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Yin X, He Z, Chen K, Ouyang K, Yang C, Li J, Tang H, Cai M. Unveiling the impact of CDK8 on tumor progression: mechanisms and therapeutic strategies. Front Pharmacol 2024; 15:1386929. [PMID: 38606172 PMCID: PMC11006979 DOI: 10.3389/fphar.2024.1386929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Accepted: 03/14/2024] [Indexed: 04/13/2024] Open
Abstract
CDK8 is an important member of the cyclin-dependent kinase family associated with transcription and acts as a key "molecular switch" in the Mediator complex. CDK8 regulates gene expression by phosphorylating transcription factors and can control the transcription process through Mediator complex. Previous studies confirmed that CDK8 is an important oncogenic factor, making it a potential tumor biomarker and a promising target for tumor therapy. However, CDK8 has also been confirmed to be a tumor suppressor, indicating that it not only promotes the development of tumors but may also be involved in tumor suppression. Therefore, the dual role of CDK8 in the process of tumor development is worth further exploration and summary. This comprehensive review delves into the intricate involvement of CDK8 in transcription-related processes, as well as its role in signaling pathways related to tumorigenesis, with a focus on its critical part in driving cancer progression.
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Affiliation(s)
- Xiaomin Yin
- Department of Radiotherapy, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, China
| | - Zhilong He
- Department of Radiotherapy, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, China
| | - Kun Chen
- Department of Radiotherapy, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, China
| | - Kai Ouyang
- Department of Radiotherapy, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, China
| | - Changxuan Yang
- Department of Radiotherapy, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, China
| | - Jianjun Li
- Department of Urological Surgical, The Second Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, China
| | - Hailin Tang
- State Key Laboratory of Oncology in South China, Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Manbo Cai
- Department of Radiotherapy, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, China
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Wei W, Xu T, Zhang Y, Huang Y, Wang X. Upregulation of long noncoding RNA linc02544 and its association with overall survival rate and the influence on cell proliferation and migration in lung squamous cell carcinoma. Discov Oncol 2022; 13:41. [PMID: 35635595 PMCID: PMC9151984 DOI: 10.1007/s12672-022-00501-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 05/18/2022] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Long noncoding RNAs (lncRNAs) exert crucial biological functions by regulating miRNAs, which are implicated in cancer progression and tumorigenesis. A previous study has indicated that lncRNA linc02544 expression is upregulated in lung adenocarcinoma, whereas, the role of linc02544 in LUSC is elusive. METHODS The differential linc02544 expression in LUSC tissues and adjacent non-tumor tissues were evaluated with RT-qPCR. Kaplan-Meier curve was conducted to evaluate the clinical prognostic significance of linc02544. Then cellular experiments were performed to assess the influence of linc02544 in LUSC proliferation, invasion, and migration, and a western blot assay was used to measure the metastasis-related protein levels. The downstream miRNAs were verified using the LncBase Experimental v.2 database and dual-luciferase reporter assay. RESULTS Linc02544 was overexpressed in LUSC tissues from positive lymph node metastasis-positive and TNM high-stage patients. Low linc02544 expression was associated with a longer survival rate. Downregulation of linc02544 by si-linc02544 restrained cell growth capacities, migration, and invasion abilities. Expression of MMP-2, MMP-9, and vimentin was decreased while E-cadherin was increased in si-linc02544 cells compared with that in untreated cells. Mechanistically, we identified that linc02544 acted as a sponge of miR-138-5p, which expression had a negative correlation. E2F3 was a potential target of miR-138-5p, CONCLUSIONS: Notably, high linc02544 expression was associated with severe clinical parameters and was a putative prognostic predictor for patients with LUSC. Downregulation of linc02544 may weaken the LUSC cell proliferation, migration, and invasion by regulating miR-138-5p/E2F3, which maybe serve as a biomarker for the prognosis and target treatment of LUSC.
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Affiliation(s)
- Wei Wei
- Department of Cardiothoracic Surgery, Jinling Hospital, Nanjing University School of Medicine, Jiangsu, 210002, China
| | - Teng Xu
- Department of General Surgery, The Affiliated Hospital of Xuzhou Medical University, Jiangsu, 221000, China
| | - Ying Zhang
- Department of Pathology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, 210002, Jiangsu, China
| | - Yong Huang
- Department of Medical Oncology, Cancer Center of Jinling Hospital, No. 34, 34 Biao, Yanggongjing Street, Nanjing, 210002, Jiangsu, China.
| | - Xiang Wang
- Department of Medical Oncology, Xuzhou Central Hospital, 199 Jiefang South Road, Xuzhou, 221009, Jiangsu, China.
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Zhang Y, Dou X, Kong Q, Li Y, Zhou X. Circ_0075804 promotes the malignant behaviors of retinoblastoma cells by binding to miR-138-5p to induce PEG10 expression. Int Ophthalmol 2021; 42:509-523. [PMID: 34633608 DOI: 10.1007/s10792-021-02067-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 09/21/2021] [Indexed: 12/16/2022]
Abstract
BACKGROUND It has been gradually recognized that circular RNAs (circRNAs) are important modulators in multiple malignancies. Here, we analyzed the function of circ_0075804 and explored its associated mechanism in regulating retinoblastoma (RB) progression. METHODS Reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and Western blot assay were utilized to measure RNA and protein expression, respectively. Cell proliferation was analyzed by Cell counting kit-8 (CCK8) assay and 5-Ethynyl-2'-deoxyuridine (EdU) assay. Cell apoptosis was assessed by flow cytometry. Cell migration and invasion abilities were analyzed by wound healing assay and transwell invasion assay. Dual-luciferase reporter assay and RNA immunoprecipitation (RIP) assay were applied to verify intermolecular target relations. Xenograft tumor model was used to analyze the role of circ_0075804 in tumor growth in vivo. RESULTS Circ_0075804 expression was markedly up-regulated in RB tissues and cell lines. Circ_0075804 knockdown restrained the proliferation, migration and invasion whereas promoted the apoptosis of RB cells. Circ_0075804 acted as a molecular sponge for microRNA-138-5p (miR-138-5p), and circ_0075804 silencing-induced effects were partly reversed by miR-138-5p knockdown in RB cells. MiR-138-5p interacted with the 3' untranslated region (3'UTR) of paternally expressed 10 (PEG10). Circ_0075804 positively regulated PEG10 level by sponging miR-138-5p in RB cells. PEG10 overexpression largely overturned miR-138-5p overexpression-mediated effects in RB cells. Circ_0075804 knockdown blocked xenograft tumor growth in vivo. CONCLUSION Circ_0075804 promoted RB progression via miR-138-5p-dependent regulation of PEG10, which provided new insight in RB therapy.
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Affiliation(s)
- Yanling Zhang
- Department of Ophthalmology, Shenzhen Eye Hospital, Shenzhen Eye Institute, Jinan University, No. 18 Zetian Road, Futian District, Shenzhen, 518040, Guangdong Province, China.
| | - Xiaoyan Dou
- Department of Ophthalmology, The Second People's Hospital of Shenzhen, Shenzhen, Guangdong Province, China
| | - Qinghui Kong
- Department of Ophthalmology, The Second People's Hospital of Shenzhen, Shenzhen, Guangdong Province, China
| | - Yuying Li
- Department of Ophthalmology, School of Medical Technology and Nursing, Shenzhen Polytechnic, Shenzhen, Guangdong Province, China
| | - Xing Zhou
- Department of Ophthalmology, Shenzhen Longhua District Maternity & Child Healthcare Hospital, Shenzhen, Guangdong Province, China
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Gao LF, Li W, Liu YG, Zhang C, Gao WN, Wang L. Inhibition of MIR4435-2HG on Invasion, Migration, and EMT of Gastric Carcinoma Cells by Mediating MiR-138-5p/Sox4 Axis. Front Oncol 2021; 11:661288. [PMID: 34532282 PMCID: PMC8438303 DOI: 10.3389/fonc.2021.661288] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 07/19/2021] [Indexed: 12/24/2022] Open
Abstract
Background The previous investigations have identified that long non-coding RNA (lncRNAs) act as crucial regulators in gastric carcinoma. However, the function of lncRNA MIR4435-2HG in the modulation of gastric carcinoma remains elusive. Here, we aimed to explore the role of MIR4435-2HG in gastric carcinoma. Method The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) were applied to select the differently expressed lncRNAs in gastric carcinoma. The qRT-PCR was applied to analyze MIR4435-2HG expression in carcinoma tissues and cell lines. The effect of MIR4435-2HG on proliferation, invasion, migration, and apoptosis of gastric carcinoma cells was detected by Cell Counting Kit-8 (CCK-8) assays, transwell assays, and flow cytometry in vitro. A subcutaneous tumor model was constructed to examine the tumor growth of gastric carcinoma cells after knocking out MIR4435-2HG. RNA immunoprecipitation and luciferase reporting assays were applied to evaluate the interaction of MIR4435-2HG, miR-138-5p, and Sox4. Results The bioinformatics analysis based on TCGA and GEO databases indicated that MIR4435-2HG was obviously elevated in gastric carcinoma samples. The qRT-PCR analysis revealed that MIR4435-2HG was upregulated in clinical gastric carcinoma tissues and cells. The high expression of MIR4435-2HG is associated with the poor survival rate of patients. The knockout of MIR4435-2HG could repress the proliferation, invasion, migration, and epithelial–mesenchymal transition (EMT) and accelerate the apoptosis of gastric carcinoma cells. Moreover, the deletion of MIR4435-2HG was able to attenuate the tumor growth in vivo. Mechanically, we identified that MIR4435-2HG enhanced Sox4 expression by directly interacting with miR-138-5p as a competitive endogenous RNA (ceRNA) in gastric carcinoma cells, in which Sox4 was targeted by miR-138-5p. Conclusion MIR4435-2HG is elevated in gastric carcinoma cells and contributes to the growth, metastasis, and EMT of gastric carcinoma cells by targeting miR-138-5p/Sox4 axis. MIR4435-2HG may be applied as a potential therapeutic target in gastric carcinoma.
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Affiliation(s)
- Li-Fei Gao
- The Third Department of General Surgery, Cangzhou Central Hospital, Cangzhou, China
| | - Wei Li
- The Second Department of General Surgery, Cangzhou Central Hospital, Cangzhou, China
| | - Ya-Gang Liu
- The Second Department of General Surgery, Cangzhou Central Hospital, Cangzhou, China
| | - Cui Zhang
- The Second Department of General Surgery, Cangzhou Central Hospital, Cangzhou, China
| | - Wei-Na Gao
- The Fourth Department of Endocrinology, Cangzhou Central Hospital, Cangzhou, China
| | - Liang Wang
- The Second Department of General Surgery, Cangzhou Central Hospital, Cangzhou, China
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Liu T, Meng J, Zhang Y. miR‑592 acts as an oncogene and promotes medullary thyroid cancer tumorigenesis by targeting cyclin‑dependent kinase 8. Mol Med Rep 2020; 22:3316-3326. [PMID: 32945439 PMCID: PMC7453674 DOI: 10.3892/mmr.2020.11392] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 03/25/2020] [Indexed: 02/07/2023] Open
Abstract
Medullary thyroid carcinoma (MTC) is a relatively rare subtype of thyroid cancer, accounting for 5‑10% of all cases of thyroid cancer worldwide. Due to the current lack of knowledge regarding the tumorigenesis of MTC, the clinical treatment of MTC remains a challenge. It has been reported that microRNAs (miRNAs) regulate the progression of MTC; however, the regulatory network of miRNAs and the exact underlying mechanisms are not completely understood. In the present study, an miRNA expression profile (GSE40807), consisting of 80 samples, was downloaded and analyzed using Gene Expression Omnibus‑2R to identify differentially expressed miRNAs between MTC and normal samples. miR‑592 expression levels were significantly increased in MTC tissues and cell lines compared with normal tissues and cell lines. Patients with high miR‑592 expression levels exhibited a less favorable prognosis compared with patients with low miR‑592 expression. The results suggested that miR‑592 overexpression promoted TT and MZ‑CRC‑1 cell proliferation in vitro. In addition, miR‑592 negatively regulated cyclin‑dependent kinase 8 (CDK8) via targeted binding in MTC cells. Moreover, co‑transfection of CDK8 overexpression plasmid and miR‑592 mimic reversed miR‑592‑mediated MTC cell proliferation. In conclusion, miR‑592 may serve as an oncogene in MTC by decreasing the expression of CDK8, indicating that the miR‑592/CDK8 axis might serve as a promising therapeutic target for MTC.
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Affiliation(s)
- Ting Liu
- Department of Nuclear Medicine, The Affiliated Wuhan Central Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430014, P.R. China
| | - Jingjing Meng
- Department of Thyroid and Breast Surgery, The Affiliated Wuhan Central Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430014, P.R. China
| | - Yu Zhang
- Department of Surgery II, Shanghai Municipal Hospital of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200071, P.R. China
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Pan R, Zhou H. Exosomal Transfer of lncRNA H19 Promotes Erlotinib Resistance in Non-Small Cell Lung Cancer via miR-615-3p/ATG7 Axis. Cancer Manag Res 2020; 12:4283-4297. [PMID: 32606925 PMCID: PMC7294568 DOI: 10.2147/cmar.s241095] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 04/28/2020] [Indexed: 12/19/2022] Open
Abstract
Background Drug resistance restrains the effect of drug therapy in non-small cell lung cancer (NSCLC). However, the mechanism of the acquisition of drug resistance remains largely unknown. This study aims to investigate the effect of exosomal lncRNA H19 on erlotinib resistance in NSCLC and the underlying mechanism. Methods HCC827 and A549 cells were continuously grafted into erlotinib-containing culture medium to establish erlotinib-resistant cell lines. The expression of H19 and miR-615-3p was detected by qRT-PCR. The protein levels of MMP2, MMP9, CD9, CD63 and ATG7 were measured by Western blot. Cell viability and proliferation were determined by Cell Counting Kit-8 (CCK-8) and 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT) assay, respectively. Migration and invasion were assessed by transwell assay. Xenograft tumor models were used to investigate the effect of H19 on erlotinib resistance in vivo. Online software and dual-luciferase reporter assay were used to predicate the downstream targets and confirm the targeted relationships. Results H19 was upregulated in erlotinib-resistant cells, and knockdown of H19 inhibited cell proliferation, migration and invasion in erlotinib-resistant cells. Extracellular H19 can be packaged into exosomes. Exosomes containing H19 induced erlotinib resistance of sensitive cells, while knockdown of H19 abolished this effect. miR-615-3p was a target of H19 and can bind to ATG7. Exosomal H19 affected erlotinib resistance of erlotinib-resistant NSCLC cells via targeting miR-615-3p to regulate ATG7 expression. In addition, the serum exosomal H19 was upregulated in patients with erlotinib resistance. Furthermore, downregulated H19 decreased the resistance of tumor cells to erlotinib in vivo. Conclusion Our study demonstrated that exosomal H19 facilitated erlotinib resistance in NSCLC via miR-615-3p/ATG7 axis, which might provide a potential target for the diagnosis and treatment of NSCLC.
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Affiliation(s)
- Rongtao Pan
- Department of Oncology, Taishan Hospital of Shandong Province, Taian 271000, Shandong, People's Republic of China
| | - Haiyan Zhou
- Department of Medical Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan 250117, Shandong, People's Republic of China
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