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Dai Z, Ji H, Zheng A, Huang AL, Tang KF. Protocol for isolating small cytosolic dsDNA from cultured murine cells. STAR Protoc 2024; 5:102998. [PMID: 38573862 PMCID: PMC11000180 DOI: 10.1016/j.xpro.2024.102998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 02/08/2024] [Accepted: 03/19/2024] [Indexed: 04/06/2024] Open
Abstract
We recently identified a class of small cytosolic double-stranded DNA (scDNA) approximately 20-40 bp in size in human and mouse cells. Here, we present a protocol for scDNA isolation from cultured murine cells. We describe steps for cytosolic compartment separation, DNA isolation in the cytosolic fraction using phenol-chloroform extraction, and ethanol precipitation. We then detail procedures for denaturing purified cytosolic DNA through urea polyacrylamide gel electrophoresis and obtaining scDNA in the cytosolic DNA fraction via gel purification. For complete details on the use and execution of this protocol, please refer to Liu et al.1.
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Affiliation(s)
- Zhizheng Dai
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Hongyu Ji
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Anqi Zheng
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Ai-Long Huang
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China.
| | - Kai-Fu Tang
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China.
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2
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Xie C, Chen X, Chen Y, Wang X, Zuo J, Zheng A, Luo Z, Cheng X, Zhong S, Jiang J, Du J, Zhao Y, Jiang P, Zhang W, Chen D, Pan H, Shen L, Zhu B, Zhou Q, Xu Y, Tang KF. Mutual communication between radiosensitive and radioresistant esophageal cancer cells modulates their radiosensitivity. Cell Death Dis 2023; 14:846. [PMID: 38114473 PMCID: PMC10730729 DOI: 10.1038/s41419-023-06307-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 11/05/2023] [Accepted: 11/14/2023] [Indexed: 12/21/2023]
Abstract
Radiotherapy is an important treatment modality for patients with esophageal cancer; however, the response to radiation varies among different tumor subpopulations due to tumor heterogeneity. Cancer cells that survive radiotherapy (i.e., radioresistant) may proliferate, ultimately resulting in cancer relapse. However, the interaction between radiosensitive and radioresistant cancer cells remains to be elucidated. In this study, we found that the mutual communication between radiosensitive and radioresistant esophageal cancer cells modulated their radiosensitivity. Radiosensitive cells secreted more exosomal let-7a and less interleukin-6 (IL-6) than radioresistant cells. Exosomal let-7a secreted by radiosensitive cells increased the radiosensitivity of radioresistant cells, whereas IL-6 secreted by radioresistant cells decreased the radiosensitivity of radiosensitive cells. Although the serum levels of let-7a and IL-6 before radiotherapy did not vary significantly between patients with radioresistant and radiosensitive diseases, radiotherapy induced a more pronounced decrease in serum let-7a levels and a greater increase in serum IL-6 levels in patients with radioresistant cancer compared to those with radiosensitive cancer. The percentage decrease in serum let-7a and the percentage increase in serum IL-6 levels at the early stage of radiotherapy were inversely associated with tumor regression after radiotherapy. Our findings suggest that early changes in serum let-7a and IL-6 levels may be used as a biomarker to predict the response to radiotherapy in patients with esophageal cancer and provide new insights into subsequent treatments.
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Affiliation(s)
- Congying Xie
- Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, The Second Affiliated Hospital of Wenzhou Medical University, 325000, Wenzhou, Zhejiang, P. R. China
- Wenzhou key Laboratory of basic science and translational research of radiation oncology, 325000, Wenzhou, Zhejiang, P. R. China
| | - Xiao Chen
- Key Laboratory of Precision Diagnosis and Treatment for Hepatobiliary and Pancreatic Tumor of Zhejiang Province, The Second Affiliated Hospital, Zhejiang University School of Medicine, 310009, Hangzhou, Zhejiang, P. R. China
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Yueming Chen
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Xingyue Wang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Jiwei Zuo
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Anqi Zheng
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Zhicheng Luo
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Xiaoxiao Cheng
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Shouhui Zhong
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Jiayu Jiang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Jizao Du
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Yuemei Zhao
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Peipei Jiang
- Department of Breast Surgery, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Wei Zhang
- Department of Breast Surgery, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Didi Chen
- Department of Radiation Oncology, The First Affiliated Hospital of Wenzhou Medical University, 325015, wenzhou, Zhejiang, P. R. China
| | - Huanle Pan
- Department of Radiotherapy Center, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Lanxiao Shen
- Department of Radiotherapy Center, The First Affiliated Hospital of Wenzhou Medical University, 325015, Wenzhou, Zhejiang, P. R. China
| | - Baoling Zhu
- Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, The Second Affiliated Hospital of Wenzhou Medical University, 325000, Wenzhou, Zhejiang, P. R. China
- Wenzhou key Laboratory of basic science and translational research of radiation oncology, 325000, Wenzhou, Zhejiang, P. R. China
| | - Qingyu Zhou
- Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, The Second Affiliated Hospital of Wenzhou Medical University, 325000, Wenzhou, Zhejiang, P. R. China
- Wenzhou key Laboratory of basic science and translational research of radiation oncology, 325000, Wenzhou, Zhejiang, P. R. China
| | - Yunsheng Xu
- Department of Dermatovenereology, The Seventh Affiliated Hospital, Sun Yat-sen University, 518107, Shenzhen, P. R. China
| | - Kai-Fu Tang
- Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, The Second Affiliated Hospital of Wenzhou Medical University, 325000, Wenzhou, Zhejiang, P. R. China.
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, 400016, Chongqing, Chongqing, P. R. China.
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Zuo J, Zheng A, Wang X, Luo Z, Chen Y, Cheng X, Zhao Y, Zhou X, Tang KF, Du X. Upregulation of CELSR1 expression promotes ovarian cancer cell proliferation, migration, and invasion. Med Oncol 2023; 41:10. [PMID: 38070011 DOI: 10.1007/s12032-023-02232-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Accepted: 10/25/2023] [Indexed: 12/18/2023]
Abstract
Cadherin epidermal growth factor and laminin-G seven-pass G-type receptor 1 (CELSR1) is a planar cell polarity protein involved in the transmission of directional cues to align either individual cells within an epithelial sheet or multicellular clusters. CELSR1 has been suggested to play a role in glioma, breast cancer, and chronic lymphocytic leukemia development; however, whether it has a role in the pathogenesis of ovarian cancer remains unknown. The aim of this study was to determine the role of CELSR1 in ovarian cancer and elucidate its underlying molecular mechanisms. By analyzing gene expression data downloaded from the Cancer Genome Atlas database, we found that CELSR1 expression was upregulated in ovarian cancer tissues compared to that in normal ovarian tissues. High CELSR1 expression levels were associated with poor prognosis in patients with ovarian cancer. Cell proliferation, scratch, and transwell assays revealed that CELSR1 promoted the proliferation, migration, and invasion of ovarian cancer cells in vitro. In addition, transcriptome sequencing analysis revealed that CELSR1 knockdown in T29H cells resulted in the dysregulation of the expression of 1320 genes. Further analysis revealed that genes involved in proliferation- and migration-associated signaling pathways were regulated by CELSR1. Our study demonstrates that CELSR1 is highly expressed in ovarian cancer cells and regulates their proliferation and migration, suggesting its potential as a diagnostic marker and therapeutic target.
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Affiliation(s)
- Jiwei Zuo
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Anqi Zheng
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Xingyue Wang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Zhicheng Luo
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Yueming Chen
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Xiaoxiao Cheng
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Yuemei Zhao
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Xian Zhou
- Department of Radiation Oncology, Chongqing University Cancer Hospital, 181, Hanyu Road, Shapingba District, Chongqing, 400030, People's Republic of China
| | - Kai-Fu Tang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China.
- Key Laboratory of Molecular Biology On Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China.
| | - Xing Du
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, People's Republic of China.
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4
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Luo YW, Ji H, Huang AL, Tang KF. Communication between small cytosolic dsDNA and autophagy inhibits CGAS (cyclic GMP-AMP synthase) activation. Autophagy 2023:1-3. [PMID: 38013411 DOI: 10.1080/15548627.2023.2285612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 11/15/2023] [Indexed: 11/29/2023] Open
Abstract
The CGAS (cyclic GMP-AMP synthase)-STING1 (stimulator of interferon response cGAMP interactor 1) pathway is an important innate immune pathway that induces proinflammatory cytokine production following stimulation with dsDNA > 45 bp. We recently identified a class of ~ 20-40 bp small cytosolic dsDNA (scDNA) that blocks CGAS-STING1 activation. In this punctum, we discuss the mechanism underlying the inhibition of CGAS-STING1 activation via scDNA. scDNA binds to CGAS but cannot activate its enzymatic activity. It competes with dsDNA > 45 bp for binding with CGAS to inhibit CGAS-STING1 activation. Moreover, scDNA activates macroautophagy/autophagy and induces the autophagic degradation of STING1 and long dsDNA. Autophagy then increases scDNA levels, driving a feedback loop that accelerates the degradation of STING1 and long cytosolic dsDNA. These findings reveal that mutual communication between scDNA and autophagy inhibits CGAS-STING1 activation following stimulation with dsDNA > 45 bp.
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Affiliation(s)
- Yu-Wei Luo
- Key Laboratory of Molecular Biology on Infectious Disease, Ministry of Education, Chongqing Medical University, Chongqing, P.R. China
| | - Hongyu Ji
- Key Laboratory of Molecular Biology on Infectious Disease, Ministry of Education, Chongqing Medical University, Chongqing, P.R. China
| | - Ai-Long Huang
- Key Laboratory of Molecular Biology on Infectious Disease, Ministry of Education, Chongqing Medical University, Chongqing, P.R. China
| | - Kai-Fu Tang
- Key Laboratory of Molecular Biology on Infectious Disease, Ministry of Education, Chongqing Medical University, Chongqing, P.R. China
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5
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Liu Y, Chen X, Zhao Y, Wang XY, Luo YW, Chen L, Wang W, Zhong S, Hu M, Dai Z, Jiang J, Wang X, Ji H, Cheng XX, Zheng A, Zuo J, Liu H, Ma D, Luo Z, Cao F, Hu S, Huang AL, Tang KF. Small cytosolic double-stranded DNA represses cyclic GMP-AMP synthase activation and induces autophagy. Cell Rep 2023; 42:112852. [PMID: 37481718 DOI: 10.1016/j.celrep.2023.112852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 04/28/2023] [Accepted: 07/07/2023] [Indexed: 07/25/2023] Open
Abstract
The cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING) pathway is a major mediator of inflammation following stimulation with >45 bp double-stranded DNA (dsDNA). Herein, we identify a class of ∼20-40 bp small cytosolic dsDNA (scDNA) molecules that compete with long dsDNA (200-1,500 bp herring testis [HT]-DNA) for binding to cGAS, thus repressing HT-DNA-induced cGAS activation. The scDNA promotes cGAS and Beclin-1 interaction, releasing Rubicon, a negative regulator of phosphatidylinositol 3-kinase class III (PI3KC3), from the Beclin-1-PI3KC3 complex. This leads to PI3KC3 activation and induces autophagy, causing degradation of STING and long cytosolic dsDNA. Moreover, DNA damage decreases, and autophagy inducers increase scDNA levels. scDNA transfection and treatment with autophagy inducers attenuate DNA damage-induced cGAS activation. Thus, scDNA molecules serve as effective brakes for cGAS activation, preventing excessive inflammatory cytokine production following DNA damage. Our findings may have therapeutic implications for cytosolic DNA-associated inflammatory diseases.
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Affiliation(s)
- Yao Liu
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Xiao Chen
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China; Key Laboratory of Precision Diagnosis and Treatment for Hepatobiliary and Pancreatic Tumor of Zhejiang Province, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
| | - Yuemei Zhao
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Xing-Yue Wang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Yu-Wei Luo
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Lina Chen
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Weiyun Wang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Shouhui Zhong
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Meizhen Hu
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Zhizheng Dai
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Jiayu Jiang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Xin Wang
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Hongyu Ji
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Xiao-Xiao Cheng
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Anqi Zheng
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Jiwei Zuo
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Hui Liu
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Di Ma
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Zhicheng Luo
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Fang Cao
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Shanshan Hu
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Ai-Long Huang
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China.
| | - Kai-Fu Tang
- Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China.
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Hu MZ, Dai ZZ, Ji HY, Zheng AQ, Liang H, Shen MM, Liu JN, Tang KF, Zhu SJ, Wang KJ. Upregulation of FAM50A promotes cancer development. Med Oncol 2023; 40:217. [PMID: 37393403 DOI: 10.1007/s12032-023-02072-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 05/24/2023] [Indexed: 07/03/2023]
Abstract
FAM50A encodes a nuclear protein involved in mRNA processing; however, its role in cancer development remains unclear. Herein, we conducted an integrative pan-cancer analysis using The Cancer Genome Atlas, Genotype-Tissue Expression, and the Clinical Proteomic Tumor Analysis Consortium databases. Based on the gene expression data from TCGA and GTEx databases, we compared FAM50A mRNA levels in 33 types of human cancer tissues to those in corresponding normal tissues and found that FAM50A mRNA level was upregulated in 20 of the 33 types of common cancer tissues. Then, we compared the DNA methylation status of the FAM50A promoter in tumor tissues to that in corresponding normal tissues. FAM50A upregulation was accompanied by promoter hypomethylation in 8 of the 20 types of tumor tissues, suggesting that promoter hypomethylation contributes to the upregulation of FAM50A in these cancer tissues. Elevated FAM50A expression in 10 types of cancer tissues was associated with poor prognosis in patients with cancer. FAM50A expression was positively correlated with CD4+ T-lymphocyte and dendritic cell infiltration in cancer tissues but was negatively correlated with CD8+ T-cell infiltration in cancer tissues. FAM50A knockdown caused DNA damage, induced interferon beta and interleukin-6 expression, and repressed the proliferation, invasion, and migration of cancer cells. Our findings indicate that FAM50A might be useful in cancer detection, reveal insights into its role in cancer development, and may contribute to the development of cancer diagnostics and treatments.
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Affiliation(s)
- Mei-Zhen Hu
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Zhi-Zheng Dai
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Hong-Yu Ji
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - An-Qi Zheng
- The First Affiliated Hospital of Wenzhou Medical University, Zhejiang, 325015, People's Republic of China
| | - Hang Liang
- School of Basic Medicine, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Mei-Mei Shen
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Choqing, 400016, People's Republic of China
| | - Jun-Nan Liu
- School of Basic Medicine, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Kai-Fu Tang
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Shu-Juan Zhu
- School of Basic Medicine, Chongqing Medical University, Chongqing, 400016, People's Republic of China.
| | - Ke-Jian Wang
- School of Basic Medicine, Chongqing Medical University, Chongqing, 400016, People's Republic of China.
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7
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Wang ZJ, Dai ZZ, Hu MZ, Liu JN, Liang H, Shen MM, Zhu SJ, Sheng HJ, Gao J, Huang AL, Tang KF. Upregulation of TUBG1 expression promotes hepatocellular carcinoma development. Med Oncol 2023; 40:96. [PMID: 36792863 DOI: 10.1007/s12032-023-01966-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 02/01/2023] [Indexed: 02/17/2023]
Abstract
Tubulin γ-1 (TUBG1) is a highly conserved component of the centrosome and its deregulation is involved in the development of several types of cancer. However, the role of TUBG1 in hepatocellular carcinoma (HCC) remains unclear. In this study, we found that TUBG1 was upregulated in human HCC cells and tissues and that TUBG1 upregulation was associated with promoter hypomethylation in HCC tissues. TUBG1 knockdown suppressed the proliferation, invasion, and migration of HCC cells. While TUBG1 expression was positively correlated with CD4 + memory T lymphocyte infiltration, it was negatively correlated with CD4 + regulatory T-cell infiltration in human HCC tissues. Furthermore, TUBG1 expression was positively correlated with the expression of genes involved in cell division. Noticeably, high expression of TUBG1 was associated with poor prognosis in patients with HCC. Overall, our findings revealed that TUBG1 promotes hepatocarcinogenesis by increasing proliferation, invasion, and migration of HCC cells and may regulate T lymphocyte infiltration. The current findings provide important insights into TUBG1 regulation in HCC, which could provide new therapeutic targets for hepatocarcinoma which has a very high incidence and mortality rate worldwide.
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Affiliation(s)
- Zi-Jian Wang
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China.,The First Clinical College, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Zhi-Zheng Dai
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Mei-Zhen Hu
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Jun-Nan Liu
- School of Basic Medicine, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Hang Liang
- School of Basic Medicine, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Mei-Mei Shen
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Shu-Juan Zhu
- School of Basic Medicine, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Hua-Jun Sheng
- School of Basic Medicine, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Jian Gao
- Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Ai-Long Huang
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China
| | - Kai-Fu Tang
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, 400016, People's Republic of China.
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8
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Stuart B, Maund E, Wilcox C, Sridharan K, Sivaramakrishnan G, Regas C, Newell D, Soulsby I, Tang KF, Finlay AY, Bucher HC, Little P, Layton AM, Santer M. Topical preparations for the treatment of mild-to-moderate acne vulgaris: systematic review and network meta-analysis. Br J Dermatol 2021; 185:512-525. [PMID: 33825196 DOI: 10.1111/bjd.20080] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/21/2021] [Indexed: 02/06/2023]
Abstract
BACKGROUND Acne is very common and can have a substantial impact on wellbeing. Guidelines suggest first-line management with topical treatments, but there is little evidence regarding which treatments are most effective. OBJECTIVES To identify the most effective and best tolerated topical treatments for acne using network meta-analysis. METHODS CENTRAL, MEDLINE, Embase and World Health Organization Trials Registry were searched from inception to June 2020 for randomized trials that included participants with mild/moderate acne. Primary outcomes were self-reported improvement in acne, and trial withdrawal. Secondary outcomes included change in lesion counts, Investigator's Global Assessment, change in quality of life and total number of adverse events. Network meta-analysis was undertaken using a frequentist approach. Risk of bias was assessed using the Cochrane Risk of Bias Tool and confidence in evidence was assessed using CINeMA. RESULTS A total of 81 papers were included, reporting 40 trials with a total of 18 089 participants. Patient Global Assessment of Improvement was reported in 11 trials. Based on the pooled network estimates, compared with vehicle, benzoyl peroxide (BPO) was effective (35% vs. 26%) for improving self-reported acne. The combinations of BPO with adapalene (54% vs. 35%) or with clindamycin (49% vs. 35%) were ranked more effective than BPO alone. The withdrawal of participants from the trial was reported in 35 trials. The number of patients withdrawing owing to adverse events was low for all treatments. Rates of withdrawal were slightly higher for BPO with adapalene (2·5%) or clindamycin (2·7%) than BPO (1·6%) or adapalene alone (1·0%). Overall confidence in the evidence was low. CONCLUSIONS Adapalene in combination with BPO may be the most effective treatment for acne but with a slightly higher incidence of withdrawal than monotherapy. Inconsistent reporting of trial results precluded firmer conclusions.
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Affiliation(s)
- B Stuart
- Primary Care, Population Sciences and Medical Education, Faculty of Medicine, University of Southampton, Southampton, UK
| | - E Maund
- Primary Care, Population Sciences and Medical Education, Faculty of Medicine, University of Southampton, Southampton, UK
| | - C Wilcox
- Primary Care, Population Sciences and Medical Education, Faculty of Medicine, University of Southampton, Southampton, UK
| | - K Sridharan
- Department of Pharmacology & Therapeutics, College of Medicine & Medical Sciences, Arabian Gulf University, Manama, Kingdom of Bahrain
| | - G Sivaramakrishnan
- Department of Dental Training, Ministry of Health, Manama, Kingdom of Bahrain
| | - C Regas
- Primary Care, Population Sciences and Medical Education, Faculty of Medicine, University of Southampton, Southampton, UK
| | - D Newell
- Primary Care, Population Sciences and Medical Education, Faculty of Medicine, University of Southampton, Southampton, UK
| | - I Soulsby
- Primary Care, Population Sciences and Medical Education, Faculty of Medicine, University of Southampton, Southampton, UK
| | - K F Tang
- Primary Care, Population Sciences and Medical Education, Faculty of Medicine, University of Southampton, Southampton, UK
| | - A Y Finlay
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff, UK
| | - H C Bucher
- Basel Institute for Clinical Epidemiology and Biostatistics (CEB), University Hospital Basel and University of Basel, Basel, Switzerland
| | - P Little
- Primary Care, Population Sciences and Medical Education, Faculty of Medicine, University of Southampton, Southampton, UK
| | - A M Layton
- Hull York Medical School, York University, Heslington, York, UK.,Harrogate and District NHS Foundation Trust, Harrogate, UK
| | - M Santer
- Primary Care, Population Sciences and Medical Education, Faculty of Medicine, University of Southampton, Southampton, UK
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9
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Zhao Y, Tao F, Jiang J, Chen L, Du J, Cheng X, He Q, Zhong S, Chen W, Wu X, Ou R, Xu Y, Tang KF. Tryptophan 2, 3‑dioxygenase promotes proliferation, migration and invasion of ovarian cancer cells. Mol Med Rep 2021; 23:445. [PMID: 33846800 PMCID: PMC8060793 DOI: 10.3892/mmr.2021.12084] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Accepted: 03/01/2021] [Indexed: 11/24/2022] Open
Abstract
Tryptophan 2,3-dioxygenase (TDO2) is a key rate-limiting enzyme in the kynurenine pathway and promotes tumor growth and escape from immune surveillance in different types of cancer. The present study aimed to investigate whether TDO2 serves a role in the development of ovarian cancer. Reverse transcription-quantitative PCR and western blotting were used to detect the expression of TDO2 in different cell lines. The effects of TDO2 overexpression, TDO2 knockdown and TDO2 inhibitor on ovarian cancer cell proliferation, migration and invasion were determined by MTS, colony formation and Transwell assays. The expression of TDO2 in ovarian cancer tissues, normal ovarian tissues and fallopian tube tissues were analyzed using the gene expression data from The Cancer Genome Atlas and Genotype-Tissue Expression project. Immune cell infiltration in cancer tissues was evaluated using the single sample gene set enrichment analysis algorithm. The present study found that RasV12-mediated oncogenic transformation was accompanied by the upregulation of TDO2. In addition, it was demonstrated that TDO2 was upregulated in ovarian cancer tissues compared with normal ovarian tissues. TDO2 overexpression promoted proliferation, migration and invasion of ovarian cancer cells, whereas TDO2 knockdown repressed these phenotypes. Treatment with LM10, a TDO2 inhibitor, also repressed the proliferation, migration and invasion of ovarian cancer cells. The present study indicated that TDO2 can be used as a new target for the treatment of ovarian cancer.
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Affiliation(s)
- Yuemei Zhao
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Fengxing Tao
- Department of Dermato‑Venereology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Jiayu Jiang
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Lina Chen
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Jizao Du
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Xiaoxiao Cheng
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Qin He
- Department of Medical Ultrasonics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
| | - Shouhui Zhong
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Wei Chen
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Xiaoli Wu
- Department of Gastroenterology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Rongying Ou
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Yunsheng Xu
- Department of Dermato‑Venereology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
| | - Kai-Fu Tang
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325015, P.R. China
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10
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Farooqi AA, Butt G, El-Zahaby SA, Attar R, Sabitaliyevich UY, Jovic JJ, Tang KF, Naureen H, Xu B. Luteolin mediated targeting of protein network and microRNAs in different cancers: Focus on JAK-STAT, NOTCH, mTOR and TRAIL-mediated signaling pathways. Pharmacol Res 2020. [DOI: https://doi.org/10.1016/j.phrs.2020.105188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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11
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Farooqi AA, Butt G, El-Zahaby SA, Attar R, Sabitaliyevich UY, Jovic JJ, Tang KF, Naureen H, Xu B. Luteolin mediated targeting of protein network and microRNAs in different cancers: Focus on JAK-STAT, NOTCH, mTOR and TRAIL-mediated signaling pathways. Pharmacol Res 2020; 160:105188. [PMID: 32919041 DOI: 10.1016/j.phrs.2020.105188] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 08/21/2020] [Accepted: 08/28/2020] [Indexed: 02/07/2023]
Abstract
There has always been a keen interest of basic and clinical researchers to search for cancer therapeutics having minimum off-target effects and maximum anticancer activities. In accordance with this approach, there has been an explosion in the field of natural products research in the past few decades because of extra-ordinary list of natural extracts and their biologically and pharmacologically active constituents having significant medicinal properties. Apparently, luteolin-mediated anticancer effects have been investigated in different cancers but there is superfluousness of superficial data. Generalized scientific evidence encompassing apoptosis, DNA damage and anti-inflammatory effects has been reported extensively. However, how luteolin modulates deregulated oncogenic pathways in different cancers has not been comprehensively uncovered. In this review we have attempted to focus on cutting-edge research which has unveiled remarkable abilities of luteolin to modulate deregulated oncogenic pathways in different cancers. We have partitioned the review into various sections to separately discuss advancements in therapeutic targeting of oncogenic protein networks. We have provided detailed mechanistic insights related to JAK-STAT signaling and summarized how luteolin inhibited STAT proteins to inhibit STAT-driven gene network. We have also individually analyzed Wnt/β-catenin and NOTCH pathway and how luteolin effectively targeted these pathways. Mapping of the signaling landscape has revealed that NOTCH pathway can be targeted therapeutically. NOTCH pathway was noted to be targeted by luteolin. We have also conceptually analyzed how luteolin restored TRAIL-induced apoptosis in resistant cancers. Luteolin induced an increase in pro-apoptotic proteins and efficiently inhibited anti-apoptotic proteins to induce apoptosis. Luteolin mediated regulation of non-coding RNAs is an exciting and emerging facet. Excitingly, there is sequential and systematic accumulation of clues which have started to shed light on intricate regulation of microRNAs by luteolin in different cancers. Collectively, sophisticated information will enable us to develop a refined understanding of the multi-layered regulation of signaling pathways and non-coding RNAs by luteolin in different cancers.
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Affiliation(s)
- Ammad Ahmad Farooqi
- Institute of Biomedical and Genetic Engineering (IBGE), Islamabad, 44000, Pakistan.
| | | | - Sally A El-Zahaby
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy and Drug Manufacturing, Pharos University in Alexandria, Alexandria, Egypt
| | - Rukset Attar
- Department of Obstetrics and Gynecology, Yeditepe University, Turkey
| | - Uteuliyev Yerzhan Sabitaliyevich
- Department of Health Policy and Health Care Development, Kazakh Medical University of Continuing Education, Almaty, 050004, Kazakhstan
| | - Jovana Joksimovic Jovic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, SvetozaraMarkovića 69, 34000, Kragujevac, Serbia
| | - Kai-Fu Tang
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, China
| | - Humaira Naureen
- Faculty of Pharmaceutical Sciences, Riphah International University, Islamabad, Pakistan
| | - Baojun Xu
- Food Science and Technology Program, BNU-HKBU United International College, Zhuhai, 519087, Guangdong, China.
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12
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Wu X, Chen X, Liu H, He ZW, Wang Z, Wei LJ, Wang WY, Zhong S, He Q, Zhang Z, Ou R, Gao J, Lei Y, Yang W, Song G, Jin Y, Zhou L, Xu Y, Tang KF. Rescuing Dicer expression in inflamed colon tissues alleviates colitis and prevents colitis-associated tumorigenesis. Am J Cancer Res 2020; 10:5749-5762. [PMID: 32483416 PMCID: PMC7254990 DOI: 10.7150/thno.41894] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 04/04/2020] [Indexed: 12/13/2022] Open
Abstract
Chronic inflammation is known to promote carcinogenesis; Dicer heterozygous mice are more likely to develop colitis-associated tumors. This study investigates whether Dicer is downregulated in inflamed colon tissues before malignancy occurs and whether increasing Dicer expression in inflamed colon tissues can alleviate colitis and prevent colitis-associated tumorigenesis. Methods: Gene expression in colon tissues was analyzed by immunohistochemistry, immunoblots, and real-time RT-PCR. Hydrogen peroxide or N-acetyl-L-cysteine was used to induce or alleviate oxidative stress, respectively. Mice were given azoxymethane followed by dextran sulfate sodium to induce colitis and colon tumors. Berberine, anastrozole, or pranoprofen was used to rescue Dicer expression in inflammatory colon tissues. Results: Oxidative stress repressed Dicer expression in inflamed colon tissues by inducing miR-215 expression. Decreased Dicer expression increased DNA damage and cytosolic DNA and promoted interleukin-6 expression upon hydrogen peroxide treatment. Dicer overexpression in inflamed colon tissues alleviated inflammation and repressed colitis-associated carcinogenesis. Furthermore, we found that anastrozole, berberine, and pranoprofen could promote Dicer expression and protect cells from hydrogen peroxide-induced DNA damage, thereby reducing cytosolic DNA and partially repressing interleukin-6 expression upon hydrogen peroxide treatment. Rescuing Dicer expression using anastrozole, berberine, or pranoprofen in inflamed colon tissues alleviated colitis and prevented colitis-associated tumorigenesis. Conclusions: Dicer was downregulated in inflamed colon tissues before malignancy occurred. Decreased Dicer expression further exaggerated inflammation, which may promote carcinogenesis. Anastrozole, berberine, and pranoprofen alleviated colitis and colitis-associated tumorigenesis by promoting Dicer expression. Our study provides insight into potential colitis treatment and colitis-associated colon cancer prevention strategies.
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13
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Chen X, Liu M, Lou H, Lu Y, Zhou MT, Ou R, Xu Y, Tang KF. Degradation of endogenous proteins and generation of a null-like phenotype in zebrafish using Trim-Away technology. Genome Biol 2019; 20:19. [PMID: 30674345 PMCID: PMC6343325 DOI: 10.1186/s13059-019-1624-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Accepted: 01/08/2019] [Indexed: 02/05/2023] Open
Abstract
Trim-Away is a recent technique to rapidly deplete a protein from any cell type. Guided by antibodies, TRIM21 selects proteins for destruction. However, the applicability of this method in model organisms has not been investigated. Here, we show that Trim-Away can degrade proteins in zebrafish embryos. Trim-Away depletes proteins faster than morpholinos, which enables analysis of protein function during early embryogenesis. Furthermore, Trim-Away can be applied to evaluate the role of maternally contributed proteins in zebrafish embryos. Our findings indicate that Trim-Away is a powerful tool to perform functional analysis of proteins during zebrafish development.
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Affiliation(s)
- Xiao Chen
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Mi Liu
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Hongyan Lou
- Department of Gynecology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Yiyi Lu
- Department of Dermato-Venereology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Meng-Tao Zhou
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Rongying Ou
- Department of Gynecology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Yunsheng Xu
- Department of Dermato-Venereology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China
| | - Kai-Fu Tang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, People's Republic of China.
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14
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Lu Y, Tao F, Zhou MT, Tang KF. The signaling pathways that mediate the anti-cancer effects of caloric restriction. Pharmacol Res 2019; 141:512-520. [PMID: 30641278 DOI: 10.1016/j.phrs.2019.01.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 12/31/2018] [Accepted: 01/11/2019] [Indexed: 02/07/2023]
Abstract
Caloric restriction (CR) has been shown to promote longevity and ameliorate aging-associated diseases, including cancer. Extensive research over recent decades has revealed that CR reduces IGF-1/PI3K/AKT signaling and increases sirtuin signaling. We recently found that CR also enhances ALDOA/DNA-PK/p53 signaling. In the present review, we summarize the molecular mechanisms underlying the modulation of the IGF-1/PI3K/AKT pathway, sirtuin signaling, and the ALDOA/DNA-PK/p53 pathway by CR. We also summarize the evidence concerning the roles of these signaling pathways in carcinogenesis, and discuss how they are regulated by CR. Finally, we discuss the crosstalk between these signaling pathways.
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Affiliation(s)
- Yiyi Lu
- Department of Dermato-Venereology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, China
| | - Fengxing Tao
- Department of Dermato-Venereology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, China
| | - Meng-Tao Zhou
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, China.
| | - Kai-Fu Tang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, China; Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, China.
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15
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Zhou MT, Zhao C, Chen X, Zhang HC, Li G, Lou H, Huang WJ, Wei LJ, Li DW, Wu X, Zhang ZC, Liu H, Ou R, Yang WJ, Hu S, Xu Y, Tang KF. MicroRNA-34a promotes MICB expression in hepatocytes. Carcinogenesis 2018; 39:1477-1487. [PMID: 30256916 DOI: 10.1093/carcin/bgy128] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 09/21/2018] [Indexed: 01/05/2023] Open
Affiliation(s)
- Meng-Tao Zhou
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Chunming Zhao
- Department of Gastroenterology, The 98th Hospital of PLA, Huzhou, Zhejiang, China
| | - Xiao Chen
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Heng-Chao Zhang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Guiling Li
- Institute of Genomic Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Hongyan Lou
- Department of Gynaecology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Wen-Jie Huang
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Lin-Jie Wei
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - De-Wei Li
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Xiaoli Wu
- Department of Gastroenterology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Zhe-Chao Zhang
- Department of Gynaecology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Hui Liu
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Rongying Ou
- Department of Gynaecology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Wen-Jun Yang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Shanshan Hu
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Yunsheng Xu
- Department of Dermato-Venereology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Kai-Fu Tang
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
- Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
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16
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Chen X, Li WF, Wu X, Zhang HC, Chen L, Zhang PY, Liu LY, Ma D, Chen T, Zhou L, Xu Y, Zhou MT, Tang KF. Dicer regulates non-homologous end joining and is associated with chemosensitivity in colon cancer patients. Carcinogenesis 2017; 38:873-882. [PMID: 28911000 DOI: 10.1093/carcin/bgx059] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 06/24/2017] [Indexed: 11/14/2022] Open
Abstract
DNA double-strand break (DSB) repair is an important mechanism underlying chemotherapy resistance in human cancers. Dicer participates in DSB repair by facilitating homologous recombination. However, whether Dicer is involved in non-homologous end joining (NHEJ) remains unknown. Here, we addressed whether Dicer regulates NHEJ and chemosensitivity in colon cancer cells. Using our recently developed NHEJ assay, we found that DSB introduction by I-SceI cleavage leads to Dicer upregulation. Dicer knockdown increased SIRT7 binding and decreased the level of H3K18Ac (acetylated lysine 18 of histone H3) at DSB sites, thereby repressing the recruitment of NHEJ factors to DSB sites and inhibiting NHEJ. Dicer overexpression reduced SIRT7 binding and increased the level of H3K18Ac at DSB sites, promoting the recruitment of NHEJ factors to DSBs and moderately enhancing NHEJ. Dicer knockdown and overexpression increased and decreased, respectively, the chemosensitivity of colon cancer cells. Dicer protein expression in colon cancer tissues of patients was directly correlated with chemoresistance. Our findings revealed a function of Dicer in NHEJ-mediated DSB repair and the association of Dicer expression with chemoresistance in colon cancer patients.
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Affiliation(s)
- Xiao Chen
- Institute of Translational Medicine.,Digestive Cancer Center.,Department of Gastroenterology
| | | | | | - Heng-Chao Zhang
- Institute of Translational Medicine.,Digestive Cancer Center.,Department of Gastroenterology
| | - Li Chen
- Institute of Translational Medicine.,Digestive Cancer Center.,Department of Gastroenterology
| | - Pei-Ying Zhang
- Institute of Translational Medicine.,Digestive Cancer Center.,Department of Gastroenterology
| | - Li-Yuan Liu
- Department of Infection and Liver Diseases, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Di Ma
- Institute of Translational Medicine.,Digestive Cancer Center.,Department of Gastroenterology
| | - Tongke Chen
- Laboratory Animal Centre, Wenzhou Medical University, Ouhai District, Wenzhou 325035, Zhejiang, P.R. China
| | - Lingli Zhou
- Department of Pathology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | | | - Meng-Tao Zhou
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang, P.R. China
| | - Kai-Fu Tang
- Institute of Translational Medicine.,Digestive Cancer Center.,Department of Gastroenterology
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17
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Zhang HC, Tang KF. Clinical value of integrated-signature miRNAs in esophageal cancer. Cancer Med 2017; 6:1893-1903. [PMID: 28707457 PMCID: PMC5548877 DOI: 10.1002/cam4.1129] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 05/13/2017] [Accepted: 05/17/2017] [Indexed: 12/19/2022] Open
Abstract
MicroRNAs (miRNAs) are crucial regulators of gene expression in tumorigenesis and are of great interest to researchers, but miRNA profiles are often inconsistent between studies. The aim of this study was to confirm candidate miRNA biomarkers for esophageal cancer from integrated‐miRNA expression profiling data and TCGA (The Cancer Genome Atlas) data in tissues. Here, we identify five significant miRNAs by a comprehensive analysis in esophageal cancer, and two of them (hsa‐miR‐100‐5p and hsa‐miR‐133b) show better prognoses with significant difference for both 3‐year and 5‐year survival. Additionally, they participate in esophageal cancer occurrence and development according to KEGG and Panther enrichment analyses. Therefore, these five miRNAs may serve as miRNA biomarkers in esophageal cancer. Analysis of differential expression for target genes of these miRNAs may also provide new therapeutic alternatives in esophageal cancer.
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Affiliation(s)
- Heng-Chao Zhang
- Institute of Translational Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, China.,Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, China
| | - Kai-Fu Tang
- Institute of Translational Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, China.,Digestive Cancer Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, Zhejiang, China
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Jin X, Jeon HM, Jin X, Kim EJ, Yin J, Jeon HY, Sohn YW, Oh SY, Kim JK, Kim SH, Jung JE, Kwak S, Tang KF, Xu Y, Rich JN, Kim H. The ID1-CULLIN3 Axis Regulates Intracellular SHH and WNT Signaling in Glioblastoma Stem Cells. Cell Rep 2016; 16:1629-1641. [PMID: 27477274 DOI: 10.1016/j.celrep.2016.06.092] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Revised: 03/25/2016] [Accepted: 06/27/2016] [Indexed: 11/16/2022] Open
Abstract
Inhibitor of differentiation 1 (ID1) is highly expressed in glioblastoma stem cells (GSCs). However, the regulatory mechanism responsible for its role in GSCs is poorly understood. Here, we report that ID1 activates GSC proliferation, self-renewal, and tumorigenicity by suppressing CULLIN3 ubiquitin ligase. ID1 induces cell proliferation through increase of CYCLIN E, a target molecule of CULLIN3. ID1 overexpression or CULLIN3 knockdown confers GSC features and tumorigenicity to murine Ink4a/Arf-deficient astrocytes. Proteomics analysis revealed that CULLIN3 interacts with GLI2 and DVL2 and induces their degradation via ubiquitination. Consistent with ID1 knockdown or CULLIN3 overexpression in human GSCs, pharmacologically combined control of GLI2 and β-CATENIN effectively diminishes GSC properties. A ID1-high/CULLIN3-low expression signature correlates with a poor patient prognosis, supporting the clinical relevance of this signaling axis. Taken together, a loss of CULLIN3 represents a common signaling node for controlling the activity of intracellular WNT and SHH signaling pathways mediated by ID1.
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Affiliation(s)
- Xun Jin
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea; Department of Stem Cell Biology and Regenerative Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA; First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China; Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
| | - Hye-Min Jeon
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Xiong Jin
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Eun-Jung Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Jinlong Yin
- Specific Organs Cancer Division, Research Institute and Hospital, National Cancer Center, Goyang 10408, Republic of Korea
| | - Hee-Young Jeon
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Young-Woo Sohn
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Se-Yeong Oh
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Jun-Kyum Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Sung-Hak Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea; Department of Neurosurgery, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Ji-Eun Jung
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea; Specific Organs Cancer Division, Research Institute and Hospital, National Cancer Center, Goyang 10408, Republic of Korea
| | - Sungwook Kwak
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Kai-Fu Tang
- First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Yunsheng Xu
- First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Jeremy N Rich
- Department of Stem Cell Biology and Regenerative Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Hyunggee Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea.
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Zhang PY, Li G, Deng ZJ, Liu LY, Chen L, Tang JZ, Wang YQ, Cao ST, Fang YX, Wen F, Xu Y, Chen X, Shi KQ, Li WF, Xie C, Tang KF. Dicer interacts with SIRT7 and regulates H3K18 deacetylation in response to DNA damaging agents. Nucleic Acids Res 2015; 44:3629-42. [PMID: 26704979 PMCID: PMC4856966 DOI: 10.1093/nar/gkv1504] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 12/10/2015] [Indexed: 01/14/2023] Open
Abstract
Dicer participates in heterochromatin formation in fission yeast and plants. However, whether it has a similar role in mammals remains controversial. Here we showed that the human Dicer protein interacts with SIRT7, an NAD+-dependent H3K18Ac (acetylated lysine 18 of histone H3) deacetylase, and holds a proportion of SIRT7 in the cytoplasm. Dicer knockdown led to an increase of chromatin-associated SIRT7 and simultaneously a decrease of cytoplasmic SIRT7, while its overexpression induced SIRT7 reduction in the chromatin-associated fraction and increment in the cytoplasm. Furthermore, DNA damaging agents promoted Dicer expression, leading to decreased level of chromatin-associated SIRT7 and increased level of H3K18Ac, which can be alleviated by Dicer knockdown. Taken together with that H3K18Ac was exclusively associated with the chromatin, our findings suggest that Dicer induction by DNA damaging treatments prevents H3K18Ac deacetylation, probably by trapping more SIRT7 in the cytoplasm.
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Affiliation(s)
- Pei-Ying Zhang
- Institute of Translational Medicine, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China Cancer Center, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Guiling Li
- Institute of Genomic Medicine, Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Zhu-Jun Deng
- Institute of Translational Medicine, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China Cancer Center, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Li-Yuan Liu
- Department of Infection and Liver Diseases, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Li Chen
- Institute of Translational Medicine, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China Cancer Center, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Jun-Zhou Tang
- Research Institute of Surgery, Daping Hospital, Third Military Medical University, Chongqing 400042, P.R. China
| | - Yu-Qun Wang
- Department of Infection and Liver Diseases, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Su-Ting Cao
- Department of Infection and Liver Diseases, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Yu-Xiao Fang
- Institute of Translational Medicine, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China Cancer Center, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Fuping Wen
- Institute of Translational Medicine, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Yunsheng Xu
- Institute of Translational Medicine, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China Department of Dermato-Venereology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Xiaoming Chen
- Institute of Translational Medicine, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China Department of Pediatric Surgery, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Ke-Qing Shi
- Department of Infection and Liver Diseases, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Wen-Feng Li
- Department of Radiation Oncology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Congying Xie
- Department of Radiation Oncology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
| | - Kai-Fu Tang
- Institute of Translational Medicine, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China Cancer Center, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China Institute of Genomic Medicine, Wenzhou Medical University, Wenzhou 325015, Zhejiang, P.R. China
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Lin Z, Chen L, Song M, Shi KQ, Tang KF. Association between a polymorphism in miR-34b/c and susceptibility to cancer--a meta-analysis. Asian Pac J Cancer Prev 2015; 15:7251-5. [PMID: 25227823 DOI: 10.7314/apjcp.2014.15.17.7251] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
MicroRNAs (miRNAs) act as tumor suppressors or promoters in neoplasia by regulating relative gene expression. The association between a single nucleotide polymorphism (SNP) rs4938723 in miR-34b/c and susceptibility to cancers was inconsistent in previous studies. In this study, we conducted a literature search of PubMed, Web of Science and Embase to identify all relevant studies in this meta-analysis with 6,036 cases and 6,204 controls. We found that the miR-34b/c rs4938723 polymorphism was significantly associated with increased risk of cancers in the heterozygous model (TC versus TT, OR=1.09, 95% CI=1.01-1.18, P=0.02). Subgroup analysis also revealed increased risk for Asian ethnicity in the heterozygous model (TC versus TT, OR=1.12, 95% CI=1.02-1.22, P=0.02), but decreased risk of colorectal cancer in homozygote model (CC versus TT, OR=0.66, 95% CI=0.47-0.92, P=0.02) and in the recessive model (CC versus TC+TT, OR=0.67, 95% CI=0.48-0.93, P=0.02) by cancer type. The current meta-analysis indicated that the miR-34b/c rs4938723 polymorphism may decrease susceptibility to colorectal cancer. Well-designed studies with larger sample size are required to further validate the results.
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Affiliation(s)
- Zhuo Lin
- Department of Infection and Liver Diseases, Institution of Hepatology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China E-mail :
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Wang YQ, Ren YF, Song YJ, Xue YF, Zhang XJ, Cao ST, Deng ZJ, Wu J, Chen L, Li G, Shi KQ, Chen YP, Ren H, Huang AL, Tang KF. MicroRNA-581 promotes hepatitis B virus surface antigen expression by targeting Dicer and EDEM1. Carcinogenesis 2014; 35:2127-2133. [DOI: 10.1093/carcin/bgu128] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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Shi KQ, Tang JZ, Zhu XL, Ying L, Li DW, Gao J, Fang YX, Li GL, Song YJ, Deng ZJ, Wu JM, Tang KF. Controlled attenuation parameter for the detection of steatosis severity in chronic liver disease: a meta-analysis of diagnostic accuracy. J Gastroenterol Hepatol 2014; 29:1149-58. [PMID: 24476011 DOI: 10.1111/jgh.12519] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/12/2014] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND AIM Controlled attenuation parameter (CAP) is a novel ultrasound-based elastography method for detection of steatosis severity. This meta-analysis aimed to assess the performance of CAP. METHODS PubMed, the Cochrane Library, and the Web of Knowledge were searched to find studies, published in English, relating to accuracy evaluations of CAP for detecting stage 1 (S1), stage 2 (S2), or stage 3 (S3) hepatic steatosis which was diagnosed by liver biopsy. Sensitivities, specificities, and hierarchical summary receiver operating characteristic (HSROC) curves were used to examine CAP performance. The clinical utility of CAP was also evaluated. RESULTS Nine studies, with 11 cohorts were analyzed. The summary sensitivities and specificities values were 0.78 (95% confidence interval [CI], 0.69-0.84) and 0.79 (95% CI, 0.68-0.86) for ≥ S1, 0.85 (95% CI, 0.74-0.92) and 0.79 (95% CI, 0.71-0.85) for ≥ S2, and 0.83 (95% CI, 0.76-0.89) and 0.79 (95% CI, 0.68-0.87) for ≥ S3. The HSROCs were 0.85 (95% CI, 0.81-88) for ≥ S1, 0.88 (95% CI, 0.85-0.91) for ≥ S2, and 0.87 (95% CI, 0.84-0.90) for ≥ S3. Following a "positive" measurement (over the threshold value) for ≥ S1, ≥ S2, and ≥ S3, the corresponding post-test probabilities for the presence of steatosis (pretest probability was 50%) were 78%, 80% and 80%, respectively; if the values were below these thresholds ("negative" results), the post-test probabilities were 22%, 16%, and 17%, respectively. CONCLUSIONS CAP has good sensitivity and specificity for detecting hepatic steatosis; however, based on a meta-analysis, CAP was limited in their accuracy of steatosis, which precluded widespread use in clinical practice.
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Affiliation(s)
- Ke-Qing Shi
- Department of Infection and Liver Diseases, Institution of Hepatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
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Wang Y, Li G, Mao F, Li X, Liu Q, Chen L, Lv L, Wang X, Wu J, Dai W, Wang G, Zhao E, Tang KF, Sun ZS. Ras-induced epigenetic inactivation of the RRAD (Ras-related associated with diabetes) gene promotes glucose uptake in a human ovarian cancer model. J Biol Chem 2014; 289:14225-38. [PMID: 24648519 DOI: 10.1074/jbc.m113.527671] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
RRAD (Ras-related associated with diabetes) is a small Ras-related GTPase that is frequently inactivated by DNA methylation of the CpG island in its promoter region in cancer tissues. However, the role of the methylation-induced RRAD inactivation in tumorigenesis remains unclear. In this study, the Ras-regulated transcriptome and epigenome were profiled by comparing T29H (a Ras(V12)-transformed human ovarian epithelial cell line) with T29 (an immortalized but non-transformed cell line) through reduced representation bisulfite sequencing and digital gene expression. We found that Ras(V12)-mediated oncogenic transformation was accompanied by RRAD promoter hypermethylation and a concomitant loss of RRAD expression. In addition, we found that the RRAD promoter was hypermethylated, and its transcription was reduced in ovarian cancer versus normal ovarian tissues. Treatment with the DNA methyltransferase inhibitor 5-aza-2'-deoxycytidine resulted in demethylation in the RRAD promoter and restored RRAD expression in T29H cells. Additionally, treatment with farnesyltransferase inhibitor FTI277 resulted in restored RRAD expression and inhibited DNA methytransferase expression and activity in T29H cells. By employing knockdown and overexpression techniques in T29 and T29H, respectively, we found that RRAD inhibited glucose uptake and lactate production by repressing the expression of glucose transporters. Finally, RRAD overexpression in T29H cells inhibited tumor formation in nude mice, suggesting that RRAD is a tumor suppressor gene. Our results indicate that Ras(V12)-mediated oncogenic transformation induces RRAD epigenetic inactivation, which in turn promotes glucose uptake and may contribute to ovarian cancer tumorigenesis.
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Affiliation(s)
- Yan Wang
- From the Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China, the University of the Chinese Academy of Sciences, Beijing 100080, China
| | - Guiling Li
- the Institute of Genomic Medicine, Wenzhou Medical University, 268 West Xueyuan Road, Wenzhou, Zhejiang Province 325000, China
| | - Fengbiao Mao
- the University of the Chinese Academy of Sciences, Beijing 100080, China, the Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing 100101, China
| | - Xianfeng Li
- the State Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan Province 410078, China, and
| | - Qi Liu
- the Institute of Genomic Medicine, Wenzhou Medical University, 268 West Xueyuan Road, Wenzhou, Zhejiang Province 325000, China
| | - Lin Chen
- the Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing 100101, China
| | - Lu Lv
- the Institute of Genomic Medicine, Wenzhou Medical University, 268 West Xueyuan Road, Wenzhou, Zhejiang Province 325000, China
| | - Xin Wang
- the Institute of Genomic Medicine, Wenzhou Medical University, 268 West Xueyuan Road, Wenzhou, Zhejiang Province 325000, China
| | - Jinyu Wu
- the Institute of Genomic Medicine, Wenzhou Medical University, 268 West Xueyuan Road, Wenzhou, Zhejiang Province 325000, China
| | - Wei Dai
- From the Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China
| | - Guan Wang
- the Department of Obstetrics and Gynecology, General Hospital of Chinese People's Liberation Army, Beijing 100853, China
| | - Enfeng Zhao
- the Department of Obstetrics and Gynecology, General Hospital of Chinese People's Liberation Army, Beijing 100853, China
| | - Kai-Fu Tang
- the Institute of Genomic Medicine, Wenzhou Medical University, 268 West Xueyuan Road, Wenzhou, Zhejiang Province 325000, China,
| | - Zhong Sheng Sun
- the Institute of Genomic Medicine, Wenzhou Medical University, 268 West Xueyuan Road, Wenzhou, Zhejiang Province 325000, China, the Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing 100101, China,
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Deng ZJ, Shi KQ, Song YJ, Fang YX, Wu J, Li G, Tang KF, Qu J. Association between a lumican promoter polymorphism and high myopia in the Chinese population: a meta-analysis of case-control studies. Ophthalmologica 2014; 232:110-7. [PMID: 24516061 DOI: 10.1159/000356698] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 09/30/2013] [Indexed: 11/19/2022]
Abstract
PURPOSE To evaluate the relationship between lumican polymorphisms and high myopia in Chinese populations. METHODS An electronic search was conducted in Pubmed, Embase, Cochrane Library and the China Biological Medicine Database for articles published prior to September 30, 2012. A meta-analysis was performed to assess heterogeneity, combine results and determine publication bias. RESULTS This meta-analysis, including 1,545 subjects from 5 studies, indicated that Chinese lumican rs3759223 C allele carriers had a decreased risk of high myopia in comparison to T allele carriers (odds ratio: 0.531; 95% confidence interval, CI: 0.304-0.925; p = 0.025). There was some heterogeneity between studies. A metaregression showed that the mean axial length of controls weakens the effect of rs3759223 on high myopia (slope: -0.914; 95% CI: -1.490 to 0.337; p = 0.002). Sensitivity analysis confirmed the reliability and stability of this meta-analysis. CONCLUSION Chinese lumican rs3759223 C allele carriers may be at reduced risk of high myopia.
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Affiliation(s)
- Zhu-Jun Deng
- School of Optometry and Ophthalmology and Eye Hospital, Wenzhou Medical University, Wenzhou, PR China
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Ying L, Lin X, Xie ZL, Hu YP, Tang KF, Shi KQ. Clinical utility of endoscopic ultrasound elastography for identification of malignant pancreatic masses: a meta-analysis. J Gastroenterol Hepatol 2013; 28:1434-43. [PMID: 23731128 DOI: 10.1111/jgh.12292] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/16/2013] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND AIM Endoscopic ultrasound (EUS) elastography is not used for detection but rather for characterization of solid pancreatic masses. A meta-analysis was used to assess the accuracy of EUS elastography for identification of malignant pancreatic masses. METHODS PubMed, the Cochrane Library, and the ISI Web of Knowledge were searched. The studies relating to evaluation accuracy of qualitative or quantitative EUS elastography for identification of malignant pancreatic masses were collected. Language was limited to English. The sensitivity and specificity were used to examine the accuracy. Clinical utility was evaluated by likelihood ratio scattergram. RESULTS A total of 10 studies including 893 pancreatic masses (646 malignant, 72.3%) were analyzed. The summary sensitivity and specificity for the diagnosis of malignant pancreatic masses were 0.98 (95% confidence interval [CI] 0.93-1.00) and 0.69 (95% CI 0.52-0.82) for qualitative EUS elastography, and 0.96 (95% CI 0.86-0.99) and 0.76 (95% CI 0.58-0.87) for quantitative EUS elastography, respectively. The hierarchical summary receiver operating characteristic curves were 0.94 and 0.93 for qualitative and quantitative EUS elastography. The accuracy of quantitative methods was similar to qualitative methods. The positive and negative likelihood ratios were 3.15 and 0.03 for qualitative EUS elastography, and 3.94 and 0.05 for quantitative EUS elastography, respectively. Both qualitative and quantitative methods were useful for exclusion of presence of malignant pancreatic masses and not for its confirmation. CONCLUSIONS EUS elastography could be used as a good identification tool for benign and malignant pancreatic masses, with its good performance for exclusion of presence of malignant pancreatic masses.
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Affiliation(s)
- Li Ying
- Department of Ultrasonography, Institution of Hepatology, The First Affiliated Hospital of Wenzhou Medical College, Wenzhou, China
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Wu J, Zhang XJ, Shi KQ, Chen YP, Ren YF, Song YJ, Li G, Xue YF, Fang YX, Deng ZJ, Xu X, Gao J, Tang KF. Hepatitis B surface antigen inhibits MICA and MICB expression via induction of cellular miRNAs in hepatocellular carcinoma cells. Carcinogenesis 2013; 35:155-63. [PMID: 23917076 DOI: 10.1093/carcin/bgt268] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Hepatitis B surface antigen (HBsAg) seropositivity is an important risk factor for hepatocellular carcinoma (HCC), and HBsAg-transgenic mice have been reported to spontaneously develop HCC. The major histocompatibility complex class I-related molecules A and B (MICA and MICB) are NKG2D ligands that play important roles in tumor immune surveillance. In the present study, we found that HBsAg overexpression in HepG2 cells led to upregulation of 133 and downregulation of 9 microRNAs (miRNAs). Interestingly, several HBsAg-induced miRNAs repressed the expression of MICA and MICB via targeting their 3'-untranslated regions. In addition, the expression of MICA and MICB was significantly reduced upon HBsAg overexpression, which was partially restored by inhibiting the activities of HBsAg-induced miRNAs. Moreover, HBsAg-overexpressing HCC cells exhibited reduced sensitivity to natural killer cell-mediated cytolysis. Taken together, our data suggest that HBsAg supresses the expression of MICA and MICB via induction of cellular miRNAs, thereby preventing NKG2D-mediated elimination of HCC cells.
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Affiliation(s)
- Jianmin Wu
- Institute of Genomic Medicine, Wenzhou Medical College, 268 Xueyuan Road, Wenzhou, Zhejiang Province 325000, P.R. China
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Shi KQ, Lin Z, Li DW, Fang YX, Gao J, Deng ZJ, Chen L, Li GL, Wu JM, Tang KF. Meta-Analysis of the Association between a Polymorphism in MicroRNA-196a2 and Susceptibility to Colorectal Cancer. ACTA ACUST UNITED AC 2013; 36:560-5. [DOI: 10.1159/000355158] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Abstract
Dicer is the key component of the RNA interference pathway. Our group and others have reported that knockdown or knockout of Dicer leads to DNA damage in mammalian cells. Two groups recently showed that efficiency of DNA damage repair was greatly reduced in Dicer-deficient cells and that Dicer-dependent small RNAs (~21 nucleotides) produced from the sequences in the vicinity of DNA double-strand break sites were essential for DNA damage repair. Moreover, accumulating data have suggested that miroRNAs play pivotal roles in DNA damage repair. In this review, we discuss the molecular mechanisms by which loss of Dicer leads to DNA damage, as well as the role of Dicer in tumorigenesis.
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Affiliation(s)
- Kai-Fu Tang
- Authors to whom correspondence should be addressed; E-Mails: (K.-F.T.); (H.R.); Tel.: +86-577-8883-1271 (K.-F.T.); +86-236-369-3029 (H.R.); Fax: +86-577-8883-1359 (K.-F.T.); +86-236-370-3790 (H.R.)
| | - Hong Ren
- Authors to whom correspondence should be addressed; E-Mails: (K.-F.T.); (H.R.); Tel.: +86-577-8883-1271 (K.-F.T.); +86-236-369-3029 (H.R.); Fax: +86-577-8883-1359 (K.-F.T.); +86-236-370-3790 (H.R.)
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Ren YF, Li G, Wu J, Xue YF, Song YJ, Lv L, Zhang XJ, Tang KF. Dicer-dependent biogenesis of small RNAs derived from 7SL RNA. PLoS One 2012; 7:e40705. [PMID: 22808238 PMCID: PMC3395682 DOI: 10.1371/journal.pone.0040705] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Accepted: 06/12/2012] [Indexed: 01/07/2023] Open
Abstract
It has been reported that decreased Dicer expression leads to Alu RNAs accumulation in human retinal pigmented epithelium cells, and Dicer may process the endogenous SINE/B1 RNAs (the rodent equivalent of the primate Alu RNAs) into small interfering RNAs (siRNAs). In this study, we aimed to address whether Dicer can process Alu RNAs and their common ancestor, 7SL RNA. Using Solexa sequencing technology, we showed that Alu-derived small RNAs accounted for 0.6% of the total cellular small RNAs in HepG2.2.15 cells, and the abundance decreased when Dicer was knocked down. However, Alu-derived small RNAs showed different characteristics from miRNAs and siRNAs, the classic Dicer-processed products. Interestingly, we found that small RNAs derived from 7SL RNA accounted for 3.1% of the total cellular small RNAs in the control cells, and the abundance dropped about 3.4 folds in Dicer knockdown cells. Dicer-dependent biogenesis of 7SL RNA-derived small RNAs was validated by northern blotting. In vitro cleavage assay using the recombinant human Dicer protein also showed that synthetic 7SL RNA was processed by Dicer into fragments of different lengths. Further functional analysis suggested that 7SL RNA-derived small RNAs do not function like miRNAs, neither do they regulate the expression of 7SL RNA. In conclusion, the current study demonstrated that Dicer can process 7SL RNA, however, the biological significance remains to be elucidated.
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Affiliation(s)
- Yong-Feng Ren
- Institute of Genomic Medicine, Wenzhou Medical College, Wenzhou, People's Republic of China
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Wu J, Wu G, Lv L, Ren YF, Zhang XJ, Xue YF, Li G, Lu X, Sun Z, Tang KF. MicroRNA-34a inhibits migration and invasion of colon cancer cells via targeting to Fra-1. Carcinogenesis 2011; 33:519-28. [PMID: 22198213 DOI: 10.1093/carcin/bgr304] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
MicroRNA-34a (miR-34a), a transcriptional target of p53, is a well-known tumor suppressor gene. Here, we identified Fra-1 as a new target of miR-34a and demonstrated that miR-34a inhibits Fra-1 expression at both protein and messenger RNA levels. In addition, we found that p53 indirectly regulates Fra-1 expression via a miR-34a-dependant manner in colon cancer cells. Overexpression of miR-34a strongly inhibited colon cancer cell migration and invasion, which can be partially rescued by forced expression of the Fra-1 transcript lacking the 3'-untranslated region. The expression of matrix metalloproteinase (MMP)-1 and MMP-9, two enzymes involved in cell migration and invasion, was decreased in miR-34a-transfected cells, and this can be rescued by Fra-1 overexpression. Moreover, we found that miR-34a was downregulated in 25 of 40 (62.5%) colon cancer tissues, as compared with the adjacent normal colon tissues and that the expression of miR-34a was correlated with the DNA-binding activity of p53. Unexpectedly, the DNA-binding activity of p53 was not inversely correlated with Fra-1 expression, and a significant statistical inverse correlation between miR-34a and Fra-1 expression was only observed in 14 of 40 (35%) colon cancer tissues. Taken together, our in vitro data suggest that p53 regulates Fra-1 expression, and eventually cell migration/invasion, via a miR-34a-dependent manner. However, in vivo data indicate that the p53-miR-34a pathway is not the major regulator of Fra-1 expression in human colon cancer tissues.
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Affiliation(s)
- Jianmin Wu
- Institute of Genomic Medicine, Wenzhou Medical College, 268 Xueyuan Road, Wenzhou, Zhejiang 325000, People's Republic of China
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Wu JF, Shen W, Liu NZ, Zeng GL, Yang M, Zuo GQ, Gan XN, Ren H, Tang KF. Down-regulation of Dicer in hepatocellular carcinoma. Med Oncol 2010; 28:804-9. [PMID: 20405249 DOI: 10.1007/s12032-010-9520-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Accepted: 03/26/2010] [Indexed: 01/04/2023]
Abstract
Dicer, the key enzyme in the RNAi pathway, is misregulated in tumor tissues. The altered expression of Dicer is associated with clinical characteristics in patients with cancer. Liver carcinoma and adjacent non-neoplastic tissues were obtained from 36 patients with hepatocellular carcinoma (HCC) undergoing surgery. Expressions of Dicer mRNA were evaluated using the Real-time reverse transcription-PCR in 36 liver carcinoma tissues and 36 adjacent histologically non-cancerous liver tissues. Dicer mRNA levels were evaluated in relation to age, sex, tumor number, tumor size, tumor stage, and distant metastasis. Dicer mRNA level was significantly lower in malignant tissues than in the corresponding non-neoplastic tissues in 34 of the 36 patients with HCC (94.4%). The Dicer expression level was not associated with clinical characteristics, including age, sex, tumor number, tumor size, tumor stage, or distant metastasis in HCC cases. These results demonstrate that Dicer is significantly down-regulated in HCC, suggesting that reduced expression of Dicer may play an important role during the process of hepatocarcinogenesis.
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Affiliation(s)
- Jin-Feng Wu
- Key Laboratory of Molecular Biology for Infectious Diseases of the State Ministry of Education, Institute for Viral Hepatitis, The Second Affiliated Hospital, Chongqing Medical University, 74# Linjiang Road, 400010, Chongqing, People's Republic of China
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32
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Tang KF, Song GB, Shi YS, Yuan L, Li YH. Dicer knockdown induces fibronectin-1 expression in HEK293T cells via induction of Egr1. Biochim Biophys Acta Gen Subj 2009; 1800:380-4. [PMID: 19914350 DOI: 10.1016/j.bbagen.2009.11.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 11/04/2009] [Accepted: 11/06/2009] [Indexed: 10/20/2022]
Abstract
BACKGROUND Dicer is a multidomain ribonuclease III enzyme involved in the biogenesis of microRNAs (miRNAs) and small interfering RNAs (siRNAs); depletion of Dicer was found to impair the migration of endothelial cells. METHODS siRNA transfection, cell migration assay, real-time RT-PCR, chromatin immunoprecipitation, Western blotting, ELISA, caspase-3 activity assay, and annexin-V-FITC assay were utilized. RESULTS Knockdown of Dicer impairs the migratory capacity of HEK293T cells and induces fibronectin-1. The upregulation of fibronectin-1 is dependent on Egr1. Fibronectin-1/Dicer double-knockdown cells showed a marked increase in apoptosis compared with fibronectin-1 single knockdown cells. CONCLUSIONS Decreased Dicer expression induces fibronectin-1 expression via an Egr1-dependent manner. GENERAL SIGNIFICANCE Our data suggest that upregulation of fibronectin-1 protects Dicer knockdown HEK293T cells against apoptosis.
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Affiliation(s)
- Kai-Fu Tang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, PR China
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Hu P, Hu HD, Chen M, Peng ML, Tang L, Tang KF, Matsui M, Belladonna ML, Yoshimoto T, Zhang DZ, Xiang R, Ren H. Expression of interleukins-23 and 27 leads to successful gene therapy of hepatocellular carcinoma. Mol Immunol 2009; 46:1654-62. [PMID: 19299021 DOI: 10.1016/j.molimm.2009.02.025] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2007] [Revised: 02/11/2009] [Accepted: 02/14/2009] [Indexed: 10/21/2022]
Abstract
IL-23 and IL-27 are two novel IL-12 cytokine family members who are quite similar to, but yet clearly distinct from IL-12 in their structures and T-cell stimulatory mechanisms. Here, we demonstrated that either IL-27 or IL-23 has potent antitumor activity in murine models of MM45T.Li hepatocellular carcinoma (HCC). These potent antitumor effects were induced primarily by CD8(+)T cells, secreting IFN-gamma while CD4(+)T cells were also involved as a help of antitumor immunity. However, the antitumor response induced by IL-27 was observed from an early stage of tumor growth whereas that of IL-23 was only evident in the late stage of tumor cell proliferation. IL-23 could induce mice to develop a long-term systemic immunologic memory response against parental MM45T.Li tumors cells, an effect IL-27 was not able to accomplish. CTLs specific for MM45T.Li cells were significantly induced by IL-23, whereas antitumor efficacy mediated by IL-27 and IL-12 involved NK cells, which IL-23 failed to activate. Furthermore, we demonstrated that CD40 expression also plays an important role in the induction of antitumor activities by IL-27, IL-23 or IL-12. Together our data suggest that IL-27 and IL-23 may be two novel and attractive candidate agents to apply to cancer immunotherapy.
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Affiliation(s)
- Peng Hu
- Institute for Viral Hepatitis, Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Department of Infectious Diseases, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
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Hu P, Peng ML, Chen M, Hu HD, Tang L, Tang KF, Ren H. Molecular cloning, expression and characterization of an interleukin 27 p28 homolog in pig (Sus scrofa). Vet Immunol Immunopathol 2009; 130:262-7. [PMID: 19269039 DOI: 10.1016/j.vetimm.2009.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2007] [Revised: 01/19/2009] [Accepted: 02/06/2009] [Indexed: 11/25/2022]
Abstract
IL-27 is the newest member of the IL-12 cytokine family and plays an important role in the immune regulation. It is composed of two subunits, p28 and EBV-induced gene 3(EBI3). Although human and mouse IL-27 p28 genes have been cloned, pig IL-27 p28 gene has not ever been reported. In the present study, we have cloned and characterized the full-length cDNA of IL-27 p28 from pig. The open reading frame of pig IL-27 p28 gene is 720 bp, which encodes a protein of 239 amino acids with a predicted molecular mass of 26.6 kDa. The deduced amino acid sequence of pig IL-27 p28 showed a high degree of homology to human (63%) and mouse (58%). It was a 4-helix cytokine and belonged to 4-helix cytokine superfamily. Pig IL-27 p28 has one transmembrane region, one signal peptide, and one N-glycosylation site, two Protein kinase C phosphorylation sites, three Casein kinase II phosphorylation sites and one N-myristoylation site. For the expression of pig IL-27 p28 protein in a eukaryotic expression system the recombinant plasmid was constructed. The expression of pig IL-27 p28 in mammalian cells were confirmed by flow cytometry analysis, immunofluorescence and Western blot. The analysis also confirmed a cross reactivity with anti-mouse IL-27 p28 antibody. This is the first report of cloning and characterization of IL-27 p28 in pig.
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Affiliation(s)
- Peng Hu
- Institute for Viral Hepatitis, Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, The Second Affiliated Hospital, Chongqing Medical University, 74# Linjiang Road, Chongqing, China.
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Tang KF, Chen M, Xie J, Song GB, Shi YS, Liu Q, Mei ZC, Steinle A, Ren H. Inhibition of hepatitis B virus replication by small interference RNA induces expression of MICA in HepG2.2.15 cells. Med Microbiol Immunol 2008; 198:27-32. [PMID: 18685862 DOI: 10.1007/s00430-008-0101-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2007] [Indexed: 01/25/2023]
Abstract
Hepatitis B virus (HBV) replicates in most tumor tissues of patients with HBV-associated hepatocellular carcinoma (HCC). In the present study, we have shown that the expression of HBV in the HCC cell lines, HepG2 and Huh7, down-regulated the expression of MHC class I-related molecule A (MICA), a ligand of the NKG2D receptor. Inhibition of HBV expression by small interference RNAs (siRNAs) in HepG2.2.15, a cell line that constitutively expresses HBV, induced up-regulation of MICA. The up-regulation of MICA increased the lysis of HepG2.2.15 cells by NK cells. Our results suggest that HBV compromises the innate immune system in HCC patients and that inhibition of HBV replication by siRNAs may enhance the antitumor immune response.
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Affiliation(s)
- Kai-Fu Tang
- Chongqing University of Medical Sciences, Chongqing, 400010, People's Republic of China.
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Tang KF, Ren H, Cao J, Zeng GL, Xie J, Chen M, Wang L, He CX. Decreased Dicer expression elicits DNA damage and up-regulation of MICA and MICB. ACTA ACUST UNITED AC 2008; 182:233-9. [PMID: 18644891 PMCID: PMC2483517 DOI: 10.1083/jcb.200801169] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
RNA interference (RNAi) acts constitutively to silence the innate immune response, and innate immunity genes are misregulated in Dicer-deficient Caenorhabditis elegans. Here, we show that inhibition of Dicer expression by RNAi in human cells up-regulates major histocompatibility complex class I–related molecules A and B (MICA and MICB). MICA and MICB are innate immune system ligands for the NKG2D receptor expressed by natural killer cells and activated CD8(+)T cells. We reveal that knockdown of Dicer elicits DNA damage. Up-regulation of MICA and MICB by Dicer knockdown is prevented by pharmacologic or genetic inhibition of DNA damage pathway components, including ataxia telangiectasia mutated (ATM) kinase, ATM- and Rad3-related kinase, or checkpoint kinase 1. Therefore we conclude that up-regulation of MICA and MICB is the result of DNA damage response activation caused by Dicer knockdown. Our results suggest that RNAi is indirectly linked to the human innate immune system via the DNA damage pathway.
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Affiliation(s)
- Kai-Fu Tang
- Key Laboratory of Molecular Biology for Infectious Diseases of the State Ministry of Education, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, People's Republic of China.
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37
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Tang KF, He CX, Zeng GL, Wu J, Song GB, Shi YS, Zhang WG, Huang AL, Steinle A, Ren H. Induction of MHC class I-related chain B (MICB) by 5-aza-2′-deoxycytidine. Biochem Biophys Res Commun 2008; 370:578-83. [DOI: 10.1016/j.bbrc.2008.03.131] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Accepted: 03/25/2008] [Indexed: 11/25/2022]
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Tang KF, Xie J, Chen M, Liu Q, Zhou XY, Zeng W, Huang AL, Zuo GQ, Wang Y, Xiang R, Ren H. Knockdown of damage-specific DNA binding protein 1 (DDB1) enhances the HBx-siRNA-mediated inhibition of HBV replication. Biologicals 2008; 36:177-83. [PMID: 18289873 DOI: 10.1016/j.biologicals.2007.11.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2007] [Revised: 09/02/2007] [Accepted: 11/12/2007] [Indexed: 12/12/2022] Open
Abstract
Recent studies have demonstrated that the effect of inhibition of HBV replication can be achieved by RNA interference (RNAi) at both the cellular and organismal levels. However, HBV replication cannot be completely inhibited by this method. To completely inhibit HBV replication, new strategies for improving the inhibition efficacy of HBV-specific siRNAs are needed. In this study, we demonstrated that knockdown of damage-specific DNA binding protein 1(DDB1), a protein involved in nucleotide-excision repair and HBV replication, significantly enhanced the HBx-siRNA-mediated inhibition of HBV replication. Although knockdown of DDB1 may be toxic to normal liver cells, our results indeed suggest a new direction to enhance the efficacy of HBV-siRNA-mediated inhibition of HBV replication.
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Affiliation(s)
- Kai-Fu Tang
- Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Institute for Viral Hepatitis, The Second Affiliated Hospital, Chongqing University of Medical Sciences, Chongqing 400010, PR China.
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Tang KF, Wang Y, Wang P, Chen M, Chen Y, Hu HD, Hu P, Wang B, Yang W, Ren H. Upregulation of PHLDA2 in Dicer knockdown HEK293 cells. Biochim Biophys Acta Gen Subj 2007; 1770:820-5. [PMID: 17303335 DOI: 10.1016/j.bbagen.2007.01.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2006] [Revised: 01/05/2007] [Accepted: 01/08/2007] [Indexed: 12/20/2022]
Abstract
It has been reported that RNAi-dependent chromatin silencing in vertebrates is not restricted to the centromeres. To address whether RNAi machinery could regulate the chromatin structure of imprinted genes, we knocked down Dicer in HEK293 cells and found that the expression of PHLDA2, one of the several genes in the imprinted gene domain of 11p15.5, was specifically upregulated. This was accompanied by a shift towards more activated chromatin at PHLDA2 locus as indicated by change in H3K9 acetylation, however, the methylation state at this locus was not affected. Furthermore, we found that PHLDA2 was downregulated in growth-arrested HEK293 cells induced by either serum deprivation or contact inhibition. This suggests that PHLDA2 upregulation might be a direct result of Dicer depletion rather than the consequence of growth arrest induced by Dicer knockdown. Considering the reports that there is consistent placental outgrowth in PHLDA2 knockout mice and that PHLDA2 overexpression in mice causes growth inhibition, we speculate that PHLDA2 may be a candidate for contributing to the reduced growth rate of Dicer-deficient cells and the very early embryonic lethality in Dicer knockout mice.
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Affiliation(s)
- Kai-Fu Tang
- Key Laboratory of Molecular Biology for Infectious Diseases of State Ministry of Education, The second Affiliated Hospital, Institute for Viral Hepatitis, Chongqing University of Medical Sciences, Chongqing 400010, PR China.
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40
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Yan YG, Wong PCY, Tan CG, Tang KF. Integrated centralized utility services to a chemical complex on Jurong Island, Singapore. Water Sci Technol 2003; 47:15-20. [PMID: 12578168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
SUT pioneered centralized utility services for the chemical industry on Jurong Island, which are cost-effective due to economies of scale, reliable due to inter-connection of satellite operations, and customer tailored for special requirements. The utility services range from the supply of steam and water, wastewater treatment, incineration, terminalling, service corridor to fire fighting. Among the services, water management achieves the complete cycle from wastewater treatment to effluent recycling.
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Affiliation(s)
- Y G Yan
- SUT Sakra Pte Ltd, 51 Sakra Avenue, Singapore 627894
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Tang KF, Lightner DV. Detection and quantification of infectious hypodermal and hematopoietic necrosis virus in penaeid shrimp by real-time PCR. Dis Aquat Organ 2001; 44:79-85. [PMID: 11324819 DOI: 10.3354/dao044079] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A real-time PCR method using a fluorogenic 5' nuclease assay and a PE Applied Biosystems GeneAmp 5700 sequence detector was developed to detect infectious hypodermal and hematopoietic necrosis virus (IHHNV) in penaeid shrimp. A pair of PCR primers to amplify an 81 bp DNA fragment and a fluorogenic probe (TaqMan probe) were selected from ORF1 (open reading frame 1) of the IHHNV genome. The primers and TaqMan probe used in this assay were shown to be specific for IHHNV and did not react with either hepatopancreatic parvovirus (HPV), white-spot syndrome virus (WSSV), or shrimp DNA. A plasmid, pIHHNV-P4, containing the target IHHNV sequence was constructed and used as a positive control. The concentration of pIHHNV-P4 was determined through spectrophotometric analysis and the plasmid was used for quantitative studies. This real-time PCR assay had a detection limit of 10 copies and a log-linear range up to 5 x 10(7) copies of IHHNV DNA. The assay was then used to quantify IHHNV in infected shrimp collected from 5 locations: Hawaii, Panama, Mexico, Guam, and the Philippines. The quantitative analysis showed that wild-caught, large juvenile Penaeus stylirostris collected from the Gulf of California (Mexico) in 1996 were naturally infected with IHHNV and contained up to 10(9) copies of IHHNV microg(-1) of DNA. Similar quantities of IHHNV were detected in hatchery-raised, small juvenile P. stylirostris collected from Guam in 1995 and in farm-raised, post-larval P. monodon from the Philippines in 1996. Laboratory-infected P. stylirostris contained approximately 10(8) copies of IHHNV 31 d after being fed with IHHNV-infected shrimp tissue. In contrast, individuals of Super Shrimp, a line of P. stylirostris selected for IHHNV resistance, showed no signs of infection 32 d after ingesting IHHNV-infected shrimp tissue. Laboratory-infected P. vannamei also contained approximately 10(8) copies of IHHNV 30 d after being fed infected shrimp tissue. A time-course study of IHHNV replication in juvenile P. vannamei showed that the doubling time in the exponential growth phase was approximately 22 h.
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Affiliation(s)
- K F Tang
- Department of Veterinary Science and Microbiology, University of Arizona, Tucson 85721, USA.
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Tang KF, Tan SY, Chan SH, Chong SM, Loh KS, Tan LK, Hu H. A distinct expression of CC chemokines by macrophages in nasopharyngeal carcinoma: implication for the intense tumor infiltration by T lymphocytes and macrophages. Hum Pathol 2001; 32:42-9. [PMID: 11172294 DOI: 10.1053/hupa.2001.20886] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Nasopharyngeal carcinoma (NPC) is characterized by harboring Epstein-Barr virus genes in the tumor cells and an intense infiltration of leukocytes in the tumor tissue. These infiltrating cells are mainly composed of T lymphocytes and macrophages. The mechanism of this intense infiltration has long been a puzzle. We attempted to address this issue by studying the expression of CC chemokines, which are responsible for recruiting both T cells and macrophages, by an immunohistochemical approach. In biopsies obtained from nasopharynx of 17 NPC patients that contained tumor cells, expression of macrophage inflammatory protein 1alpha (MIP-1alpha), MIP-1beta, macrophage chemoattractant protein-1 (MCP-1), MCP-2, MCP-3, and RANTES was detected in the tumor-infiltrating cells, with MIP-1alpha and MCP-1 found in nearly all biopsies and the others relatively less frequently. Furthermore, expression of interferon-gamma (IFN-gamma) was also observed in tumor-infiltrating cells. In contrast, CC chemokines and IFN-gamma were rarely expressed in the 13 control biopsies that were either normal or with nonspecific inflammation, and in 4 biopsies from untreated NPC patients that contained no tumor cells. Using an immunofluorescent double-staining method, MIP-1alpha and MCP-1 were identified to be associated with macrophages, and IFN-gamma with T cells. Moreover, expression of CCR2 and CCR5, the receptors for these chemokines, was also detected in the tumor-infiltrating cells. These data indicate that the intense tumor infiltration by T cells and macrophages is a result of active recruitment. It seems possible that the intense infiltration of leukocytes in NPC tumor tissue is initiated by the activated tumor-reactive T cells. T cells migrate into the tumor tissue in an antigen-specific mode, and IFN-gamma secreted from these pioneer T cells activates tissue macrophages to express CC chemokines, especially MIP-1alpha and MCP-1, which consequently recruit more T cells and macrophages into the tumor tissue.
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MESH Headings
- Antibodies, Viral/blood
- Chemokines, CC/biosynthesis
- Herpesvirus 4, Human/genetics
- Herpesvirus 4, Human/immunology
- Humans
- Immunoglobulin A/blood
- Immunohistochemistry
- In Situ Hybridization
- Interferon-gamma/biosynthesis
- Lymphocytes, Tumor-Infiltrating/chemistry
- Lymphocytes, Tumor-Infiltrating/pathology
- Macrophages/chemistry
- Macrophages/pathology
- Nasopharyngeal Neoplasms/immunology
- Nasopharyngeal Neoplasms/metabolism
- Nasopharyngeal Neoplasms/pathology
- RNA, Viral/genetics
- Receptors, CCR2
- Receptors, CCR5/biosynthesis
- Receptors, Chemokine/biosynthesis
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Affiliation(s)
- K F Tang
- Department of Microbiology, Faculty of Medicine, National University of Singapore, Republic of Singapore
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Tang KF, Chan SH, Loh KS, Chong SM, Wang D, Yeoh KH, Hu H. Increased production of interferon-gamma by tumour infiltrating T lymphocytes in nasopharyngeal carcinoma: indicative of an activated status. Cancer Lett 1999; 140:93-8. [PMID: 10403546 DOI: 10.1016/s0304-3835(99)00056-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Undifferentiated nasopharyngeal carcinomas (UNPC) are characterised by an association with Epstein-Barr virus and an abundant lymphoid stroma. We studied the functional status of the infiltrating T cells in ten UNPC biopsies using an immunohistochemical approach. Twelve non-NPC biopsies were included as controls. Tumour cells of UNPC were positive for HLA class I (10/10) and II (8/10), LMP1 (3/10), and CD86 (6/10). Tumour infiltrating T cells (TILs) were detected with antibodies directed at CD3, CD4, and CD8, and shown to be comparable to that in the control biopsies. Although expression of CD28 was shown to be decreased in TILs, expression of CD25 and IFN-gamma at a relatively high percentage could be consistently detected in the UNPC biopsies. These data suggest that TILs in UNPC are in an activated status, and this T cell response is possibly directed at the tumour cells.
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Affiliation(s)
- K F Tang
- Department of Microbiology, Faculty of Medicine, The National University of Singapore, Singapore
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Abstract
A portion of the genome of yellow head virus (YHV) of penaeid shrimp was cloned and the cDNA fragment (1161 bp) was designated clone 3-27. The fragment was labeled with digoxigenin and hybridized in situ to tissue sections of YHV-infected Penaeus vannamei. Positively reacting tissues included those of the lymphoid organ, cuticular epithelium, and gills. In addition, connective tissue of hepatopancreas, heart, antennal gland, hematopoietic organ, nerve tract, midgut cecum and muscle reacted to the probe. The probe was highly specific since it hybridized only to tissues from YHV-infected shrimp. It did not react to those of uninfected shrimp or shrimp infected with WSSV (white spot syndrome virus), IHHNV (infectious hypodermal and hematopoietic necrosis virus), or TSV (Taura syndrome virus). The clone was sequenced, and primers were synthesized for rapid detection of YHV in hemolymph using RT-PCR (reverse transcription-polymerase chain reaction). The strand that constituted the viral sequence in the cDNA was also determined via RT-PCR and in situ hybridization with a single-stranded RNA (ssRNA) probe.
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Affiliation(s)
- K F Tang
- Department of Veterinary Science and Microbiology, University of Arizona, Tucson 85721, USA.
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45
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Lu CC, Tang KF, Chen SN. Identification and genetic characterization of yeasts isolated from freshwater prawns, Macrobrachium rosenbergii de Man, in Taiwan. J Fish Dis 1998; 21:185-192. [PMID: 21361973 DOI: 10.1046/j.1365-2761.1998.00094.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Since 1987, farmers in southern Taiwan have reported significant disease-related mortalities in freshwater prawns. Most mortalities have occurred during the winter, and usually almost all the adult prawns die within 4-5 days after clinical signs appear. Histopathological studies show that cells in hepatopancreatic ducts and tubules are vacuolized and degenerated. Large numbers of membrane-bound yeast aggregates are observed in the affected tissues. Two hundred and seventeen yeast isolates were obtained from diseased prawns, pond water and sediments from six areas. DNA restriction fragment length polymorphism (RFLP) was used to analyse the yeast genomes and to categorize them into five groups. Conventional biochemical and metabolic methods were then used to identify the yeasts of each group. The results showed that two strains of Candida sake (I and II), Pichia anomala, Endomyces fibuliger and Candida famata were present. In addition, the RAPD (random amplified polymorphic DNA) method was used to determine their genomic similarities. Two strains (I and II) of C. sake were the most similar (72%). C. sake I appears to be the primary causative agent of disease, based on frequencies of occurrence of the yeasts found in the diseased prawns.
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Affiliation(s)
- C C Lu
- 1 Department of Mathematics and Science Education, National Taipei Teachers College, Taipei, Taiwan, 2 Department of Zoology, National Taiwan University, Taipei, Taiwan
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Abstract
We describe a patient with Ménétrier's disease in whom acute administration of ranitidine reduced gastric protein loss more effectively than cimetidine or propantheline. This patient went into remission following a course of ranitidine. We reviewed the literature on remissions in Ménétrier's disease occurring without surgery. More detailed studies of various anti-secretory agents on individual patients are required to determine whether or not they are truly efficacious.
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Affiliation(s)
- J Y Kang
- Department of Medicine, National University Hospital, Singapore
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47
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Tang KF, Ts'o PO, Lesko SA. Production of interferon-beta upon induction with polyinosinic acid:polycytidylic acid during the cell cycle of human fibroblasts. Exp Cell Res 1989; 181:432-41. [PMID: 2647497 DOI: 10.1016/0014-4827(89)90100-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The production of interferon-beta was examined at various stages of the cell cycle in synchronized and unsynchronized cell populations induced by poly(I):poly(C). Human fibroblasts were synchronized with mitotic detachment and, at different stages of the cell cycle, poly(I):poly(C) was added for induction of interferon-beta. One hour after induction, cell-free medium was collected and assayed for secreted interferon-beta. The cells were then fixed and stained with a DNA-specific fluorochrome, 4',6-diamidino-2-phenylindole (DAPI), for cell cycle analysis by microfluorometry. The data indicated that interferon-beta was produced in every stage examined of the cell cycle. In addition, the level of intracellular interferon-beta was quantitatively measured in single cells of an unsynchronized cell population using a specific antibody. In the same individual cell, DAPI fluorescence intensity was measured for determination of the cell cycle position. The results show that interferon-beta protein can be detected throughout the cell cycle.
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Affiliation(s)
- K F Tang
- Division of Biophysics, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, Maryland 21205
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48
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Tang KF, Brass LM, Tatemichi TK, Duterte D, Sacco RL, Mohr JP. Transcranial Doppler in cerebrovascular disease. Singapore Med J 1988; 29:489-97. [PMID: 3071848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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49
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Lam LK, Tang KF, Sundram FX, Ang ES, Johan A, Chia BL, Tan A. Thallium-201 myocardial stress imaging: a study of its value in the diagnosis of coronary artery disease and the location of diseased vessel. Singapore Med J 1987; 28:6-12. [PMID: 3603076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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50
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Tang KF, Yeow YK, Chee YC, Tjia TL. Transient global amnesia: a report of three cases and review of the literature. Singapore Med J 1986; 27:428-31. [PMID: 3823949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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