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Kumari L, Yadav R, Kumar Y, Bhatia A. Role of tight junction proteins in shaping the immune milieu of malignancies. Expert Rev Clin Immunol 2024:1-17. [PMID: 39126381 DOI: 10.1080/1744666x.2024.2391915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Revised: 08/05/2024] [Accepted: 08/09/2024] [Indexed: 08/12/2024]
Abstract
INTRODUCTION Tight junctions (TJs) and their constituent proteins play pivotal roles in cellular physiology and anatomy by establishing functional boundaries within and between neighboring cells. While the involvement of TJ proteins, such as claudins, in cancer is extensively studied, studies highlighting their interaction with immune system are still meager. Studies indicate that alterations in cytokines and immune cell populations can affect TJ proteins, compromising TJ barrier function and exacerbating pro-inflammatory conditions, potentially leading to epithelial cell malignancy. Disrupted TJs in established tumors may foster a pro-tumor immune microenvironment, facilitating tumor progression, invasion, epithelial-to-mesenchymal transition and metastasis. Although previous literature contains many studies describing the involvement of TJs in pathogenesis of malignancies their role in modulating the immune microenvironment of tumors is just beginning to be unleashed. AREAS COVERED This article for the first time attempts to discern the importance of interaction between TJs and immune microenvironment in malignancies. To achieve the above aim a thorough search of databases like PubMed and Google Scholar was conducted to identify the recent and relevant articles on the topic. EXPERT OPINION Breaking the vicious cycle of dysbiosis/infections/chemical/carcinogen-induced inflammation-TJ remodeling-malignancy-TJ dysregulation-more inflammation can be used as a strategy to complement the effect of immunotherapies in various malignancies.
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Affiliation(s)
- Laxmi Kumari
- Department of Experimental Medicine and Biotechnology, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Reena Yadav
- Department of Experimental Medicine and Biotechnology, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Yashwant Kumar
- Department of Immunopathology, Post Graduate Institute of medical Education and Research, Chandigarh, India
| | - Alka Bhatia
- Department of Experimental Medicine and Biotechnology, Post Graduate Institute of Medical Education & Research, Chandigarh, India
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2
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Eguchi H, Yu Y, Matsunaga T, Yoshino Y, Ikari A. Acrolein suppresses anticancer drug-induced toxicity mediated by activating claudin-1 and Nrf2 axis in a spheroid model of human lung squamous cell carcinoma cells. Toxicol Lett 2024; 392:46-55. [PMID: 38142011 DOI: 10.1016/j.toxlet.2023.12.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 12/07/2023] [Accepted: 12/20/2023] [Indexed: 12/25/2023]
Abstract
Tobacco smoke contains various carcinogenic ingredients such as nicotine, acrolein, and benzopyrene; however, their effects on cancer treatment are not fully understood. Claudin-1 (CLDN1), a component of tight junctions, is involved in the increased resistance to anticancer drugs. In this study, we found that acrolein increases the mRNA and protein levels of CLDN1 in RERF-LC-AI cells derived from human lung squamous cell carcinoma (SCC). Acrolein increased the p-extracellular signal-regulated kinase (ERK) 1/2 levels without affecting the p-Akt level. The acrolein-induced elevation of CLDN1 expression was attenuated by U0126, a mitogen-activated protein kinase kinas (MEK) inhibitor. These results indicate that the activation of MEK/ERK pathway is involved in the acrolein-induced elevation of CLDN1 expression. In a spheroid model, acrolein suppressed the accumulation and toxicity of doxorubicin (DXR), which were rescued by CLDN1 silencing. The acrolein-induced effects were also observed in lung SCC-derived EBC-1 and LK-2 cells. Acrolein also increased the expression level of nuclear factor erythroid 2-related factor 2 (Nrf2), a transcription factor that regulates antioxidant and detoxifying genes, which were inhibited by CLDN1 silencing. In spheroid cells, the levels of reactive oxygen species were enhanced by acrolein, which was inhibited by CLDN1 silencing. Taken together, acrolein may reduce the anticancer drug-induced toxicity in human lung SCC cells mediated by high CLDN1 expression followed by the upregulation of Nrf2 signaling pathway.
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Affiliation(s)
- Hiroaki Eguchi
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Yaqing Yu
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Toshiyuki Matsunaga
- Laboratory of Bioinformatics, Gifu Pharmaceutical University, Gifu 502-8585, Japan
| | - Yuta Yoshino
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Akira Ikari
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan.
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Ling Y, Kang X, Yi Y, Feng S, Ma G, Qu H. CLDN5: From structure and regulation to roles in tumors and other diseases beyond CNS disorders. Pharmacol Res 2024; 200:107075. [PMID: 38228255 DOI: 10.1016/j.phrs.2024.107075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 01/11/2024] [Accepted: 01/11/2024] [Indexed: 01/18/2024]
Abstract
Claudin-5 (CLDN5) is an essential component of tight junctions (TJs) and is critical for the integrity of the blood-brain barrier (BBB), ensuring homeostasis and protection from damage to the central nervous system (CNS). Currently, many researchers have summarized the role and mechanisms of CLDN5 in CNS diseases. However, it is noteworthy that CLDN5 also plays a significant role in tumor growth and metastasis. In addition, abnormal CLDN5 expression is involved in the development of respiratory diseases, intestinal diseases, cardiac diseases, and diabetic ocular complications. This paper aims to review the structure, expression, and regulation of CLDN5, focusing on its role in tumors, including its expression and regulation, effects on malignant phenotypes, and clinical significance. Furthermore, this paper will provide an overview of the role and mechanisms of CLDN5 in respiratory diseases, intestinal diseases, cardiac diseases, and diabetic ocular complications.
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Affiliation(s)
- Yao Ling
- Department of Histology and Embryology, College of Basic Medical Sciences, Jilin University, Changchun, China; Bethune Second Clinical Medical College of Jilin University, Changchun, China
| | - Xinxin Kang
- Department of Histology and Embryology, College of Basic Medical Sciences, Jilin University, Changchun, China; Bethune Second Clinical Medical College of Jilin University, Changchun, China
| | - Ying Yi
- Department of Histology and Embryology, College of Basic Medical Sciences, Jilin University, Changchun, China; Bethune Second Clinical Medical College of Jilin University, Changchun, China
| | - Shenao Feng
- Department of Histology and Embryology, College of Basic Medical Sciences, Jilin University, Changchun, China; Bethune Second Clinical Medical College of Jilin University, Changchun, China
| | - Guanshen Ma
- Department of Histology and Embryology, College of Basic Medical Sciences, Jilin University, Changchun, China; Bethune Second Clinical Medical College of Jilin University, Changchun, China
| | - Huinan Qu
- Department of Histology and Embryology, College of Basic Medical Sciences, Jilin University, Changchun, China.
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Schumacher JA, Wright ZA, Rufin Florat D, Anand SK, Dasyani M, Batta SPR, Laverde V, Ferrari K, Klimkaite L, Bredemeier NO, Gurung S, Koller GM, Aguera KN, Chadwick GP, Johnson RD, Davis GE, Sumanas S. SH2 domain protein E and ABL signaling regulate blood vessel size. PLoS Genet 2024; 20:e1010851. [PMID: 38190417 PMCID: PMC10798624 DOI: 10.1371/journal.pgen.1010851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 01/19/2024] [Accepted: 12/20/2023] [Indexed: 01/10/2024] Open
Abstract
Blood vessels in different vascular beds vary in size, which is essential for their function and fluid flow along the vascular network. Molecular mechanisms involved in the formation of a vascular lumen of appropriate size, or tubulogenesis, are still only partially understood. Src homology 2 domain containing E (She) protein was previously identified in a screen for proteins that interact with Abelson (Abl)-kinase. However, its biological role has remained unknown. Here we demonstrate that She and Abl signaling regulate vessel size in zebrafish embryos and human endothelial cell culture. Zebrafish she mutants displayed increased endothelial cell number and enlarged lumen size of the dorsal aorta (DA) and defects in blood flow, eventually leading to the DA collapse. Vascular endothelial specific overexpression of she resulted in a reduced diameter of the DA, which correlated with the reduced arterial cell number and lower endothelial cell proliferation. Chemical inhibition of Abl signaling in zebrafish embryos caused a similar reduction in the DA diameter and alleviated the she mutant phenotype, suggesting that She acts as a negative regulator of Abl signaling. Enlargement of the DA size in she mutants correlated with an increased endothelial expression of claudin 5a (cldn5a), which encodes a protein enriched in tight junctions. Inhibition of cldn5a expression partially rescued the enlarged DA in she mutants, suggesting that She regulates DA size, in part, by promoting cldn5a expression. SHE knockdown in human endothelial umbilical vein cells resulted in a similar increase in the diameter of vascular tubes, and also increased phosphorylation of a known ABL downstream effector CRKL. These results argue that SHE functions as an evolutionarily conserved inhibitor of ABL signaling and regulates vessel and lumen size during vascular tubulogenesis.
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Affiliation(s)
- Jennifer A. Schumacher
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, Ohio, United States of America
- University of Cincinnati College of Medicine, Department of Pediatrics, Cincinnati, Ohio, United States of America
- Department of Biological Sciences, Miami University, Hamilton, Ohio, United States of America
| | - Zoë A. Wright
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, Ohio, United States of America
| | - Diandra Rufin Florat
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, Florida, United States of America
| | - Surendra K. Anand
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, Florida, United States of America
| | - Manish Dasyani
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, Ohio, United States of America
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, Florida, United States of America
| | - Surya Prakash Rao Batta
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, Florida, United States of America
| | - Valentina Laverde
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, Florida, United States of America
| | - Kaitlin Ferrari
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, Florida, United States of America
| | - Laurita Klimkaite
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, Ohio, United States of America
| | - Nina O. Bredemeier
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, Ohio, United States of America
| | - Suman Gurung
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, Florida, United States of America
| | - Gretchen M. Koller
- University of South Florida, Department of Molecular Pharmacology and Physiology, Tampa, Florida, United States of America
| | - Kalia N. Aguera
- University of South Florida, Department of Molecular Pharmacology and Physiology, Tampa, Florida, United States of America
| | - Griffin P. Chadwick
- Department of Biological Sciences, Miami University, Hamilton, Ohio, United States of America
| | - Riley D. Johnson
- Department of Biological Sciences, Miami University, Hamilton, Ohio, United States of America
| | - George E. Davis
- University of South Florida, Department of Molecular Pharmacology and Physiology, Tampa, Florida, United States of America
| | - Saulius Sumanas
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, Ohio, United States of America
- University of Cincinnati College of Medicine, Department of Pediatrics, Cincinnati, Ohio, United States of America
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, Florida, United States of America
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Han WJ, He P. A novel tumor microenvironment-related gene signature with immune features for prognosis of lung squamous cell carcinoma. J Cancer Res Clin Oncol 2023; 149:13137-13154. [PMID: 37479755 DOI: 10.1007/s00432-023-05042-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Accepted: 06/28/2023] [Indexed: 07/23/2023]
Abstract
PURPOSE Lung squamous cell carcinoma (LUSC) is an aggressive subset of non-small-cell lung cancer (NSCLC). The tumor microenvironment (TME) plays an important role in the development of LUSC. We aim to identify potential therapeutic targets and a TME-related prognostic signature and for LUSC. METHODS TME-related genes were obtained from TCGA-LUSC dataset. LUSC samples were clustered by the non-negative matrix clustering algorithm (NMF). The prognostic signature was constructed through univariate Cox regression, multivariate Cox regression, and the least absolute shrinkage and selection operator (LASSO) analyses. Gene set enrichment analysis (GSEA) was carried out to explore the enrichment pathways. RESULTS This study constructed a prognostic signature which contained 12 genes: HHIPL2, PLK4, SLC6A4, LSM1, TSLP, P4HA1, AMH, CLDN5, NRTN, CDH2, PTGIS, and STX1A. Patients were classified into high-risk and low-risk groups according to the median risk score of this signature. Compared with low-risk group patients, patients in high-risk group patients had poorer overall survival, which demonstrated this signature was an independent prognostic factor. Besides, correlation analysis and GSEA results revealed that genes of this signature were correlated with immune cells and drug response. CONCLUSION Our novel signature based on 12 TME-related genes might be applied as an independent prognostic indicator. Importantly, the signature could be a promising biomarker and accurately predict the prognosis of LUSC patients.
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Affiliation(s)
- Wan Jia Han
- Beijing Normal University, Beijing, China.
- Sichuan Second Hospital of TCM, Chengdu, China.
| | - Pengzhi He
- Beijing Normal University, Beijing, China
- Sichuan Second Hospital of TCM, Chengdu, China
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Tao D, Guan B, Li H, Zhou C. Expression patterns of claudins in cancer. Heliyon 2023; 9:e21338. [PMID: 37954388 PMCID: PMC10637965 DOI: 10.1016/j.heliyon.2023.e21338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 10/17/2023] [Accepted: 10/19/2023] [Indexed: 11/14/2023] Open
Abstract
Claudins are four-transmembrane proteins, which were found in tight junctions. They maintain cell barriers and regulate cell differentiation and proliferation. They are involved in maintaining cellular polarity and normal functions. Different claudins show different expression patterns. The expression level and localization of claudins are altered in various cancers. They promote or inhibit proliferation, invasion, and migration of cancer cells through multiple signaling pathways. Therefore, claudins may serve as diagnostic markers, novel therapeutic targets, and prognostic risk factors. The important roles of claudins in cancer aroused our great interest. In the present review, we provide a summary of insights into expression patterns of claudins in cancer, which is more comprehensive and provides new ideas for further research.
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Affiliation(s)
- Daoyu Tao
- Department of Pathology, The Second Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Bingxin Guan
- Department of Pathology, The Second Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Hui Li
- Department of Pathology, The Second Hospital of Shandong University, Jinan, 250012, Shandong, China
| | - Chengjun Zhou
- Department of Pathology, The Second Hospital of Shandong University, Jinan, 250012, Shandong, China
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7
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Pan C, Xu A, Ma X, Yao Y, Zhao Y, Wang C, Chen C. Research progress of Claudin-low breast cancer. Front Oncol 2023; 13:1226118. [PMID: 37904877 PMCID: PMC10613467 DOI: 10.3389/fonc.2023.1226118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Accepted: 09/26/2023] [Indexed: 11/01/2023] Open
Abstract
Claudin-low breast cancer (CLBC) is a subgroup of breast cancer discovered at the molecular level in 2007. Claudin is one of the primary proteins that make up tight junctions, and it plays crucial roles in anti-inflammatory and antitumor responses as well as the maintenance of water and electrolyte balance. Decreased expression of claudin results in the disruption of tight junction structures and the activation of downstream signaling pathways, which can lead to tumor formation. The origin of Claudin-low breast cancer is still in dispute. Claudin-low breast cancer is characterized by low expression of Claudin3, 4, 7, E-cadherin, and HER2 and high expression of Vimentin, Snai 1/2, Twist 1/2, Zeb 1/2, and ALDH1, as well as stem cell characteristics. The clinical onset of claudin-low breast cancer is at menopause age, and its histological grade is higher. This subtype of breast cancer is more likely to spread to lymph nodes than other subtypes. Claudin-low breast cancer is frequently accompanied by increased invasiveness and a poor prognosis. According to a clinical retrospective analysis, claudin-low breast cancer can achieve low pathological complete remission. At present, although several therapeutic targets of claudin-low breast cancer have been identified, the effective treatment remains in basic research stages, and no animal studies or clinical trials have been designed. The origin, molecular biological characteristics, pathological characteristics, treatment, and prognosis of CLBC are extensively discussed in this article. This will contribute to a comprehensive understanding of CLBC and serve as the foundation for the individualization of breast cancer treatment.
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Affiliation(s)
- Chenglong Pan
- Department of Pathology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China
- Kunming Medical University, Kunming, Yunnan, China
| | - Anqi Xu
- Kunming Medical University, Kunming, Yunnan, China
- Department of Anesthesia, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China
| | - Xiaoling Ma
- Department of Pathology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China
- Kunming Medical University, Kunming, Yunnan, China
| | - Yanfei Yao
- Department of Pathology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China
- Kunming Medical University, Kunming, Yunnan, China
| | - Youmei Zhao
- Department of Pathology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China
- Kunming Medical University, Kunming, Yunnan, China
| | - Chunyan Wang
- Department of Pathology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China
| | - Ceshi Chen
- Academy of Biomedical Engineering, Kunming Medical University, Kunming, Yunnan, China
- The Third Affiliated Hospital, Kunming Medical University, Kunming, Yunnan, China
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Schumacher JA, Wright ZA, Florat DR, Anand SK, Dasyani M, Klimkaite L, Bredemeier NO, Gurung S, Koller GM, Aguera KN, Chadwick GP, Johnson RD, Davis GE, Sumanas S. SH2 domain protein E (SHE) and ABL signaling regulate blood vessel size. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.07.03.547455. [PMID: 37461480 PMCID: PMC10349984 DOI: 10.1101/2023.07.03.547455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
Blood vessels in different vascular beds vary in lumen diameter, which is essential for their function and fluid flow along the vascular network. Molecular mechanisms involved in the formation of a vascular lumen of appropriate size, or tubulogenesis, are still only partially understood. Src homology 2 domain containing E (She) protein was previously identified in a screen for proteins that interact with Abelson (Abl)-kinase. However, its biological role has remained unknown. Here we demonstrate that She and Abl signaling regulate vascular lumen size in zebrafish embryos and human endothelial cell culture. Zebrafish she mutants displayed increased endothelial cell number and enlarged lumen size of the dorsal aorta (DA) and defects in blood flow. Vascular endothelial specific overexpression of she resulted in a reduced diameter of the DA lumen, which correlated with the reduced arterial cell number and lower endothelial cell proliferation. Chemical inhibition of Abl signaling in zebrafish embryos caused a similar reduction in the DA diameter and alleviated the she mutant phenotype, suggesting that She acts as a negative regulator of Abl signaling. Enlargement of the DA lumen in she mutants correlated with an increased endothelial expression of claudin 5a and 5b (cldn5a / cldn5b), which encode proteins enriched in tight junctions. Inhibition of cldn5a expression partially rescued the enlarged DA in she mutants, suggesting that She regulates DA lumen size, in part, by promoting cldn5a expression. SHE knockdown in human endothelial umbilical vein cells resulted in a similar increase in the diameter of vascular tubes, and also increased phosphorylation of a known ABL downstream effector CRKL. These results argue that SHE functions as an evolutionarily conserved inhibitor of ABL signaling and regulates lumen size during vascular tubulogenesis.
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Affiliation(s)
- Jennifer A. Schumacher
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, OH 45229, USA
- University of Cincinnati College of Medicine, Department of Pediatrics, Cincinnati, OH 45267, USA
- Department of Biological Sciences, Miami University, Hamilton, OH 45011, USA
| | - Zoë A. Wright
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, OH 45229, USA
| | - Diandra Rufin Florat
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, FL 33602, USA
| | - Surendra K. Anand
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, FL 33602, USA
| | - Manish Dasyani
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, OH 45229, USA
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, FL 33602, USA
| | - Laurita Klimkaite
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, OH 45229, USA
| | - Nina O. Bredemeier
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, OH 45229, USA
| | - Suman Gurung
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, FL 33602, USA
| | - Gretchen M. Koller
- University of South Florida, Department of Molecular Pharmacology and Physiology, Tampa, FL 33612, USA
| | - Kalia N. Aguera
- University of South Florida, Department of Molecular Pharmacology and Physiology, Tampa, FL 33612, USA
| | - Griffin P. Chadwick
- Department of Biological Sciences, Miami University, Hamilton, OH 45011, USA
| | - Riley D. Johnson
- Department of Biological Sciences, Miami University, Hamilton, OH 45011, USA
| | - George E. Davis
- University of South Florida, Department of Molecular Pharmacology and Physiology, Tampa, FL 33612, USA
| | - Saulius Sumanas
- Cincinnati Children’s Hospital Medical Center, Division of Developmental Biology, Cincinnati, OH 45229, USA
- University of Cincinnati College of Medicine, Department of Pediatrics, Cincinnati, OH 45267, USA
- University of South Florida, Department of Pathology and Cell Biology, USF Health Heart Institute, Tampa, FL 33602, USA
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9
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Huang S, Zhang J, Li Y, Xu Y, Jia H, An L, Wang X, Yang Y. Downregulation of Claudin5 promotes malignant progression and radioresistance through Beclin1-mediated autophagy in esophageal squamous cell carcinoma. J Transl Med 2023; 21:379. [PMID: 37303041 DOI: 10.1186/s12967-023-04248-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 06/05/2023] [Indexed: 06/13/2023] Open
Abstract
BACKGROUND Esophageal squamous cell carcinoma (ESCC) is a highly prevalent and aggressive cancer with poor treatment outcomes. Despite the critical role of tight junction proteins in tumorigenesis, the involvement of Claudin5 in ESCC remains poorly understood. Thus, this study aimed to investigate the role of Claudin5 in ESCC malignant progression and radioresistance, as well as the underlying regulatory mechanisms. METHODS The expression of Claudin5 was evaluated in esophageal cancer tissue using both public databases and 123 clinical samples. CCK-8, transwell invasion, wound healing and clonogenic survival assays were used to examine the proliferation, invasion, migration and radiosensitivity of ESCC cells in vitro. Xenograft and animal lung metastasis experiments were conducted to examine the impact of Claudin5 on tumor growth and lung metastasis in vivo. The effect of Claudin5 on autophagy was detected via transmission electron microscopy, western blotting and autophagy flux. Immunohistochemical staining was used to detect Claudin5 expression in ESCC patient samples. The statistical difference was assessed with Student t test or one-way ANOVA. The correlation between Claudin5 expression and radiotherapy response rate was performed by the Chi-square test. The significance of Kaplan-Meier curves was evaluated by the Logrank test. RESULTS Claudin5 expression was downregulated in ESCC tissues. Downregulation of Claudin5 promoted ESCC cell proliferation, invasion, and migration both in vitro and in vivo. Downregulation of Claudin5 decreased the radiosensitivity of ESCC cells. Moreover, downregulation of Claudin5 promoted autophagy and the expression of Beclin1. Beclin1 knockdown reversed the effect of Claudin5 downregulation on autophagy induction and the promotion of ESCC cell malignant progression and radioresistance. Additionally, low expression of Claudin5 in ESCC cancer tissues was associated with poor radiotherapy response and prognosis. CONCLUSIONS In summary, these findings suggest that downregulation of Claudin5 promotes ESCC malignant progression and radioresistance via Beclin1-autophagy activation and may serve as a promising biomarker for predicting radiotherapy response and patient outcome in ESCC.
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Affiliation(s)
- Shan Huang
- Department of Radiation Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, China.
| | - Jiayi Zhang
- Department of Radiation Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, China
| | - Yi Li
- Department of Radiation Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, China
| | - Yaqiong Xu
- Department of Radiation Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, China
| | - Hui Jia
- Department of Radiation Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, China
| | - Lei An
- Department of Radiation Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, China
| | - Xiaotan Wang
- Department of Radiation Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, China
| | - Yuting Yang
- Department of Radiation Oncology, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi Wu Road, Xi'an, 710004, China
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10
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Bhat SM, Prasad PR, Joshi MB. Novel insights into DNA methylation-based epigenetic regulation of breast tumor angiogenesis. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2023; 380:63-96. [PMID: 37657860 DOI: 10.1016/bs.ircmb.2023.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/03/2023]
Abstract
Breast tumors are highly vascularized and dependent on angiogenesis for growth, progression and metastasis. Like other solid tumors, vasculature in breast tumors also display leaky and tortuous phenotype and hence inhibit immune cell infiltration, show reduced efficacy to anticancer drugs and radiotherapy. Epigenetic reprogramming including significant alterations in DNA methylation in tumor and stromal cells generate an imbalance in expression of pro- and anti-angiogenic factors and subsequently lead to disordered angiogenesis. Hence, understanding DNA methylation-based regulation of angiogenesis in breast tumors may open new avenues for designing therapeutic targets. Our present review manuscript summarized contemporary knowledge of influence of DNA methylation in regulating angiogenesis. Further, we identified novel set of pro-angiogenic genes enriched in endothelial cells which are coregulated with DNMT isoforms in breast tumors and harboring CpG islands. Our analysis revealed promoters of pro-angiogenic genes were hypomethylated and anti-angiogenic genes were hypermethylated in tumors and further reflected on their expression patterns. Interestingly, promoter DNA methylation intensities of novel set of pro-angiogenic genes significantly correlated to patient survival outcome.
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Affiliation(s)
- Sharath Mohan Bhat
- Department of Ageing Research, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, India
| | - Palla Ranga Prasad
- Department of Ageing Research, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, India
| | - Manjunath B Joshi
- Department of Ageing Research, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, India.
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Chen J, Xu Z, Hu C, Zhang S, Zi M, Yuan L, Cheng X. Targeting CLDN18.2 in cancers of the gastrointestinal tract: New drugs and new indications. Front Oncol 2023; 13:1132319. [PMID: 36969060 PMCID: PMC10036590 DOI: 10.3389/fonc.2023.1132319] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Accepted: 02/27/2023] [Indexed: 03/12/2023] Open
Abstract
Cancers of the gastrointestinal (GI) tract greatly contribute to the global cancer burden and cancer-related death. Claudin-18.2(CLDN18.2), a transmembrane protein, is a major component of tight junctions and plays an important role in the maintenance of barrier function. Its characteristic widespread expression in tumour tissues and its exposed extracellular loops make it an ideal target for researchers to develop targeted strategies and immunotherapies for cancers of the GI tract. In the present review, we focus on the expression pattern of CLDN18.2 and its clinical significance in GI cancer. We also discuss the tumour-promoting and/or tumour-inhibiting functions of CLDN18.2, the mechanisms regulating its expression, and the current progress regarding the development of drugs targeting CLDN18.2 in clinical research.
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Affiliation(s)
- Jinxia Chen
- Department of Gastric Surgery, The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institutes of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, China
| | - Zhiyuan Xu
- Department of Gastric Surgery, The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institutes of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, China
- Zhejiang Provincial Research Center for Upper Gastrointestinal Tract Cancer, Zhejiang Cancer Hospital, Hangzhou, China
- Zhejiang Key Lab of Prevention, Diagnosis and Therapy of Upper Gastrointestinal Cancer, Zhejiang Cancer Hospital, Hangzhou, China
| | - Can Hu
- Department of Gastric Surgery, The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institutes of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, China
- Zhejiang Provincial Research Center for Upper Gastrointestinal Tract Cancer, Zhejiang Cancer Hospital, Hangzhou, China
- Zhejiang Key Lab of Prevention, Diagnosis and Therapy of Upper Gastrointestinal Cancer, Zhejiang Cancer Hospital, Hangzhou, China
| | - Shengjie Zhang
- Department of Gastric Surgery, The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institutes of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, China
- Zhejiang Provincial Research Center for Upper Gastrointestinal Tract Cancer, Zhejiang Cancer Hospital, Hangzhou, China
- Zhejiang Key Lab of Prevention, Diagnosis and Therapy of Upper Gastrointestinal Cancer, Zhejiang Cancer Hospital, Hangzhou, China
| | - Mengli Zi
- Department of Gastric Surgery, The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institutes of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, China
| | - Li Yuan
- Department of Gastric Surgery, The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institutes of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, China
- Zhejiang Provincial Research Center for Upper Gastrointestinal Tract Cancer, Zhejiang Cancer Hospital, Hangzhou, China
- Zhejiang Key Lab of Prevention, Diagnosis and Therapy of Upper Gastrointestinal Cancer, Zhejiang Cancer Hospital, Hangzhou, China
- *Correspondence: Li Yuan, ; Xiangdong Cheng,
| | - Xiangdong Cheng
- Department of Gastric Surgery, The Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institutes of Basic Medicine and Cancer (IBMC), Chinese Academy of Sciences, Hangzhou, China
- Zhejiang Provincial Research Center for Upper Gastrointestinal Tract Cancer, Zhejiang Cancer Hospital, Hangzhou, China
- Zhejiang Key Lab of Prevention, Diagnosis and Therapy of Upper Gastrointestinal Cancer, Zhejiang Cancer Hospital, Hangzhou, China
- *Correspondence: Li Yuan, ; Xiangdong Cheng,
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12
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Lu Y, Shao Y, Xie Y, Qu H, Qi D, Dong Y, Jin Q, Wang L, Wei J, Quan C. CLDN6 inhibits breast cancer cell malignant behavior by suppressing ERK signaling. Cell Signal 2022; 97:110393. [PMID: 35752352 DOI: 10.1016/j.cellsig.2022.110393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 06/15/2022] [Accepted: 06/19/2022] [Indexed: 11/03/2022]
Abstract
Claudin 6 (CLDN6) is an important component of tight junctions. Through the PDZ binding motif, CLDN6 binds to a variety of signaling proteins that contain the PDZ domain to regulate different signaling pathways, and plays an important role in the occurrence and development of tumors. Our previous work showed that CLDN6 was expressed at low levels in breast cancer cells, and overexpression of CLDN6 inhibited breast cancer cell proliferation, migration and invasion. However, the mechanism of how CLDN6 works remains unclear. In this study, we aimed to explore the mechanism by which CLDN6 inhibits breast cancer cell malignant behavior. As a result, overexpression of CLDN6 inhibited the proliferation of breast cancer cells along with the downregulation of cyclin D1, which plays an important role in regulating cell proliferation. After overexpression of Sp1 in CLDN6-overexpressing cells, the expression of cyclin D1 was upregulated. On the other hand, CLDN6 inhibited breast cancer cell migration and invasion along with the downregulation of IL-8, CXCR2 and FAK. When treated with IL-8, the migration and invasion ability were promoted along with the upregulation of CXCR2 and p-FAK, and the cytoskeleton was rearranged in CLDN6-overexpressing cells. Furthermore, when treated with the ERK signaling activator PMA, the proliferation, migration and invasion abilities were promoted along with the upregulation of Sp1, cyclin D1 and IL-8 in CLDN6-overexpressin cells. In conclusion, CLDN6 suppressed ERK/Sp1/cyclin D1 and ERK/IL-8 signaling to inhibit proliferation, migration and invasion in breast cancer cells. The mechanism may provide experimental evidence for the treatment of breast cancer targeting CLDN6.
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Affiliation(s)
- Yan Lu
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China
| | - Yijia Shao
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China
| | - Yinping Xie
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China
| | - Huinan Qu
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China
| | - Da Qi
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China
| | - Yuan Dong
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China
| | - Qiu Jin
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China
| | - Liping Wang
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China
| | - Junyuan Wei
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China
| | - Chengshi Quan
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, 126 Xinmin Avenue, Changchun, Jilin 130021, People's Republic of China.
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13
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Yang L, Zhang W, Li M, Dam J, Huang K, Wang Y, Qiu Z, Sun T, Chen P, Zhang Z, Zhang W. Evaluation of the Prognostic Relevance of Differential Claudin Gene Expression Highlights Claudin-4 as Being Suppressed by TGFβ1 Inhibitor in Colorectal Cancer. Front Genet 2022; 13:783016. [PMID: 35281827 PMCID: PMC8907593 DOI: 10.3389/fgene.2022.783016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Accepted: 01/25/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Claudins (CLDNs) are a family of closely related transmembrane proteins that have been linked to oncogenic transformation and metastasis across a range of cancers, suggesting that they may be valuable diagnostic and/or prognostic biomarkers that can be used to evaluate patient outcomes. However, CLDN expression patterns associated with colorectal cancer (CRC) remain to be defined.Methods: The mRNA levels of 21 different CLDN family genes were assessed across 20 tumor types using the Oncomine database. Correlations between these genes and patient clinical outcomes, immune cell infiltration, clinicopathological staging, lymph node metastasis, and mutational status were analyzed using the GEPIA, UALCAN, Human Protein Atlas, Tumor Immune Estimation Resource, STRING, Genenetwork, cBioportal, and DAVID databases in an effort to clarify the potential functional roles of different CLDN protein in CRC. Molecular docking analyses were used to probe potential interactions between CLDN4 and TGFβ1. Levels of CLDN4 and CLDN11 mRNA expression in clinical CRC patient samples and in the HT29 and HCT116 cell lines were assessed via qPCR. CLDN4 expression levels in these 2 cell lines were additionally assessed following TGFβ1 inhibitor treatment.Results: These analyses revealed that COAD and READ tissues exhibited the upregulation of CLDN1, CLDN2, CLDN3, CLDN4, CLDN7, and CLDN12 as well as the downregulation of CLDN5 and CLDN11 relative to control tissues. Higher CLDN11 and CLDN14 expression as well as lower CLDN23 mRNA levels were associated with poorer overall survival (OS) outcomes. Moreover, CLDN2 and CLDN3 or CLDN11 mRNA levels were significantly associated with lymph node metastatic progression in COAD or READ lower in COAD and READ tissues. A positive correlation between the expression of CLDN11 and predicted macrophage, dendritic cell, and CD4+ T cell infiltration was identified in CRC, with CLDN12 expression further being positively correlated with CD4+ T cell infiltration whereas a negative correlation was observed between such infiltration and the expression of CLDN3 and CLDN15. A positive correlation between CLDN1, CLDN16, and neutrophil infiltration was additionally detected, whereas neutrophil levels were negatively correlated with the expression of CLDN3 and CLDN15. Molecular docking suggested that CLDN4 was able to directly bind via hydrogen bond with TGFβ1. Relative to paracancerous tissues, clinical CRC tumor tissue samples exhibited CLDN4 and CLDN11 upregulation and downregulation, respectively. LY364947 was able to suppress the expression of CLDN4 in both the HT29 and HCT116 cell lines.Conclusion: Together, these results suggest that the expression of different CLDN family genes is closely associated with CRC tumor clinicopathological staging and immune cell infiltration. Moreover, CLDN4 expression is closely associated with TGFβ1 in CRC, suggesting that it and other CLDN family members may represent viable targets for antitumor therapeutic intervention.
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Affiliation(s)
- Linqi Yang
- Department of Pharmacology, Hebei University of Chinese Medicine, Shijiazhuang, China
| | - Wenqi Zhang
- Department of Hematology, The Fourth Hospital of Hebei Medical University, Shijiazhuang, China
| | - Meng Li
- Department of Pharmacology, Hebei University of Chinese Medicine, Shijiazhuang, China
| | - Jinxi Dam
- College of Natural Science, Michigan State University, East Lansing, MI, United States
| | - Kai Huang
- Department of Pharmacology, Hebei University of Chinese Medicine, Shijiazhuang, China
| | - Yihan Wang
- Department of Pharmacology, Hebei University of Chinese Medicine, Shijiazhuang, China
| | - Zhicong Qiu
- Department of Pharmacology, Hebei University of Chinese Medicine, Shijiazhuang, China
| | - Tao Sun
- Department of Pharmacology, Hebei University of Chinese Medicine, Shijiazhuang, China
| | - Pingping Chen
- Department of Pharmacology, Hebei University of Chinese Medicine, Shijiazhuang, China
- *Correspondence: Wei Zhang, ; Pingping Chen, ; Zhenduo Zhang,
| | - Zhenduo Zhang
- Shijiazhuang People’s Hospital, Shijiazhuang, China
- *Correspondence: Wei Zhang, ; Pingping Chen, ; Zhenduo Zhang,
| | - Wei Zhang
- Department of Pharmacology, Hebei University of Chinese Medicine, Shijiazhuang, China
- *Correspondence: Wei Zhang, ; Pingping Chen, ; Zhenduo Zhang,
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14
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Panwar S, Sharma S, Tripathi P. Role of Barrier Integrity and Dysfunctions in Maintaining the Healthy Gut and Their Health Outcomes. Front Physiol 2021; 12:715611. [PMID: 34630140 PMCID: PMC8497706 DOI: 10.3389/fphys.2021.715611] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 08/27/2021] [Indexed: 01/08/2023] Open
Abstract
Mucosal surface layers are the critical borders throughout epithelial membranes. These epithelial cells segregate luminal material from external environments. However, mucosal linings are also accountable for absorbing nutrients and requiring specific barrier permeability. These functional acts positioned the mucosal epithelium at the epicenter of communications concerning the mucosal immune coordination and foreign materials, such as dietary antigens and microbial metabolites. Current innovations have revealed that external stimuli can trigger several mechanisms regulated by intestinal mucosal barrier system. Crucial constituents of this epithelial boundary are physical intercellular structures known as tight junctions (TJs). TJs are composed of different types transmembrane proteins linked with cytoplasmic adaptors which helps in attachment to the adjacent cells. Disruption of this barrier has direct influence on healthy or diseased condition, as barrier dysfunctions have been interrelated with the initiation of inflammation, and pathogenic effects following metabolic complications. In this review we focus and overview the TJs structure, function and the diseases which are able to influence TJs during onset of disease. We also highlighted and discuss the role of phytochemicals evidenced to enhance the membrane permeability and integrity through restoring TJs levels.
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Affiliation(s)
- Shruti Panwar
- Infection and Immunology, Translational Health Science and Technology Institute, National Capital Region (NCR) Biotech Science Cluster, Faridabad, India
| | - Sapna Sharma
- Gene Regulation Laboratory, School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | - Prabhanshu Tripathi
- Food Drug and Chemical Toxicology Division, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Toxicology Research, Lucknow, India
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15
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Microarray analysis of genes with differential expression of m6A methylation in lung cancer. Biosci Rep 2021; 41:229351. [PMID: 34308964 PMCID: PMC8450313 DOI: 10.1042/bsr20210523] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 07/16/2021] [Accepted: 07/19/2021] [Indexed: 12/04/2022] Open
Abstract
Purpose: N6-methyladenosine (m6A) is among the most abundant mRNA modifications in eukaryote. The aim of the present study was to investigate function of m6A mRNA methylation in lung cancer and the underlying mechanism. Methods: Microarray analysis was performed to detect the differences in RNA expression between cancerous and adjacent non-cancerous tissue samples. The target mRNAs were subjected to Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses. Hierarchical clustering of RNAs was conducted to identify distinct m6A methylation or expression patterns between the samples. Results: In the present study, some differentially expressed genes (DEGs) of mRNAs were identified, including up-regulated secret phosphoprotein 1 (SPP1) and down-regulated pRB. Functional enrichment analysis revealed that while differential hypermethylation was related to cell cycle, intracellular part and protein binding, the main pathway involved herpes simplex virus 1 infection related to down-regulated AKT, Araf1 and BCL2A1. In the meantime, sexual reproduction, cohesin complex and protein C-terminus binding was functionally linked to differential hypomethylation, while fluid shear stress and atherosclerosis were identified as the main pathways related to up-regulated GST and CNP. Conclusions: We showed that lung cancer development involved differential expression of SPP1 and pRB mRNA, as well as m6A mRNA methylation in AKT, APAF1, BCL2A1, GST and CNP genes.
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16
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Li J. Context-Dependent Roles of Claudins in Tumorigenesis. Front Oncol 2021; 11:676781. [PMID: 34354941 PMCID: PMC8329526 DOI: 10.3389/fonc.2021.676781] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 07/05/2021] [Indexed: 12/16/2022] Open
Abstract
The barrier and fence functions of the claudin protein family are fundamental to tissue integrity and human health. Increasing evidence has linked claudins to signal transduction and tumorigenesis. The expression of claudins is frequently dysregulated in the context of neoplastic transformation. Studies have uncovered that claudins engage in nearly all aspects of tumor biology and steps of tumor development, suggesting their promise as targets for treatment or biomarkers for diagnosis and prognosis. However, claudins can be either tumor promoters or tumor suppressors depending on the context, which emphasizes the importance of taking various factors, including organ type, environmental context and genetic confounders, into account when studying the biological functions and targeting of claudins in cancer. This review discusses the complicated roles and intrinsic and extrinsic determinants of the context-specific effects of claudins in cancer.
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Affiliation(s)
- Jian Li
- Department of General Surgery, The Third Hospital of Mianyang, Sichuan Mental Health Center, Mianyang, China
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17
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Xiang Y, Zou X, Shi H, Xu X, Wu C, Zhong W, Wang J, Zhou W, Zeng X, He M, Wang Y, Huang L, Wang X. Elastic Net Models Based on DNA Copy Number Variations Predicts Clinical Features, Expression Signatures, and Mutations in Lung Adenocarcinoma. Front Genet 2021; 12:668040. [PMID: 34135942 PMCID: PMC8202527 DOI: 10.3389/fgene.2021.668040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 04/26/2021] [Indexed: 11/30/2022] Open
Abstract
In the precision medicine of lung adenocarcinoma, the identification and prediction of tumor phenotypes for specific biomolecular events are still not studied in depth. Various earlier researches sheds light on the close correlation between genetic expression signatures and DNA copy number variations (CNVs), for which analysis of CNVs provides valuable information about molecular and phenotypic changes in tumorigenesis. In this study, we propose a comprehensive analysis combining genome-wide association analysis and an Elastic Net Regression predictive model, focus on predicting the levels of many gene expression signatures in lung adenocarcinoma, based upon DNA copy number features alone. Additionally, we predicted many other key phenotypes, including clinical features (pathological stage), gene mutations, and protein expressions. These Elastic Net prediction methods can also be applied to other gene sets, thereby facilitating their use as biomarkers in monitoring therapy.
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Affiliation(s)
- Yi Xiang
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Xiaohuan Zou
- Department of Critical Care Medicine, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Huaqiu Shi
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Xueming Xu
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Caixia Wu
- First Clinical Medical College, Gannan Medical University, Ganzhou, China
| | - Wenjuan Zhong
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Jinfeng Wang
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Wenting Zhou
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Xiaoli Zeng
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Miao He
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Ying Wang
- First Clinical Medical College, Gannan Medical University, Ganzhou, China
| | - Li Huang
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
| | - Xiangcai Wang
- Department of Oncology, The First Affiliated Hospital, Gannan Medical University, Ganzhou, China
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18
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Mao R, Zhang X, Kong Y, Wu S, Huo HQ, Kong Y, Wang Z, Liu Y, Jia Z, Zhou Z. Transcriptome Regulation by Oncogenic ALK Pathway in Mammalian Cortical Development Revealed by Single-Cell RNA Sequencing. Cereb Cortex 2021; 31:3911-3924. [PMID: 33791755 DOI: 10.1093/cercor/bhab058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 02/20/2021] [Accepted: 02/20/2021] [Indexed: 12/19/2022] Open
Abstract
Precise regulation of embryonic neurodevelopment is crucial for proper structural organization and functioning of the adult brain. The key molecular machinery orchestrating this process remains unclear. Anaplastic lymphoma kinase (ALK) is an oncogenic receptor-type protein tyrosine kinase that is specifically and transiently expressed in developing nervous system. However, its role in the mammalian brain development is unknown. We found that transient embryonic ALK inactivation caused long-lasting abnormalities in the adult mouse brain, including impaired neuronal connectivity and cognition, along with delayed neuronal migration and decreased neuronal proliferation during neurodevelopment. scRNA-seq on human cerebral organoids revealed a delayed transition of cell-type composition. Molecular characterization identified a group of differentially expressed genes (DEGs) that were temporally regulated by ALK at distinct developmental stages. In addition to oncogenes, many DEGs found by scRNA-seq are associated with neurological or neuropsychiatric disorders. Our study demonstrates a pivotal role of oncogenic ALK pathway in neurodevelopment and characterized cell-type-specific transcriptome regulated by ALK for better understanding mammalian cortical development.
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Affiliation(s)
- Rui Mao
- Shanghai Key Laboratory of Psychotic Disorders, Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, 200030 China.,School of Life Science and Technology, Southeast University, Nanjing, 210096 China
| | - Xiaoyun Zhang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China.,Zhongshan Institute for Drug Discovery, The Institutes of Drug Discovery and Development, Chinese Academy of Sciences, Zhongshan, 528400 China
| | - Youyong Kong
- School of Computer Science and Engineering, Southeast University, Nanjing, 210096 China
| | - Shanshan Wu
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, 211166 China.,Institute for Stem Cell and Neural Regeneration, School of Pharmacy, Nanjing Medical University, Nanjing, 211166 China
| | - Hai-Qin Huo
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, 211166 China.,Institute for Stem Cell and Neural Regeneration, School of Pharmacy, Nanjing Medical University, Nanjing, 211166 China
| | - Yue Kong
- School of Life Science and Technology, Southeast University, Nanjing, 210096 China
| | - Zhen Wang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China
| | - Yan Liu
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, 211166 China.,Institute for Stem Cell and Neural Regeneration, School of Pharmacy, Nanjing Medical University, Nanjing, 211166 China
| | - Zhengping Jia
- Neurosciences & Mental Health, The Hospital for Sick Children, Toronto, Ontario, M5G 1X8 Canada.,Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, M5S 1A8 Canada
| | - Zikai Zhou
- Shanghai Key Laboratory of Psychotic Disorders, Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, 200030 China.,Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China.,Zhongshan Institute for Drug Discovery, The Institutes of Drug Discovery and Development, Chinese Academy of Sciences, Zhongshan, 528400 China.,Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China
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19
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Zhao A, Qi Y, Liu K. CLDN3 expression and function in pregnancy-induced hypertension. Exp Ther Med 2020; 20:3798-3806. [PMID: 32855729 PMCID: PMC7444375 DOI: 10.3892/etm.2020.9084] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 06/20/2019] [Indexed: 12/11/2022] Open
Abstract
This aim of the present study was to investigate the expression and function of claudin 3 (CLDN3) in pregnancy-induced hypertension. The mRNA expression levels of CLDN3 in the placental tissue and peripheral blood of patients with pregnancy-induced hypertension were measured using reverse transcription-quantitative PCR. Human trophoblast HTR8/SVneo cells overexpressing CLDN3 were generated using a lentiviral vector. Cell Counting kit-8 (CCK-8) assay, flow cytometry, Transwell chamber assays, confocal laser scanning microscopy and western blot analysis were performed to detect cell proliferation, invasion, migration and apoptosis, in addition to matrix metalloproteinase (MMP) expression and ERK1/2 phosphorylation. The mRNA expression levels of CLDN3 were significantly reduced in the placental tissues and peripheral blood samples of patients with pregnancy-induced hypertension compared with healthy pregnant controls. CLDN3 overexpression significantly increased HTR8/SVneo cell proliferation, invasion and migration whilst reducing apoptosis. HTR8/SVneo cells overexpressing CLDN3 also exhibited increased myofiber levels, increased MMP-2 and MMP-9 expression and increased ERK1/2 signaling activity. CLDN3 downregulation may be associated with the pathogenesis of pregnancy-induced hypertension. In conclusion, CLDN3 promotes the proliferative and invasive capabilities of human trophoblast cells, with the underlying mechanisms possibly involving upregulation of MMP expression via the ERK1/2 signaling pathway.
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Affiliation(s)
- Aixin Zhao
- Department of Obstetrics, Laiwu Maternal and Child Health Hospital, Laiwu, Shandong 271199, P.R. China
| | - Yunfang Qi
- Department of Obstetrics, Laiwu Maternal and Child Health Hospital, Laiwu, Shandong 271199, P.R. China
| | - Kun Liu
- Department of Obstetrics, Laiwu Maternal and Child Health Hospital, Laiwu, Shandong 271199, P.R. China
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20
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Zou J, Li Y, Yu J, Dong L, Husain AN, Shen L, Weber CR. Idiopathic pulmonary fibrosis is associated with tight junction protein alterations. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183205. [DOI: 10.1016/j.bbamem.2020.183205] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 01/07/2020] [Accepted: 01/18/2020] [Indexed: 02/07/2023]
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21
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Chen L, Kong R, Wu C, Wang S, Liu Z, Liu S, Li S, Chen T, Mao C, Liu S. Circ-MALAT1 Functions as Both an mRNA Translation Brake and a microRNA Sponge to Promote Self-Renewal of Hepatocellular Cancer Stem Cells. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1900949. [PMID: 32099751 PMCID: PMC7029649 DOI: 10.1002/advs.201900949] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 09/29/2019] [Indexed: 05/23/2023]
Abstract
Both circular RNAs (circRNAs) and cancer stem cells (CSCs) are separately known to be involved in cancer, but their interaction remains unclear. Here, the regulation of hepatocellular CSC self-renewal is discovered by a circRNA, circ-MALAT1, which is produced by back-splicing of a long noncoding RNA, MALAT1. Circ-MALAT1 is highly expressed in CSCs from clinical hepatocellular carcinoma samples under the mediation of an RNA-binding protein, AUF1. Surprisingly, circMALAT1 functions as a brake in ribosomes to retard PAX5 mRNA translation and promote CSCs' self-renewal by forming an unprecedented ternary complex with both ribosomes and mRNA. The discovered braking mechanism of a circRNA, termed mRNA braking, along with its more traditional role of miRNA sponging, uncovers a dual-faceted pattern of circRNA-mediated post-transcriptional regulation for maintaining a specific cell state.
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Affiliation(s)
- Liang Chen
- Department of Laboratory and DiagnosisChanghai HospitalNavy Medical University168 Changhai RoadShanghai200433China
- No. 904 Hospital of the PLA Joint Logistics Support ForceWuxi214000China
| | - Ruijiao Kong
- Shanghai Fourth People's HospitalTongji University School of Medicine1878 Sichuan North RoadShanghai200081China
| | - Cong Wu
- Department of Laboratory and DiagnosisChanghai HospitalNavy Medical University168 Changhai RoadShanghai200433China
| | - Shuo Wang
- Department of Laboratory and DiagnosisChanghai HospitalNavy Medical University168 Changhai RoadShanghai200433China
| | - Zixin Liu
- Department of Laboratory and DiagnosisChanghai HospitalNavy Medical University168 Changhai RoadShanghai200433China
| | - Shupeng Liu
- Department of Laboratory and DiagnosisChanghai HospitalNavy Medical University168 Changhai RoadShanghai200433China
| | - Shuiping Li
- Department of PathophysiologyShanghai Jiao Tong University School of MedicineShanghai200025China
| | - Tian Chen
- Department of Laboratory and DiagnosisChanghai HospitalNavy Medical University168 Changhai RoadShanghai200433China
| | - Chuanbin Mao
- Department of Chemistry and BiochemistryStephenson Life Sciences Research CenterUniversity of Oklahoma101 Stephenson ParkwayNormanOK73019‐5300USA
| | - Shanrong Liu
- Shanghai Fourth People's HospitalTongji University School of Medicine1878 Sichuan North RoadShanghai200081China
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22
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Bhat AA, Syed N, Therachiyil L, Nisar S, Hashem S, Macha MA, Yadav SK, Krishnankutty R, Muralitharan S, Al-Naemi H, Bagga P, Reddy R, Dhawan P, Akobeng A, Uddin S, Frenneaux MP, El-Rifai W, Haris M. Claudin-1, A Double-Edged Sword in Cancer. Int J Mol Sci 2020; 21:ijms21020569. [PMID: 31952355 PMCID: PMC7013445 DOI: 10.3390/ijms21020569] [Citation(s) in RCA: 76] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 01/12/2020] [Accepted: 01/13/2020] [Indexed: 12/11/2022] Open
Abstract
Claudins, a group of membrane proteins involved in the formation of tight junctions, are mainly found in endothelial or epithelial cells. These proteins have attracted much attention in recent years and have been implicated and studied in a multitude of diseases. Claudins not only regulate paracellular transepithelial/transendothelial transport but are also critical for cell growth and differentiation. Not only tissue-specific but the differential expression in malignant tumors is also the focus of claudin-related research. In addition to up- or down-regulation, claudin proteins also undergo delocalization, which plays a vital role in tumor invasion and aggressiveness. Claudin (CLDN)-1 is the most-studied claudin in cancers and to date, its role as either a tumor promoter or suppressor (or both) is not established. In some cancers, lower expression of CLDN-1 is shown to be associated with cancer progression and invasion, while in others, loss of CLDN-1 improves the patient survival. Another topic of discussion regarding the significance of CLDN-1 is its localization (nuclear or cytoplasmic vs perijunctional) in diseased states. This article reviews the evidence regarding CLDN-1 in cancers either as a tumor promoter or suppressor from the literature and we also review the literature regarding the pattern of CLDN-1 distribution in different cancers, focusing on whether this localization is associated with tumor aggressiveness. Furthermore, we utilized expression data from The Cancer Genome Atlas (TCGA) to investigate the association between CLDN-1 expression and overall survival (OS) in different cancer types. We also used TCGA data to compare CLDN-1 expression in normal and tumor tissues. Additionally, a pathway interaction analysis was performed to investigate the interaction of CLDN-1 with other proteins and as a future therapeutic target.
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Affiliation(s)
- Ajaz A. Bhat
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha 26999, Qatar; (A.A.B.); (N.S.); (S.N.); (S.H.); (S.K.Y.)
| | - Najeeb Syed
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha 26999, Qatar; (A.A.B.); (N.S.); (S.N.); (S.H.); (S.K.Y.)
| | - Lubna Therachiyil
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; (L.T.); (R.K.); (S.U.)
- Department of Pharmaceutical Sciences, College of Pharmacy, QU Health, Qatar University, Doha 2713, Qatar
| | - Sabah Nisar
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha 26999, Qatar; (A.A.B.); (N.S.); (S.N.); (S.H.); (S.K.Y.)
| | - Sheema Hashem
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha 26999, Qatar; (A.A.B.); (N.S.); (S.N.); (S.H.); (S.K.Y.)
| | - Muzafar A. Macha
- Department of Biotechnology, Central University of Kashmir, Ganderbal, Jammu and Kashmir 191201, India;
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE 68198, USA;
| | - Santosh K. Yadav
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha 26999, Qatar; (A.A.B.); (N.S.); (S.N.); (S.H.); (S.K.Y.)
| | - Roopesh Krishnankutty
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; (L.T.); (R.K.); (S.U.)
| | | | - Hamda Al-Naemi
- Laboratory Animal Research Center, Qatar University, Doha 2713, Qatar; (S.M.); (H.A.-N.)
| | - Puneet Bagga
- Center for Magnetic Resonance and Optical Imaging, Department of Radiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA; (P.B.); (R.R.)
| | - Ravinder Reddy
- Center for Magnetic Resonance and Optical Imaging, Department of Radiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA; (P.B.); (R.R.)
| | - Punita Dhawan
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE 68198, USA;
| | - Anthony Akobeng
- Department of Pediatric Gastroenterology, Sidra Medicine, Doha 26999, Qatar;
| | - Shahab Uddin
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar; (L.T.); (R.K.); (S.U.)
| | | | - Wael El-Rifai
- Department of Surgery, University of Miami Miller School of Medicine, Miami, FL 33136, USA;
| | - Mohammad Haris
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha 26999, Qatar; (A.A.B.); (N.S.); (S.N.); (S.H.); (S.K.Y.)
- Laboratory Animal Research Center, Qatar University, Doha 2713, Qatar; (S.M.); (H.A.-N.)
- Correspondence: ; Tel.: +974-4003-7407
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23
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Role of Claudin Proteins in Regulating Cancer Stem Cells and Chemoresistance-Potential Implication in Disease Prognosis and Therapy. Int J Mol Sci 2019; 21:ijms21010053. [PMID: 31861759 PMCID: PMC6982342 DOI: 10.3390/ijms21010053] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 12/11/2019] [Accepted: 12/13/2019] [Indexed: 12/11/2022] Open
Abstract
Claudins are cell–cell adhesion proteins, which are expressed in tight junctions (TJs), the most common apical cell-cell adhesion. Claudin proteins help to regulate defense and barrier functions, as well as differentiation and polarity in epithelial and endothelial cells. A series of studies have now reported dysregulation of claudin proteins in cancers. However, the precise mechanisms are still not well understood. Nonetheless, studies have clearly demonstrated a causal role of multiple claudins in the regulation of epithelial to mesenchymal transition (EMT), a key feature in the acquisition of a cancer stem cell phenotype in cancer cells. In addition, claudin proteins are known to modulate therapy resistance in cancer cells, a feature associated with cancer stem cells. In this review, we have focused primarily on highlighting the causal link between claudins, cancer stem cells, and therapy resistance. We have also contemplated the significance of claudins as novel targets in improving the efficacy of cancer therapy. Overall, this review provides a much-needed understanding of the emerging role of claudin proteins in cancer malignancy and therapeutic management.
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24
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Kage H, Flodby P, Zhou B, Borok Z. Dichotomous roles of claudins as tumor promoters or suppressors: lessons from knockout mice. Cell Mol Life Sci 2019; 76:4663-4672. [PMID: 31332482 PMCID: PMC6858953 DOI: 10.1007/s00018-019-03238-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 06/29/2019] [Accepted: 07/18/2019] [Indexed: 02/07/2023]
Abstract
Claudins are a family of integral tight junction proteins that regulate paracellular permeability in polarized epithelia. Overexpression or reduction of claudins can both promote and limit cancer progression, revealing complex dichotomous roles for claudins depending on cellular context. In contrast, recent studies demonstrating tumor formation in claudin knockout mouse models indicate a role for several claudin family members in suppressing tumor initiation. For example, intestine-specific claudin-7 knockout mice spontaneously develop atypical hyperplasia and intestinal adenomas, while claudin-18 knockout mice develop carcinomas in the lung and stomach. Claudin-4, -11, and -15 knockout mice show increased cell proliferation and/or hyperplasia in urothelium, Sertoli cells, and small intestinal crypts, respectively, possibly a precursor to cancer development. Pathways implicated in both cell proliferation and tumorigenesis include Yap/Taz and insulin-like growth factor-1 receptor (IGF-1R)/Akt pathways, among others. Consistent with the tumor suppressive role of claudins shown in mice, in humans, claudin-low breast cancer has been described as a distinct entity with a poor prognosis, and claudin-18-Rho GTPase activating protein 26 (CLDN18-ARHGAP26) fusion protein as a driver gene aberration in diffuse-type gastric cancer due to effects on RhoA. Paradoxically, claudins have also garnered interest as targets for therapy, as they are sometimes aberrantly expressed in cancer cells, which may or may not promote cancer progression. For example, a chimeric monoclonal antibody which targets cells expressing claudin-18.2 through antibody-dependent cell-mediated cytotoxicity has shown promise in multiple phase II studies. In this review, we focus on new findings supporting a tumor suppressive role for claudins during cancer initiation.
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Affiliation(s)
- Hidenori Kage
- Department of Respiratory Medicine, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Per Flodby
- Division of Pulmonary, Critical Care and Sleep Medicine and Hastings Center for Pulmonary Research, Keck School of Medicine, University of Southern California, IRD 620, M/C 9520, Los Angeles, CA, 90089-9520, USA
| | - Beiyun Zhou
- Division of Pulmonary, Critical Care and Sleep Medicine and Hastings Center for Pulmonary Research, Keck School of Medicine, University of Southern California, IRD 620, M/C 9520, Los Angeles, CA, 90089-9520, USA
| | - Zea Borok
- Division of Pulmonary, Critical Care and Sleep Medicine and Hastings Center for Pulmonary Research, Keck School of Medicine, University of Southern California, IRD 620, M/C 9520, Los Angeles, CA, 90089-9520, USA.
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25
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Díaz-Coránguez M, Liu X, Antonetti DA. Tight Junctions in Cell Proliferation. Int J Mol Sci 2019; 20:E5972. [PMID: 31783547 PMCID: PMC6928848 DOI: 10.3390/ijms20235972] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 11/22/2019] [Accepted: 11/22/2019] [Indexed: 12/23/2022] Open
Abstract
Tight junction (TJ) proteins form a continuous intercellular network creating a barrier with selective regulation of water, ion, and solutes across endothelial, epithelial, and glial tissues. TJ proteins include the claudin family that confers barrier properties, members of the MARVEL family that contribute to barrier regulation, and JAM molecules, which regulate junction organization and diapedesis. In addition, the membrane-associated proteins such as MAGUK family members, i.e., zonula occludens, form the scaffold linking the transmembrane proteins to both cell signaling molecules and the cytoskeleton. Most studies of TJ have focused on the contribution to cell-cell adhesion and tissue barrier properties. However, recent studies reveal that, similar to adherens junction proteins, TJ proteins contribute to the control of cell proliferation. In this review, we will summarize and discuss the specific role of TJ proteins in the control of epithelial and endothelial cell proliferation. In some cases, the TJ proteins act as a reservoir of critical cell cycle modulators, by binding and regulating their nuclear access, while in other cases, junctional proteins are located at cellular organelles, regulating transcription and proliferation. Collectively, these studies reveal that TJ proteins contribute to the control of cell proliferation and differentiation required for forming and maintaining a tissue barrier.
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Affiliation(s)
| | | | - David A. Antonetti
- Department of Ophthalmology and Visual Sciences, University of Michigan, Kellogg Eye Center, Ann Arbor, MI 48105, USA; (M.D.-C.); (X.L.)
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26
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Tong H, Li T, Qiu W, Zhu Z. Claudin-1 silencing increases sensitivity of liver cancer HepG2 cells to 5-fluorouracil by inhibiting autophagy. Oncol Lett 2019; 18:5709-5716. [PMID: 31788043 PMCID: PMC6865833 DOI: 10.3892/ol.2019.10967] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Accepted: 11/12/2018] [Indexed: 12/19/2022] Open
Abstract
Liver cancer is one of the most common cancer types globally. However, the acquisition of drug resistance limits the effectiveness of chemotherapy and commonly results in metastasis. Therefore, an effective therapeutic approach to target chemoresistance-associated cellular molecules is imperative. Claudin-1 (CLDN1) has previously been reported to be associated with the development of drug resistance. The present study investigated the effect of CLDN1 on the sensitivity of 5-fluorouracil (5-FU)-resistant liver cancer cells. Firstly, a 5-FU-resistant HepG2 liver cancer cell line (Hep/5FU) was developed by continuous 5-FU treatment. MTT proliferation, Transwell and Matrigel assays indicated that Hep/5FU cells were significantly resistant to 5-FU, and demonstrated increased migration and invasion abilities, compared with parental HepG2 cells. Furthermore, reverse transcription-quantitative polymerase chain reaction and western blot analysis indicated that mRNA and protein expression levels of CLDN1 were significantly increased in Hep/5FU cells, compared with HepG2 cells. CLDN1 was knocked down by transfection with small interference RNA. MTT and Annexin V-fluorescein isothiocyanate/propidium iodide assays demonstrated that CLDN1 silencing significantly inhibits proliferation and enhances apoptosis induced by 5-FU treatment in Hep/5FU cells, compared with non-silenced Hep/5FU cells. Additionally, CLDN1 silencing attenuated the migration and invasion capabilities of Hep/5FU cells. In addition, it was identified that CLDN1 silencing decreased drug resistance by inhibiting autophagy, which was associated with a decrease in the ratio of microtubule-associated protein 1A/1B-light chain 3 (LC3)-II/LC3-I and upregulation of P62. A cell proliferation assay revealed that the addition of autophagy inhibitor 3-methyladenine decreased drug resistance of Hep/5FU cells. By contrast, incubation with the autophagy agonist Rapamycin elevated drug resistance of CLDN1-silenced Hep/5FU cells. In summary, these data indicate that CLDN1 may be a potential target for resensitizing resistant liver cancer HepG2 cells to 5-FU by regulating cell autophagy.
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Affiliation(s)
- Hui Tong
- Department of General Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, P.R. China
| | - Tao Li
- Department of General Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, P.R. China
| | - Weihua Qiu
- Department of General Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, P.R. China
| | - Zhecheng Zhu
- Department of General Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, P.R. China
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27
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Chrysin enhances anticancer drug-induced toxicity mediated by the reduction of claudin-1 and 11 expression in a spheroid culture model of lung squamous cell carcinoma cells. Sci Rep 2019; 9:13753. [PMID: 31551535 PMCID: PMC6760125 DOI: 10.1038/s41598-019-50276-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 09/05/2019] [Indexed: 12/24/2022] Open
Abstract
The aberrant expression of claudins (CLDNs), which are tight junctional proteins, is seen in various solid tumors, but the regulatory mechanisms and their pathophysiological role are not well understood. Both CLDN1 and CLDN11 were highly expressed in human lung squamous cell carcinoma (SCC). Chrysin, found in high concentration in honey and propolis, decreased CLDN1 and CLDN11 expression in RERF-LC-AI cells derived from human lung SCC. The phosphorylation level of Akt was decreased by chrysin, but those of ERK1/2 and c-Jun were not. LY-294002, an inhibitor of phosphatidylinositol 3-kinase, inhibited the phosphorylation of Akt and decreased the expression levels of CLDN1 and CLDN11. The association between phosphoinositide-dependent kinase 1 (PDK1) and Akt was inhibited by chrysin, but the phosphorylation of PDK1 was not. Immunoprecipitation and quartz-crystal microbalance assays revealed that biotinylated-chrysin binds directly to Akt. The knockdown of CLDN1 and CLDN11 using small interfering RNAs increased the transepithelial flux of doxorubicin (DXR), an anthracycline anticancer drug. Similarly, both chrysin and LY-294002 increased DXR flux. Neither CLDN1 knockdown, CLDN11 knockdown, nor chrysin changed the anticancer drug-induced cytotoxicity in a two-dimensional culture model, whereas they enhanced cytotoxicity in a spheroid culture model. Taken together, chrysin may bind to Akt and inhibit its phosphorylation, resulting in the elevation of anticancer drug-induced toxicity mediated by reductions in CLDN1 and CLDN11 expression in RERF-LC-AI cells. We suggest that chrysin may be useful as an adjuvant chemotherapy in lung SCC.
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Wu J, Gao F, Xu T, Li J, Hu Z, Wang C, Long Y, He X, Deng X, Ren D, Zhou B, Dai T. CLDN1 induces autophagy to promote proliferation and metastasis of esophageal squamous carcinoma through AMPK/STAT1/ULK1 signaling. J Cell Physiol 2019; 235:2245-2259. [PMID: 31498437 DOI: 10.1002/jcp.29133] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 08/23/2019] [Indexed: 12/12/2022]
Abstract
Tight junction is a structural constitution in cell-cell adhesion and play an important role in the maintenance of permeability and integrity of normal epithelial cell barrier. The protein encoded by Claudin 1 (CLDN1), a member of the claudin family, is an integral membrane protein and a component of tight junction strands. CLDN1 has been proved to regulate the proliferation and metastasis of multiple tumors, but little is known about its role in esophageal squamous cell carcinoma (ESCC). Here, we found that CLDN1 was aberrantly increased in ESCC tissues and cell lines, and mainly distributed in the nucleus of tumor cells. Furthermore, we confirmed that CLDN1 promoted the proliferation and metastasis of ESCC by triggering autophagy both in vitro and in vivo. Mechanically, we validated that CLDN1-induced autophagy via increasing Unc-51 like autophagy activating kinase 1 (ULK1) expression through AMP-activated protein kinase (AMPK)/signal transducer and activator of transcription 1 (STAT1) signaling pathway in ESCC cells. Taken together, our findings demonstrated that aberrant expression and distribution of CLDN1 promoted the proliferation and metastasis of esophageal squamous carcinoma by triggering autophagy through AMPK/STAT1/ULK1 signaling pathway.
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Affiliation(s)
- Jian Wu
- Department of Cardio-Thoracic Surgery, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China
| | - FengXia Gao
- Department of Immunology, Basic Medicine College, South West Medical University, Luzhou, Sichuan, China
| | - Tao Xu
- Department of Cardio-Thoracic Surgery, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China
| | - Jun Li
- Department of Cardio-Thoracic Surgery, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China
| | - Zhi Hu
- Department of Cardio-Thoracic Surgery, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China
| | - Chao Wang
- Department of Cardio-Thoracic Surgery, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China.,Department of Immunology, Basic Medicine College, South West Medical University, Luzhou, Sichuan, China.,Experiment Medicine Center, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China.,Drug Discovery Research Center, Southwest Medical University, Luzhou, Sichuan, China.,Laboratory for Cardiovascular Pharmacology of Department of Pharmacology, The School of Pharmacy, Southwest Medical University, Luzhou, Sichuan, China
| | - Yang Long
- Experiment Medicine Center, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China
| | - XueMei He
- Experiment Medicine Center, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China
| | - Xin Deng
- Drug Discovery Research Center, Southwest Medical University, Luzhou, Sichuan, China.,Laboratory for Cardiovascular Pharmacology of Department of Pharmacology, The School of Pharmacy, Southwest Medical University, Luzhou, Sichuan, China
| | - DeLian Ren
- Department of Immunology, Basic Medicine College, South West Medical University, Luzhou, Sichuan, China
| | - Biao Zhou
- Department of Cardio-Thoracic Surgery, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China
| | - TianYang Dai
- Department of Cardio-Thoracic Surgery, The Affiliated Hospital of South West Medical University, Luzhou, Sichuan, China
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Tang Q, Zheng F, Liu Z, Wu J, Chai X, He C, Li L, Hann SS. Novel reciprocal interaction of lncRNA HOTAIR and miR-214-3p contribute to the solamargine-inhibited PDPK1 gene expression in human lung cancer. J Cell Mol Med 2019; 23:7749-7761. [PMID: 31475459 PMCID: PMC6815775 DOI: 10.1111/jcmm.14649] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 07/12/2019] [Accepted: 08/10/2019] [Indexed: 12/13/2022] Open
Abstract
Solamargine (SM) has been shown to have anti‐cancer properties. However, the underlying mechanism involved remains undetermined. We showed that SM inhibited the growth of non‐small cell lung cancer (NSCLC) cells, which was enhanced in cells with silencing of long non‐coding RNA (lncRNA) HOX transcript antisense RNA (HOTAIR), while it overcame by overexpression of HOTAIR. In addition, SM increased the expression of miR‐214‐3p and inhibited 3‐phosphoinositide‐dependent protein kinase‐1 (PDPK1) gene expression, which was strengthened by miR‐214‐3p mimics. Intriguingly, HOTAIR could directly bind to miR‐214‐3p and sequestered miR‐214‐3p from the target gene PDPK1. Intriguingly, overexpression of PDPK1 overcame the effects of SM on miR‐214‐3p expressions and neutralized the SM‐inhibited cell growth. Similar results were observed in vivo. In summary, our results showed that SM‐inhibited NSCLC cell growth through the reciprocal interaction between HOTAIR and miR‐214‐3p, which ultimately suppressed PDPK1 gene expression. HOTAIR effectively acted as a competing endogenous RNA (ceRNA) to stimulate the expression of target gene PDPK1. These complex interactions and feedback mechanisms contribute to the overall effect of SM. This unveils a novel molecular mechanism underlying the anti‐cancer effect of SM in human lung cancer.
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Affiliation(s)
- Qing Tang
- Laboratory of Tumor Biology, The Second Clinical Collage of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Fang Zheng
- Laboratory of Tumor Biology, The Second Clinical Collage of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zheng Liu
- Laboratory of Tumor Biology, The Second Clinical Collage of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - JingJing Wu
- Laboratory of Tumor Biology, The Second Clinical Collage of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - XiaoSu Chai
- Department of Medical Oncology, The Second Clinical Collage of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - CuenXa He
- Department of Medical Oncology, The Second Clinical Collage of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Liuning Li
- Department of Medical Oncology, The Second Clinical Collage of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Swei Sunny Hann
- Laboratory of Tumor Biology, The Second Clinical Collage of Guangzhou University of Chinese Medicine, Guangzhou, China.,Guangdong Provincial Key Laboratory of Clinical Research on Traditional Chinese Medicine Syndrome, The Second Clinical Collage of Guangzhou University of Chinese Medicine, Guangzhou, China
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30
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Xu C, Wang K, Ding YH, Li WJ, Ding L. Claudin-7 gene knockout causes destruction of intestinal structure and animal death in mice. World J Gastroenterol 2019; 25:584-599. [PMID: 30774273 PMCID: PMC6371004 DOI: 10.3748/wjg.v25.i5.584] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 01/10/2019] [Accepted: 01/18/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Claudin-7, one of the important components of cellular tight junctions, is currently considered to be expressed abnormally in colorectal inflammation and colorectal cancer. However, there is currently no effective animal model to study its specific mechanism. Therefore, we constructed three lines of Claudin-7 knockout mice using the Cre/LoxP system.
AIM To determine the function of the tumor suppressor gene Claudin-7 by generating three lines of Claudin-7 gene knockout mice.
METHODS We crossed Claudin-7-floxed mice with CMV-Cre, vil1-Cre, and villin-CreERT2 transgenic mice, and the offspring were self-crossed to obtain conventional Claudin-7 knockout mice, conditional (intestinal specific) Claudin-7 knockout mice, and inducible conditional Claudin-7 knockout mice. Intraperitoneal injection of tamoxifen into the inducible conditional Claudin-7 knockout mice can induce the knockout of Claudin-7. PCR and agarose gel electrophoresis were used to identify mouse genotypes, and Western blot was used to confirm the knockout of Claudin-7. The mental state, body length, and survival time of these mice were observed. The dying mice were sacrificed, and hematoxylin-eosin (HE) staining and immunohistochemical staining were performed to observe changes in intestinal structure and proliferation markers.
RESULTS We generated Claudin-7-floxed mice and three lines of Claudin-7 gene knockout mice using the Cre/LoxP system successfully. Conventional and intestinal specific Claudin-7 knockout mice were stunted and died during the perinatal period, and intestinal HE staining in these mice revealed mucosal gland structure disappearance and connective tissue hyperplasia with extensive inflammatory cell infiltration. The inducible conditional Claudin-7 knockout mice had a normal phenotype at birth, but after the induction with tamoxifen, they exhibited a dying state. Intestinal HE staining showed significant inflammatory cell infiltration, and atypical hyperplasia and adenoma were also observed. Intestinal immunohistochemistry analysis showed abnormal expression and distribution of Ki67, and the normal intestinal proliferation balance was disrupted. The intestinal crypt size in inducible conditional Claudin-7 knockout mice was increased compared with control mice (small intestine: 54.1 ± 2.96 vs 38.4 ± 1.63; large intestine: 44.7 ± 1.93 vs 27.4 ± 0.60; P < 0.001).
CONCLUSION The knockout of Claudin-7 in vivo causes extensive inflammation, atypical hyperplasia, and adenoma in intestinal tissue as well as animal death in mice. Claudin-7 may act as a tumor suppressor gene in the development of colorectal cancer.
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Affiliation(s)
- Chang Xu
- Department of Oncology, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, China
| | - Kun Wang
- Department of Oncology, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, China
| | - Yu-Han Ding
- Department of Oncology, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, China
| | - Wen-Jing Li
- Department of Oncology, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, China
| | - Lei Ding
- Department of Oncology, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, China
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31
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Role of p120 Catenin in Epac1-Induced Chronic Postsurgical Pain in Rats. Pain Res Manag 2019; 2019:9017931. [PMID: 30863475 PMCID: PMC6377980 DOI: 10.1155/2019/9017931] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 12/07/2018] [Accepted: 12/13/2018] [Indexed: 12/28/2022]
Abstract
Chronic postsurgical pain (CPSP) is a chronic pain state that is difficult to be treated clinically. A series of complicated changes have been produced from nociceptive stimulation to the occurrence and development of postsurgical pain. Many mechanisms remain unclear. In order to study the role of intercellular gap junctions in inducing inflammatory microenvironment at the beginning of nociceptor after operation, the model of skin/muscle incision and retraction (SMIR) was established. We observed the changes of the expression of exchange proteins directly activated by cAMP-1 (Epac1) and p120 catenin (p120), the quantities of macrophages and endothelial cells, vascular endothelial permeability, and mechanical withdrawal threshold (MWT). It was found that macrophages and endothelial cells were functionally coupled through Epac1-p120. Adhesive linkage disorder remodeled the chronic, inflammatory, and eutrophic microenvironment at the beginning of nociceptor after operation through macrophages, endothelial cells, and endothelial paracellular pathways. It might be an early event and a key step in peripheral sensitization of CPSP. The expression of p120 in muscle tissue around the incision might become a prognostic marker for the conversion of acute postsurgical pain into CPSP. Targeted intervention of Epac1-p120 might be a clinical strategy for inhibiting the conversion of acute postsurgical pain into CPSP.
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Bhat AA, Uppada S, Achkar IW, Hashem S, Yadav SK, Shanmugakonar M, Al-Naemi HA, Haris M, Uddin S. Tight Junction Proteins and Signaling Pathways in Cancer and Inflammation: A Functional Crosstalk. Front Physiol 2019; 9:1942. [PMID: 30728783 PMCID: PMC6351700 DOI: 10.3389/fphys.2018.01942] [Citation(s) in RCA: 234] [Impact Index Per Article: 46.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 12/22/2018] [Indexed: 12/14/2022] Open
Abstract
The ability of epithelial cells to organize through cell–cell adhesion into a functioning epithelium serves the purpose of a tight epithelial protective barrier. Contacts between adjacent cells are made up of tight junctions (TJ), adherens junctions (AJ), and desmosomes with unique cellular functions and a complex molecular composition. These proteins mediate firm mechanical stability, serves as a gatekeeper for the paracellular pathway, and helps in preserving tissue homeostasis. TJ proteins are involved in maintaining cell polarity, in establishing organ-specific apical domains and also in recruiting signaling proteins involved in the regulation of various important cellular functions including proliferation, differentiation, and migration. As a vital component of the epithelial barrier, TJs are under a constant threat from proinflammatory mediators, pathogenic viruses and bacteria, aiding inflammation and the development of disease. Inflammatory bowel disease (IBD) patients reveal loss of TJ barrier function, increased levels of proinflammatory cytokines, and immune dysregulation; yet, the relationship between these events is partly understood. Although TJ barrier defects are inadequate to cause experimental IBD, mucosal immune activation is changed in response to augmented epithelial permeability. Thus, the current studies suggest that altered barrier function may predispose or increase disease progression and therapies targeted to specifically restore the barrier function may provide a substitute or supplement to immunologic-based therapies. This review provides a brief introduction about the TJs, AJs, structure and function of TJ proteins. The link between TJ proteins and key signaling pathways in cell proliferation, transformation, and metastasis is discussed thoroughly. We also discuss the compromised intestinal TJ integrity under inflammatory conditions, and the signaling mechanisms involved that bridge inflammation and cancer.
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Affiliation(s)
- Ajaz A Bhat
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha, Qatar
| | - Srijayaprakash Uppada
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, United States
| | - Iman W Achkar
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha, Qatar
| | - Sheema Hashem
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha, Qatar
| | - Santosh K Yadav
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha, Qatar
| | | | - Hamda A Al-Naemi
- Laboratory Animal Research Center, Qatar University, Doha, Qatar.,Department of Biological and Environmental Sciences, Qatar University, Doha, Qatar
| | - Mohammad Haris
- Division of Translational Medicine, Research Branch, Sidra Medicine, Doha, Qatar.,Laboratory Animal Research Center, Qatar University, Doha, Qatar
| | - Shahab Uddin
- Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha, Qatar
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Okui N, Kamata Y, Sagawa Y, Kuhara A, Hayashi K, Uwagawa T, Homma S, Yanaga K. Claudin 7 as a possible novel molecular target for the treatment of pancreatic cancer. Pancreatology 2019; 19:88-96. [PMID: 30416041 DOI: 10.1016/j.pan.2018.10.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 08/22/2018] [Accepted: 10/22/2018] [Indexed: 12/11/2022]
Abstract
BACKGROUND/OBJECTIVES Pancreatic cancer consists of various subpopulations of cells, some of which have aggressive proliferative properties. The molecules responsible for the aggressive proliferation of pancreatic cancer may become molecular targets for the therapies against pancreatic cancer. METHODS From a human pancreatic cancer cell line, MIA PaCa-2, MIA PaCa-2-A cells with an epithelial morphology and MIA PaCa-2-R cells with a non-epithelial morphology were clonogenically isolated by the limiting dilution method. Gene expression of these subpopulations was analyzed by DNA microarray. Gene knockdown was performed using siRNA. RESULTS Although the MIA PaCa-2-A and MIA PaCa-2-R cells displayed the same DNA short tandem repeat (STR) pattern identical to that of the parental MIA PaCa-2 cells, the MIA PaCa-2-A cells were more proliferative than the MIA PaCa-2-R cells both in culture and in tumor xenografts generated in immunodeficient mice. Furthermore, the MIA PaCa-2-A cells were more resistant to gemcitabine than the MIA PaCa-2-R cells. DNA microarray analysis revealed a high expression of claudin (CLDN) 7 in the MIA PaCa-2-A cells, as opposed to a low expression in the MIA PaCa-2-R cells. The knockdown of CLDN7 in the MIA PaCa-2-A cells induced a marked inhibition of proliferation. The MIA PaCa-2-A cells in which CLDN7 was knocked down exhibited a decreased expression of phosphorylated extracellular signal-regulated kinase (p-Erk)1/2 and G1 cell cycle arrest. CONCLUSIONS CLDN7 may be expressed in the rapidly proliferating and dominant cell population in human pancreatic cancer tissues and may be a novel molecular target for the treatment of pancreatic cancer.
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Affiliation(s)
- Norimitsu Okui
- Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Yuko Kamata
- Division of Oncology, Research Center for Medical Sciences, The Jikei University School of Medicine, Tokyo, Japan
| | - Yukiko Sagawa
- Division of Oncology, Research Center for Medical Sciences, The Jikei University School of Medicine, Tokyo, Japan
| | - Akiko Kuhara
- Division of Oncology, Research Center for Medical Sciences, The Jikei University School of Medicine, Tokyo, Japan
| | - Kazumi Hayashi
- Division of Clinical Oncology and Hematology, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Tadashi Uwagawa
- Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
| | - Sadamu Homma
- Division of Oncology, Research Center for Medical Sciences, The Jikei University School of Medicine, Tokyo, Japan.
| | - Katsuhiko Yanaga
- Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
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Luo J, Chimge NO, Zhou B, Flodby P, Castaldi A, Firth AL, Liu Y, Wang H, Yang C, Marconett CN, Crandall ED, Offringa IA, Frenkel B, Borok Z. CLDN18.1 attenuates malignancy and related signaling pathways of lung adenocarcinoma in vivo and in vitro. Int J Cancer 2018; 143:3169-3180. [PMID: 30325015 PMCID: PMC6263834 DOI: 10.1002/ijc.31734] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 05/21/2018] [Accepted: 06/11/2018] [Indexed: 12/18/2022]
Abstract
Claudins are a family of transmembrane proteins integral to the structure and function of tight junctions (TJ). Disruption of TJ and alterations in claudin expression are important features of invasive and metastatic cancer cells. Expression of CLDN18.1, the lung-specific isoform of CLDN18, is markedly decreased in lung adenocarcinoma (LuAd). Furthermore, we recently observed that aged Cldn18 -/- mice have increased propensity to develop LuAd. We now demonstrate that CLDN18.1 expression correlates inversely with promoter methylation and with LuAd patient mortality. In addition, when restored in LuAd cells that have lost expression, CLDN18.1 markedly attenuates malignant properties including xenograft tumor growth in vivo as well as cell proliferation, migration, invasion and anchorage-independent colony formation in vitro. Based on high throughput analyses of Cldn18 -/- murine lung alveolar epithelial type II cells, as well as CLDN18.1-repleted human LuAd cells, we hypothesized and subsequently confirmed by Western analysis that CLDN18.1 inhibits insulin-like growth factor-1 receptor (IGF-1R) and AKT phosphorylation. Consistent with recent data in Cldn18 -/- knockout mice, expression of CLDN18.1 in human LuAd cells also decreased expression of transcriptional co-activator with PDZ-binding motif (TAZ) and Yes-associated protein (YAP) and their target genes, contributing to its tumor suppressor activity. Moreover, analysis of LuAd cells in which YAP and/or TAZ are silenced with siRNA suggests that inhibition of TAZ, and possibly YAP, is also involved in CLDN18.1-mediated AKT inactivation. Taken together, these data indicate a tumor suppressor role for CLDN18.1 in LuAd mediated by a regulatory network that encompasses YAP/TAZ, IGF-1R and AKT signaling.
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Affiliation(s)
- Jiao Luo
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles, CA, USA
| | - Nyam-Osor Chimge
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles, CA, USA
| | - Beiyun Zhou
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles, CA, USA
- Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA
| | - Per Flodby
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles, CA, USA
| | - Alessandra Castaldi
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles, CA, USA
| | - Amy L. Firth
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Yixin Liu
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles, CA, USA
| | - Hongjun Wang
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles, CA, USA
| | - Chenchen Yang
- Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA
- Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Crystal N. Marconett
- Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA
- Department of Biochemistry and Molecular Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Edward D. Crandall
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles, CA, USA
- Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Department of Chemical Engineering and Materials Science, Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA
| | - Ite A. Offringa
- Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA
- Department of Biochemistry and Molecular Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Baruch Frenkel
- Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA
- Department of Biochemistry and Molecular Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Zea Borok
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Hastings Center for Pulmonary Research, University of Southern California, Los Angeles, CA, USA
- Will Rogers Institute Pulmonary Research Center, University of Southern California, Los Angeles, CA, USA
- Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA
- Department of Biochemistry and Molecular Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Department of Chemical Engineering and Materials Science, Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA
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Zang H, Zhang Z, Liu Q, Xiao H, Sun T, Guo E, Zhang L, Gong B. Oxymatrine improves L-arginine-induced acute pancreatitis related intestinal injury via regulating AKT/NFkB and claudins signaling. Med Chem Res 2018. [DOI: 10.1007/s00044-018-2269-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wang K, Xu C, Li W, Ding L. Emerging clinical significance of claudin-7 in colorectal cancer: a review. Cancer Manag Res 2018; 10:3741-3752. [PMID: 30288105 PMCID: PMC6159786 DOI: 10.2147/cmar.s175383] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Tight junctions (TJs) play an important role in maintaining cell polarity and regulating cell permeability. In recent years, many studies have shown that TJ proteins, especially claudin-7, are closely related to inflammation and the development of various malignant tumors. Claudin-7 plays a significant role in maintaining the physiological functions and pathological conditions of the TJ barrier. The dysregulation of claudin-7 plays a tumor suppressor role or conversely has carcinogenic effects in different target tissues or cells, but the exact underlying mechanism is still unclear. In this review, we will summarize the expression pattern of claudin-7 in tumors, focusing on the expression and regulation of claudin-7 in colorectal cancer and discussing the correlation between claudin-7 and invasion, metastasis and epithelial–mesenchymal transition (EMT) in colorectal cancer. The construction of Cldn7−/− mice and conventional claudin-7 knockout mouse models has helped determine the mechanisms by which claudin-7 promotes tumorigenesis. Elucidation of the expression and subcellular localization of claudin-7 under pathological conditions will help develop claudin-7 as a useful biomarker for detecting and diagnosing cancer, and thus may help combat the occurrence, development, and invasion of cancers.
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Affiliation(s)
- Kun Wang
- Department of Oncology, Beijing Shijitan Hospital, Capital Medical University, Beijing, 100038, People's Republic of China,
| | - Chang Xu
- Department of Oncology, Beijing Shijitan Hospital, Capital Medical University, Beijing, 100038, People's Republic of China,
| | - Wenjing Li
- Department of Oncology, Beijing Shijitan Hospital, Capital Medical University, Beijing, 100038, People's Republic of China,
| | - Lei Ding
- Department of Oncology, Beijing Shijitan Hospital, Capital Medical University, Beijing, 100038, People's Republic of China,
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Different concentrations of lipopolysaccharide regulate barrier function through the PI3K/Akt signalling pathway in human pulmonary microvascular endothelial cells. Sci Rep 2018; 8:9963. [PMID: 29967433 PMCID: PMC6028427 DOI: 10.1038/s41598-018-28089-3] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 06/14/2018] [Indexed: 12/15/2022] Open
Abstract
Lipopolysaccharide (LPS) can lead to vascular endothelial barrier dysfunction, which often results in acute lung injury and acute respiratory distress syndrome. However, the effects of different concentrations of LPS on human pulmonary microvascular endothelial barrier function and the involvement of the phosphatidylinositol-3-kinase-serine/threonine kinase (PI3K/Akt) pathway in this process remain unclear. Human pulmonary microvascular endothelial cells (HPMECs) were stimulated with different doses of LPS, and barrier function was examined by determining cell monolayer permeability, cell migration, and the expression of intercellular junction proteins (VE-Cadherin, Claudin-5, and Connexin-43). LY294002 was used to inhibit PI3K to verify the role of the PI3K/Akt pathway in the regulation of barrier function in HPMECs stimulated by LPS. Low doses of LPS increased HPMEC migration, up-regulated VE-Cadherin and Claudin-5 expression, down-regulated Connexin-43 expression, and promoted Akt phosphorylation, which could collectively decrease monolayer permeability. In contrast, high doses of LPS suppressed HPMEC migration, down-regulated the expression of VE-Cadherin and Claudin-5, up-regulated Connexin-43 expression, and reduced Akt phosphorylation, which could collectively increase monolayer permeability. LPS has a biphasic effect on HPMEC barrier function through the PI3K/Akt pathway, and this effect is concentration-dependent.
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Chung YH, Li SC, Kao YH, Luo HL, Cheng YT, Lin PR, Tai MH, Chiang PH. MiR-30a-5p Inhibits Epithelial-to-Mesenchymal Transition and Upregulates Expression of Tight Junction Protein Claudin-5 in Human Upper Tract Urothelial Carcinoma Cells. Int J Mol Sci 2017; 18:ijms18081826. [PMID: 28829370 PMCID: PMC5578210 DOI: 10.3390/ijms18081826] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 08/14/2017] [Accepted: 08/18/2017] [Indexed: 12/20/2022] Open
Abstract
The involvement of microRNAs (miRNAs) in cancer development and their potential as prognostic biomarkers are becoming increasingly known. However, the signature of miRNAs and their regulatory roles in tumorigenesis of upper tract urothelial carcinoma (UTUC) remain to be elucidated. This study aimed to profile the miRNA expression pattern in UTUC tumor tissues and identify candidate miRNAs with prognostic and/or therapeutic functions. Methods and Results: We collected 22 UTUC tissue and adjacent normal tissues samples from patients who underwent nephroureterectomy. The miRNAs signatures of three selected UTUC samples using next-generation sequencing showed that miR-30a-5p was significantly downregulated in UTUC tumors compared to adjacent normal tissues. The differentially-expressed miRNAs were specifically validated by quantitative real-time polymerase chain reaction. In addition, the miRNA expression signatures were analyzed with the transcriptome profile characterized by microarray. Further in vitro studies indicated that overexpression of miR-30a-5p significantly suppressed proliferation, migration, and epithelial-to-mesenchymal transition (EMT) in cultured BFTC-909 UTUC cells. As a potential target gene of miR-30a-5p in the tight junction pathway suggested by the pathway enrichment analysis, the reduced expression of tight junction protein claudin-5 in UTUC cells was demonstrated to be upregulated by miR-30a-5p genetic delivery. Conclusions: Taken together, our findings demonstrated that miR-30a-5p inhibits proliferation, metastasis, and EMT, and upregulates the expression of tight junction claudin-5 in UTUC cells. Thus, miR-30a-5p may provide a promising therapeutic strategy for UTUC treatment.
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Affiliation(s)
- Yueh-Hua Chung
- Institute of Biomedical Sciences, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
| | - Sung-Chou Li
- Genomics and Proteomics Core Laboratory, Department of Medical Research, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 83301, Taiwan.
| | - Ying-Hsien Kao
- Department of Medical Research, E-Da Hospital, Kaohsiung 82445, Taiwan.
| | - Hao-Lun Luo
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 83301, Taiwan.
| | - Yuan-Tso Cheng
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 83301, Taiwan.
| | - Pey-Ru Lin
- Division of Hepato-Gastroenterology, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 83301, Taiwan.
| | - Ming-Hong Tai
- Institute of Biomedical Sciences, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
| | - Po-Hui Chiang
- Department of Urology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 83301, Taiwan.
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Zhao Z, Li J, Jiang Y, Xu W, Li X, Jing W. CLDN1 Increases Drug Resistance of Non-Small Cell Lung Cancer by Activating Autophagy via Up-Regulation of ULK1 Phosphorylation. Med Sci Monit 2017; 23:2906-2916. [PMID: 28614291 PMCID: PMC5479443 DOI: 10.12659/msm.904177] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 05/08/2017] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND The aim of this study was to investigate the expression of CLDN1 in non-small cell lung cancer (NSCLC) and its mechanism of action in cisplatin resistance. MATERIAL AND METHODS A total of 55 patients with NSCLC admitted to our hospital between October 2013 and October 2015 were included. NSCLC tissues and tumor-adjacent tissues (≥5 cm from tumor edge) were collected. Among the 55 patients, 37 had adenocarcinoma and 18 had squamous cell carcinoma. Quantitative real-time polymerase chain reaction was used to determine mRNA expression, and protein expression was examined using Western blotting. CCK-8 assay was used to determine cell proliferation and Transwell assay was used to detect migration and invasion of the cells. Confocal microscopy was used to observe autophagosomes. RESULTS Increased CLDN1 expression promoted the development and metastasis of NSCLC. CLDN1 expression in A549/CDDP cells was up-regulated at both transcriptional and translational levels. Reduced CLDN1 expression decreased the drug resistance, proliferation, migration, and invasion abilities of A549/CDDP cells. Decreased CLDN1 expression promoted the apoptosis of A549/CDDP cells. CLDN1 enhanced CDDP drug resistance of A549 cells by activating autophagy. CLDN1 promoted the autophagy of A549 cells by up-regulating the phosphorylation level of ULK1. CONCLUSIONS The present study demonstrates that expression of CLDN1 in NSCLC is up-regulated and it is correlated with clinicopathological features. CLDN1 activates autophagy through up-regulation of ULK1 phosphorylation and promotes drug resistance of NSCLC cells to CDDP.
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Affiliation(s)
- Zhenhuan Zhao
- Department of Pharmacy, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, P.R. China
| | - Jing Li
- Department of Pharmacy, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, P.R. China
| | - Yan Jiang
- Intensive Care Unit, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, P.R. China
| | - Wen Xu
- Department of Pharmacy, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, P.R. China
| | - Xin Li
- Department of Pharmacy, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, P.R. China
| | - Weili Jing
- Intensive Care Unit, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, P.R. China
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Ashikari D, Takayama KI, Obinata D, Takahashi S, Inoue S. CLDN8, an androgen-regulated gene, promotes prostate cancer cell proliferation and migration. Cancer Sci 2017; 108:1386-1393. [PMID: 28474805 PMCID: PMC5497721 DOI: 10.1111/cas.13269] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 04/25/2017] [Accepted: 04/30/2017] [Indexed: 01/11/2023] Open
Abstract
The proliferation of prostate cancer cells is controlled by the androgen receptor (AR) signaling pathway. However, the function of AR target genes has not been fully elucidated. In previous studies, we have identified global AR binding sites and AR target genes in prostate cancer cells. Here, we focused on Claudin 8 (CLDN8), a protein constituting tight junctions in cell membranes. We found one AR binding site in the promoter region and two functional androgen‐responsive elements in the sequence. Reporter assay revealed that transcriptional activation of the CLDN8 promoter by androgen is dependent on these androgen‐responsive elements. Furthermore, CLDN8 mRNA is induced by androgen time‐dependently and the induction is blocked by AR inhibitor, suggesting that AR is involved in the transcriptional activation. In addition, our functional analyses by overexpression and knockdown of CLDN8 mRNA indicate that CLDN8 promotes prostate cancer cell proliferation and migration. Claudin 8 was overexpressed in prostate cancer clinical samples compared to benign tissues. Furthermore, we found that CLDN8 regulates intracellular signal transduction and stabilizes the cytoskeleton. Taken together, these results indicate that CLDN8 functions as an AR downstream signal to facilitate the progression of prostate cancer. Claudin 8 may be a novel molecular target for prostate cancer therapy.
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Affiliation(s)
- Daisaku Ashikari
- Department of Anti-Aging Medicine, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.,Department of Urology, Nihon University School of Medicine, Tokyo, Japan
| | - Ken-Ichi Takayama
- Department of Anti-Aging Medicine, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.,Department of Functional Biogerontology, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - Daisuke Obinata
- Department of Urology, Nihon University School of Medicine, Tokyo, Japan
| | - Satoru Takahashi
- Department of Urology, Nihon University School of Medicine, Tokyo, Japan
| | - Satoshi Inoue
- Department of Anti-Aging Medicine, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.,Department of Functional Biogerontology, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan.,Division of Gene Regulation and Signal Transduction, Research Center for Genomic Medicine, Saitama Medical University, Saitama, Japan
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