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Tan F, Tang Y, He Z. Role of CCNB1, CENPF, and neutrophils in lung cancer diagnosis and prognosis. Medicine (Baltimore) 2023; 102:e35802. [PMID: 37986322 PMCID: PMC10659645 DOI: 10.1097/md.0000000000035802] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 08/11/2023] [Accepted: 10/04/2023] [Indexed: 11/22/2023] Open
Abstract
This study aimed to investigate CCNB1, CENPF, and Neutrophils as diagnostic predictors of lung cancer and to explore their association with clinical prognosis. Clinical data were obtained for a total of 52 patients. In addition, we downloaded 555 lung cancer-related samples from the cancer genome atlas (TCGA) database. Differentially expressed genes were further screened. Immune cell infiltration and survival analysis were performed. Immunohistochemistry was used to confirm gene expression. Peripheral blood analysis showed that neutrophil percentages were significantly reduced in patients with lung cancer. The least absolute shrinkage and selection operator and multivariate regression analysis revealed that CCNB1 and CENPF were lung cancer risk factors. Both CCNB1 and CENPF are overexpressed in lung cancer. The clinical diagnostic model constructed using CCNB1, CENPF, and neutrophils had a C-index of 0.994. This model area under the curve (AUC) and internal validation C-index values were 0.994 and 0.993, respectively. The elevated expression of CCNB1 and CENPF showed that the survival rate of lung cancer patients was reduced. CCNB1 and CENPF expression was positively correlated with the clinical stage of lung cancer. Further studies confirmed that CCNB1 and CENPF are overexpressed in lung cancer tissues. The clinically constructed model with high accuracy based on CCNB1, CENPF, and neutrophils demonstrated that these are crucial indicators for lung cancer diagnosis. High expression of CCNB1 and CENPF indicates a poor prognosis in patients with lung cancer.
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Affiliation(s)
- Feixiang Tan
- Department of Respiratory Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Yonglian Tang
- Department of blood transfusion, Guangxi Medical University Affiliated Tumor Hospital, Nanning, Guangxi, China
| | - Zhiyi He
- Department of Respiratory Medicine, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
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Zhou S, Cao C, Hu J. Long Non-Coding RNA Small Nucleolar RNA Host Gene 4 Induced by Transcription Factor SP1 Promoted the Progression of Nasopharyngeal Carcinoma Through Modulating microRNA-510-5p/Centromere Protein F Axis. Biochem Genet 2023; 61:1967-1986. [PMID: 36899270 DOI: 10.1007/s10528-023-10351-7] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 02/15/2023] [Indexed: 03/12/2023]
Abstract
Long non-coding RNAs (LncRNAs) are implicated with tumorigenesis and the development of nasopharyngeal carcinoma (NPC). Previous studies suggested that long non-coding RNA small nucleolar RNA host gene 4 (SNHG4) exerted oncogenic roles in various cancers. However, the function and molecular mechanism of SNHG4 in NPC have not been investigated. In our study, it was confirmed that the SNHG4 level was enriched in NPC tissues and cells. Functional assays indicated that SNHG4 depletion inhibited the proliferation and metastasis but promoted apoptosis of NPC cells. Furthermore, we identified miR-510-5p as a downstream gene of SNHG4 in NPC cells and SNHG4 upregulated CENPF expression by binding to miR-510-5p. Moreover, there was a positive (or negative) association between CENPF and SNHG4 (or miR-510-5p) expression in NPC. In addition, rescue experiments verified that CENPF overexpression or miR-510-5p silencing abrogated inhibitory effects on NPC tumorigenesis caused by SNHG4 deficiency. The study demonstrated that SNHG4 promoted NPC progression via miR-510-5p/CENPF axis, providing a novel potential therapeutic target for NPC treatments.
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Affiliation(s)
- Shao Zhou
- Department of Otorhinolaryngology, The Affiliated People's Hospital of Ningbo University, No. 251 East Baizhang Road, Ningbo, 315000, Zhejiang, China.
| | - Cheng Cao
- Department of Otorhinolaryngology, The Affiliated People's Hospital of Ningbo University, No. 251 East Baizhang Road, Ningbo, 315000, Zhejiang, China
| | - Jiandao Hu
- Department of Otorhinolaryngology, The Affiliated People's Hospital of Ningbo University, No. 251 East Baizhang Road, Ningbo, 315000, Zhejiang, China
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Chen Y, Zhang Y. CircDLG1 promotes malignant development of non-small cell lung cancer through regulation of the miR-630/CENPF axis. Strahlenther Onkol 2023; 199:169-181. [PMID: 35748916 DOI: 10.1007/s00066-022-01965-8] [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: 01/18/2022] [Accepted: 05/22/2022] [Indexed: 01/28/2023]
Abstract
BACKGROUND Circular RNAs (circRNAs) have been reported to be crucial modulatory molecules in the etiology of non-small cell lung cancer (NSCLC). This study aimed to probe the precise role and mechanism of circRNA discs large MAGUK scaffold protein 1 (circDLG1) in the malignant progression of NSCLC. METHODS The abundances of circDLG1, miR-630, and centromere protein F (CENPF) mRNAs were gauged by quantitative real-time polymerase chain reaction (qRT-PCR). Cell proliferation was tested in 3‑(4, 5‑dimethylthiazol-2-yl)-2, 5‑diphenyltetrazolium bromide (MTT) assay and 5‑ethynyl-2'-deoxyuridine (EdU)-incorporation assay. Cell apoptosis was analyzed by flow cytometry. Cell migration and invasion were assessed by transwell assay. Western blot was exploited to examine the levels of all proteins. The interaction between miR-630 and circDLG1 or CENPF was verified by dual-luciferase reporter, RNA pull-down, and/or RNA immunoprecipitation assays. Tumor xenograft assay and immunohistochemistry (IHC) were executed for the role of circDLG1 in tumor growth in vivo. RESULTS CircDLG1 and CENPF were highly expressed in NSCLC, while miR-630 was downregulated. CircDLG1 silencing repressed proliferation, migration, and invasion, and expedited apoptosis of NSCLC cells in vitro. Mechanistically, circDLG1 deficiency modulated NSCLC cell malignant development through interacting with miR-630. Furthermore, CENPF was targeted by miR-630, and circDLG1 could positively control CENPF expression through acting as an miR-630 sponge. Furthermore, CENPF overexpression reversed the repressive impacts of circDLG1 inhibition in the malignant behaviors of NSCLC cells. Besides, circDLG1 interference hindered tumor growth in vivo. CONCLUSION CircDLG1 knockdown could impede NSCLC advancement through modulating the miR-630/CENPF axis, manifesting as a promising molecular target for NSCLC treatment.
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Affiliation(s)
- Yingying Chen
- Department of Pulmonary and Critical Care Medicine, Shengjing Hospital of China Medical University, Shenyang, Liaoning Province, China
| | - Ying Zhang
- Department of Clinical Oncology, Shengjing Hospital of China Medical University, No. 39 Huaxiang Road, 110022, Tiexi District, Shenyang, Liaoning Province, China.
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Chen H, Wu F, Xu H, Wei G, Ding M, Xu F, Deivasigamani A, Zhou G, Hui KM, Xia H. Centromere protein F promotes progression of hepatocellular carcinoma through ERK and cell cycle-associated pathways. Cancer Gene Ther 2022; 29:1033-42. [PMID: 34857915 DOI: 10.1038/s41417-021-00404-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 08/17/2021] [Accepted: 10/26/2021] [Indexed: 11/08/2022]
Abstract
Hepatocellular carcinoma (HCC) is one of the deadliest cancer types worldwide. The centromere proteins (CENPs) are critical for the mitosis-related protein complex and are involved in kinetochore assembly and spindle checkpoint signaling during mitosis. However, the clinical significance of CENPs in the recurrence and progression of HCC remains poorly understood. Here, we examined the expression of all CENPs and their association with recurrence and survival of HCC patients using the global gene expression profile dataset established in our laboratory. The effect of silencing CENPF on cell viability, migration, and epithelial-mesenchymal transition (EMT) were detected using CCK-8, transwell, and western blot, respectively. RT-qPCR and western blot were performed to confirm the silencing of CENPF and the relationship between STAT5A and CENPF, while tumorigenesis was tested using the HCC Huh7 xenograft mouse model. Most of the CENPs is overexpressed in HCC, and overexpression of CENPF was significantly associated with the poor survival of HCC patients. CENPF promoted HCC cell lines migration and EMT progression. Knockdown CENPF inhibited cell growth activity against human HCC cells in vitro and xenograft tumors in vivo. Bioinformatics analysis revealed that CENPF genes are enriched in the cell cycle. Silencing CENPF arrested cell cycle at the G2/M phase and inhibited Cyclin B1 and Cyclin E1 expressions. Meanwhile, silencing CENPF prohibited phosphorylation of ERK and the expression of NEK2. Additionally, we found that STAT5A down-regulated CENPF expression and inhibited cancer cell growth viability. In conclusion, our data suggested that CENPF could be potentially developed into a theranostic biomarker to tackle HCC progression.
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Nie J, Gong L, Li Z, Ou D, Zhang L, Liu Y, Zhang J, Liu D. Bioinformatics Analysis of mRNAs and miRNAs for Identifying Potential Biomarkers in Lung Adenosquamous Carcinoma. Comput Math Methods Med 2022; 2022:5851269. [PMID: 35281953 PMCID: PMC8906974 DOI: 10.1155/2022/5851269] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 01/19/2022] [Accepted: 01/22/2022] [Indexed: 12/25/2022]
Abstract
Background Lung adenosquamous carcinoma (LASC) is a special type of lung cancer. LASC is a malignant tumor with strong aggressiveness and a poor prognosis. Previous studies have revealed that microRNAs (miRNAs) are widely involved in the development of tumors by targeting mRNA. This study is aimed at identifying the key mRNAs and miRNAs of LASC and constructing miRNA-mRNA networks for deeply comprehending the latent molecular mechanisms. Methods mRNA dataset (GSE51852) and miRNA dataset (GSE51853) were extracted and downloaded from the Gene Expression Omnibus (GEO) database. Differentially expressed genes (DEGs) and differentially expressed miRNAs (DEMs) were picked out by the GEO2R web tool. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) functional enrichment analyses were conducted in the DAVID database. The protein-protein interaction (PPI) network was performed and analyzed by using the STRING database and Cytoscape software, respectively. TransmiR v2.0 was applied to predict potential transcription factors of miRNAs. The target genes of DEMs were predicted in the miRWalk database. Results In comparison to normal tissues, a total of 1458 DEGs (511 upregulated and 947 downregulated) and 13 DEMs (5 upregulated and 8 downregulated) were screened out in LASC tissues. The PPI network of the DEGs displayed five key modules and seventeen hub genes. Six target genes of the DEMs were predicted, and five essential miRNA-mRNA regulatory pairs were established. Ensuingly, CENPF, one of the target genes, was also the hub genes of GSE51852, which was obtained from MCODE and cytoHubba and regulated by hsa-miR-205. Conclusions We constructed the miRNA-mRNA regulatory pairs, which are helpful to study the potential regulatory mechanisms and find out promising diagnosis biomarkers and therapeutic targets for LASC.
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Affiliation(s)
- Jin Nie
- The Second Department of Respiratory and Critical Care Medicine, Affiliated Hospital of Zunyi Medical University, Zunyi, 563000, China
| | - Ling Gong
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People Hospital of Zunyi), Zunyi, 563000, China
| | - Zhu Li
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People Hospital of Zunyi), Zunyi, 563000, China
| | - Dong Ou
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People Hospital of Zunyi), Zunyi, 563000, China
| | - Ling Zhang
- Department of Respiratory Medicine, The Third Affiliated Hospital of Zunyi Medical University (The First People Hospital of Zunyi), Zunyi, 563000, China
| | - Yi Liu
- Zunyi Medical University, Zunyi, 563000, China
| | - Jianyong Zhang
- The Second Department of Respiratory and Critical Care Medicine, Affiliated Hospital of Zunyi Medical University, Zunyi, 563000, China
| | - Daishun Liu
- Zunyi Medical University, Zunyi, 563000, China
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Abstract
Centromere protein F (CENPF) plays a key role in the regulation of the cell cycle. The present study revealed that CENPF was overexpressed in a variety of tumors and associated with the poor prognosis of osteosarcoma. The mRNA expression levels of CENPF were analyzed using the Gene Expression Profiling Interactive Analysis database and the protein levels of CENPF were detected in the specimens from patients with osteosarcoma using immunohistochemistry. Cell proliferation, cell cycle and flow cytometry assays were performed after the transfection of control or CENPF plasmids into osteosarcoma cells. A xenografts assay was used to determine the effects of CENPF on tumor growth in vivo. The results showed that CENPF was upregulated in osteosarcoma tissues and associated with high-grade tumor stage (P=0.023) and intraglandular dissemination (P=0.046). The transfection-induced depletion of CENPF in human osteosarcoma MG-63 and U-2 OS cell lines inhibited cell proliferation, stimulated apoptosis and induced cell cycle arrest. Induced CENPF depletion in MG-63 cells inhibited tumor growth of osteosarcoma cells in mice. These findings suggested that elevated CENPF levels contributed to increased cell proliferation by mediating apoptosis and cell cycle in osteosarcoma. Therefore, CENPF might be a potential biomarker for poor prognosis of osteosarcoma.
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Affiliation(s)
- Ping-An Zou
- Department of Bone and Soft Tissue Oncology, Jiangxi Cancer Hospital, Nanchang, Jiangxi 330029, P.R. China
| | - Zheng-Xu Yang
- Department of Bone and Soft Tissue Oncology, Jiangxi Cancer Hospital, Nanchang, Jiangxi 330029, P.R. China
| | - Xi Wang
- Department of Bone and Soft Tissue Oncology, Jiangxi Cancer Hospital, Nanchang, Jiangxi 330029, P.R. China
| | - Zhi-Wei Tao
- Department of Bone and Soft Tissue Oncology, Jiangxi Cancer Hospital, Nanchang, Jiangxi 330029, P.R. China
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Han Y, Xu S, Cheng K, Diao C, Liu S, Zou W, Bi Y. CENPF promotes papillary thyroid cancer progression by mediating cell proliferation and apoptosis. Exp Ther Med 2021; 21:401. [PMID: 33680123 PMCID: PMC7918471 DOI: 10.3892/etm.2021.9832] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [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: 02/21/2020] [Accepted: 08/26/2020] [Indexed: 12/23/2022] Open
Abstract
Papillary thyroid cancer (PTHCA) accounts for ~85% cases of thyroid cancer and exhibits high incidence. Targeted therapy is an effective method to combat this disease; however, novel therapeutic targets are required. Centromere protein F (CENPF), a member of centromere proteins and a transient kinetochore protein, regulates various cellular processes such as cell migration and mitosis, and its upregulation has been observed in multiple types of cancer, including breast cancer and gastric cancer. However, the potential role of CENPF in PTHCA progression is remains unclear. The results of the current study demonstrated that CENPF expression was enhanced in human PTHCA tissues through IHC assays. Furthermore, the expression of CENPF was correlated with the prognosis and the clinicopathological features, including T stage (P=0.021) and intraglandular dissemination (P=0.042) in patients with PTHCA. CENPF regulated the proliferation, apoptosis and cell cycle of PTHCA cells in vitro, which was confirmed through colony formation, MTT and flow cytometry assays, and affected tumor growth in vivo in mice. In conclusion, the current study reported the involvement of CENPF in PTHCA progression and provided a promising therapeutic target for PTHCA treatment.
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Affiliation(s)
- Yong Han
- Department of Breast and Thyroid Surgery, Binzhou Medical University Hospital, Binzhou, Shandong 256603, P.R. China
| | - Shujian Xu
- Department of Breast and Thyroid Surgery, Binzhou Medical University Hospital, Binzhou, Shandong 256603, P.R. China
| | - Kai Cheng
- Department of Breast and Thyroid Surgery, Binzhou Medical University Hospital, Binzhou, Shandong 256603, P.R. China
| | - Caimei Diao
- Department of Health Management, The People's Hospital of South District of Qingdao, Qingdao, Shandong 266000, P.R. China
| | - Song Liu
- Department of Breast and Thyroid Surgery, Binzhou Medical University Hospital, Binzhou, Shandong 256603, P.R. China
| | - Weiwei Zou
- Department of Breast and Thyroid Surgery, Binzhou Medical University Hospital, Binzhou, Shandong 256603, P.R. China
| | - Yueyang Bi
- Department of Respiratory Medicine, Binzhou Medical University Hospital, Binzhou, Shandong 256603, P.R. China
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Wang F, Li X, Jia X, Geng L. CircRNA ZNF609 Knockdown Represses the Development of Non-Small Cell Lung Cancer via miR-623/FOXM1 Axis. Cancer Manag Res 2021; 13:1029-1039. [PMID: 33574702 PMCID: PMC7871177 DOI: 10.2147/cmar.s282162] [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: 09/15/2020] [Accepted: 11/07/2020] [Indexed: 12/16/2022] Open
Abstract
Background The dysregulated circular RNAs (circRNAs) are relevant to the development of non-small cell lung cancer (NSCLC). Nevertheless, the function and mechanism of circRNA zinc finger protein 609 (circZNF609) in NSCLC development remain uncertain. Methods Sixty-two NSCLC patients were recruited. circZNF609, microRNA-623 (miR-623) and forkhead box M1 (FOXM1) abundances were measured via quantitative reverse transcription polymerase chain reaction or Western blot. Cell viability, apoptosis, migration and invasion were analyzed via cell counting kit-8 (CCK8), flow cytometry, caspase3 activity, transwell assay and Western blot. The interaction between miR-623 and circZNF609 or FOXM1 was analyzed via dual-luciferase reporter analysis, RNA immunoprecipitation and pull-down. The function of circZNF609 on cell growth in vivo was tested via xenograft model. Results circZNF609 abundance was enhanced in NSCLC tissues and cells. High expression of circZNF609 indicated the lower overall survival. circZNF609 interference restrained cell viability, migration and invasion and increased apoptosis. miR-623 was targeted via circZNF609. FOXM1 was targeted via miR-623 and regulated via circZNF609. miR-623 knockdown or FOXM1 overexpression mitigated the role of circZNF609 silence in NSCLC development. circZNF609 knockdown decreased NSCLC xenograft tumor growth. Conclusion circZNF609 knockdown repressed NSCLC development via regulating miR-623 and FOXM1.
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Affiliation(s)
- Fanghan Wang
- Department of Oncology, 4th People's Hospital of Zibo, Zibo, Shandong, 255000, People's Republic of China
| | - Xiangfeng Li
- Department of Radiology, 4th People's Hospital of Zibo, Zibo, Shandong, 255000, People's Republic of China
| | - Xigao Jia
- Department of Medicine, 4th People's Hospital of Zibo, Zibo, Shandong, 255000, People's Republic of China
| | - Luxin Geng
- Department of Oncology, 4th People's Hospital of Zibo, Zibo, Shandong, 255000, People's Republic of China
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Li MX, Zhang MY, Dong HH, Li AJ, Teng HF, Liu AL, Xu N, Qu YQ. Overexpression of CENPF is associated with progression and poor prognosis of lung adenocarcinoma. Int J Med Sci 2021; 18:494-504. [PMID: 33390818 PMCID: PMC7757141 DOI: 10.7150/ijms.49041] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 11/13/2020] [Indexed: 12/20/2022] Open
Abstract
Background and aim: The molecular signatures of lung adenocarcinoma (LUAD) are not well understood. Centromere protein F (CENPF) has been shown to promote oncogenesis in many cancers; however, its role in LUAD has not been illustrated. We explored the role of CENPF in LUAD. Methods: CENPF expression level was investigated in public online database firstly, the prognosis of CENPF in LUAD were also assessed by Kaplan-Meier analysis. Then quantitative reverse transcription-polymerase chain reaction (qRT-PCR) was performed using 13 matched pairs of clinical LUAD tissue samples. Subsequently, the impact of CENPF expression on cell proliferation, cell cycle, apoptosis, colony formation was investigated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT), flow cytometric analysis and colony formation assay, respectively. Finally, experimental xenograft lung cancer model of nude mice armpit of right forelimb to determine the effect of CENPF on LUAD tumorigenesis. Results: CENPF mRNA expression was significantly elevated in LUAD tissues compared with adjacent non-tumor lung tissues in Gene Expression Profiling Interactive Analysis (GEPIA) (P < 0.001). Up-regulated CENPF was remarkably positively associated with pathological stage, relapse free survival (RFS) as well as overall survival (OS) of LUAD patients. Besides, CENPF knockdown greatly suppressed A549 cell proliferation, induced S phase arrest, promoted apoptosis and decreased colony numbers of LUAD cells. Furthermore, knockdown of CENPF significantly inhibited the tumor growth of the LUAD cells in an experimental xenograft lung cancer model of nude mice armpit of right forelimb. Conclusion: Taken together, these results demonstrated that CENPF may serve as a potential biomarker of prognostic relevance and a potential therapeutic target for LUAD.
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Affiliation(s)
- Mei-Xiang Li
- Department of Pulmonary and Critical Care Medicine, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250012, China.,Department of Respiratory Medicine, Weihai Municipal Hospital, Weihai 264200, China
| | - Meng-Yu Zhang
- Department of Pulmonary and Critical Care Medicine, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250012, China
| | - Huan-Huan Dong
- Department of Pathology, Weihai Municipal Hospital, Weihai 264200, China
| | - Ai-Jun Li
- Department of Respiratory Medicine, Weihai Municipal Hospital, Weihai 264200, China
| | - Hai-Feng Teng
- Department of Respiratory Medicine, Weihai Municipal Hospital, Weihai 264200, China
| | - Ai-Ling Liu
- Department of Respiratory Medicine, Weihai Municipal Hospital, Weihai 264200, China
| | - Ning Xu
- Department of Respiratory Medicine, Weihai Municipal Hospital, Weihai 264200, China
| | - Yi-Qing Qu
- Department of Pulmonary and Critical Care Medicine, Qilu Hospital of Shandong University, Jinan 250012, China
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