vivo. To isolate specific mAb, we generated CLDN3, 4, 5, 6, and 9, expressing Chinese hamster ovary (CHO) cells, and then used them as positive and negative targets through cell-based screening. As a result, we succeeded in isolating KM3900 (IgG2a), which specifically bound to CLDN4, from BXSB mice immunized with pancreatic cancer cells. Immunoprecipitation and flow cytometry analysis revealed that KM3900 recognized the conformational structure and bound to extracellular loop 2 of CLDN4. Furthermore, binding of KM3900 was detected on CLDN4-expressing pancreatic and ovarian cancer cells, but not on negative cells. Next, we made the mouse-human chimeric IgG1 (KM3934) and evaluated its antitumor efficacy. KM3934 induced dose-dependent antibody-dependent cellular cytotoxicity and complement-dependent cytotoxicity in vitro, and significantly inhibited tumor growth in MCAS or CFPAC-1 xenograft SCID mice in vivo (P < 0.05). These results suggest that mAb therapy against CLDN4 is promising for pancreatic and ovarian cancers.
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Affiliation(s)
- Masayo Suzuki
- Antibody Research Laboratories, Kyowa Hakko Kirin Co., Ltd, Machida-shi, Tokyo, Japan.
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Wray C, Mao Y, Pan J, Chandrasena A, Piasta F, Frank JA. Claudin-4 augments alveolar epithelial barrier function and is induced in acute lung injury. Am J Physiol Lung Cell Mol Physiol 2009; 297:L219-27. [PMID: 19447895 DOI: 10.1152/ajplung.00043.2009] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Intact alveolar barrier function is associated with better outcomes in acute lung injury patients; however, the regulation of alveolar epithelial paracellular transport during lung injury has not been extensively investigated. This study was undertaken to determine whether changes in tight junction claudin expression affect alveolar epithelial barrier properties and to determine the mechanisms of altered expression. In anesthetized mice exposed to ventilator-induced lung injury, claudin-4 was specifically induced among tight junction structural proteins. Real-time PCR showed an eightfold increase in claudin-4 expression in the lung injury model. To examine the role of this protein in barrier regulation, claudin-4 function was inhibited with small interfering RNA (siRNA) and a blocking peptide derived from the binding domain of Clostridium perfringens enterotoxin (CPE(BD)). Inhibition of claudin-4 decreased transepithelial electrical resistance but did not alter macromolecule permeability in primary rat and human epithelial cells. In mice, CPE(BD) decreased air space fluid clearance >33% and resulted in pulmonary edema during moderate tidal volume ventilation that did not induce edema in control peptide-treated mice. In vitro phorbol ester induced a ninefold increase in claudin-4 expression that was dependent on PKC activation and the JNK MAPK pathway. These data establish that changes in alveolar epithelial claudin expression influence paracellular transport, alveolar fluid clearance rates, and susceptibility to pulmonary edema. We hypothesize that increased claudin-4 expression early in acute lung injury represents a mechanism to limit pulmonary edema and that the regulation of alveolar epithelial claudin expression may be a novel target for acute lung injury therapy.
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Namba T, Tanaka KI, Ito Y, Ishihara T, Hoshino T, Gotoh T, Endo M, Sato K, Mizushima T. Positive role of CCAAT/enhancer-binding protein homologous protein, a transcription factor involved in the endoplasmic reticulum stress response in the development of colitis. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 174:1786-98. [PMID: 19359519 DOI: 10.2353/ajpath.2009.080864] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Although recent reports suggest that the endoplasmic reticulum (ER) stress response is induced in association with the development of inflammatory bowel disease, its role in the pathogenesis of inflammatory bowel disease remains unclear. The CCAAT/enhancer-binding protein (C/EBP) homologous protein (CHOP) is a transcription factor that is involved in the ER stress response, especially ER stress-induced apoptosis. In this study, we found that experimental colitis was ameliorated in CHOP-null mice, suggesting that CHOP exacerbates the development of colitis. The mRNA expression of Mac-1 (CD11b, a positive regulator of macrophage infiltration), Ero-1alpha, and Caspase-11 (a positive regulator of interleukin-1beta production) in the intestine was induced with the development of colitis, and this induction was suppressed in CHOP-null mice. ERO-1alpha is involved in the production of reactive oxygen species (ROS); an increase in ROS production, which is associated with the development of colitis in the intestine, was suppressed in CHOP-null mice. A greater number of apoptotic cells in the intestinal mucosa of wild-type mice were observed to accompany the development of colitis compared with CHOP-null mice, suggesting that up-regulation of CHOP expression exacerbates the development of colitis. Furthermore, this CHOP activity appears to involve various stimulatory mechanisms, such as macrophage infiltration via the induction of Mac-1, ROS production via the induction of ERO-1alpha, interleukin-1beta production via the induction of Caspase-11, and intestinal mucosal cell apoptosis.
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Affiliation(s)
- Takushi Namba
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
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Erin N, Wang N, Xin P, Bui V, Weisz J, Barkan GA, Zhao W, Shearer D, Clawson GA. Altered gene expression in breast cancer liver metastases. Int J Cancer 2009; 124:1503-16. [PMID: 19117052 DOI: 10.1002/ijc.24131] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
We previously developed a highly aggressive cell line from heart metastases of 4T1 breast carcinoma (designated 4THM), which produced liver metastases (designated 4TLM). In this study, gene array analysis (GAEA) compared gene expression profiles in 4TLM with profiles in 4T1 and 4THM primary tumors. GAEA demonstrated that 4T1 and 4THM tumors differed in about 250 genes. Over 1,000 genes, however, were expressed differently in 4TLM compared with primary tumors. A cohort of 16 genes showed significantly decreased expression in 4THM tumors, which decreased even further in 4TLM. Many of these genes have been implicated in breast cancer, and many are involved in cell adhesion and junctional complexes. Expression of multiple tight and adherence junction proteins was either downregulated or disappeared in 4TLM; downregulation of claudin 4, claudin 7 and gamma-catenin was confirmed by quantitative polymerase chain reaction, immunoblot, and immunocytochemical (ICC) analyses. At the protein level, intact ZO-1 was also observed in 4T1 tumors, but was not expressed in 4THM or 4TLM tumors. ICC demonstrated expression of gamma-catenin at the plasma membrane with 4T1 tumors, whereas staining appeared to be nuclear/perinuclear in 4THM tumors. Claudin 7 staining was also seen in monocyte/pmacrophage-like cells in liver around metastatic lesions by ICC, and it appeared that larger 4TLM tumors apparently reexpressed claudin 7 RNA and protein. Our results demonstrate that decreased or abnormal expression of a number of cell adhesion/junctional proteins, including claudin 4, 7, ZO-1 and gamma-catenin, correlates with liver metastases, and that cell adhesion molecules in the microenvironment are also altered.
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Affiliation(s)
- Nuray Erin
- Department of Pathology, Gittlen Cancer Research Foundation, Hershey Medical Center, Pennsylvania State University, Hershey, PA 17033, USA
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Namba T, Homan T, Nishimura T, Mima S, Hoshino T, Mizushima T. Up-regulation of S100P Expression by Non-steroidal Anti-inflammatory Drugs and Its Role in Anti-tumorigenic Effects. J Biol Chem 2009; 284:4158-67. [PMID: 19073601 DOI: 10.1074/jbc.m806051200] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Affiliation(s)
- Takushi Namba
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
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Takehara M, Nishimura T, Mima S, Hoshino T, Mizushima T. Effect of Claudin Expression on Paracellular Permeability, Migration and Invasion of Colonic Cancer Cells. Biol Pharm Bull 2009; 32:825-31. [DOI: 10.1248/bpb.32.825] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Masaya Takehara
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University
| | - Tomoko Nishimura
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University
| | - Shinji Mima
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University
| | - Tatsuya Hoshino
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University
| | - Tohru Mizushima
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University
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Ishihara T, Tanaka KI, Tasaka Y, Namba T, Suzuki J, Ishihara T, Okamoto S, Hibi T, Takenaga M, Igarashi R, Sato K, Mizushima Y, Mizushima T. Therapeutic effect of lecithinized superoxide dismutase against colitis. J Pharmacol Exp Ther 2008; 328:152-64. [PMID: 18927353 DOI: 10.1124/jpet.108.144451] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Ulcerative colitis (UC) involves intestinal mucosal damage induced by reactive oxygen species (ROS), in particular, superoxide anion. Superoxide dismutase (SOD) catalyzes dismutation of superoxide anion to hydrogen peroxide, which is subsequently detoxified by catalase. Lecithinized SOD (PC-SOD) is a new modified form of SOD that has overcome previous clinical limitations of SOD. In this study, we examined the action of PC-SOD using an animal model of UC, dextran sulfate sodium (DSS)-induced colitis. DSS-induced colitis was ameliorated by daily intravenous administration of PC-SOD. Unmodified SOD produced a similar effect but only at more than 30 times the concentration of PC-SOD. In vivo electron spin resonance analysis confirmed that the increase in the colonic level of ROS associated with development of colitis was suppressed by PC-SOD administration. The dose-response profile of PC-SOD was bell-shaped, but simultaneous administration of catalase restored the ameliorative effect at high doses of PC-SOD. Accumulation of hydrogen peroxide was observed with the administration of high doses of PC-SOD, an effect that was suppressed by the simultaneous administration of catalase. We also found that either a weekly intravenous administration or daily oral administration of PC-SOD conferred protection. These results suggest that PC-SOD achieves its ameliorative effect against colitis through decreasing the colonic level of ROS and that its ineffectiveness at higher doses is because of the accumulation of hydrogen peroxide. Furthermore, we consider that intermittent or oral administration of PC-SOD can be applied clinically to improve the quality of life of UC patients.
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Affiliation(s)
- Tomoaki Ishihara
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862-0973, Japan
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Mima S, Takehara M, Takada H, Nishimura T, Hoshino T, Mizushima T. NSAIDs suppress the expression of claudin-2 to promote invasion activity of cancer cells. Carcinogenesis 2008; 29:1994-2000. [PMID: 18586689 DOI: 10.1093/carcin/bgn134] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Non-steroidal anti-inflammatory drugs (NSAIDs) show chemopreventive effects; however, the precise molecular mechanism of these effects is still unclear. On the other hand, the expression of proteins that form tight junctions (TJs) (such as claudins) in clinically isolated tumors is frequently altered relative to normal tissue. We previously reported that NSAIDs upregulate the expression of claudin-4 and that this upregulation contributes to NSAID-dependent inhibition of both migration activity and anchorage-independent growth of cancer cells. In the current study, we have systematically examined the effects of various NSAIDs on the expression of various TJ proteins and have found that NSAIDs specifically and drastically inhibit the expression of claudin-2. Overexpression or suppression of claudin-2 expression caused stimulation or inhibition, respectively, of the invasion and migration activity of cancer cells. Furthermore, NSAIDs inhibited the invasion and migration activity of cancer cells and this inhibition was suppressed by overexpression of claudin-2. In contrast, neither cell growth nor apoptosis induced by lack of anchorage of cancer cells was affected by overexpression or suppression of expression of claudin-2. These results suggest that inhibition of claudin-2 expression by NSAIDs contributes to NSAID-dependent inhibition of invasion of cancer cells in vitro and that it may be involved in the chemopreventive effects of NSAIDs by inhibiting metastasis in vivo.
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Affiliation(s)
- Shinji Mima
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
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Gu JM, Lim SO, Park YM, Jung G. A novel splice variant of occludin deleted in exon 9 and its role in cell apoptosis and invasion. FEBS J 2008; 275:3145-56. [PMID: 18489585 DOI: 10.1111/j.1742-4658.2008.06467.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The tight junction protein occludin participates in cell adhesion and migration and has been shown to possess antitumorigenic properties; however, the exact mechanism underlying these effects is poorly understood. In liver cell lines, we identified an occludin splice variant deleted in exon 9 (Occ(DeltaE9)). Furthermore, comparison analysis of wild-type occludin (Occ(WT)) and Occ(DeltaE9) revealed that exon 9 played important roles in the induction of mitochondria-mediated apoptosis and the inhibition of invasion, along with the downregulation of matrix metalloproteinase expression. In addition, by using the calcium indicator X-rhod-1, and the inositol trisphosphate receptor inhibitor 2-aminoethoxydiphenyl borate, we found that Occ(WT) but not Occ(DeltaE9) increased calcium release from the endoplasmic reticulum. In conclusion, our results showed that occludin mediates apoptosis and invasion by elevating the cytoplasmic calcium concentration and that exon 9 of occludin is an important region that mediates these effects.
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Affiliation(s)
- Jin-Mo Gu
- Department of Biological Sciences and Seoul National University, 56-1 Shillim-dong, Kwanak-gu, Seoul, Korea
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MIZUSHIMA T. A Strategy for Development of NSAIDs with Lower Risk for Side Effects. YAKUGAKU ZASSHI 2008; 128:255-61. [PMID: 18239373 DOI: 10.1248/yakushi.128.255] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Tohru MIZUSHIMA
- Graduate School of Medical and Pharmaceutical Sciences, Research Institute for Drug Discovery, Kumamoto University
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Ueda J, Semba S, Chiba H, Sawada N, Seo Y, Kasuga M, Yokozaki H. Heterogeneous Expression of Claudin-4 in Human Colorectal Cancer: Decreased Claudin-4 Expression at the Invasive Front Correlates Cancer Invasion and Metastasis. Pathobiology 2007; 74:32-41. [PMID: 17496431 DOI: 10.1159/000101049] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Accepted: 01/04/2007] [Indexed: 01/21/2023] Open
Abstract
OBJECTIVE Claudin-4 plays a key role in constructing the tight junction (TJ), and altered claudin-4 expression has been documented in various human malignancies; however, little is known about the biological significance of claudin-4 in colorectal cancers (CRCs). The aim of this study is to investigate the significance of claudin-4 expression in CRC and its association with clinicopathological factors. METHODS The levels of claudin-4 expression in a total of 129 CRCs and 44 metastatic tumors were examined by immunohistochemistry. A small interfering RNA (siRNA)-mediated claudin-4 knockdown examination was also conducted to assess the biological role(s) of claudin-4 in cultured cells. RESULTS Expression of claudin-4 at the intercellular membrane was well preserved at the surface of the tumor; however, decreased claudin-4 expression was detected in 57% of CRCs, particularly at the invasive front. Interestingly, decreased claudin-4 expression was detected in metastatic lesions of CRC. The siRNA-mediated claudin-4 knockdown in SW480 claudin-4-positive CRC cells upregulated cell motility, whereas no significant change was detected in cell proliferation. CONCLUSIONS These observations suggested that disruption of claudin-4-mediated TJ construction enhances cancer cell invasion and metastasis in human CRC. Claudin-4 might be a good biomarker for diagnosing the risk of distant metastasis.
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Affiliation(s)
- Junya Ueda
- Division of Surgical Pathology, Department of Biomedical Informatics, Kobe University Graduate School of Medicine, Kobe, Japan
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Ishihara T, Hoshino T, Namba T, Tanaka KI, Mizushima T. Involvement of up-regulation of PUMA in non-steroidal anti-inflammatory drug-induced apoptosis. Biochem Biophys Res Commun 2007; 356:711-7. [PMID: 17368424 DOI: 10.1016/j.bbrc.2007.03.034] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2007] [Accepted: 03/06/2007] [Indexed: 10/23/2022]
Abstract
NSAIDs such as celecoxib induce apoptosis in cancer cells. Although this apoptotic effect is involved in the anti-tumor activity associated with such drugs, the mechanism by which this occurs is not fully understood. We report here that various NSAIDs, including celecoxib, up-regulate PUMA, a Bcl-2 family protein with potent apoptosis-inducing activity, in human gastric carcinoma cell line, accompanying the induction of apoptosis. Experiments using siRNA and an intracellular Ca(2+) chelator revealed that Ca(2+)-dependent up-regulation of ATF4 and CHOP is involved in this up-regulation of PUMA. The siRNA for PUMA inhibited the celecoxib-induced activation and translocation of Bax, release of cytochrome c into the cytosol and induction of apoptosis, suggesting that PUMA plays an important role in celecoxib-induced mitochondrial dysfunction and the resulting apoptosis.
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Affiliation(s)
- Tomoaki Ishihara
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
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47
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Mima S, Ushijima H, Hwang HJ, Tsutsumi S, Makise M, Yamaguchi Y, Tsuchiya T, Mizushima H, Mizushima T. Identification of theTPO1gene in yeast, and its human orthologue TETRAN, which cause resistance to NSAIDs. FEBS Lett 2007; 581:1457-63. [PMID: 17362938 DOI: 10.1016/j.febslet.2007.03.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2007] [Accepted: 03/01/2007] [Indexed: 11/25/2022]
Abstract
Non-steroidal anti-inflammatory drugs (NSAIDs), such as indomethacin, have serious gastrointestinal side effects. Since their direct cytotoxicity was suggested to be involved in this side effect, we here tried to identify NSAID-resistant genes. We screened for Saccharomyces cerevisiae genes whose overexpression causes indomethacin resistance and identified the TPO1 gene, which encodes a major facilitator superfamily transporter. Its overexpression or deletion made yeast cells resistant or sensitive, respectively, to some NSAIDs. A BLAST search identified the possible human orthologue of Tpo1p, tetracycline transporter-like protein (TETRAN), whose overexpression in cultured human cells caused resistance to some NSAIDs, suggesting that TETRAN is an efflux pump for some NSAIDs.
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Affiliation(s)
- Shinji Mima
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
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48
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Namba T, Ishihara T, Tanaka KI, Hoshino T, Mizushima T. Transcriptional activation of ATF6 by endoplasmic reticulum stressors. Biochem Biophys Res Commun 2007; 355:543-8. [PMID: 17307147 DOI: 10.1016/j.bbrc.2007.02.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2007] [Accepted: 02/02/2007] [Indexed: 11/18/2022]
Abstract
Previous studies have shown that modification of activating transcription factor 6 (ATF6) protein is important for the endoplasmic reticulum (ER) stress response; ER stressors stimulate the degradation of ATF6 by Site-1 protease (S1P) and Site-2 protease (S2P) into p50-ATF6, which acts as a transcription factor. In the current study, we found that all of the ER stressors tested (such as thapsigargin) up-regulate ATF6 mRNA expression. As thapsigargin did not affect the stability of the ATF6 mRNA, it was concluded that this up-regulation is due to transcriptional activation of ATF6. An inhibitor of S1P suppressed this up-regulation of ATF6 mRNA expression and putative ATF6-binding elements in the promoter of ATF6 were identified, suggesting that p50-ATF6 positively regulates the gene expression of ATF6. Since cells over-expressing ATF6 showed an enhanced ER stress response, we propose that up-regulation of ATF6 mRNA expression is involved in enhancing the ER stress response.
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Affiliation(s)
- Takushi Namba
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
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Namba T, Hoshino T, Tanaka KI, Tsutsumi S, Ishihara T, Mima S, Suzuki K, Ogawa S, Mizushima T. Up-regulation of 150-kDa oxygen-regulated protein by celecoxib in human gastric carcinoma cells. Mol Pharmacol 2006; 71:860-70. [PMID: 17167033 DOI: 10.1124/mol.106.027698] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Induction of apoptosis by nonsteroidal anti-inflammatory drugs, such as celecoxib, is involved in their antitumor activity. An endoplasmic reticulum chaperone, 150-kDa oxygen-regulated protein (ORP150) is essential for the maintenance of cellular viability under hypoxia and is reported to be overexpressed in clinically isolated tumors. We here found that ORP150 was up-regulated by celecoxib in human gastric carcinoma cells. In conjunction with the suppression of tumor growth, orally administered celecoxib up-regulated ORP150 in xenograft tumors. Both the ATF4 and ATF6 pathways were activated by celecoxib, and suppression of ATF4 and ATF6 mRNA expression by small interfering RNA (siRNA) inhibited the celecoxib-dependent up-regulation of ORP150. Celecoxib administration led to an increase in the intracellular concentration of Ca2+, whereas 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid-acetoxymethyl ester, an intracellular Ca2+ chelator, inhibited the up-regulation of ORP150 and the activation of the ATF4 and ATF6 pathways. These results suggest that these Ca2+-activated pathways are involved in the celecoxib-mediated up-regulation of ORP150. Clones overexpressing ORP150 were less susceptible to celecoxib-induced, but not staurosporine-induced, apoptosis and displayed less up-regulation of C/EBP homologous transcription factor (CHOP), a transcription factor with apoptosis-inducing activity. In contrast, siRNA for ORP150 stimulated apoptosis and expression of CHOP in the presence of celecoxib but not staurosporine. These results suggest that up-regulation of ORP150 in cancer cells inhibits celecoxib-induced apoptosis, thereby decreasing the potential antitumor activity of celecoxib.
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Affiliation(s)
- Takushi Namba
- Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862-0973, Japan
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