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Cui Z, He J, Zhu J, Ni W, Liu L, Bian Z, Mao S, Gu S, Shan Y, Chu Z, Wu Q, Lu J, Liu Y, Sun F, Pan Q, Zhang Y, Huang N, Ma J. O-GlcNAcylated LARP1 positively regulated by circCLNS1A facilitates hepatoblastoma progression through DKK4/β-catenin signalling. Clin Transl Med 2023; 13:e1239. [PMID: 37070251 PMCID: PMC10111636 DOI: 10.1002/ctm2.1239] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 03/25/2023] [Accepted: 03/30/2023] [Indexed: 04/19/2023] Open
Abstract
BACKGROUND Accumulating studies have shown that La-related protein 1 (LARP1) is involved in the occurrence and development of various tumours. However, the expression pattern and biological role of LARP1 in hepatoblastoma (HB) remain unclear so far. METHODS LARP1 expression level in HB and adjacent normal liver tissues was analysed by qRT-PCR, Western blotting and immunohistochemistry assays. The prognostic significance of LARP1 was evaluated by Kaplan-Meier method and multivariate Cox regression analysis. In vitro and in vivo functional assays were implemented to clarify the biological effects of LARP1 on HB cells. Mechanistically, the regulatory roles of O-GlcNAcylation and circCLNS1A in LARP1 expression were investigated by co-immunoprecipitation (co-IP), immunofluorescence, RNA immunoprecipitation (RIP), RNA pull-down and protein stability assays. Moreover, RNA-sequencing, co-IP, RIP, mRNA stability and poly(A)-tail length assays were performed to investigate the association between LARP1 and DKK4. The expression and diagnostic significance of plasma DKK4 protein in multi-centre cohorts were evaluated by ELISA and ROC curves. RESULTS LARP1 mRNA and protein levels were remarkably elevated in HB tissues and associated with worse prognosis of HB patients. LARP1 knockdown abolished cell proliferation, triggered cell apoptosis in vitro as well as prohibited tumour growth in vivo, whereas LARP1 overexpression incited HB progression. Mechanistically, O-GlcNAcylation of LARP1 Ser672 by O-GlcNAc transferase strengthened its binding to circCLNS1A and then protected LARP1 from TRIM-25-mediated ubiquitination and proteolysis. LARP1 upregulation subsequently led to DKK4 mRNA stabilisation by competitively interacting with PABPC1 to prevent DKK4 mRNA from B-cell translocation gene 2-dependent deadenylation and degradation, thus facilitating β-catenin protein expression and nuclear import. CONCLUSION This study indicates that upregulated protein level of O-GlcNAcylated LARP1 mediated by circCLNS1A promotes the tumorigenesis and progression of HB through LARP1/DKK4/β-catenin axis. Hence, LARP1 and DKK4 are promising therapeutical target and diagnostic/prognostic plasma biomarker for HB.
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Affiliation(s)
- Zhongqi Cui
- Department of Clinical Laboratory, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Jiangtu He
- Department of Clinical Laboratory, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Jiabei Zhu
- Department of Clinical Laboratory Medicine, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University, Shanghai, China
- Shanghai Key Laboratory of Clinical Molecular Diagnostics for Pediatrics, Shanghai, China
| | - Wenxuan Ni
- Department of Clinical Laboratory, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Li Liu
- Department of Clinical Laboratory Medicine, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University, Shanghai, China
- Shanghai Key Laboratory of Clinical Molecular Diagnostics for Pediatrics, Shanghai, China
| | - Zhixuan Bian
- Department of Clinical Laboratory Medicine, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University, Shanghai, China
- Shanghai Key Laboratory of Clinical Molecular Diagnostics for Pediatrics, Shanghai, China
| | - Siwei Mao
- Department of Clinical Laboratory Medicine, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University, Shanghai, China
- Shanghai Key Laboratory of Clinical Molecular Diagnostics for Pediatrics, Shanghai, China
| | - Song Gu
- Department of Surgery, Shanghai Children's Medical Center, School of medicine, Shanghai Jiaotong University, Shanghai, China
| | - Yuhua Shan
- Department of Surgery, Shanghai Children's Medical Center, School of medicine, Shanghai Jiaotong University, Shanghai, China
| | - Zhexuan Chu
- Department of Clinical Laboratory Medicine, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Qi Wu
- Department of Clinical Laboratory, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
- Shanghai Children's Hospital, Shanghai Jiao Tong University, Shanghai, China
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, China
| | - Jiayi Lu
- Department of Clinical Laboratory, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Ya Liu
- Department of Clinical Laboratory, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
- Department of Laboratory Medicine, Hunan Children's Hospital, Changsha, China
| | - Fenyong Sun
- Department of Clinical Laboratory, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Qiuhui Pan
- Department of Clinical Laboratory Medicine, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University, Shanghai, China
- Shanghai Key Laboratory of Clinical Molecular Diagnostics for Pediatrics, Shanghai, China
- Sanya Women and Children's Hospital Managed by Shanghai Children's Medical Center, Sanya, China
| | - Yue Zhang
- Department of Clinical Laboratory, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
- Department of Central Laboratory, Clinical Medicine Scientific and Technical Innovation Park, Shanghai Tenth People's Hospital, Shanghai, China
| | - Nan Huang
- Department of Clinical Laboratory, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, China
- Department of Central Laboratory, Clinical Medicine Scientific and Technical Innovation Park, Shanghai Tenth People's Hospital, Shanghai, China
| | - Ji Ma
- Department of Clinical Laboratory Medicine, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University, Shanghai, China
- Shanghai Key Laboratory of Clinical Molecular Diagnostics for Pediatrics, Shanghai, China
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Liang J, Sun L, Li Y, Liu W, Li D, Chen P, Wang X, Hui J, Zhou J, Liu H, Cao T, Pang M, Guo M, Wang X, Zhao X, Lu Y. Wnt Signaling Modulator DKK4 Inhibits Colorectal Cancer Metastasis through an AKT/Wnt/β-catenin Negative Feedback Pathway. J Biol Chem 2022; 298:102545. [PMID: 36181792 DOI: 10.1016/j.jbc.2022.102545] [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: 01/21/2022] [Revised: 09/06/2022] [Accepted: 09/07/2022] [Indexed: 12/01/2022] Open
Abstract
Aberrant activation of the Wnt/β-catenin signaling pathway is implicated in most malignant cancers, especially in the initiation and progression of colorectal cancer (CRC). DKK4 is a classical inhibitory molecule of the Wnt/β-catenin pathway, but its role in CRC is ambiguous, and the molecular mechanism remains unclear. Here, we determined DKK4 expression was significantly upregulated in 23 CRC cell lines and 229 CRC tissues when analyzed by quantitative PCR and immunohistochemistry, respectively. Our analysis of tissue samples indicated the survival time of CRC patients with high DKK4 expression was longer than that of patients with medium-low DKK4 expression. We examined the effects of DKK4 on cell proliferation and metastasis by cell counting kit-8 assays, Transwell assays, and subcutaneous and metastatic mouse tumor models, and we discovered that DKK4 silencing promoted the metastasis of CRC cells both in vitro and in vivo. Our RNA-seq analysis revealed that AKT2, FZD6, and JUN, which play important roles in AKT and Wnt signaling, were significantly increased after DKK4 knockdown. DKK4 represses Wnt/β-catenin signaling by repressing FZD6 and AKT2/s552 β-catenin in CRC. Further experiments revealed recombinant Wnt3a and LiCl could induce DKK4 expression. Moreover, our bioinformatics analysis and luciferase reporter assays identified posttranscriptional regulators of DKK4 in CRC cells. In summary, DKK4 is elevated in CRC and inhibits cell metastasis by a novel negative feedback mechanism of the Wnt3a/DKK4/AKT/s552 β-catenin regulatory axis to restrict overactivation of Wnt activity in CRC. Therefore, DKK4 restoration may be applied as a potential CRC therapeutic strategy.
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Affiliation(s)
- Junrong Liang
- Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi'an, China; State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China
| | - Lina Sun
- The Affiliated Children's Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Yujun Li
- Department of Endocrinology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Wanning Liu
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China; College of Life Sciences, Northwest University, Xi'an, China
| | - Danxiu Li
- Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi'an, China; State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China
| | - Ping Chen
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China; Department of Gastroenterology, Xingping People's Hospital, Xianyang, China
| | - Xin Wang
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China; Department of Gastroenterology, General Hospital of Northern Theater Command, Shenyang, China
| | - Juan Hui
- Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi'an, China; State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China
| | - Jinchi Zhou
- Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi'an, China; State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China
| | - Hao Liu
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China
| | - Tianyu Cao
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China
| | - Maogui Pang
- Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi'an, China; State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China
| | - Meng Guo
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China
| | - Xin Wang
- Department of Gastroenterology, Tangdu Hospital, Fourth Military Medical University, Xi'an, China; State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China.
| | - Xiaodi Zhao
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China.
| | - Yuanyuan Lu
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi'an, China.
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Chen YY, Tai YC. Hsa_circ_0006404 and hsa_circ_0000735 Regulated Ovarian Cancer Response to Docetaxel Treatment via Regulating p-GP Expression. Biochem Genet 2021. [PMID: 34255218 DOI: 10.1007/s10528-021-10080-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 05/15/2021] [Indexed: 11/27/2022]
Abstract
Several microRNAs (miRNAs) and circular RNAs (circRNAs) were reported to be involved in the Docetaxel (DTX) chemoresistance of cancer treatment, but the underlying mechanisms remain to be explored. In this study, we established cellular and animal models respectively to study the effect and underlying molecular mechanisms of the dysregulation of circRNA_0006404 and circRNA_0000735 in tumor response to DTX treatment. Quantitative real-time PCR was performed to measure the expression of circRNA_0006404, miR-346, circRNA_0000735, miR-526b, Dickkopf-related protein 3 (DKK3), and Dickkopf-related protein 4 (DKK4) mRNA. The expression of circRNA_0006404 and circRNA_0000735 was remarkably suppressed and activated in DTX-treated SKOV3-R cell lines, respectively. As revealed by luciferase assays, circRNA_0006404 and circRNA_0000735 was found to be respectively targeted by miR-346 and miR-526b, while DKK3 and DKK4 were respectively targeted by miR-346 and miR-526b. Moreover, the expression of DKK3 and DKK4, which were targets of miR-346 and miR-526b, respectively, was significantly altered along with the expression of p-GP. Furthermore, circ_0006404 shRNA and circRNA_0000735 shRNA showed remarkable efficiency in stimulating the expression of circRNA_0006404, miR-346, DKK3, circRNA_0000735, miR-526b, DKK4, and p-GP in cellular and animal models. Accordingly, the cell apoptosis and proliferation were apparently changed by circ_0006404 shRNA and circRNA_0000735 shRNA in both cellular and animal models. In summary, our study found the involvement of the circRNA_0006404/miR-346/DKK3/p-GP and circRNA_0000735/miR-546b/DKK4/p-GP axis in the tumor response to DTX. Both the up-regulation of circRNA_0006404 and down-regulation of circRNA_0000735 could inhibit the expression of p-GP in vivo and ex vivo, leading to the suppressed tumor response to DTX treatment.
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Lou X, Meng Y, Hou Y. A literature review on function and regulation mechanism of DKK4. J Cell Mol Med 2021; 25:2786-2794. [PMID: 33586359 PMCID: PMC7957263 DOI: 10.1111/jcmm.16372] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 06/07/2020] [Revised: 01/19/2021] [Accepted: 02/02/2021] [Indexed: 12/16/2022] Open
Abstract
Dickkopf-related protein 4 (DKK4) is a member of the dickkopf family and an inhibitor of the Wnt/β-catenin signalling pathway. This review surveyed the single nucleotide polymorphisms (SNPs), copy number variations (CNVs), hypermethylation, regulation mechanism, correlation with clinicopathological parameters and chemotherapeutic resistance of DKK4. The signal pathways involved in DKK4 mainly include Wnt/β-catenin pathway and Wnt-JNK pathway independent β-catenin. DKK4 expression was upregulated in Renal Cell Carcinoma (RCC), Colorectal Cancer, Gastric Cancer (GC), Non-small Cell Lung Cancer (NSCLC) and Epithelial Ovarian Cancer (EOC), while downregulated in Hepatocellular Carcinoma (HCC). DKK4 is not only involved in tumour growth, invasion, migration and chemotherapy resistance, but also in osteoblastogenesis and secondary hair or meibomian gland formation. DKK4 has also been linked to schizophrenia.
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Affiliation(s)
- Xiaoli Lou
- Department of Central Laboratory, Songjiang Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yuchen Meng
- Department of Central Laboratory, Songjiang Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Yanqiang Hou
- Department of Central Laboratory, Songjiang Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
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Wang M, Ni B, Zhuang C, Zhao WY, Tu L, Ma XL, Yang LX, Zhang ZG, Cao H. Aberrant accumulation of Dickkopf 4 promotes tumor progression via forming the immune suppressive microenvironment in gastrointestinal stromal tumor. Cancer Med 2019; 8:5352-5366. [PMID: 31353847 PMCID: PMC6718536 DOI: 10.1002/cam4.2437] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 02/20/2019] [Revised: 06/19/2019] [Accepted: 07/11/2019] [Indexed: 12/20/2022] Open
Abstract
Background Drug resistance and tumor recurrence are the major concerns in clinical practices of gastrointestinal stromal tumor (GIST), with the urgent requirement for exploring undiscovered pathways driving malignancy. To deal with these, recent studies have made many efforts to explore prognosis indicators and establish potential therapeutic targets. Methods Expression profiles of different risks of GISTs were described and abundant clinical evidences supported our findings in this study. Following exploration in vitro by cell experiments and verification in vivo using tumor microarray were taken to elucidate the underlying mechanism, which drove the malignancy in GIST. Results Dickkopf 4 (DKK4), as the canonical Wnt pathway antagonist, was unexpectedly and universally upregulated in high‐risk GISTs, and aberrant accumulation of DKK4 was closely correlated with poor prognosis. In addition, tumor‐derived DKK4 could decrease immune cells infiltration and activation in the tumor microenvironment, which decreased the antitumor effects in return. And this phenomenon was recurrent in human tumor specimens. Conclusions Our findings identified DKK4 as a proper tumor biomarker for prognosis predicting and recurrence monitoring, and suggested a novel immune‐escape mechanism driving malignancy in GIST, which might be a potential therapeutic target to improve the effects of canonical RTK therapy and combined immunotherapy.
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Affiliation(s)
- Ming Wang
- Department of Gastrointestinal Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Bo Ni
- Department of Gastrointestinal Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Chun Zhuang
- Department of Gastrointestinal Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Wen-Yi Zhao
- Department of Gastrointestinal Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Lin Tu
- Department of Gastrointestinal Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xin-Li Ma
- Department of Gastrointestinal Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Lin-Xi Yang
- Department of Gastrointestinal Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Zhi-Gang Zhang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hui Cao
- Department of Gastrointestinal Surgery, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
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Sun S, Yu M, Fan Z, Yeh IT, Feng H, Liu H, Han D. DLX3 regulates osteogenic differentiation of bone marrow mesenchymal stem cells via Wnt/β-catenin pathway mediated histone methylation of DKK4. Biochem Biophys Res Commun 2019; 516:171-6. [PMID: 31202458 DOI: 10.1016/j.bbrc.2019.06.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2019] [Accepted: 06/06/2019] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Distal-less homeobox 3 (DLX3) is an important transcription factor involved in the osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs). However, the underlying mechanism is not clear. This study investigated the underlying mechanism of DLX3 in osteogenic differentiation. METHODS DLX3 overexpression and knockdown in cells were achieved using lentiviruses. The osteogenic differentiation of BMSCs was detected using alkaline phosphatase expression, alizarin red staining, real-time quantitative polymerase chain reaction (RT-qPCR), Western blotting, and chromatin immunoprecipitation (ChIP) assays. RESULTS DLX3 overexpression promoted the osteogenic differentiation of BMSCs, whereas DLX3 knockdown reduced the osteogenic differentiation of BMSCs. RT-qPCR and Western blotting assays showed that DLX3 modulated osteogenic differentiation via the Wnt/β-catenin pathway. ChIP-qPCR showed that DLX3 knockdown promoted DKK4 expression by decreasing the enrichment of histone H3 lysine 27 trimethylation (H3K27me3) in the promotor region of DKK4. CONCLUSION Our data implied that DLX3 regulated Wnt/β-catenin pathway through histone modification of DKK4 during the osteogenic differentiation of BMSCs.
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Yang X, Liu Y, Li W, Li A, Sun Q. DKK4-knockdown enhances chemosensitivity of A549/DTX cells to docetaxel. Acta Biochim Biophys Sin (Shanghai) 2018; 49:899-906. [PMID: 28981599 DOI: 10.1093/abbs/gmx086] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 03/03/2017] [Indexed: 12/24/2022] Open
Abstract
Drug resistance greatly limits docetaxel efficiency in the treatment of non-small cell lung cancer (NSCLC). Dickkopf 4 (DKK4), a negative regulator of Wnt/β-catenin pathway, is believed to be involved in various human cancers; whereas the association of DKK4 with acquired docetaxel resistance in NSCLC remains unclear. In the present study, we investigated the involvement of DKK4 in the docetaxel-resistant human lung adenocarcinoma A549 (A549/DTX) cells. Our results showed that DKK4 expression was significantly increased in the A549/DTX cells compared with in the A549 cells, as well as in the culture supernatant of A549/DTX cells. DKK4 overexpression increased the resistance of A549 cells to docetaxel. DKK4-knockdown promoted inhibition of A549/DTX cell growth, and reduced the colony formation and invasion capacity of A549/DTX cells. Moreover, DKK4-knockdown promoted the pro-apoptotic effect of docetaxel characterized with caspase 3 activation and inhibition of BCL-2 expression in A549/DTX cells, which was possibly mediated by inducing the activation of c-Jun N-terminal kinase (JNK)-related signaling pathway. Thus, our results indicated that DKK4-knockdown promoted the cytotoxic and pro-apoptotic activity of A549/DTX cells, which suggests a critical role of DKK4 in docetaxel resistance of the A549 cells and provides the potential to combine docetaxel therapy with DKK4 depletion in treating NSCLC.
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Affiliation(s)
- Xueliang Yang
- Department of Thoracic Surgery, General Hospital of Chinese PLA, Beijing 100853, China
- Department of Thoracic Surgery, Shanxi Provincial Cancer Hospital, Taiyuan 030013, China
| | - Yang Liu
- Department of Thoracic Surgery, General Hospital of Chinese PLA, Beijing 100853, China
| | - Weina Li
- State Key Laboratory of Cancer Biology, The Fourth Military Medical University, Xi'an 710032, China
| | - Aimin Li
- Department of Respiration, First Hospital of Shanxi Medical University, Taiyuan 030001, China
| | - Quan Sun
- Department of Thoracic Surgery, Shanxi Provincial Cancer Hospital, Taiyuan 030013, China
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Abstract
Tumor is the most public health problem. The Wnt signal pathway extensively participates in diverse progresses containing embryonic development, maintenance of homeostasis and tumor pathogenesis. The Wnt signal pathway consists of canonical signal pathway, noncanonical Wnt/PCP pathway and noncanonical Wnt/Ca2+ pathway. The deletion of the ligand of Wnts results in cytoplasmic β-catenin phosphorylation, stopping entry of β-catenin to nuclear in canonical Wnt signaling. Instead, binding of Wnts to frizzled (FZ/FZD) as well as LRP5/6 causes activation of Wnt signal pathways. This facilitates entry of β-catenin to nuclear. The Dickkopf proteins (DKKs) have been known as the antagonist of Wnt signal pathway. A number of research of DKK1, 2, 3 have been reported, however, the effect of DKK4 on tumor process is still mysterious. A more distinct comprehension about the effect of DKK4 on tumorigenesis and tumor process will shed light on biomedical research of DKK4 and tumor research. This review summarizes the current knowledge of DKK4 in various kinds of tumors.
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Affiliation(s)
- Xinjia Cai
- Department of Oral Pathology, Xiangya Stomalogical Hospital, Central South University, 410078, Chansha, Hunan, China
| | - Zhigang Yao
- Department of Oral Pathology, Xiangya Stomalogical Hospital, Central South University, 410078, Chansha, Hunan, China
| | - Long Li
- Department of Oral Pathology, Xiangya Stomalogical Hospital, Central South University, 410078, Chansha, Hunan, China
| | - Junhui Huang
- Department of Oral Pathology, Xiangya Stomalogical Hospital, Central South University, 410078, Chansha, Hunan, China
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Ouyang Y, Pan J, Tai Q, Ju J, Wang H. Transcriptomic changes associated with DKK4 overexpression in pancreatic cancer cells detected by RNA-Seq. Tumour Biol 2016; 37:10827-38. [PMID: 26880586 DOI: 10.1007/s13277-015-4379-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [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: 08/11/2015] [Accepted: 11/04/2015] [Indexed: 11/27/2022] Open
Abstract
The promotion of tumor development by Dickkopf 4 (DKK4) is receiving increased attention. However, the association between DKK4 and pancreatic cancer remains unclear. DKK4 expression was measured in pancreatic ductal adenocarcinoma tissues using qRT-PCR and immunohistochemistry. A DKK4-overexpressing pancreatic cancer cell line was established, and the differentially expressed genes (DEGs) that were induced by DKK4 were identified using transcriptome sequencing. The association between the identified DEGs and pancreatic cancer was assessed using gene ontology (GO), pathway analysis, pathway interaction networks, differentially expressed gene interaction network analysis, and co-expression gene networks. Finally, the accuracy of the analyses was validated using serial paraffin and frozen sections of clinical samples. DKK4 is highly expressed in pancreatic cancer tissues. DEGs of overexpression DKK4 of PANC-1 are mostly upregulated. GO and pathway analysis showed that DKK4 are associated with tumor and organ development and immune inflammation. The mitogen-activated protein kinase (MAPK) signaling pathway was the main signal transduction pathway that showed significant enrichment in overexpression DKK4 of PANC-1. The results of GO, pathway analyses, and differentially expressed gene interaction network identified genes that are closely associated with tumor development, including MAPK3, PIK3R3, VAV3, JAG1, and Notch3. The immunohistochemistry and immunofluorescence results suggested that DKK4 is co-expressed with MAPK3 and VAV3 in pancreatic cancer tissues. The results presented here show for the first time that DKK4 is highly expressed in pancreatic cancer tissues. Bioinformatics analysis of a DKK4-overexpressing of PANC-1 identified several oncogenes that are closely associated with tumors, and the MAPK signaling pathway is the core signal transduction pathway. DKK4 can be co-expressed with MAPK3 and VAV3 in pancreatic ductal adenocarcinoma tissues. Thus, DKK4 may have function on the development and progression of pancreatic cancer.
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Affiliation(s)
- Yongsheng Ouyang
- Institute of Hepatopancreatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, 400038, People's Republic of China
| | - Juncheng Pan
- Institute of Hepatopancreatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, 400038, People's Republic of China
| | - Qiang Tai
- Organ transplantation centre, First Affiliated Hospital Sun Yat-sen University, 58 #, 2nd ZhongShan Road, Guangzhou, GD, 510080, China.
| | - Jingfang Ju
- Translational Research Laboratory, Department of Pathology, Stony Brook University, Stony Brook, NY, 11794, USA.
| | - Huaizhi Wang
- Institute of Hepatopancreatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, 400038, People's Republic of China.
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Chi HC, Liao CH, Huang YH, Wu SM, Tsai CY, Liao CJ, Tseng YH, Lin YH, Chen CY, Chung IH, Wu TI, Chen WJ, Lin KH. Thyroid hormone receptor inhibits hepatoma cell migration through transcriptional activation of Dickkopf 4. Biochem Biophys Res Commun 2013; 439:60-5. [PMID: 23958302 DOI: 10.1016/j.bbrc.2013.08.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [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: 08/06/2013] [Accepted: 08/08/2013] [Indexed: 11/30/2022]
Abstract
Triiodothyronine (T3) is a potent form of thyroid hormone mediates several physiological processes including cellular growth, development, and differentiation via binding to the nuclear thyroid hormone receptor (TR). Recent studies have demonstrated critical roles of T3/TR in tumor progression. Moreover, long-term hypothyroidism appears to be associated with the incidence of human hepatocellular carcinoma (HCC), independent of other major HCC risk factors. Dickkopf (DKK) 4, a secreted protein that antagonizes the canonical Wnt signaling pathway, is induced by T3 at both mRNA and protein levels in HCC cell lines. However, the mechanism underlying T3-mediated regulation of DKK4 remains unknown. In the present study, the 5' promoter region of DKK4 was serially deleted, and the reporter assay performed to localize the T3 response element (TRE). Consequently, we identified an atypical direct repeat TRE between nucleotides -1645 and -1629 conferring T3 responsiveness to the DKK4 gene. This region was further validated using chromatin immunoprecipitation (ChIP) and electrophoretic mobility shift assay (EMSA). Stable DKK4 overexpression in SK-Hep-1 cells suppressed cell invasion and metastatic potential, both in vivo andin vitro, via reduction of matrix metalloproteinase-2 (MMP-2) expression. Our findings collectively suggest that DKK4 upregulated by T3/TR antagonizes the Wnt signal pathway to suppress tumor cell progression, thus providing new insights into the molecular mechanism underlying thyroid hormone activity in HCC.
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Affiliation(s)
- Hsiang-Cheng Chi
- Department of Biochemistry, School of Medicine, Chang-Gung University, Taoyuan 333, Taiwan, ROC
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