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Datta N, Vp S, Parvathy K, A S S, Maliekal TT. ALDH1A1 as a marker for metastasis initiating cells: A mechanistic insight. Exp Cell Res 2024; 442:114213. [PMID: 39173941 DOI: 10.1016/j.yexcr.2024.114213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2024] [Revised: 08/12/2024] [Accepted: 08/14/2024] [Indexed: 08/24/2024]
Abstract
Since metastasis accounts for the majority of cancer morbidity and mortality, attempts are focused to block metastasis and metastasis initiating cellular programs. It is generally believed that hypoxia, reactive oxygen species (ROS) and the dysregulated redox pathways regulate metastasis. Although induction of epithelial to mesenchymal transition (EMT) can initiate cell motility to different sites other than the primary site, the initiation of a secondary tumor at a distant site depends on self-renewal property of cancer stem cell (CSC) property. That subset of metastatic cells possessing CSC property are referred to as metastasis initiating cells (MICs). Among the different cellular intermediates regulating metastasis in response to hypoxia by inducing EMT and self-renewal property, ALDH1A1 is a critical molecule, which can be used as a marker for MICs in a wide variety of malignancies. The cytosolic ALDHs can irreversibly convert retinal to retinoic acid (RA), which initiates RA signaling, important for self-renewal and EMT. The metastasis permissive tumor microenvironment increases the expression of ALDH1A1, primarily through HIF1α, and leads to metabolic reprograming through OXPHOS regulation. The ALDH1A1 expression and its high activity can reprogram the cancer cells with the transcriptional upregulation of several genes, involved in EMT through RA signaling to manifest hybrid EMT or Hybrid E/M phenotype, which is important for acquiring the characteristics of MICs. Thus, the review on this topic highlights the use of ALDH1A1 as a marker for MICs, and reporters for the marker can be effectively used to trace the population in mouse models, and to screen drugs that target MICs.
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Affiliation(s)
- Nandini Datta
- Cancer Research, Rajiv Gandhi Centre for Biotechnology (BRIC-RGCB), Thiruvananthapuram, Kerala, 695014, India
| | - Snijesh Vp
- Division of Molecular Medicine, St. John's Research Institute, St John's National Academy of Health Sciences, Bangalore, 560034, India
| | - K Parvathy
- Cancer Research, Rajiv Gandhi Centre for Biotechnology (BRIC-RGCB), Thiruvananthapuram, Kerala, 695014, India
| | - Sneha A S
- Cancer Research, Rajiv Gandhi Centre for Biotechnology (BRIC-RGCB), Thiruvananthapuram, Kerala, 695014, India
| | - Tessy Thomas Maliekal
- Cancer Research, Rajiv Gandhi Centre for Biotechnology (BRIC-RGCB), Thiruvananthapuram, Kerala, 695014, India; Regional Centre for Biotechnology, Faridabad, Haryana 121001, India.
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Jing LP, Li M, Xia XY, Zheng X, Chen JY, He J, Zhuang XW. SIAH2 is specifically expressed during cervical carcinogenesis, and closely relates to the abnormal proliferation of cervical epithelial cells. Heliyon 2024; 10:e31487. [PMID: 38828323 PMCID: PMC11140618 DOI: 10.1016/j.heliyon.2024.e31487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 05/16/2024] [Accepted: 05/16/2024] [Indexed: 06/05/2024] Open
Abstract
Background Cervical cancer is one of the most common malignancies in women worldwide. As a RING type ubiquitin ligase, SIAH2 has been reported to promote the progression of a variety of tumors by interacting with and targeting multiple chaperones and substrates. The aim of this study was to further identify the role and the related molecular mechanisms involved of SIAH2 in cervical carcinogenesis. Methods and results Cellular assays in vitro showed that knockdown of SIAH2 inhibited the proliferation, migration and invasion of human cervical cancer cells C33A and SiHa, induced apoptosis, and increased the sensitivity to cisplatin treatment. Knockdown of SIAH2 also inhibited the epithelial-mesenchymal transition and activation of the Akt/mTOR signaling pathway in cervical cancer cells, which were detected by Western blot. Mechanistically, SIAH2, as a ubiquitin ligase, induced the ubiquitination degradation of GSK3β degradation by using coIP. The results of complementation experiments further demonstrated that GSK3β overexpression rescued the increase of cell proliferation and invasion caused by SIAH2 overexpression. Specific expression of SIAH2 appeared in precancerous and cervical cancer tissues compared to inflammatory cervical lesions tissues using immunohistochemical staining. The more SIAH2 was expressed as the degree of cancer progressed. SIAH2 was significantly highly expressed in cervical cancer tissues (44/55, 80 %) compared with precancerous tissues (18/69, 26.1 %). Moreover, the expression level of SIAH2 in cervical cancer tissues was significantly correlated with the degree of cancer differentiation, and cervical cancer tissues with higher SIAH2 expression levels were less differentiated. Conclusion Targeting SIAH2 may be beneficial to the treatment of cervical cancer.
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Affiliation(s)
- Li-ping Jing
- Clinical Laboratory Department, Liaoning Cancer Hospital & Institute, 110042, Shenyang, Liaoning, China
| | - Meng Li
- Department of Laboratory, Shandong Provincial Third Hospital, Shandong University, 250031, Jinan, Shandong, China
| | - Xi-yan Xia
- Department of Immunology Teaching and Research, Jinan Vocational College of Nursing, 250102, Jinan, Shandong, China
| | - Xin Zheng
- Department of Laboratory, Shandong Provincial Third Hospital, Shandong University, 250031, Jinan, Shandong, China
| | - Jia-yu Chen
- Department of Laboratory, Shandong Provincial Third Hospital, Shandong University, 250031, Jinan, Shandong, China
| | - Jing He
- Second Clinical Medical College, Shandong University of Traditional Chinese Medicine, 250014, Jinan, Shandong, China
| | - Xue-wei Zhuang
- Department of Laboratory, Shandong Provincial Third Hospital, Shandong University, 250031, Jinan, Shandong, China
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Zhou W, Wang J, Tian F, Liu P, Li M, Song C, Zhang Y, Yang X, Nie X, Shi Y. High PLK3 levels are linked with less tumor invasion, lower FIGO stage and better prognosis of endometrial cancer. Biomark Med 2024; 18:523-533. [PMID: 39082977 PMCID: PMC11364079 DOI: 10.1080/17520363.2024.2347192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Accepted: 04/03/2024] [Indexed: 08/30/2024] Open
Abstract
Aim: To evaluate correlations of tumor PLK3 with clinical features and prognosis of resectable endometrial cancer (EC) patients.Methods: Tumor tissues from 200 EC patients receiving surgical resections and adjacent tissues from 50 of them were collected for PLK3 determination using immunohistochemistry.Results: Tumor PLK3 negatively linked with myometrial invasion ≥50%, lymphovascular invasion, stromal cervical invasion, and International Federation of Gynecology and Obstetrics stage (all p < 0.050). High tumor PLK3 independently related to longer disease-free survival (DFS) (p = 0.044) and overall survival (OS) (p = 0.049). Its prognostic value was also validated by time-dependent receiver operating characteristic analyses (area under curve at most timepoints was >0.700).Conclusion: Tumor PLK3 potentially reflects prolonged DFS and OS in EC patients undergoing surgical resections.
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Affiliation(s)
- Weiyue Zhou
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
| | - Jurong Wang
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
| | - Fen Tian
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
| | - Ping Liu
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
| | - Meiyan Li
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
| | - Chunli Song
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
| | - Yixin Zhang
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
| | - Xiaoming Yang
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
| | - Xiaohuan Nie
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
| | - Yuanyuan Shi
- Department of Gynecology, HanDan Central Hospital, Handan, 056000, China
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Zeng H, Wang Q, Xiang Y, Yang Y, Tu X, He H, Li S, Zhang W. PLK3 is linked with higher tumor stage and unfavorable prognosis in patients with colorectal cancer. Biomark Med 2024; 18:221-230. [PMID: 38629862 PMCID: PMC11216246 DOI: 10.2217/bmm-2023-0591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 02/27/2024] [Indexed: 06/26/2024] Open
Abstract
Objective: This study intended to explore the relationship of PLK3 with prognosis in patients with colorectal cancer (CRC). Methods: PLK3 positivity was detected by immunohistochemistry in 160 patients with CRC receiving surgical resection. Results: The median tumor PLK3-positive rate was 26.5%. Tumor PLK3-positive rate was related to increased lymph node stage (p = 0.002) and tumor-node-metastasis stage (p < 0.001) of CRC. Tumor PLK3-positive rate ≥30% was related to shortened disease-free survival (p = 0.009) and overall survival (p = 0.003); tumor PLK3-positive rate ≥50% showed a stronger correlation with them (both p = 0.001), which was validated by multivariate Cox regression analyses (both p < 0.05). Conclusion: Tumor PLK3-positive rate ≥50% relates to increased tumor stage and unfavorable survival in patients with CRC.
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Affiliation(s)
- Hai Zeng
- Department of Oncology, First Affiliated Hospital of Yangtze University, Jingzhou, 434000, Hubei, China
| | - Qian Wang
- Department of Oncology, First Affiliated Hospital of Yangtze University, Jingzhou, 434000, Hubei, China
| | - Ying Xiang
- Laboratory of Oncology, Center for Molecular Medicine, School of Basic Medicine, Health Science Center, Yangtze University, Jingzhou, 434000, Hubei, China
| | - Yameng Yang
- Department of Oncology, First Affiliated Hospital of Yangtze University, Jingzhou, 434000, Hubei, China
| | - Xia Tu
- Department of Oncology, First Affiliated Hospital of Yangtze University, Jingzhou, 434000, Hubei, China
| | - Hui He
- Department of Oncology, First Affiliated Hospital of Yangtze University, Jingzhou, 434000, Hubei, China
| | - Shuang Li
- Department of Oncology, First Affiliated Hospital of Yangtze University, Jingzhou, 434000, Hubei, China
| | - Weijia Zhang
- Department of Oncology, First Affiliated Hospital of Yangtze University, Jingzhou, 434000, Hubei, China
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Xu M, Deng X, Xiang N, Zhang Z, Yang M, Liu Q. Plk3 Enhances Cisplatin Sensitivity of Nonsmall-Cell Lung Cancer Cells through Inhibition of the PI3K/AKT Pathway via Stabilizing PTEN. ACS OMEGA 2024; 9:8995-9002. [PMID: 38434880 PMCID: PMC10905570 DOI: 10.1021/acsomega.3c07271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 01/05/2024] [Accepted: 01/26/2024] [Indexed: 03/05/2024]
Abstract
Polo-like kinase 3 (Plk3) is involved in tumor development with a tumor suppressive function. However, the effect of Plk3 on the chemoresistance remains unclear. It has been documented that activation of the PI3K/AKT signaling pathway by PTEN loss significantly enhances chemoresistance in nonsmall-cell lung cancer (NSCLC). This study aims to evaluate the PTEN regulation by Plk3 and identify targets and underlying mechanisms that could be used to relieve chemoresistance. Our results showed that silencing Plk3 reduced PTEN expression and activated PI3K/AKT signaling by dephosphorylating and destabilizing PTEN in NSCLC cells. Reducing Plk3 expression promoted drug resistance to cisplatin (DDP), while overexpressing Plk3 promoted DDP sensitivity. However, these effects were attenuated when MK2206, a PI3K/AKT inhibitor, was applied. In conclusion, upregulation of Plk3 sensitized NSCLC cells toward DDP, which provides a potential target to restore DDP chemoresponse. We provided novel evidence that the PTEN/PI3K/AKT signaling pathway could be regulated by Plk3 through phosphorylation of PTEN and highlighted the critical role of Plk3 in the DDP resistance of NSCLC.
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Affiliation(s)
- Mengshan Xu
- Breast
Tumor Center, Hainan Provincial Tumor Hospital, Haikou 570312, Hainan, China
| | - Xiaoyun Deng
- Department
of Medical Oncology, Hainan Provincial Tumor
Hospital, Haikou 570312, Hainan, China
| | - Nana Xiang
- Department
of Medical Oncology, Luoyang Central Hospital, Luoyang 471001, Henan, China
| | - Zhao Zhang
- Breast
Tumor Center, Hainan Provincial Tumor Hospital, Haikou 570312, Hainan, China
| | - Min Yang
- Department
of Medical Oncology, Hainan Provincial Tumor
Hospital, Haikou 570312, Hainan, China
| | - Qinxiang Liu
- Department
of Medical Oncology, Hainan Provincial Tumor
Hospital, Haikou 570312, Hainan, China
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Frederick MI, Hovey OFJ, Kakadia JH, Shepherd TG, Li SSC, Heinemann IU. Proteomic and Phosphoproteomic Reprogramming in Epithelial Ovarian Cancer Metastasis. Mol Cell Proteomics 2023; 22:100660. [PMID: 37820923 PMCID: PMC10652129 DOI: 10.1016/j.mcpro.2023.100660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 09/30/2023] [Accepted: 10/05/2023] [Indexed: 10/13/2023] Open
Abstract
Epithelial ovarian cancer (EOC) is a high-risk cancer presenting with heterogeneous tumors. The high incidence of EOC metastasis from primary tumors to nearby tissues and organs is a major driver of EOC lethality. We used cellular models of spheroid formation and readherence to investigate cellular signaling dynamics in each step toward EOC metastasis. In our system, adherent cells model primary tumors, spheroid formation represents the initiation of metastatic spread, and readherent spheroid cells represent secondary tumors. Proteomic and phosphoproteomic analyses show that spheroid cells are hypoxic and show markers for cell cycle arrest. Aurora kinase B abundance and downstream substrate phosphorylation are significantly reduced in spheroids and readherent cells, explaining their cell cycle arrest phenotype. The proteome of readherent cells is most similar to spheroids, yet greater changes in the phosphoproteome show that spheroid cells stimulate Rho-associated kinase 1 (ROCK1)-mediated signaling, which controls cytoskeletal organization. In spheroids, we found significant phosphorylation of ROCK1 substrates that were reduced in both adherent and readherent cells. Application of the ROCK1-specific inhibitor Y-27632 to spheroids increased the rate of readherence and altered spheroid density. The data suggest ROCK1 inhibition increases EOC metastatic potential. We identified novel pathways controlled by Aurora kinase B and ROCK1 as major drivers of metastatic behavior in EOC cells. Our data show that phosphoproteomic reprogramming precedes proteomic changes that characterize spheroid readherence in EOC metastasis.
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Affiliation(s)
- Mallory I Frederick
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Owen F J Hovey
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Jenica H Kakadia
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Trevor G Shepherd
- Department of Obstetrics & Gynaecology, Western University, London, Ontario, Canada; London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada
| | - Shawn S C Li
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada.
| | - Ilka U Heinemann
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada.
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Zhu D, Zhang H, Li J, Qian X, Guo M, Jiang G, Gu Y. Liposome‐mediated biomimetic delivery of PLK3 inhibitor with NIR II‐triggered release prevents renal ischemia‐reperfusion injury. ADVANCED THERAPEUTICS 2022. [DOI: 10.1002/adtp.202200087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Dongdong Zhu
- Department of Nephrology Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 200092 PR China
| | - Hailing Zhang
- Department of Neurology Changhai Hospital Naval Medical University Shanghai 200433 PR China
| | - Junhui Li
- National Key Laboratory of Medical Immunology Institute of Immunology Naval Medical University Shanghai 200433 PR China
| | - Xiaoqian Qian
- Department of Nephrology Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 200092 PR China
| | - Meng Guo
- National Key Laboratory of Medical Immunology Institute of Immunology Naval Medical University Shanghai 200433 PR China
| | - Gengru Jiang
- Department of Nephrology Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 200092 PR China
| | - Yan Gu
- National Key Laboratory of Medical Immunology Institute of Immunology Naval Medical University Shanghai 200433 PR China
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Inhibition of PLK3 Attenuates Tubular Epithelial Cell Apoptosis after Renal Ischemia–Reperfusion Injury by Blocking the ATM/P53-Mediated DNA Damage Response. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:4201287. [PMID: 35783188 PMCID: PMC9249506 DOI: 10.1155/2022/4201287] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 03/18/2022] [Accepted: 05/03/2022] [Indexed: 11/17/2022]
Abstract
Objective Renal ischemia–reperfusion (I/R) injury is a major cause of acute kidney injury (AKI) in transplanted kidneys. This study was aimed at exploring the role of PLK3 (polo-like kinase 3) in renal I/R injury, focusing on its relationship with oxidative stress-induced DNA damage and renal tubular epithelial cell (TEC) apoptosis. Methods TRAP-seq data from the development dataset GSE52004 and the validation dataset GSE121191 were analyzed using GEO2R. PLK3 overexpression plasmids and targeted silencing siRNAs were used in a model of hypoxia/reoxygenation (H/R) injury, and rAAV-9-PLK3-KD were administered to C57BL/6J mice exposed to I/R injury. The ATM-specific inhibitor KU-60019 was used to block the DNA damage response (DDR). Western blotting was performed to measure DDR- and apoptosis-associated protein expression. Cell viability was measured by CCK-8 reagent, and apoptosis was examined by flow cytometry and TUNEL assay. Furthermore, the fluorescent probes H2DCFH-DA and DHE were used to measure ROS production in vitro. The MDA level and SOD activity were measured to assess oxidative stress in vivo. KIM-1 staining and Scr and BUN were used to evaluate kidney injury. Results The mRNA and protein levels of PLK3 were markedly increased in the H/R injury and I/R injury models. GO terms showed that PLK3 was mainly involved in oxidative stress and DNA damage after renal I/R injury. Overexpression of PLK3 decreased cell viability and increased apoptosis. In contrast, targeted silencing of PLK3 expression decreased the Bax/Bcl-2 ratio by decreasing P53 phosphorylation, thereby reducing TEC apoptosis. Furthermore, KU-60019 reduced PLK3 activation and DDR-induced apoptosis, while overexpression of PLK3 reversed the mitigating effect of KU-60019 on TEC apoptosis. Similarly, rAAV-9-PLK3 KD mice exhibited a lower rate of TEC apoptosis and milder renal damage after I/R injury. Conclusion We demonstrate for the first time that PLK3 is involved in oxidative stress-induced DNA damage and TEC apoptosis in renal I/R injury. Inhibition of PLK3 attenuates TEC apoptosis after I/R injury by blocking the ATM/P53-mediated DDR. Therefore, PLK3 may serve as a potential therapeutic target for ischemic AKI.
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Liu Y, Li YQ, Huang SH, Li YL, Xia JW, Jia JS, Wei F, Wang JH, Dai GQ, Wang YC, Li XY, Han LX, Zhang XL, Xiang XD, Zhao WT, Xiao D, Lin XL. Liver-specific over-expression of Cripto-1 in transgenic mice promotes hepatocyte proliferation and deregulated expression of hepatocarcinogenesis-related genes and signaling pathways. Aging (Albany NY) 2021; 13:21155-21190. [PMID: 34517344 PMCID: PMC8457585 DOI: 10.18632/aging.203402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 07/13/2021] [Indexed: 11/25/2022]
Abstract
In this study, we investigated the role of embryonic gene Cripto-1 (CR-1) in hepatocellular carcinoma (HCC) using hepatocyte-specific CR-1-overexpressing transgenic mice. The expression of truncated 1.7-kb CR-1 transcript (SF-CR-1) was significantly higher than the full-length 2.0-kb CR-1 transcript (FL-CR-1) in a majority of HCC tissues and cell lines. Moreover, CR-1 mRNA and protein levels were significantly higher in HCC tissues than adjacent normal liver tissues. Hepatocyte-specific over-expression of CR-1 in transgenic mice enhanced hepatocyte proliferation after 2/3 partial hepatectomy (2/3 PHx). CR-1 over-expression significantly increased in vivo xenograft tumor growth of HCC cells in nude mice and in vitro HCC cell proliferation, migration, and invasion. CR-1 over-expression in the transgenic mouse livers deregulated HCC-related signaling pathways such as AKT, Wnt/β-catenin, Stat3, MAPK/ERK, JNK, TGF-β and Notch, as well as expression of HCC-related genes such as CD5L, S100A8, S100A9, Timd4, Orm2, Orm3, PDK4, DMBT1, G0S2, Plk2, Plk3, Gsta1 and Gsta2. However, histological signs of precancerous lesions, hepatocyte dysplasia or HCC formation were not observed in the livers of 3-, 6- or 8-month-old hepatocyte-specific CR-1-overexpressing transgenic mice. These findings demonstrate that liver-specific CR-1 overexpression in transgenic mice deregulates signaling pathways and genes associated with HCC.
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Affiliation(s)
- Yu Liu
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
- Institute of Comparative Medicine and Laboratory Animal Center, Southern Medical University, Guangzhou 510515, China
| | - Yan-Qing Li
- Department of Hematology, Central Hospital of Xuhui District, Shanghai 200030, China
| | - Shi-Hao Huang
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
| | - Yong-Long Li
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
- Institute of Comparative Medicine and Laboratory Animal Center, Southern Medical University, Guangzhou 510515, China
| | - Jia-Wei Xia
- The Third People’s Hospital of Kunming (The Sixth Affiliated Hospital of Dali University), Kunming 650041, China
| | - Jun-Shuang Jia
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
| | - Fang Wei
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
| | - Jia-Hong Wang
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
| | - Guan-Qi Dai
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
| | - Yu-Cai Wang
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
| | - Xiao-Yan Li
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
- Institute of Comparative Medicine and Laboratory Animal Center, Southern Medical University, Guangzhou 510515, China
| | - Liu-Xin Han
- The Third People’s Hospital of Kunming (The Sixth Affiliated Hospital of Dali University), Kunming 650041, China
| | - Xiao-Ling Zhang
- Department of Physiology, Faculty of Basic Medical Sciences, Guilin Medical University, Guilin 541004, China
| | - Xu-Dong Xiang
- Department of Thoracic Surgery, The Third Affiliated Hospital of Kunming Medical University (Yunnan Cancer Hospital, Yunnan Cancer Center), Kunming 650118, China
| | - Wen-Tao Zhao
- Department of Gastrointestinal Oncology, The Third Affiliated Hospital of Kunming Medical University (Yunnan Cancer Hospital, Yunnan Cancer Center), Kunming 650118, China
| | - Dong Xiao
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
- Institute of Comparative Medicine and Laboratory Animal Center, Southern Medical University, Guangzhou 510515, China
| | - Xiao-Lin Lin
- Cancer Research Institute, School of Basic Medical Science, Southern Medical University, Guangzhou 510515, China
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Kressin M, Fietz D, Becker S, Strebhardt K. Modelling the Functions of Polo-Like Kinases in Mice and Their Applications as Cancer Targets with a Special Focus on Ovarian Cancer. Cells 2021; 10:1176. [PMID: 34065956 PMCID: PMC8151477 DOI: 10.3390/cells10051176] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 05/06/2021] [Accepted: 05/08/2021] [Indexed: 12/12/2022] Open
Abstract
Polo-like kinases (PLKs) belong to a five-membered family of highly conserved serine/threonine kinases (PLK1-5) that play differentiated and essential roles as key mitotic kinases and cell cycle regulators and with this in proliferation and cellular growth. Besides, evidence is accumulating for complex and vital non-mitotic functions of PLKs. Dysregulation of PLKs is widely associated with tumorigenesis and by this, PLKs have gained increasing significance as attractive targets in cancer with diagnostic, prognostic and therapeutic potential. PLK1 has proved to have strong clinical relevance as it was found to be over-expressed in different cancer types and linked to poor patient prognosis. Targeting the diverse functions of PLKs (tumor suppressor, oncogenic) are currently at the center of numerous investigations in particular with the inhibition of PLK1 and PLK4, respectively in multiple cancer trials. Functions of PLKs and the effects of their inhibition have been extensively studied in cancer cell culture models but information is rare on how these drugs affect benign tissues and organs. As a step further towards clinical application as cancer targets, mouse models therefore play a central role. Modelling PLK function in animal models, e.g., by gene disruption or by treatment with small molecule PLK inhibitors offers promising possibilities to unveil the biological significance of PLKs in cancer maintenance and progression and give important information on PLKs' applicability as cancer targets. In this review we aim at summarizing the approaches of modelling PLK function in mice so far with a special glimpse on the significance of PLKs in ovarian cancer and of orthotopic cancer models used in this fatal malignancy.
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Affiliation(s)
- Monika Kressin
- Institute for Veterinary Anatomy, Histology and Embryology, Justus Liebig University Giessen, 35392 Giessen, Germany;
| | - Daniela Fietz
- Institute for Veterinary Anatomy, Histology and Embryology, Justus Liebig University Giessen, 35392 Giessen, Germany;
| | - Sven Becker
- Department of Gynecology, Goethe-University, 60590 Frankfurt, Germany; (S.B.); (K.S.)
| | - Klaus Strebhardt
- Department of Gynecology, Goethe-University, 60590 Frankfurt, Germany; (S.B.); (K.S.)
- German Cancer Consortium (DKTK), German Cancer Research Center, Partner Site Frankfurt am Main, 60590 Frankfurt, Germany
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Zhang Z, Xing X, Guan P, Song S, You G, Xia C, Liu T. Recent progress in agents targeting polo-like kinases: Promising therapeutic strategies. Eur J Med Chem 2021; 217:113314. [PMID: 33765606 DOI: 10.1016/j.ejmech.2021.113314] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 02/13/2021] [Accepted: 02/15/2021] [Indexed: 12/12/2022]
Abstract
Polo-like kinases (PLKs) play important roles in regulating multiple aspects of cell cycle and cell proliferation. In many cancer types, PLK family members are often dysregulated, which can lead to uncontrolled cell proliferation and aberrant cell division and has been shown to associate with poor prognosis of cancers. The key roles of PLK kinases in cancers lead to an enhanced interest in them as promising targets for anticancer drug development. In consideration of PLK inhibitors and some other anticancer agents, such as BRD4, EEF2K and Aurora inhibitors, exert synergy effects in cancer cells, dual-targeting of PLK and other cancer-related targets is regarded as an rational and potent strategy to enhance the effectiveness of single-targeting therapy for cancer treatment. This review introduces the PLK family members at first and then focuses on the recent advances of single-target PLK inhibitors and summarizes the corresponding SARs of them. Moreover, we discuss the synergisms between PLK and other anti-tumor targets, and sum up the current dual-target agents based on them.
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Affiliation(s)
- Zheng Zhang
- Department of Medicinal Chemistry, School of Pharmacy, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, Shandong, 271016, PR China
| | - Xiaolan Xing
- Yangtze River Pharmaceutical Group Shanghai Haini Pharmaceutical Co., Ltd. Pudong, Shanghai, 201100, PR China
| | - Peng Guan
- Department of Pharmacy, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, PR China
| | - Shubin Song
- Department of Breast Surgery, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong, 250117, PR China
| | - Guirong You
- Department of Medicinal Chemistry, School of Pharmacy, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, Shandong, 271016, PR China
| | - Chengcai Xia
- Department of Medicinal Chemistry, School of Pharmacy, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, Shandong, 271016, PR China
| | - Tingting Liu
- Department of Medicinal Chemistry, School of Pharmacy, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, Shandong, 271016, PR China.
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Xu D, Li C. Regulation of the SIAH2-HIF-1 Axis by Protein Kinases and Its Implication in Cancer Therapy. Front Cell Dev Biol 2021; 9:646687. [PMID: 33842469 PMCID: PMC8027324 DOI: 10.3389/fcell.2021.646687] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Accepted: 03/08/2021] [Indexed: 12/16/2022] Open
Abstract
The cellular response to hypoxia is a key biological process that facilitates adaptation of cells to oxygen deprivation (hypoxia). This process is critical for cancer cells to adapt to the hypoxic tumor microenvironment resulting from rapid tumor growth. Hypoxia-inducible factor 1 (HIF-1) is a transcription factor and a master regulator of the cellular response to hypoxia. The activity of HIF-1 is dictated primarily by its alpha subunit (HIF-1α), whose level and/or activity are largely regulated by an oxygen-dependent and ubiquitin/proteasome-mediated process. Prolyl hydroxylases (PHDs) and the E3 ubiquitin ligase Von Hippel-Lindau factor (VHL) catalyze hydroxylation and subsequent ubiquitin-dependent degradation of HIF-1α by the proteasome. Seven in Absentia Homolog 2 (SIAH2), a RING finger-containing E3 ubiquitin ligase, stabilizes HIF-1α by targeting PHDs for ubiquitin-mediated degradation by the proteasome. This SIAH2-HIF-1 signaling axis is important for maintaining the level of HIF-1α under both normoxic and hypoxic conditions. A number of protein kinases have been shown to phosphorylate SIAH2, thereby regulating its stability, activity, or substrate binding. In this review, we will discuss the regulation of the SIAH2-HIF-1 axis via phosphorylation of SIAH2 by these kinases and the potential implication of this regulation in cancer biology and cancer therapy.
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Affiliation(s)
- Dazhong Xu
- Department of Pathology, Microbiology and Immunology, School of Medicine, New York Medical College, Valhalla, NY, United States
| | - Cen Li
- Department of Pathology, Microbiology and Immunology, School of Medicine, New York Medical College, Valhalla, NY, United States
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Zeng Y, Li N, Liu W, Zeng M, Cheng J, Huang J. Analyses of expressions and prognostic values of Polo-like kinases in non-small cell lung cancer. J Cancer Res Clin Oncol 2020; 146:2447-2460. [PMID: 32627077 DOI: 10.1007/s00432-020-03288-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 06/09/2020] [Indexed: 12/24/2022]
Abstract
BACKGROUND Despite great advances in its early diagnosis and treatment, lung cancer is still an intractable disease and the second leading cause of cancer-related deaths and morbidity in the world. The family of Polo-like kinases (PLKs) consists of five serine/threonine kinases, which have been reported to participate in various human diseases. However, the expression and prognostic value of each PLK in human lung cancer have not been fully understood. This study analyzed mRNA expression and prognostic value of different PLKs in human non-small cell lung cancer (NSCLC). METHODS First, mRNA expression of PLKs in patients with NSCLC from the Oncomine and the Gene Expression Profiling Interactive Analysis (GEPIA) database was investigated. Then, a Kaplan-Meier plotter was employed for survival analysis. The sequence alteration for PLKs was analyzed using The Cancer Genome Atlas (TCGA) and the cBioPortal database. Additionally, we analyzed the association among different PLKs using the LinkedOmics database. Finally, the enrichment analysis of PLKs was achieved using the DAVID database. RESULTS The mRNA expression levels of PLK1 and PLK4 were significantly overexpressed, while mRNA expression level of PLK3 was underexpressed in patients with NSCLC. mRNA expressions of PLK1 and PLK4 were significantly and positively related to the tumor stage of NSCLC. Increased expressions of PLK1, PLK4, and PLK5 and decreased expression of PLK2 were attributed to limited overall survival time in NSCLC. PLK1 was positively correlated with PLK4 via the LinkedOmics database. CONCLUSIONS PLKs are relevant targets for NSCLC treatment, especially PLK1 and PLK4.
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Affiliation(s)
- Yu Zeng
- Department of Respiration, The Second Affiliated Hospital of Guangdong Medical University, 12# Minyou Road, Xiashan, Zhanjiang, 524003, Guangdong, People's Republic of China
- Graduate School, Guangdong Medical University, 2# Wenming Eastern Road, Xiashan, Zhanjiang, 524023, Guangdong, People's Republic of China
| | - Nanhong Li
- Pathological Diagnosis and Research Center, Affiliated Hospital, Guangdong Medical University, 57# Renmin avenue South, Xiashan, Zhanjiang, 524000, Guangdong, People's Republic of China
- Department of Pathology, Guangdong Medical University, 2# Wenming Eastern Road, Xiashan, Zhanjiang, 524023, Guangdong, People's Republic of China
| | - Wang Liu
- Department of Respiration, The Second Affiliated Hospital of Guangdong Medical University, 12# Minyou Road, Xiashan, Zhanjiang, 524003, Guangdong, People's Republic of China
| | - Mingqing Zeng
- First Clinical School of Medicine, Guangdong Medical University, 2# Wenming Eastern Road, Xiashan, Zhanjiang, 524023, Guangdong, People's Republic of China
| | - Junfen Cheng
- Department of Respiration, The Second Affiliated Hospital of Guangdong Medical University, 12# Minyou Road, Xiashan, Zhanjiang, 524003, Guangdong, People's Republic of China.
| | - Jian Huang
- Pathological Diagnosis and Research Center, Affiliated Hospital, Guangdong Medical University, 57# Renmin avenue South, Xiashan, Zhanjiang, 524000, Guangdong, People's Republic of China.
- Department of Pathology, Guangdong Medical University, 2# Wenming Eastern Road, Xiashan, Zhanjiang, 524023, Guangdong, People's Republic of China.
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A review on kinases phosphorylating the carboxyl-terminal domain of RNA polymerase II-Biological functions and inhibitors. Bioorg Chem 2020; 104:104318. [PMID: 33142427 DOI: 10.1016/j.bioorg.2020.104318] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/18/2020] [Accepted: 09/23/2020] [Indexed: 12/14/2022]
Abstract
RNA polymerase II (RNA Pol II) plays a major role in gene transcription for eukaryote. One of the major modes of regulation in eukaryotes is the phosphorylation of the carboxyl-terminal domain (CTD) of RNA Pol II. The current study found that the phosphorylation of Ser2, Ser5, Ser7, Thr4 and Tyr1 among the heptapeptide repeats of CTD plays a key role in the transcription process. We therefore review the biological functions and inhibitors of kinases that phosphorylate these amino acid residues including transcriptional cyclin-dependent protein kinases (CDKs), bromodomain-containing protein 4 (BRD4), Polo-like kinases 3 (Plk3) and Abelson murine leukemia viral oncogene 1 and 2 (c-Abl1/2).
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Lopes TZ, de Moraes FR, Tedesco AC, Arni RK, Rahal P, Calmon MF. Berberine associated photodynamic therapy promotes autophagy and apoptosis via ROS generation in renal carcinoma cells. Biomed Pharmacother 2019; 123:109794. [PMID: 31874443 DOI: 10.1016/j.biopha.2019.109794] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 12/05/2019] [Accepted: 12/10/2019] [Indexed: 12/12/2022] Open
Abstract
Renal cell carcinoma (RCC) consists of the most lethal common urological cancer and the clinical practice has shown that resistant RCC to commons therapies is extremely high. Berberine is an isoquinoline alkaloid, presents in different kinds of plants and it has long been used in Chinese medicine. It has several properties, such as antioxidant, anti-inflammatory, anti-diabetic, anti-microbial and anti-cancer. Moreover, berberine has photosensitive characteristics and its association with photodynamic therapy (PDT) is effective against tumor cells. This study aimed to evaluate the effects of berberine associated with PDT in renal carcinoma cell lines. The cellular viability assay showed increased cytotoxicity in concentration and time-dependent manner. Berberine presented efficient internalization in all cell lines analyzed. In addition, after treatment with berberine associated with PDT, it was observed a high phototoxicity effect with less than 20 % of viable cells. In this study we observed that the increase of reactive oxygen species (ROS) levels was accompanied by an increase of autophagy levels and apoptosis by caspase 3 activity, suggesting cell death by both mechanisms. Additionally, three target genes of anti-cancer drugs were differentially expressed in 786-O cells, being that Vascular Endothelial Growth Factor-D (FIGF) and Human Telomerase Reverse Transcriptase (TERT) gene presented low expression and Polo Like Kinase 3 (PLK3) presented overexpression after treatment with berberine associated with PDT. In this study, the proposed treatment triggered metabolites changes related to cell proliferation, tumorigenesis and angiogenesis. Thus, it was possible to suggest that berberine has promising potential as a photosensitizing agent in a photodynamic therapy, because it induced significant anticancer effects on renal carcinoma cells.
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Affiliation(s)
- Tairine Zara Lopes
- Laboratory of Genomics Studies, São Paulo State University, São José do Rio Preto, São Paulo, Brazil
| | - Fabio Rogério de Moraes
- Physics Department, São Paulo State University, São José do Rio Preto, São Paulo, Brazil; Multiuser Center for Biomolecular Innovation, São Paulo State University, São José do Rio Preto, São Paulo, Brazil
| | - Antonio Claudio Tedesco
- Department of Chemistry, Center of Nanotechnology and Tissue Engineering-Photobiology and Photomedicine Research Group, Faculty of Philosophy, Sciences and Letters of Ribeirao Preto, University of São Paulo, Ribeirao Preto, SP, Brazil
| | - Raghuvir Krishnaswamy Arni
- Physics Department, São Paulo State University, São José do Rio Preto, São Paulo, Brazil; Multiuser Center for Biomolecular Innovation, São Paulo State University, São José do Rio Preto, São Paulo, Brazil
| | - Paula Rahal
- Laboratory of Genomics Studies, São Paulo State University, São José do Rio Preto, São Paulo, Brazil
| | - Marilia Freitas Calmon
- Laboratory of Genomics Studies, São Paulo State University, São José do Rio Preto, São Paulo, Brazil.
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Hypoxia and Hypoxia-Inducible Factors in Kidney Injury and Repair. Cells 2019; 8:cells8030207. [PMID: 30823476 PMCID: PMC6468851 DOI: 10.3390/cells8030207] [Citation(s) in RCA: 162] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 02/21/2019] [Accepted: 02/25/2019] [Indexed: 02/07/2023] Open
Abstract
Acute kidney injury (AKI) is a major kidney disease characterized by an abrupt loss of renal function. Accumulating evidence indicates that incomplete or maladaptive repair after AKI can result in kidney fibrosis and the development and progression of chronic kidney disease (CKD). Hypoxia, a condition of insufficient supply of oxygen to cells and tissues, occurs in both acute and chronic kidney diseases under a variety of clinical and experimental conditions. Hypoxia-inducible factors (HIFs) are the "master" transcription factors responsible for gene expression in hypoxia. Recent researches demonstrate that HIFs play an important role in kidney injury and repair by regulating HIF target genes, including microRNAs. However, there are controversies regarding the pathological roles of HIFs in kidney injury and repair. In this review, we describe the regulation, expression, and functions of HIFs, and their target genes and related functions. We also discuss the involvement of HIFs in AKI and kidney repair, presenting HIFs as effective therapeutic targets.
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Lin C, Bai S, Du T, Lai Y, Chen X, Peng S, Ma X, Wu W, Guo Z, Huang H. Polo-like kinase 3 is associated with poor prognosis and regulates proliferation and metastasis in prostate cancer. Cancer Manag Res 2019; 11:1517-1524. [PMID: 30863161 PMCID: PMC6388943 DOI: 10.2147/cmar.s176762] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Background Biological mechanism of prostate cancer (PCa) recurrence and progress is complex but many of the key elements are not fully understood. Polo-like kinases (Plks) represent a family of highly conserved serine–threonine kinases that play essential roles in cell cycle progression. Plk3 plays contradictory roles in different cancers. However, the roles of Plk3 in PCa remain largely unexplored. Methods Kaplan–Meier analysis and Cox regression analysis were performed to evaluate the relationship between Plk3 and prognosis of patients with PCa. Gene set enrichment analysis (GSEA) was conducted to evaluate proliferation and metastasis gene sets using The Cancer Genome Atlas Dataset. MTS assay, clone formation assay, cell migration, and wound healing assay were carried out to investigate biological functions of Plk3. Results We found that high Plk3 expression was closely correlated with poor prognosis. GSEA revealed that Plk3 was involved in proliferation and metastasis. Loss-of-function assays demonstrated that Plk3 promoted proliferation and metastasis in PCa cells in vitro. Conclusion We discovered that Plk3 plays a critical role in PCa, indicating that it may be a potential prognostic marker and help predict the progression, especially recurrence of PCa.
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Affiliation(s)
- Chunhao Lin
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ; .,Department of Urology, Sun Yatsen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ;
| | - Shoumin Bai
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ; .,Department of Radiation Oncology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China
| | - Tao Du
- Department of Obstetrics and Gynecology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China
| | - Yiming Lai
- Department of Urology, Sun Yatsen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ;
| | - Xianju Chen
- Department of Urology, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518017, China
| | - Shengmeng Peng
- Department of Urology, Sun Yatsen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ;
| | - Xiaoming Ma
- Department of Urology, Sun Yatsen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ;
| | - Wanhua Wu
- Department of Urology, Sun Yatsen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ;
| | - Zhenghui Guo
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ; .,Department of Urology, Sun Yatsen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ;
| | - Hai Huang
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ; .,Department of Urology, Sun Yatsen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China, ;
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Zynda ER, Maloy MH, Kandel ES. The role of PAK1 in the sensitivity of kidney epithelial cells to ischemia-like conditions. Cell Cycle 2019; 18:596-604. [PMID: 30724698 DOI: 10.1080/15384101.2019.1578149] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Kidney ischemia, characterized by insufficient supply of oxygen and nutrients to renal epithelial cells, is the main cause of acute kidney injury and an important contributor to mortality world-wide. Earlier research implicated a G-protein coupled receptor (NK1R) in the death of kidney epithelial cells in ischemia-like conditions. P21-associated kinase 1 (PAK1) is involved in signalling by several G-proteins. We explored the consequences of PAK1 inhibition for cell survival under the conditions of reduced glucose and oxygen. Inhibition of PAK1 by RNA interference, expression of a dominant-negative mutant or treatment with small molecule inhibitors greatly reduced the death of cultured kidney epithelial cells. Similar protection was achieved by treating the cells with inhibitors of MEK1, in agreement with the prior reports on PAK1-MEK1 connection. Concomitant inhibition of NK1R and PAK1 offered no better protection than inhibition of NK1R alone, consistent with the two proteins being members of the same pathway. Furthermore, NK1R, PAK and MEK inhibitors reduced the induction of TRAIL in ischemia-like conditions. Considering the emerging role of TRAIL in ischemia-mediated cell death, this phenomenon may contribute to the protective effects of these small molecules. Our findings support further exploration of PAK and MEK inhibitors as possible agents to avert ischemic kidney injury.
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Affiliation(s)
- Evan R Zynda
- a Department of Cell Stress Biology , Roswell Park Comprehensive Cancer Center , Buffalo , NY , USA
| | - Mitchell H Maloy
- a Department of Cell Stress Biology , Roswell Park Comprehensive Cancer Center , Buffalo , NY , USA
| | - Eugene S Kandel
- a Department of Cell Stress Biology , Roswell Park Comprehensive Cancer Center , Buffalo , NY , USA
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