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Wu H, Qian J, Zhou L, Hu T, Zhang Y, Wang C, Yang Y, Gu C. FHND004 inhibits malignant proliferation of multiple myeloma by targeting PDZ-binding kinase in MAPK pathway. Aging (Albany NY) 2024; 16:4811-4831. [PMID: 38460944 DOI: 10.18632/aging.205634] [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: 11/01/2023] [Accepted: 02/08/2024] [Indexed: 03/11/2024]
Abstract
Inhibitors of Epidermal growth factor receptor tyrosine kinase (EGFR-TKIs) are producing impressive benefits to responsive types of cancers but challenged with drug resistances. FHND drugs are newly modified small molecule inhibitors based on the third-generation EGFR-TKI AZD9291 (Osimertinib) that are mainly for targeting the mutant-selective EGFR, particularly for the non-small cell lung cancer (NSCLC). Successful applications of EGFR-TKIs to other cancers are less certain, thus the present pre-clinical study aims to explore the anticancer effect and downstream targets of FHND in multiple myeloma (MM), which is an incurable hematological malignancy and reported to be insensitive to first/second generation EGFR-TKIs (Gefitinib/Afatinib). Cell-based assays revealed that FHND004 and FHND008 significantly inhibited MM cell proliferation and promoted apoptosis. The RNA-seq identified the involvement of the MAPK signaling pathway. The protein chip screened PDZ-binding kinase (PBK) as a potential drug target. The interaction between PBK and FHND004 was verified by molecular docking and microscale thermophoresis (MST) assay with site mutation (N124/D125). Moreover, the public clinical datasets showed high expression of PBK was associated with poor clinical outcomes. PBK overexpression evidently promoted the proliferation of two MM cell lines, whereas the FHND004 treatment significantly inhibited survival of 5TMM3VT cell-derived model mice and growth of patient-derived xenograft (PDX) tumors. The mechanistic study showed that FHND004 downregulated PBK expression, thus mediating ERK1/2 phosphorylation in the MAPK pathway. Our study not only demonstrates PBK as a promising novel target of FHND004 to inhibit MM cell proliferation, but also expands the EGFR kinase-independent direction for developing anti-myeloma therapy.
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Affiliation(s)
- Hongjie Wu
- Nanjing Hospital of Chinese Medicine Affiliated to Nanjing University of Chinese Medicine, Nanjing, China
- School of Medicine and Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Jinjun Qian
- School of Medicine and Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Lianxin Zhou
- School of Medicine and Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Tingting Hu
- School of Medicine and Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yuanjiao Zhang
- School of Medicine and Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Chen Wang
- School of Medicine and Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Ye Yang
- School of Medicine and Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Chunyan Gu
- Nanjing Hospital of Chinese Medicine Affiliated to Nanjing University of Chinese Medicine, Nanjing, China
- School of Medicine and Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
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Zhao S, Cui J, Cao L, Han K, Ma X, Chen H, Yin S, Zhao C, Ma C, Hu H. Xanthohumol inhibits non-small cell lung cancer via directly targeting T-lymphokine-activated killer cell-originated protein kinase. Phytother Res 2023. [PMID: 36882184 DOI: 10.1002/ptr.7799] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 01/30/2023] [Accepted: 02/12/2023] [Indexed: 03/09/2023]
Abstract
Xanthohumol is a principal prenylated chalcone isolated from hops. Previous studies have shown that xanthohumol was effective against various types of cancer, but the mechanisms, especially the direct targets for xanthohumol to exert an anticancer effect, remain elusive. Overexpression of T-lymphokine-activated killer cell-originated protein kinase (TOPK) promotes tumorigenesis, invasion and metastasis, implying the likely potential for targeting TOPK in cancer prevention and treatment. In the present study, we found that xanthohumol significantly inhibited the cell proliferation, migration and invasion of non-small cell lung cancer (NSCLC) in vitro and suppressed tumor growth in vivo, which is well correlated with inactivating TOPK, evidenced by reduced phosphorylation of TOPK and its downstream signaling histone H3 and Akt, and decreased its kinase activity. Moreover, molecular docking and biomolecular interaction analysis showed that xanthohumol was able to directly bind to the TOPK protein, suggesting that TOPK inactivation by xanthohumol is attributed to its ability to directly interact with TOPK. The findings of the present study identified TOPK as a direct target for xanthohumol to exert its anticancer activity, revealing novel insight into the mechanisms underlying the anticancer activity of xanthohumol.
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Affiliation(s)
- Shuang Zhao
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Jinling Cui
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Lixing Cao
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Kai Han
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Xuan Ma
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Hui Chen
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Shutao Yin
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Chong Zhao
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Changwei Ma
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Hongbo Hu
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
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3
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Wang H, Zhu X, Zhao Y, Zang Y, Zhang J, Kang Y, Yang Z, Lin P, Zhang L, Zhang S. Markov State Models Underlying the N-Terminal Premodel of TOPK/PBK. J Phys Chem B 2022; 126:10662-10671. [PMID: 36512332 DOI: 10.1021/acs.jpcb.2c06559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Lymphokine-activated killer T-cell-originated protein kinase (TOPK) is a potential target for cancer therapy. To explore the micromechanism, we proposed the N-terminal premodel (NTPM) of the TOPK monomer via homology modeling and molecular dynamic simulations and analyzed the conformational dynamics by Markov state model analysis. The electronegative insert (ENI) motif of the NTPM can be opened with a small probability under wild type, regulated by the so-called "N-C" interaction zone consisting of the N-terminal head, the coil between β3-strand and αC-helix, and the ENI motif. Glutamate substitution at threonine residue 9 or tyrosine residue 74 promotes the closed-open transition, revealing the details of phosphorylation. Allosteric effects induce functionally relevant structural changes, such as increased structural flexibility and active sites, which are thought to be necessary for further activation or binding. These findings provide rational structural templates for designing state-dependent inhibitors and give insight into the molecular regulatory mechanisms of TOPK monomers.
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Affiliation(s)
- He Wang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Xun Zhu
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Yizhen Zhao
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Yongjian Zang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Jianwen Zhang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Ying Kang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Zhiwei Yang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Peng Lin
- National Translational Science Center for Molecular Medicine & Department of Cell Biology, Fourth Military Medical University, Xi'an710032, China
| | - Lei Zhang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Shengli Zhang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an710049, China
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4
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The role of T-LAK cell-originated protein kinase in targeted cancer therapy. Mol Cell Biochem 2022; 477:759-769. [PMID: 35037144 DOI: 10.1007/s11010-021-04329-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 12/07/2021] [Indexed: 10/19/2022]
Abstract
Targeted therapy has gradually become the first-line clinical tumor therapy due to its high specificity and low rate of side effects. TOPK (T-LAK cell-originated protein kinase), a MAP kinase, is highly expressed in various tumor tissues, while it is rarely expressed in normal tissues, with the exceptions of testicular germ cells and some fetal tissues. It can promote cancer cell proliferation and migration and is also related to drug resistance. Therefore, TOPK is considered a good therapeutic target. Moreover, a number of studies have shown that targeting TOPK can inhibit the proliferation of cancer cells and promote their apoptosis. Here, we discussed the biological functions of TOPK in cancer and summarized its tumor-related signaling network and known TOPK inhibitors. Finally, the role of TOPK in targeted cancer therapy was concluded, and future research directions for TOPK were assessed.
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Wen H, Chen Z, Li M, Huang Q, Deng Y, Zheng J, Xiong M, Wang P, Zhang W. An Integrative Pan-Cancer Analysis of PBK in Human Tumors. Front Mol Biosci 2021; 8:755911. [PMID: 34859049 PMCID: PMC8631476 DOI: 10.3389/fmolb.2021.755911] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 10/04/2021] [Indexed: 12/17/2022] Open
Abstract
Background: PDZ binding kinase (PBK) is a serine/threonine kinase, which belongs to the mitogen-activated protein kinase kinase (MAPKK) family. It has been shown to be a critical gene in the regulation of mitosis and tumorigenesis, but the role of PBK in various cancers remains unclear. In this study, we systematically explored the prognostic and predictive value of PBK expression in 33 cancer types. Methods: Public databases including the cBioPortal database, GDSC database, GTEx database, CCLE database, and TCGA database were used to detect the PBK expression and its association with the prognosis, clinicopathologic stage, TMB, MSI, immune microenvironment, immune checkpoints, immune cell infiltration, enrichment pathways, and IC50 across pan-cancer. The statistical analyses and visualization were conducted using R software. Results: PBK expression is relatively high in most cancers compared to their normal counterparts, and this gene is barely expressed in normal tissues. High expression of PBK is significantly associated with poor prognosis and clinicopathologic stages I, II, and III in different cancers. Furthermore, PBK expression is strongly associated with TMB in 23 cancer types and associated with MSI in nine cancer types. Moreover, the correlation analysis of the microenvironment and immune cells indicated that PBK is negatively correlated with the immune infiltration levels but positively correlated with the infiltration levels of M0 and M1 macrophages, T cells CD4 memory activated, and T cells follicular helper. GSEA analysis revealed that the biological function or pathways relevant to the cell cycle and mitosis were frequently enriched at the level of high expression of PBK. Conclusion: These results revealed the oncogenic role of PBK, which is significantly upregulated in various cancers and indicated poor prognosis and immune infiltration in multiple cancers. It also suggested that PBK may serve as a biomarker in multiple tumor progress and patient survival.
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Affiliation(s)
- Huantao Wen
- The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Zitao Chen
- The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Min Li
- The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Qiongzhen Huang
- The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Yuhao Deng
- The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Jiawei Zheng
- The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Moliang Xiong
- The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Pengfei Wang
- The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Wangming Zhang
- The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
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Ma H, Han F, Yan X, Qi G, Li Y, Li R, Yan S, Yuan C, Song K, Kong B. PBK promotes aggressive phenotypes of cervical cancer through ERK/c-Myc signaling pathway. J Cell Physiol 2021; 236:2767-2781. [PMID: 33184870 DOI: 10.1002/jcp.30134] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 08/20/2020] [Accepted: 08/24/2020] [Indexed: 12/12/2022]
Abstract
Cervical cancer is the fourth most frequent cancer in women worldwide. PDZ-binding kinase (PBK) is proven to promote the malignant behaviors of various carcinomas. However, its functional roles and oncogenic mechanisms in cervical cancer are poorly understood. In this study, we reported that PBK was highly expressed in cervical cancer tissues. PBK promoted the proliferation, metastasis, and cisplatin resistance of cervical cancer cells. OTS514, a specific PBK inhibitor, could significantly suppress proliferation and metastasis of cervical cancer cells in vitro and in a xenograft model. Besides, OTS514 could enhance cisplatin-based chemosensitivity in cervical cancer cells. Mechanistically, PBK promoted the expression and stabilization of c-Myc through phosphorylating ERK1/2. OTS514 suppressed the phosphorylation of ERK1/2 and the transcriptional activity of c-Myc. Furthermore, inhibition of the ERK signal pathway by U0126 reversed the increased proliferation and metastasis induced by overexpression of PBK. Exogenous expression of c-Myc counteracted the decreased proliferation and metastasis evoked by knockdown of PBK. In conclusion, PBK promoted the malignant progression of cervical cancer through ERK/c-Myc signal pathway. PBK might be a promising molecular target for cervical cancer treatment.
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Affiliation(s)
- Hanlin Ma
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China
- Department of Oncology, Gynecologic Oncology Key Laboratory of Shandong Province, Qilu Hospital of Shandong University, Jinan, China
| | - Fang Han
- Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, China
| | - Xiaohui Yan
- Department of Infectious Diseases, Binzhou People's Hospital, Binzhou, China
| | - Gonghua Qi
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China
| | - Yingwei Li
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China
- Department of Cell Biology, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Rongrong Li
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China
- Department of Oncology, Gynecologic Oncology Key Laboratory of Shandong Province, Qilu Hospital of Shandong University, Jinan, China
| | - Shi Yan
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China
- Department of Oncology, Gynecologic Oncology Key Laboratory of Shandong Province, Qilu Hospital of Shandong University, Jinan, China
| | - Cunzhong Yuan
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China
- Department of Oncology, Gynecologic Oncology Key Laboratory of Shandong Province, Qilu Hospital of Shandong University, Jinan, China
| | - Kun Song
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China
- Department of Oncology, Gynecologic Oncology Key Laboratory of Shandong Province, Qilu Hospital of Shandong University, Jinan, China
| | - Beihua Kong
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China
- Department of Oncology, Gynecologic Oncology Key Laboratory of Shandong Province, Qilu Hospital of Shandong University, Jinan, China
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7
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PBK/TOPK: A Therapeutic Target Worthy of Attention. Cells 2021; 10:cells10020371. [PMID: 33670114 PMCID: PMC7916869 DOI: 10.3390/cells10020371] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 02/05/2021] [Accepted: 02/09/2021] [Indexed: 12/18/2022] Open
Abstract
Accumulating evidence supports the role of PDZ-binding kinase (PBK)/T-lymphokine-activated killer-cell-originated protein kinase (TOPK) in mitosis and cell-cycle progression of mitotically active cells, especially proliferative malignant cells. PBK/TOPK was confirmed to be associated with the development, progression, and metastasis of malignancies. Therefore, it is a potential therapeutic target in cancer therapy. Many studies have been conducted to explore the clinical applicability of potent PBK/TOPK inhibitors. However, PBK/TOPK has also been shown to be overexpressed in normal proliferative cells, including sperm and neural precursor cells in the subventricular zone of the adult brain, as well as under pathological conditions, such as ischemic tissues, including the heart, brain, and kidney, and plays important roles in their physiological functions, including proliferation and self-renewal. Thus, more research is warranted to further our understanding of PBK/TOPK inhibitors before we can consider their applicability in clinical practice. In this study, we first review the findings, general features, and signaling mechanisms involved in the regulation of mitosis and cell cycle. We then review the functions of PBK/TOPK in pathological conditions, including tumors and ischemic conditions in the heart, brain, and kidney. Finally, we summarize the advances in potent and selective inhibitors and describe the potential use of PBK/TOPK inhibitors in clinical settings.
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Lee YJ, Park JH, Oh SM. Activation of NF-κB by TOPK upregulates Snail/Slug expression in TGF-β1 signaling to induce epithelial-mesenchymal transition and invasion of breast cancer cells. Biochem Biophys Res Commun 2020; 530:122-129. [PMID: 32828273 DOI: 10.1016/j.bbrc.2020.07.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 07/04/2020] [Indexed: 12/12/2022]
Abstract
TGF-β1 is known to induce epithelial-mesenchymal transition (EMT), which is a prerequisite for cancer cell invasion. Here we reveal that TOPK upregulates EMT and invasion of human breast cancer MDA-MB-231 or Hs578T cells via NF-κB-dependent Snail/Slug in TGF-β1 signaling. Endogenous TOPK expression was significantly increased in response to TGF-β1 and TOPK knockdown mitigated TGF-β1-induced breast cancer cell invasion. Interestingly, TOPK knockdown restored TGF-β1 suppression of E-cadherin expression and markedly reduced N-cadherin induced by TGF-β1. Also, NF-κB activity or expression of EMT markers Snail and Slug induced by TGF-β1 was decreased by TOPK knockdown. Meanwhile, knockdown of Snail or TOPK attenuated TGF-β1-induced breast cancer cell invasion. Taken, we conclude that TOPK mediates TGF-β1-induced EMT and invasion in breast cancer cells via NF-κB/Snail signaling, suggesting novel role of TOPK as therapeutic target in TGF-β1-mediated breast cancer development.
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Affiliation(s)
- Young-Ju Lee
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon, 35365, South Korea
| | - Jung-Hwan Park
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon, 35365, South Korea
| | - Sang-Muk Oh
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon, 35365, South Korea; Priority Research Center, Myunggok Medical Research Institute, College of Medicine, Konyang University, Daejeon, 35365, South Korea.
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9
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Park JH, Park SA, Lee YJ, Park HW, Oh SM. PBK attenuates paclitaxel-induced autophagic cell death by suppressing p53 in H460 non-small-cell lung cancer cells. FEBS Open Bio 2020; 10:937-950. [PMID: 32237067 PMCID: PMC7193173 DOI: 10.1002/2211-5463.12855] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 01/05/2020] [Accepted: 03/26/2020] [Indexed: 01/07/2023] Open
Abstract
PDZ‐binding kinase (PBK) has previously been shown to mediate chemoresistance of cancer cells to anticancer drugs. However, it remains unclear how PBK regulates paclitaxel‐induced cancer cell death. Here, we demonstrate that PBK hinders paclitaxel‐mediated autophagic cell death in H460 non‐small‐cell lung cancer cells. PBK knockdown increased apoptosis, autophagy, p53 level, and LC3 puncta upon paclitaxel treatment. Moreover, p53 expression facilitated an increase in the LC3‐II/LC3‐I ratio in response to paclitaxel, and PBK knockdown augmented paclitaxel‐mediated p53 transcriptional activity. Meanwhile, paclitaxel induced PBK‐mediated p53 nuclear export and its subsequent ubiquitination in control cells, but not in PBK knockdown cells. We conclude that PBK hampers paclitaxel‐induced autophagic cell death by suppressing p53, suggesting a potential role of PBK in p53‐mediated H460 cell death.
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Affiliation(s)
- Jung-Hwan Park
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon, Korea
| | - Sang-Ah Park
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon, Korea
| | - Young-Ju Lee
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon, Korea
| | - Hwan-Woo Park
- Department of Cell biology, College of Medicine, Konyang University, Daejeon, Korea
| | - Sang-Muk Oh
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon, Korea.,Priority Research Center, Myunggok Medical Research Institute, College of Medicine, Konyang University, Daejeon, Korea
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10
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Roychoudhury S, Kumar A, Bhatkar D, Sharma NK. Molecular avenues in targeted doxorubicin cancer therapy. Future Oncol 2020; 16:687-700. [PMID: 32253930 DOI: 10.2217/fon-2019-0458] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
In recent, intra- and inter-tumor heterogeneity is seen as one of key factors behind success and failure of chemotherapy. Incessant use of doxorubicin (DOX) drug is associated with numerous post-treatment debacles including cardiomyopathy, health disorders, reversal of tumor and formation of secondary tumors. The module of cancer treatment has undergone evolutionary changes by achieving crucial understanding on molecular, genetic, epigenetic and environmental adaptations by cancer cells. Therefore, there is a paradigm shift in cancer therapeutic by employing amalgam of peptide mimetic, small RNA mimetic, DNA repair protein inhibitors, signaling inhibitors and epigenetic modulators to achieve targeted and personalized DOX therapy. This review summarizes on recent therapeutic avenues that can potentiate DOX effects by removing discernible pitfalls among cancer patients.
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Affiliation(s)
- Sayantani Roychoudhury
- Cancer & Translational Lab, Dr. D. Y. Patil Biotechnology & Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune 411033, Maharashtra, India
| | - Ajay Kumar
- Cancer & Translational Lab, Dr. D. Y. Patil Biotechnology & Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune 411033, Maharashtra, India
| | - Devyani Bhatkar
- Cancer & Translational Lab, Dr. D. Y. Patil Biotechnology & Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune 411033, Maharashtra, India
| | - Nilesh Kumar Sharma
- Cancer & Translational Lab, Dr. D. Y. Patil Biotechnology & Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune 411033, Maharashtra, India
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11
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Stefka AT, Johnson D, Rosebeck S, Park JH, Nakamura Y, Jakubowiak AJ. Potent anti-myeloma activity of the TOPK inhibitor OTS514 in pre-clinical models. Cancer Med 2019; 9:324-334. [PMID: 31714026 PMCID: PMC6943155 DOI: 10.1002/cam4.2695] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 09/30/2019] [Accepted: 10/25/2019] [Indexed: 12/12/2022] Open
Abstract
Multiple myeloma (MM) continues to be considered incurable, necessitating new drug discovery. The mitotic kinase T‐LAK cell‐originated protein kinase/PDZ‐binding kinase (TOPK/PBK) is associated with proliferation of tumor cells, maintenance of cancer stem cells, and poor patient prognosis in many cancers. In this report, we demonstrate potent anti‐myeloma effects of the TOPK inhibitor OTS514 for the first time. OTS514 induces cell cycle arrest and apoptosis at nanomolar concentrations in a series of human myeloma cell lines (HMCL) and prevents outgrowth of a putative CD138+ stem cell population from MM patient‐derived peripheral blood mononuclear cells. In bone marrow cells from MM patients, OTS514 treatment exhibited preferential killing of the malignant CD138+ plasma cells compared with the CD138− compartment. In an aggressive mouse xenograft model, OTS964 given orally at 100 mg/kg 5 days per week was well tolerated and reduced tumor size by 48%‐81% compared to control depending on the initial graft size. FOXO3 and its transcriptional targets CDKN1A (p21) and CDKN1B (p27) were elevated and apoptosis was induced with OTS514 treatment of HMCLs. TOPK inhibition also induced loss of FOXM1 and disrupted AKT, p38 MAPK, and NF‐κB signaling. The effects of OTS514 were independent of p53 mutation or deletion status. Combination treatment of HMCLs with OTS514 and lenalidomide produced synergistic effects, providing a rationale for the evaluation of TOPK inhibition in existing myeloma treatment regimens.
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Affiliation(s)
- Andrew T Stefka
- Department of Medicine, University of Chicago, Chicago, IL, USA
| | - David Johnson
- Department of Medicine, University of Chicago, Chicago, IL, USA
| | - Shaun Rosebeck
- Department of Medicine, University of Chicago, Chicago, IL, USA
| | - Jae-Hyun Park
- Department of Medicine, University of Chicago, Chicago, IL, USA
| | - Yusuke Nakamura
- Department of Medicine, University of Chicago, Chicago, IL, USA
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Lu S, Ye L, Yin S, Zhao C, Yan M, Liu X, Cui J, Hu H. Glycyrol exerts potent therapeutic effect on lung cancer via directly inactivating T-LAK cell-originated protein kinase. Pharmacol Res 2019; 147:104366. [PMID: 31377221 DOI: 10.1016/j.phrs.2019.104366] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 06/20/2019] [Accepted: 07/19/2019] [Indexed: 01/03/2023]
Abstract
Molecular targeted therapy for non-small cell lung cancer (NSCLC) has demonstrated promising outcomes. T-lymphokine-activated killer cell-originated protein kinase (TOPK) is found overexpressed in many cancer types such as NSCLC, and is considered to be an effective target for lung cancer treatment. In the present study, we found that glycyrol (GC), a representative coumarin compound isolated from licorice, was highly effective against several human NSCLC cell lines in vitro, and significantly suppressed tumor growth in vivo. Mechanistically, we demonstrated that GC can strongly bind to the TOPK protein and inhibited its kinase activity, leading to the activation of apoptotic signaling pathways. The findings of the present study suggest that GC is a novel promising TOPK inhibitor and this compound deserves to be further investigated for its potential anti-NSCLC activity.
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Affiliation(s)
- Shangyun Lu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, Beijing Key Laboratory for Food Non-thermal Processing, China Agricultural University, Beijing, China
| | - Linhu Ye
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, Beijing Key Laboratory for Food Non-thermal Processing, China Agricultural University, Beijing, China
| | - Shutao Yin
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, Beijing Key Laboratory for Food Non-thermal Processing, China Agricultural University, Beijing, China
| | - Chong Zhao
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, Beijing Key Laboratory for Food Non-thermal Processing, China Agricultural University, Beijing, China
| | - Mingzhu Yan
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, Beijing Key Laboratory for Food Non-thermal Processing, China Agricultural University, Beijing, China
| | - Xiaoyi Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, Beijing Key Laboratory for Food Non-thermal Processing, China Agricultural University, Beijing, China
| | - Jinling Cui
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, Beijing Key Laboratory for Food Non-thermal Processing, China Agricultural University, Beijing, China
| | - Hongbo Hu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, Beijing Key Laboratory for Food Non-thermal Processing, China Agricultural University, Beijing, China.
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13
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Xiao L, Ma N, He H, Li J, Cheng S, Yang Q, Hou Y, Song F, Jin H, Su X, Dong J, Zuo R, Song X, Duan W, Hou Y. Development of a novel drug targeting delivery system for cervical cancer therapy. NANOTECHNOLOGY 2019; 30:075604. [PMID: 30523991 DOI: 10.1088/1361-6528/aaf3f8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
'Targeting peptides' have demonstrated their value in diagnostic imaging and therapy and novel peptide probes specific to cervical cancer were developed. In the M13KE phage dodecapeptide (12-mer) peptide library, the phage clone S7 showed the best binding to the cancer cells as confirmed by immunofluorescence and flow cytometry assays, and was selected for continued studies. Its binding peptide, CSP3, was synthesized from the sequence of S7's 12-mer at the N-terminus of the minor coat protein pIII of this M13KE phage vector. The peptide's binding was analyzed by the same assays used for S7. It was also assessed using competitive inhibition and binding to a tissue chip. The results demonstrated that the CSP3 peptide bound to cervical carcinoma cells with high sensitivity and specificity. The positive results indicated that the peptide CSP3, conjugated with nanomaterials and chemotherapeutics, may be developed as a targeting vehicle for therapeutic drug delivery against cervical cancer, especially cervical cancer with multiple drug resistance. For this aim, we prepared a CSP3 conjugated liposome drug delivery system containing doxorubicin (DOX) and microRNA101 (miR101) expression plasmids (CSP3-Lipo-DOX-miR101), and the primary result showed that the system demonstrated significantly enhanced cytotoxicity to SiHa cells and DOX resistant SiHa cells, SiHa/ADR. Our results showed that CSP3 is a cervical cancer targeting 12aa peptide with high specificity and sensitivity, and the CSP3 conjugated drug delivery system, CSP3-Lipo-DOX-miR101 has promising potential for development as an efficient drug system for the therapy of cervical cancer.
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Affiliation(s)
- Li Xiao
- Laboratory of Tumor Molecular and Cellular Biology, College of Life Sciences, Shaanxi Normal University, 620 West Chang'an Avenue, Xi'an, Shaanxi 710119, People's Republic of China
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14
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Gao T, Hu Q, Hu X, Lei Q, Feng Z, Yu X, Peng C, Song X, He H, Xu Y, Zuo W, Zeng J, Liu Z, Yu L. Novel selective TOPK inhibitor SKLB-C05 inhibits colorectal carcinoma growth and metastasis. Cancer Lett 2018; 445:11-23. [PMID: 30590102 DOI: 10.1016/j.canlet.2018.12.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 12/08/2018] [Accepted: 12/11/2018] [Indexed: 02/05/2023]
Abstract
The mitogen-activated protein kinase (MAPK) signaling pathway member T-LAK cell-originated protein kinase/PDZ-binding kinase (TOPK/PBK) is closely involved in tumorigenesis and progression. Its overexpression in colorectal carcinoma (CRC) exacerbates tumor malignancy, promotes metastasis and results in dismal prognosis. Therefore, targeting TOPK is a promising approach for CRC therapy. Here, we report the development of a TOPK selective inhibitor SKLB-C05, with subnanomolar inhibitory potency. In vitro, SKLB-C05 exhibited excellent cytotoxicity and anti-migration and invasion activity on TOPK high-expressing CRC cells and induced cell apoptosis. These activities could attribute to its inhibition of TOPK downstream signaling including extracellular signal-regulated kinase 1/2 (ERK1/2), p38, and c-Jun N-terminal kinase 1, 2, and 3 (JNK1/2/3), as well as downregulation of FAK/Src- MMP signaling. Furthermore, SKLB-C05 disrupted cell mitosis and blocked CRC cell cycle. In vivo, oral administration of SKLB-C05 at concentrations of 20 and 10 mg kg-1·day-1 dramatically attenuated CRC tumor xenograft growth and completely suppressed hepatic metastasis of HCT116 cells, respectively. Thus, these findings suggest that SKLB-C05 is a specific TOPK inhibitor with potent anti-CRC oncogenic activity in vitro and in vivo.
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Affiliation(s)
- Tiantao Gao
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China
| | - Quanfang Hu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China
| | - Xi Hu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China
| | - Qian Lei
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China
| | - Zhanzhan Feng
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China
| | - Xi Yu
- Carey Business School, Johns Hopkins University, Baltimore, MD, 21202, USA
| | - Cuiting Peng
- School of Chemical Engineering, Sichuan University, Chengdu, 610041, China
| | - Xuejiao Song
- Research Center for Public Health and Preventive Medicine, West China School of Public Health, Sichuan University, Chengdu, Sichuan, China
| | - Hualong He
- School of Chemical Engineering, Sichuan University, Chengdu, 610041, China
| | - Ying Xu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China
| | - Weiqiong Zuo
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China
| | - Jun Zeng
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China
| | - Zhihao Liu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China.
| | - Luoting Yu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Collaborative Innovation Center for Biotherapy, 17 #3rd Section, Ren Min South Road, Chengdu, 610041, China.
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15
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Herbert KJ, Ashton TM, Prevo R, Pirovano G, Higgins GS. T-LAK cell-originated protein kinase (TOPK): an emerging target for cancer-specific therapeutics. Cell Death Dis 2018; 9:1089. [PMID: 30356039 PMCID: PMC6200809 DOI: 10.1038/s41419-018-1131-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 10/03/2018] [Accepted: 10/08/2018] [Indexed: 12/17/2022]
Abstract
'Targeted' or 'biological' cancer treatments rely on differential gene expression between normal tissue and cancer, and genetic changes that render tumour cells especially sensitive to the agent being applied. Problems exist with the application of many agents as a result of damage to local tissues, tumour evolution and treatment resistance, or through systemic toxicity. Hence, there is a therapeutic need to uncover specific clinical targets which enhance the efficacy of cancer treatment whilst minimising the risk to healthy tissues. T-LAK cell-originated protein kinase (TOPK) is a MAPKK-like kinase which plays a role in cell cycle regulation and mitotic progression. As a consequence, TOPK expression is minimal in differentiated cells, although its overexpression is a pathophysiological feature of many tumours. Hence, TOPK has garnered interest as a cancer-specific biomarker and biochemical target with the potential to enhance cancer therapy whilst causing minimal harm to normal tissues. Small molecule inhibitors of TOPK have produced encouraging results as a stand-alone treatment in vitro and in vivo, and are expected to advance into clinical trials in the near future. In this review, we present the current literature pertaining to TOPK as a potential clinical target and describe the progress made in uncovering its role in tumour development. Firstly, we describe the functional role of TOPK as a pro-oncogenic kinase, followed by a discussion of its potential as a target for the treatment of cancers with high-TOPK expression. Next, we provide an overview of the current preclinical progress in TOPK inhibitor discovery and development, with respect to future adaptation for clinical use.
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Affiliation(s)
- Katharine J Herbert
- CRUK/MRC Oxford Institute for Radiation Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, OX3 7DQ, UK.
| | - Thomas M Ashton
- CRUK/MRC Oxford Institute for Radiation Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Remko Prevo
- CRUK/MRC Oxford Institute for Radiation Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Giacomo Pirovano
- Department of Radiology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA
| | - Geoff S Higgins
- CRUK/MRC Oxford Institute for Radiation Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, OX3 7DQ, UK
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16
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Ishikawa C, Senba M, Mori N. Mitotic kinase PBK/TOPK as a therapeutic target for adult T‑cell leukemia/lymphoma. Int J Oncol 2018; 53:801-814. [PMID: 29901068 DOI: 10.3892/ijo.2018.4427] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 05/03/2018] [Indexed: 11/06/2022] Open
Abstract
Adult T‑cell leukemia/lymphoma (ATLL) is a disorder involving human T-cell leukemia virus type 1 (HTLV‑1)-infected T‑cells characterized by increased clonal neoplastic proliferation. PDZ-binding kinase (PBK) [also known as T‑lymphokine-activated killer cell-originated protein kinase (TOPK)] is a serine/threonine kinase expressed in proliferative cells and is phosphorylated during mitosis. In this study, the expression and phosphorylation of PBK/TOPK were examined by western blot analysis and RT‑PCR. We found that PBK/TOPK was upregulated and phosphorylated in HTLV‑1-transformed T‑cell lines and ATLL‑derived T‑cell lines. Notably, CDK1/cyclin B1, which phosphorylates PBK/TOPK, was overexpressed in these cells. HTLV‑1 infection upregulated PBK/TOPK expression in peripheral blood mononuclear cells (PBMCs) in co-culture assays. The potent PBK/TOPK inhibitors, HI‑TOPK‑032, and fucoidan from brown algae, decreased the proliferation and viability of these cell lines in a dose‑dependent manner. By contrast, the effect of HI‑TOPK‑032 on PBMCs was less pronounced. Treatment with HI‑TOPK‑032 resulted in G1 cell cycle arrest, and decreased CDK6 expression and pRb phosphorylation, which are critical determinants of progression through the G1 phase. In addition, HI‑TOPK‑032 induced apoptosis, as evidenced by morphological changes, the cleavage of poly(ADP-ribose) polymerase with the activation of caspase‑3, -8 and -9, and an increase in the sub‑G1 cell population and APO2.7-positive cells. Moreover, HI‑TOPK‑032 inhibited the expression of cellular inhibitor of apoptosis 2 (c-IAP2), X-linked inhibitor of apoptosis protein (XIAP), survivin and myeloid cell leukemia‑1 (Mcl‑1), and induced the expression of Bak and interferon-induced protein with tetratricopeptide repeats (IFIT)1, 2 and 3. It is noteworthy that the use of this inhibitor led to the inhibition of the phosphorylation of IκB kinase (IKK)α, IKKβ, IκBα, phosphatase and tensin homolog (PTEN) and Akt, and to the decreased protein expression of JunB and JunD, suggesting that PBK/TOPK affects the nuclear factor-κB, Akt and activator protein‑1 signaling pathways. In vivo, the administration of HI‑TOPK‑032 suppressed tumor growth in an ATLL xenograft model. Thus, on the whole, this study on the identification and functional analysis of PBK/TOPK suggests that this kinase is a promising molecular target for ATLL treatment.
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Affiliation(s)
- Chie Ishikawa
- Department of Microbiology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903-0215, Japan
| | - Masachika Senba
- Department of Pathology, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan
| | - Naoki Mori
- Department of Microbiology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903-0215, Japan
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17
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Quan C, Xiao J, Duan Q, Yuan P, Xue P, Lu H, Yan M, Guo D, Xu S, Zhang X, Lin X, Wang Y, Dogan S, Zhang J, Zhu F, Ke C, Liu L. T-lymphokine-activated killer cell-originated protein kinase (TOPK) as a prognostic factor and a potential therapeutic target in glioma. Oncotarget 2017; 9:7782-7795. [PMID: 29487691 PMCID: PMC5814258 DOI: 10.18632/oncotarget.23674] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 12/11/2017] [Indexed: 11/25/2022] Open
Abstract
TOPK is overexpressed in various types of cancer and associated with poor outcomes in different types of cancer. In this study, we first found that the expression of T-lymphokine-activated killer cell-originated protein kinase (TOPK) was significantly higher in Grade III or Grade IV than that in Grade II in glioma (P = 0.007 and P < 0.001, respectively). Expression of TOPK was positively correlated with Ki67 (P < 0.001). Knockdown of TOPK significantly inhibited cell growth, colony formation and increased sensitivities to temozolomide (TMZ) in U-87 MG or U-251 cells, while TOPK overexpression promoted cell growth and colony formation in Hs 683 or A-172 cells. Glioma patients expressing high levels of TOPK have poor survival compared with those expressing low levels of TOPK in high-grade or low-grade gliomas (hazard ratio = 0.2995; 95% CI, 0.1262 to 0.7108; P = 0.0063 and hazard ratio = 0.1509; 95% CI, 0.05928 to 0.3842; P < 0.0001, respectively). The level of TOPK was low in TMZ-sensitive patients compared with TMZ-resistant patients (P = 0.0056). In TMZ-resistant population, patients expressing high TOPK have two months’ shorter survival time than those expressing low TOPK. Our findings demonstrated that TOPK might represent as a promising prognostic and predictive factor and potential therapeutic target for glioma.
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Affiliation(s)
- Chuntao Quan
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Juanjuan Xiao
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Qiuhong Duan
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Ping Yuan
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Peipei Xue
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Hui Lu
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Meng Yan
- Department of Pathology, Affiliated Tianyou Hospital of Wuhan University of Science and Technology, Wuhan, Hubei, PR China
| | - Dongsheng Guo
- Department of Neurosurgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Sanpeng Xu
- Department of Pathology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Xiaohui Zhang
- Department of Hematopathology and Laboratory Medicine, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, USA
| | - Xuan Lin
- Department of Endocrinology, China Resources and WISCO General Hospital, Wuhan, Hubei, PR China
| | - Yong Wang
- School of Medicine, Yichun University, Yuanzhou District, Yichun, Jiangxi, PR China
| | - Soner Dogan
- School of Medicine, Yeditepe University, Istanbul, Turkey
| | - Jianmin Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Feng Zhu
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Changshu Ke
- Department of Pathology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Lin Liu
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
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18
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Ishikawa C, Mori N. In vitro and in vivo anti-primary effusion lymphoma activities of fucoidan extracted from Cladosiphon okamuranus Tokida. Oncol Rep 2017; 38:3197-3204. [PMID: 29048633 DOI: 10.3892/or.2017.5978] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 09/11/2017] [Indexed: 11/05/2022] Open
Abstract
Primary effusion lymphoma (PEL) caused by Kaposi's sarcoma-associated herpesvirus (KSHV) is characterized by lymphomatous effusion in body cavities and poor prognosis. There is still no effective treatment for PEL. Fucoidan, a major sulfated polysaccharide isolated from brown seaweeds, has an attractive array of bioactivities such as cancer inhibition. However, the effects of fucoidan on PEL cells remain unclear. We investigated the anti-PEL effects of fucoidan obtained from Cladosiphon okamuranus Tokida cultivated in Okinawa. Fucoidan dose-dependently inhibited the proliferation of KSHV-infected PEL cell lines, and provoked G1 cell cycle arrest, which was accompanied by CDK4 and CDK6 downregulation. Fucoidan also induced apoptosis of PEL cells through caspase-3, -8 and -9 activation; this occurred partly through the downregulation of anti-apoptotic Bcl-xL, Mcl-1 and XIAP proteins. Fucoidan also suppressed nuclear factor-κB, activator protein-1 (AP-1), and T-lymphokine-activated killer cell-originated protein kinase (TOPK) signaling pathways through inhibition of phosphorylation of IκBα and TOPK, and the expression of AP-1 family proteins, JunB and JunD. Oral administration of fucoidan effectively inhibited the development of PEL cells and ascites in a xenograft SCID mouse model, with minimal serious adverse effects. Notably, native fucoidan exhibited a more efficient anti-PEL effect than nanoparticle fucoidan. These preclinical findings highlight the anti-PEL actions of fucoidan, suggesting it could be potentially useful for the prevention and treatment of PEL.
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Affiliation(s)
- Chie Ishikawa
- Department of Microbiology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903-0215, Japan
| | - Naoki Mori
- Department of Microbiology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903-0215, Japan
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19
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Li Y, Yang Z, Li W, Xu S, Wang T, Wang T, Niu M, Zhang S, Jia L, Li S. TOPK promotes lung cancer resistance to EGFR tyrosine kinase inhibitors by phosphorylating and activating c-Jun. Oncotarget 2017; 7:6748-64. [PMID: 26745678 PMCID: PMC4872746 DOI: 10.18632/oncotarget.6826] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2015] [Accepted: 12/31/2015] [Indexed: 12/16/2022] Open
Abstract
Tyrosine kinase inhibitors (TKIs) targeting the epidermal growth factor receptor (EGFR) have shown promising clinical efficacy in non-squamous non-small cell lung cancer (NSCLC); however, resistance is frequently observed in malignant cells, operating through a mechanism that remains largely unknown. The present study shows that T-lymphokine-activated killer cell-originated protein kinase (TOPK) is upregulated in NSCLC and excessively activated in TKI-refractory cells. TOPK dictates the responsiveness of lung cancers to the EGFR-targeted TKI gefitinib through the transcription factor AP-1 component c-Jun. TOPK binds directly to and phosphorylates c-Jun, which consequently activates the transcription of AP-1 target genes, including CCND1 and CDC2. TOPK silencing sensitizes EGFR-TKI-resistant lung cancer cells to gefitinib and increases gefitinib efficacy in preclinical lung adenocarcinoma xenograft models. These findings represent a novel mechanism of lung cancer resistance to TKIs and suggest that TOPK may have value both as a predictive biomarker and as a therapeutic target: TOPK-targeted therapy may synergize with EGFR-targeted therapy in lung cancers.
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Affiliation(s)
- Ying Li
- Department of Pulmonary and Critical Care Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Zhiwei Yang
- Department of Applied Physics, School of Science, Xi'an Jiaotong University, Xi'an, China.,Engineering Research Center of Forest Bio-preparation, Ministry of Education, Northeast Forestry University, Harbin, China
| | - Weijie Li
- Department of Pulmonary and Critical Care Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Shudi Xu
- Department of Pulmonary and Critical Care Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China.,Department of Pulmonary Medicine, Xi'an Ninth Hospital, Xi'an, China
| | - Tao Wang
- Department of Neurology, Shaanxi Provincial People's Hospital, Xi'an, China
| | - Ting Wang
- State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi'an, China
| | - Mengjie Niu
- Department of Pulmonary and Critical Care Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Shengli Zhang
- Department of Applied Physics, School of Science, Xi'an Jiaotong University, Xi'an, China
| | - Lintao Jia
- State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi'an, China
| | - Shengqing Li
- Department of Pulmonary and Critical Care Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
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20
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Lee HL, Park SH, Kim TM, Jung YY, Park MH, Oh SH, Yun HS, Jun HO, Yoo HS, Han SB, Lee US, Yoon JH, Song MJ, Hong JT. Bee venom inhibits growth of human cervical tumors in mice. Oncotarget 2016; 6:7280-92. [PMID: 25730901 PMCID: PMC4466684 DOI: 10.18632/oncotarget.3110] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 01/08/2015] [Indexed: 11/25/2022] Open
Abstract
We studied whether bee venom (BV) inhibits cervical tumor growth through enhancement of death receptor (DR) expressions and inactivation of nuclear factor kappa B (NF-κB) in mice. In vivo study showed that BV (1 mg/kg) inhibited tumor growth. Similar inhibitory effects of BV on cancer growth in primary human cervical cancer cells were also found. BV (1–5 μg/ml) also inhibited the growth of cancer cells, Ca Ski and C33Aby the induction of apoptotic cell death in a dose dependent manner. Agreed with cancer cell growth inhibition, expression of death receptors; FAS, DR3 and DR6, and DR downstream pro-apoptotic proteins including caspase-3 and Bax was concomitantly increased, but the NF-κB activity and the expression of Bcl-2 were inhibited by treatment with BV in tumor mice, human cancer cell and human tumor samples as well as cultured cancer cells. In addition, deletion of FAS, DR3 and DR6 by small interfering RNA significantly reversed BV-induced cell growth inhibitory effects as well as NF-κB inactivation. These results suggest that BV inhibits cervical tumor growth through enhancement of FAS, DR3 and DR6 expression via inhibition of NF-κB pathway.
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Affiliation(s)
- Hye Lim Lee
- College of Pharmacy and Medical Research Center, Heungduk, Cheongju, Chungbuk, Republic of Korea
| | - Sang Ho Park
- Clinical Research Laboratory, Uijeonbu St. Mary's Hospital, The Catholic University of Korea College of Medicine, Uijeongbu, Republic of Korea
| | - Tae Myoung Kim
- College of Veterinary Medicine, Chungbuk National University, Heungduk, Cheongju, Chungbuk, Republic of Korea
| | - Yu Yeon Jung
- College of Pharmacy and Medical Research Center, Heungduk, Cheongju, Chungbuk, Republic of Korea
| | - Mi Hee Park
- College of Pharmacy and Medical Research Center, Heungduk, Cheongju, Chungbuk, Republic of Korea
| | - Sang Hyun Oh
- College of Pharmacy and Medical Research Center, Heungduk, Cheongju, Chungbuk, Republic of Korea
| | - Hye Seok Yun
- College of Pharmacy and Medical Research Center, Heungduk, Cheongju, Chungbuk, Republic of Korea
| | - Hyung Ok Jun
- College of Pharmacy and Medical Research Center, Heungduk, Cheongju, Chungbuk, Republic of Korea
| | - Hwan Soo Yoo
- College of Pharmacy and Medical Research Center, Heungduk, Cheongju, Chungbuk, Republic of Korea
| | - Sang-Bae Han
- College of Pharmacy and Medical Research Center, Heungduk, Cheongju, Chungbuk, Republic of Korea
| | - Ung Soo Lee
- Department of Food Science & Technology, Korea National University of Transportation, Jeungpyeong, Republic of Korea
| | - Joo Hee Yoon
- Department of Obstetrics and Gynecology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Paldal-gu, Suwon, Gyeonggi-do, Republic of Korea
| | - Min Jong Song
- Department of Obstetrics and Gynecology, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Jung-gu, Daejeon, Republic of Korea
| | - Jin Tae Hong
- College of Pharmacy and Medical Research Center, Heungduk, Cheongju, Chungbuk, Republic of Korea
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Matsuo Y, Park JH, Miyamoto T, Yamamoto S, Hisada S, Alachkar H, Nakamura Y. TOPK inhibitor induces complete tumor regression in xenograft models of human cancer through inhibition of cytokinesis. Sci Transl Med 2015; 6:259ra145. [PMID: 25338756 DOI: 10.1126/scitranslmed.3010277] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
TOPK (T-lymphokine-activated killer cell-originated protein kinase) is highly and frequently transactivated in various cancer tissues, including lung and triple-negative breast cancers, and plays an indispensable role in the mitosis of cancer cells. We report the development of a potent TOPK inhibitor, OTS964 {(R)-9-(4-(1-(dimethylamino)propan-2-yl)phenyl)-8-hydroxy-6-methylthieno[2,3-c]quinolin-4(5H)-one}, which inhibits TOPK kinase activity with high affinity and selectivity. Similar to the knockdown effect of TOPK small interfering RNAs (siRNAs), this inhibitor causes a cytokinesis defect and the subsequent apoptosis of cancer cells in vitro as well as in xenograft models of human lung cancer. Although administration of the free compound induced hematopoietic adverse reactions (leukocytopenia associated with thrombocytosis), the drug delivered in a liposomal formulation effectively caused complete regression of transplanted tumors without showing any adverse reactions in mice. Our results suggest that the inhibition of TOPK activity may be a viable therapeutic option for the treatment of various human cancers.
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Affiliation(s)
- Yo Matsuo
- OncoTherapy Science Inc., Kawasaki, Kanagawa 213-0012, Japan
| | - Jae-Hyun Park
- Department of Medicine, The University of Chicago, Chicago, IL 60637, USA
| | | | - Shinji Yamamoto
- OncoTherapy Science Inc., Kawasaki, Kanagawa 213-0012, Japan
| | - Shoji Hisada
- OncoTherapy Science Inc., Kawasaki, Kanagawa 213-0012, Japan
| | - Houda Alachkar
- Department of Medicine, The University of Chicago, Chicago, IL 60637, USA
| | - Yusuke Nakamura
- Department of Medicine, The University of Chicago, Chicago, IL 60637, USA.
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22
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Zhao L, Lv M, Sayimu W, Liu W, Zhang H, Jiang BO, Wang D. Therapeutic effect of lymphokine-activated killer cells treated with low-dose ionizing radiation on osteosarcoma. Oncol Lett 2015; 10:879-882. [PMID: 26622587 DOI: 10.3892/ol.2015.3271] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Accepted: 04/09/2015] [Indexed: 12/16/2022] Open
Abstract
The aim of the present study was to investigate the effect of lymphokine-activated killer (LAK) cells, which received low-dose ionizing radiation, on the treatment of osteosarcoma in rats. The cultured UMR-106 cells were inoculated under the anterior chest skin of 24 rats to establish an osteosarcoma model. In addition, the LAK cells from 24 mice were exposed to doses of 0 (control group), 0.65 or 3.25 mGy X-ray radiation. The tritiated thymidine (3H-TdR) release method and Winn assay were performed to determine the antitumor effects of the LAK cells. The proliferation of the mouse LAK cells treated with 3.25 mGy radiation was significantly higher than that for those treated with 0 or 0.65 mGy radiation, which suggested that low-dose ionizing radiation stimulates the proliferation of LAK cells. The tumor-bearing rats were divided into three groups and injected with LAK cells that had already received 0, 0.65 or 3.25 mGy radiation. The mean survival time of the 3.25-mGy group was longer than that of the 0- and 0.65-mGy groups. After 30 days, tumors with weights of ~6.25 and 2.0 g were identified in the rats of the 0- and 0.65-mGy groups, respectively. However, tumor proliferation was not detectable in the rats of the 3.25-mGy radiation group. Therefore, low-dose ionizing radiation effectively kills osteosarcoma cells in rats by stimulating the proliferation and enhancing the cytotoxicity of LAK cells.
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Affiliation(s)
- Lei Zhao
- Department of Orthopedics, Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
| | - Ming Lv
- Department of Orthopedics, Zibo Central Hospital, Zibo, Shandong 255012, P.R. China
| | - Wuliya Sayimu
- Xinjiang Uygur Autonomous Region Center for Disease Control and Prevention, Urumqi, Xinjiang 830011, P.R. China
| | - Wei Liu
- Institute of Radiation Medicine, Shandong Academy of Medical Sciences, Jinan, Shandong 250062, P.R. China
| | - Huawu Zhang
- Department of Orthopedics, Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
| | - B O Jiang
- Department of Orthopedics, Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
| | - Dong Wang
- Department of Orthopedics, Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
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23
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Zhao H, Wang R, Tao Z, Yan F, Gao L, Liu X, Wang N, Min L, Jia Y, Zhao Y, Ji X, Luo Y. Activation of T-LAK-cell-originated protein kinase-mediated antioxidation protects against focal cerebral ischemia-reperfusion injury. FEBS J 2014; 281:4411-20. [PMID: 25065601 DOI: 10.1111/febs.12948] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 07/13/2014] [Accepted: 07/23/2014] [Indexed: 12/16/2022]
Abstract
T-LAK-cell-originated protein kinase (TOPK), a MAPKK-like kinase, is crucial for neural progenitor cell proliferation; however, the function of TOPK and the molecular mechanism underlying cerebral ischemia-reperfusion injury remains unknown. Therefore, we investigated the role of TOPK in experimental stroke. Sprague-Dawley rats underwent transient middle cerebral artery occlusion (tMCAO) and reperfusion, and TOPK small interfering RNA (siRNA) was delivered by intracerebroventricular injection at the beginning of MCAO. After TOPK overexpression and H2O2 stimulation in PC12 neuronal cells, antioxidative proteins, apoptosis-related proteins and signal pathways were detected by western blot analysis, the levels of the peroxidation products (malondialdehyde and 3-nitrotyrosine) were measured with ELISA. Phosphorylation of TOPK was increased in rat cortical neurons following tMCAO. TOPK overexpression in PC12 cells augmented levels of antioxidative proteins (peroxiredoxin 1 and 2, heme oxygenase 1 and manganese superoxide dismutase), as well as total superoxide dismutase activity, along with inhibition of malondialdehyde and 3-nitrotyrosine upon H2O2 stimulation. TOPK overexpression increased cell viability and reduced expression of caspase 3 and caspase 12 in PC12 cells in response to H2O2 . The p-ERK level was increased by TOPK overexpression, and antioxidative protection afforded by TOPK was abolished by blocking the extracellular signal-regulated kinase pathway in PC12 cells. TOPK siRNA increased the infarct volume and reduced total superoxide dismutase activity in the cortex in vivo after MCAO. These data reveal that activating TOPK confers neuroprotection against focal cerebral ischemia-reperfusion injury by antioxidative function, in part through activation of the extracellular signal-regulated kinase pathway.
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Affiliation(s)
- Haiping Zhao
- Cerebrovascular Diseases Research Institute and Department of Neurology, Xuanwu Hospital of Capital Medical University, Beijing, China; Beijing Geriatric Medical Research Center, Beijing, China; Key Laboratory of Neurodegenerative Diseases of Ministry of Education and Beijing Key Laboratory of Translational Medicine for Cerebrovascular Diseases, Beijing, China
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Park JH, Jeong YJ, Won HK, Choi SY, Park JH, Oh SM. Activation of TOPK by lipopolysaccharide promotes induction of inducible nitric oxide synthase through NF-κB activity in leukemia cells. Cell Signal 2014; 26:849-56. [PMID: 24440499 DOI: 10.1016/j.cellsig.2014.01.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 12/19/2013] [Accepted: 01/06/2014] [Indexed: 12/21/2022]
Abstract
T-LAK cell-originated protein kinase (TOPK) is known to be involved in tumorigenesis or cancer progression. However, the role of TOPK in inflammatory response remains elusive. Here we show that TOPK positively regulates inducible nitric oxide synthase (iNOS) gene expression and nitric oxide (NO) production in response to lipopolysaccharide (LPS). In TOPK-depleted cells, the iNOS expression was shown to be greatly abolished. Also, we revealed that LPS treatment augmented the expression and activity of TOPK, the interaction of TOPK with IκBα, and promoted TOPK kinase activity against IκBα. Moreover, NF-κB or iNOS promoter-driven transcriptional activity in response to LPS was markedly reduced by knocking down of TOPK or deletion of NF-κB sites. On the other hand, endogenous TOPK level was expressed very lowly in bone marrow-derived macrophage (BMDM) prepared from Toll-like receptor 4 (TLR4) knockout mice, compared to BMDM from wild type (WT) mice. Collectively, these findings demonstrate that TOPK upregulates iNOS gene expression in T cell leukemia Jurkat cells or macrophage leukemic Raw 264.7 cells via NF-κB activation in response to LPS, and might act as a critical effector in LPS/TLR4-mediated signaling cascade, suggesting a possible role of TOPK in inflammatory response or inflammation-related diseases.
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Affiliation(s)
- Jung-Hwan Park
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon 302-718, Republic of Korea
| | - Yu-Jin Jeong
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon 302-718, Republic of Korea
| | - Hee Kwan Won
- Department of Endocrinology and Metabolism, College of Medicine, Konyang University, Konyang Hospital, Daejeon 302-718, Republic of Korea
| | - Sang-Yun Choi
- Department of Life Sciences, School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea
| | - Jong-Hwan Park
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon 302-718, Republic of Korea
| | - Sang-Muk Oh
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon 302-718, Republic of Korea.
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