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Rho SB, Byun HJ, Kim BR, Lee CH. LKB1/STK11 Tumor Suppressor Reduces Angiogenesis by Directly Interacting with VEGFR2 in Tumorigenesis. Biomol Ther (Seoul) 2023:biomolther.2023.106. [PMID: 37357018 DOI: 10.4062/biomolther.2023.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 06/09/2023] [Accepted: 06/13/2023] [Indexed: 06/27/2023] Open
Abstract
Cervical tumors represent a prevalent form of cancer affecting women worldwide; current treatment options involve surgery, radiotherapy, and chemotherapy. Angiogenesis, the process of new blood vessel formation, is a crucial factor in cervical tumor growth. The molecular mechanisms underlying the effects of the liver kinase B1 (LKB1/STK11) tumor suppressor protein on tumor angiogenesis have not been elucidated. Therefore, we investigated the role of LKB1 in cervical tumor angiogenesis both in vitro and in vivo in this study. Our results demonstrated that LKB1 inhibited cervical tumor angiogenesis by suppressing the expression of angiogenesis-related factors such as vascular endothelial growth factor (VEGF) and hypoxia inducible factor-1α. LKB1 directly affected both carcinoma and vascular endothelial cells, resulting in a significant reduction in tumor growth and angiogenesis. Furthermore, LKB1 was found to bind to VEGF receptor 2 (VEGFR-2) and target the VEGFR-2-mediated protein kinase B/mechanistic target of rapamycin signaling pathway in endothelial cells, thereby reducing cervical tumor growth and angiogenesis. Our study provides new insights into the molecular mechanisms underlying the anti-tumor and anti-angiogenic effects of LKB1 in cervical cancer. These findings will help develop new therapeutic strategies for cervical cancer.
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Affiliation(s)
- Seung Bae Rho
- Division of Cancer Biology, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
| | - Hyun Jung Byun
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Boh-Ram Kim
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Chang Hoon Lee
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
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2
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Rho SB, Byun HJ, Kim BR, Lee CH. Liver Kinase B1 Mediates Its Anti-Tumor Function by Binding to the N-Terminus of Malic Enzyme 3. Biomol Ther (Seoul) 2023; 31:330-339. [PMID: 37095735 PMCID: PMC10129855 DOI: 10.4062/biomolther.2023.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/18/2023] [Accepted: 03/24/2023] [Indexed: 04/26/2023] Open
Abstract
Liver kinase B1 (LKB1) is a crucial tumor suppressor involved in various cellular processes, including embryonic development, tumor initiation and progression, cell adhesion, apoptosis, and metabolism. However, the precise mechanisms underlying its functions remain elusive. In this study, we demonstrate that LKB1 interacts directly with malic enzyme 3 (ME3) through the N-terminus of the enzyme and identified the binding regions necessary for this interaction. The binding activity was confirmed to promote the expression of ME3 in an LKB1-dependent manner and was also shown to induce apoptosis activity. Furthermore, LKB1 and ME3 overexpression upregulated the expression of tumour suppressor proteins (p53 and p21) and downregulated the expression of antiapoptotic proteins (nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) and B-cell lymphoma 2 (Bcl-2)). Additionally, LKB1 and ME3 enhanced the transcription of p21 and p53 and inhibited the transcription of NF-κB. Moreover, LKB1 and ME3 suppressed the phosphorylation of various components of the phosphatidylinositol-4,5-bisphosphate 3-kinase/protein kinase B signaling pathway. Overall, these results suggest that LKB1 promotes pro-apoptotic activities by inducing ME3 expression.
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Affiliation(s)
- Seung Bae Rho
- Division of Cancer Biology, Research Institute, National Cancer Center, Goyang 10408
| | - Hyun Jung Byun
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Boh-Ram Kim
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Chang Hoon Lee
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
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3
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Yu L, Lee H, Rho SB, Park MK, Lee CH. Ethacrynic Acid: A Promising Candidate for Drug Repurposing as an Anticancer Agent. Int J Mol Sci 2023; 24:ijms24076712. [PMID: 37047688 PMCID: PMC10094867 DOI: 10.3390/ijms24076712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 03/28/2023] [Accepted: 03/30/2023] [Indexed: 04/07/2023] Open
Abstract
Ethacrynic acid (ECA) is a diuretic that inhibits Na-K-2Cl cotransporter (NKCC2) present in the thick ascending loop of Henle and muculo dens and is clinically used for the treatment of edema caused by excessive body fluid. However, its clinical use is limited due to its low bioavailability and side effects, such as liver damage and hearing loss at high doses. Despite this, ECA has recently emerged as a potential anticancer agent through the approach of drug repositioning, with a novel mechanism of action. ECA has been shown to regulate cancer hallmark processes such as proliferation, apoptosis, migration and invasion, angiogenesis, inflammation, energy metabolism, and the increase of inhibitory growth factors through various mechanisms. Additionally, ECA has been used as a scaffold for synthesizing a new material, and various derivatives have been synthesized. This review explores the potential of ECA and its derivatives as anticancer agents, both alone and in combination with adjuvants, by examining their effects on ten hallmarks of cancer and neuronal contribution to cancer. Furthermore, we investigated the trend of synthesis research of a series of ECA derivatives to improve the bioavailability of ECA. This review highlights the importance of ECA research and its potential to provide a cost-effective alternative to new drug discovery and development for cancer treatment.
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Affiliation(s)
- Lu Yu
- College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Ho Lee
- Department of Cancer Biomedical Science, Graduate School of Cancer Science and Policy National Cancer Center, Goyang 10408, Republic of Korea
| | - Seung Bae Rho
- Department of Cancer Biomedical Science, Graduate School of Cancer Science and Policy National Cancer Center, Goyang 10408, Republic of Korea
| | - Mi Kyung Park
- College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
- Department of Cancer Biomedical Science, Graduate School of Cancer Science and Policy National Cancer Center, Goyang 10408, Republic of Korea
| | - Chang Hoon Lee
- College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
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Yu L, Ji Kim H, Kim B, Jung Byun H, Minh Nguyen T, Ji Kim E, Huy Phùng H, Hyeon Kim Y, Rahman M, Yun Jang J, Bae Rho S, Jin Kang G, Lee H, Lee K, Kyung Han H, Kyung Park M, Hoon Lee C. Ethacrynic acid suppresses B7-H4 expression involved in epithelial-mesenchymal transition of lung adenocarcinoma cells via inhibiting STAT3 pathway. Biochem Pharmacol 2023; 212:115537. [PMID: 37019184 DOI: 10.1016/j.bcp.2023.115537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Revised: 03/26/2023] [Accepted: 03/28/2023] [Indexed: 04/05/2023]
Abstract
Lung cancer is characterized by high incidence and mortality. 90% of cancer deaths are caused by metastases. The epithelial-mesenchymal transition (EMT) process in cancer cells is a prerequisite for the metastatic process. Ethacrynic acid (ECA) is a loop diuretic that inhibits the EMT process in lung cancer cells. EMT has been related to the tumour immunemicroenvironment. However, the effect of ECA on immune checkpoint molecules in the context of cancer has not been fully identified. In the present study, we found that sphingosylphosphorylcholine (SPC) and TGF-β1, awell-known EMT inducer, induced the expression of B7-H4 in lung cancer cells. We also investigated the involvement of B7-H4 in the SPC-induced EMT process. Knockdown of B7-H4 suppressed SPC-induced EMT, while B7-H4 overexpression enhanced EMT of lung cancer cells. ECA inhibited SPC/TGF-β1-induced B7-H4 expression via suppression of STAT3 activation. Moreover, ECA inhibits the colonization of mice lung by tail vein-injected LLC1 cells. ECA-treated mice increased the CD4-positive T cells in lung tumour tissues. In summary, these results suggested that ECA inhibits B7-H4 expression via STAT3 inhibition, leading to SPC/TGF-β1-induced EMT. Therefore, ECA might be an immune oncological drug for B7-H4-positive cancer, especially lung cancer.
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Go SH, Rho SB, Yang DW, Kim BR, Lee CH, Lee SH. HPV-18 E7 Interacts with Elk-1 Leading to Elevation of the Transcriptional Activity of Elk-1 in Cervical Cancer. Biomol Ther (Seoul) 2022; 30:593-602. [PMID: 36305294 PMCID: PMC9622318 DOI: 10.4062/biomolther.2022.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/02/2022] [Accepted: 09/06/2022] [Indexed: 11/29/2022] Open
Abstract
The human papillomavirus (HPV)-18 E7 (E7) oncoprotein is a major transforming protein that is thought to be involved in the development of cervical cancer. It is well-known that E7 stimulates tumour development by inactivating pRb. However, this alone cannot explain the various characteristics acquired by HPV infection. Therefore, we examined other molecules that could help explain the acquired cancer properties during E7-induced cancer development. Using the yeast two-hybrid (Y2H) method, we found that the Elk-1 factor, which is crucial for cell proliferation, invasion, cell survival, anti-apoptotic activity, and cancer development, binds to the E7. By determining which part of E7 binds to which domain of Elk-1 using the Y2H method, it was found that CR2 and CR3 of the E7 and parts 1–206, including the ETS-DNA domain of Elk-1, interact with each other. As a result of their interaction, the transcriptional activity of Elk-1 was increased, thereby increasing the expression of target genes EGR-1, c-fos, and E2F. Additionally, the colony forming assay revealed that overexpression of Elk-1 and E7 promotes C33A cell proliferation. We expect that the discovery of a novel E7 function as an Elk-1 activator could help explain whether the E7 has novel oncogenic activities in addition to p53 inactivation. We also expect that it will offer new methods for developing improved strategies for cervical cancer treatment.
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Affiliation(s)
- Sung-Ho Go
- Department of Life Science, Yong In University, Yongin 17092,
| | - Seung Bae Rho
- Division of Cancer Biology, Research Institute, National Cancer Center, Goyang 10408,
| | - Dong-Wha Yang
- Department of Life Science, Yong In University, Yongin 17092,
| | - Boh-Ram Kim
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Chang Hoon Lee
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Seung-Hoon Lee
- Department of Life Science, Yong In University, Yongin 17092,
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Seo SH, Hwang S, Hwang S, Han S, Park H, Lee Y, Rho SB, Kwon Y. Hypoxia‐induced ELF3 promotes tumor angiogenesis through IGF1/IGF1R. EMBO Rep 2022; 23:e52977. [PMID: 35695065 PMCID: PMC9346469 DOI: 10.15252/embr.202152977] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/09/2022] [Accepted: 05/19/2022] [Indexed: 11/09/2022] Open
Abstract
Epithelial ovarian cancer (EOC) is one of the most lethal gynecological cancers despite a relatively low incidence. Angiogenesis, one of the hallmarks of cancer, is essential for the pathogenesis of EOC, which is related to the induction of angiogenic factors. We found that ELF3 was highly expressed in EOCs under hypoxia and functioned as a transcription factor for IGF1. The ELF3‐mediated increase in the secretion of IGF1 and VEGF promoted endothelial cell proliferation, migration, and EOC angiogenesis. Although this situation was much exaggerated under hypoxia, ELF3 silencing under hypoxia significantly attenuated angiogenic activity in endothelial cells by reducing the expression and secretion of IGF1 and VEGF. ELF3 silencing attenuated angiogenesis and tumorigenesis in ex vivo and xenograft mouse models. Consequently, ELF3 plays an important role in the induction of angiogenesis and tumorigenesis in EOC as a transcription factor of IGF1. A detailed understanding of the biological mechanism of ELF3 may both improve current antiangiogenic therapies and have anticancer effects for EOC.
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Affiliation(s)
- Seung Hee Seo
- College of Pharmacy Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
| | - Soo‐Yeon Hwang
- College of Pharmacy Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
| | - Seohui Hwang
- College of Pharmacy Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
| | - Sunjung Han
- College of Pharmacy Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
| | - Hyojin Park
- College of Pharmacy Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
| | - Yun‐Sil Lee
- College of Pharmacy Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
| | - Seung Bae Rho
- Research Institute National Cancer Center Goyang‐si Gyeonggi‐do Korea
| | - Youngjoo Kwon
- College of Pharmacy Graduate School of Pharmaceutical Sciences Ewha Womans University Seoul Korea
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7
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Kang GJ, Park JH, Kim HJ, Kim EJ, Kim B, Byun HJ, Yu L, Nguyen TM, Nguyen TH, Kim KS, Huy HP, Rahman M, Kim YH, Jang JY, Park MK, Lee H, Choi CI, Lee K, Han HK, Cho J, Rho SB, Lee CH. PRR16/Largen Induces Epithelial-Mesenchymal Transition through the Interaction with ABI2 Leading to the Activation of ABL1 Kinase. Biomol Ther (Seoul) 2022; 30:340-347. [PMID: 35719027 PMCID: PMC9252882 DOI: 10.4062/biomolther.2022.066] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Revised: 05/28/2022] [Accepted: 06/01/2022] [Indexed: 11/28/2022] Open
Abstract
Advanced or metastatic breast cancer affects multiple organs and is a leading cause of cancer-related death. Cancer metastasis is associated with epithelial-mesenchymal metastasis (EMT). However, the specific signals that induce and regulate EMT in carcinoma cells remain unclear. PRR16/Largen is a cell size regulator that is independent of mTOR and Hippo signalling pathways. However, little is known about the role PRR16 plays in the EMT process. We found that the expression of PRR16 was increased in mesenchymal breast cancer cell lines. PRR16 overexpression induced EMT in MCF7 breast cancer cells and enhances migration and invasion. To determine how PRR16 induces EMT, the binding proteins for PRR16 were screened, revealing that PRR16 binds to Abl interactor 2 (ABI2). We then investigated whether ABI2 is involved in EMT. Gene silencing of ABI2 induces EMT, leading to enhanced migration and invasion. ABI2 is a gene that codes for a protein that interacts with ABL proto-oncogene 1 (ABL1) kinase. Therefore, we investigated whether the change in ABI2 expression affected the activation of ABL1 kinase. The knockdown of ABI2 and PRR16 overexpression increased the phosphorylation of Y412 in ABL1 kinase. Our results suggest that PRR16 may be involved in EMT by binding to ABI2 and interfering with its inhibition of ABL1 kinase. This indicates that ABL1 kinase inhibitors may be potential therapeutic agents for the treatment of PRR16-related breast cancer.
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Affiliation(s)
- Gyeoung Jin Kang
- Lillehei Heart Institute, University of Minnesota, Minneapolis, MN 55455, USA
| | - Jung Ho Park
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Hyun Ji Kim
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Eun Ji Kim
- Lillehei Heart Institute, University of Minnesota, Minneapolis, MN 55455, USA
| | - Boram Kim
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Hyun Jung Byun
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Lu Yu
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Tuan Minh Nguyen
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Thi Ha Nguyen
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Kyung Sung Kim
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Hiệu Phùng Huy
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Mostafizur Rahman
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Ye Hyeon Kim
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Ji Yun Jang
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea.,National Cancer Center, Goyang 10408, Republic of Korea
| | - Mi Kyung Park
- National Cancer Center, Goyang 10408, Republic of Korea
| | - Ho Lee
- National Cancer Center, Goyang 10408, Republic of Korea
| | - Chang Ick Choi
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Kyeong Lee
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Hyo Kyung Han
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Jungsook Cho
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
| | - Seung Bae Rho
- National Cancer Center, Goyang 10408, Republic of Korea
| | - Chang Hoon Lee
- College of Pharmacy, Dongguk University, Goyang 10326, Republic of Korea
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Rho SB, Byun HJ, Kim BR, Lee CH. Snail Promotes Cancer Cell Proliferation via Its Interaction with the BIRC3. Biomol Ther (Seoul) 2022; 30:380-388. [PMID: 35711139 PMCID: PMC9252879 DOI: 10.4062/biomolther.2022.063] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 05/22/2022] [Accepted: 05/28/2022] [Indexed: 11/23/2022] Open
Abstract
Snail is implicated in tumour growth and metastasis and is up-regulated in various human tumours. Although the role of Snails in epithelial-mesenchymal transition, which is particularly important in cancer metastasis, is well known, how they regulate tumour growth is poorly described. In this study, the possible molecular mechanisms of Snail in tumour growth were explored. Baculoviral inhibitor of apoptosis protein (IAP) repeat-containing protein 3 (BIRC3), a co-activator of cell proliferation during tumourigenesis, was identified as a Snail-binding protein via a yeast two-hybrid system. Since BIRC3 is important for cell survival, the effect of BIRC3 binding partner Snail on cell survival was investigated in ovarian cancer cell lines. Results revealed that Bax expression was activated, while the expression levels of anti-apoptotic proteins were markedly decreased by small interfering RNA (siRNA) specific for Snail (siSnail). siSnail, the binding partner of siBIRC3, activated the tumour suppressor function of p53 by promoting p53 protein stability. Conversely, BIRC3 could interact with Snail, for this reason, the possibility of BIRC3 involvement in EMT was investigated. BIRC3 overexpression resulted in a decreased expression of the epithelial marker and an increased expression of the mesenchymal markers. siSnail or siBIRC3 reduced the mRNA levels of matrix metalloproteinase (MMP)-2 and MMP-9. These results provide evidence that Snail promotes cell proliferation by interacting with BIRC3 and that BIRC3 might be involved in EMT via binding to Snail in ovarian cancer cells. Therefore, our results suggested the novel relevance of BIRC3, the binding partner of Snail, in ovarian cancer development.
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Affiliation(s)
- Seung Bae Rho
- Division of Cancer Biology, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
| | - Hyun-Jung Byun
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul/Goyang 04620, Republic of Korea
| | - Boh-Ram Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul/Goyang 04620, Republic of Korea
| | - Chang Hoon Lee
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul/Goyang 04620, Republic of Korea
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Enkhtaivan E, Kim HJ, Kim B, Byun HJ, Yu L, Nguyen TM, Nguyen TH, Do PA, Kim EJ, Kim KS, Huy HP, Rahman M, Jang JY, Rho SB, Lee H, Kang GJ, Park MK, Kim NH, Choi CI, Lee K, Han HK, Cho J, Lee AY, Lee CH. Loss of EMP2 Inhibits Melanogenesis of MNT1 Melanoma Cells via Regulation of TRP-2. Biomol Ther (Seoul) 2022; 30:203-211. [PMID: 35221300 PMCID: PMC8902453 DOI: 10.4062/biomolther.2022.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 02/07/2022] [Accepted: 02/07/2022] [Indexed: 01/10/2023] Open
Abstract
Melanogenesis is the production of melanin from tyrosine by a series of enzyme-catalyzed reactions, in which tyrosinase and DOPA oxidase play key roles. The melanin content in the skin determines skin pigmentation. Abnormalities in skin pigmentation lead to various skin pigmentation disorders. Recent research has shown that the expression of EMP2 is much lower in melanoma than in normal melanocytes, but its role in melanogenesis has not yet been elucidated. Therefore, we investigated the role of EMP2 in the melanogenesis of MNT1 human melanoma cells. We examined TRP-1, TRP-2, and TYR expression levels during melanogenesis in MNT1 melanoma cells by gene silencing of EMP2. Western blot and RT-PCR results confirmed that the expression levels of TYR and TRP-2 were decreased when EMP2 expression was knocked down by EMP2 siRNA in MNT1 cells, and these changes were reversed when EMP2 was overexpressed. We verified the EMP2 gene was knocked out of the cell line (EMP2 CRISPR/Cas9) by using a CRISPR/Cas9 system and found that the expression levels of TRP-2 and TYR were significantly lower in the EMP2 CRISPR/Cas9 cell lines. Loss of EMP2 also reduced migration and invasion of MNT1 melanoma cells. In addition, the melanosome transfer from the melanocytes to keratinocytes in the EMP2 KO cells cocultured with keratinocytes was reduced compared to the cells in the control coculture group. In conclusion, these results suggest that EMP2 is involved in melanogenesis via the regulation of TRP-2 expression.
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Affiliation(s)
- Enkhmend Enkhtaivan
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Hyun Ji Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Boram Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Hyung Jung Byun
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Lu Yu
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Tuan Minh Nguyen
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Thi Ha Nguyen
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Phuong Anh Do
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Eun Ji Kim
- Lillehei Heart Institute, University of Minnesota, Minneapolis, MN 55455, USA
| | - Kyung Sung Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Hiệu Phùng Huy
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Mostafizur Rahman
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Ji Yun Jang
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea.,National Cancer Center, Goyang 10408, Republic of Korea
| | - Seung Bae Rho
- National Cancer Center, Goyang 10408, Republic of Korea
| | - Ho Lee
- National Cancer Center, Goyang 10408, Republic of Korea
| | - Gyeoung Jin Kang
- Lillehei Heart Institute, University of Minnesota, Minneapolis, MN 55455, USA
| | - Mi Kyung Park
- National Cancer Center, Goyang 10408, Republic of Korea
| | - Nan-Hyung Kim
- Department of Dermatology, Dongguk University Ilsan Hospital, Goyang 10326, Republic of Korea
| | - Chang Ick Choi
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Kyeong Lee
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Hyo Kyung Han
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Jungsook Cho
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
| | - Ai Young Lee
- Department of Dermatology, Dongguk University Ilsan Hospital, Goyang 10326, Republic of Korea
| | - Chang Hoon Lee
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Republic of Korea
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10
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Oh M, Son C, Rho SB, Kim M, Park K, Song SY. Stem Cell Factor SOX9 Interacts with a Cell Death Regulator RIPK1 and Results in Escape of Cancer Stem Cell Death. Cells 2022; 11:cells11030363. [PMID: 35159173 PMCID: PMC8834197 DOI: 10.3390/cells11030363] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/09/2022] [Accepted: 01/13/2022] [Indexed: 12/13/2022] Open
Abstract
High-grade ovarian cancer (HGOC) is the most lethal gynecological cancer, with high metastasis and recurrence. Cancer stem cells (CSCs) are responsible for its apoptosis resistance, cancer metastasis, and recurrence. Thus, targeting CSCs would be a promising strategy for overcoming chemotherapy resistance and improving patient prognosis in HGOC. Among upregulated oncogenic proteins in HGOC, we found that transcription factor SOX9 showed a strong correlation with stemness-regulating ALDH1A1 and was localized predominantly in the cytoplasm of HGOC with lymph node metastasis. In order to address the role of unusual cytoplasmic SOX9 and to explore its underlying mechanism in HGOC malignancy, a Y2H assay was used to identify a necroptotic cell death-associated cytoplasmic protein, receptor-interacting serine/threonine protein kinase 1 (RIPK1), as a novel SOX9-interacting partner and further mapped their respective interacting domains. The C-terminal region containing the transactivation domain of SOX9 interacted with the death domain of R1PK1. Consistent with its stemness-promoting function, SOX9 knockdown in vitro resulted in changes in cell morphology, cell cycle, stem cell marker expression, cell invasion, and sphere formation. Furthermore, in vivo knockdown completely inhibited tumor growth in mouse xenograft model. We propose that cytoplasmic SOX9-mediated cell death suppression would contribute to cancer stem cell survival in HGOC.
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Affiliation(s)
- Mijung Oh
- Medical Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea; (M.O.); (C.S.)
- Department of Pathology and Translational Genomics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea;
| | - Chaeyeon Son
- Medical Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea; (M.O.); (C.S.)
| | - Seung Bae Rho
- Division of Translational Science, Research Institute, National Cancer Center, Goyang 10408, Korea;
| | - Minjeong Kim
- Department of Pathology and Translational Genomics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea;
| | - Kyoungsook Park
- Medical Research Center, Sungkyunkwan University School of Medicine, Suwon 16419, Korea; (M.O.); (C.S.)
- Department of Pathology and Translational Genomics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea;
- Correspondence: (K.P.); (S.Y.S.); Tel.: +82-10-8718-3625 (K.P.); +82-10-9933-2803 (S.Y.S.)
| | - Sang Yong Song
- Department of Pathology and Translational Genomics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea;
- Correspondence: (K.P.); (S.Y.S.); Tel.: +82-10-8718-3625 (K.P.); +82-10-9933-2803 (S.Y.S.)
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11
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Kim HJ, Kim B, Byun HJ, Yu L, Nguyen TM, Nguyen TH, Do PA, Kim EJ, Cheong KA, Kim KS, Huy Phùng H, Rahman M, Jang JY, Rho SB, Kang GJ, Park MK, Lee H, Lee K, Cho J, Han HK, Kim SG, Lee AY, Lee CH. Resolvin D1 Suppresses H 2O 2-Induced Senescence in Fibroblasts by Inducing Autophagy through the miR-1299/ARG2/ARL1 Axis. Antioxidants (Basel) 2021; 10:1924. [PMID: 34943028 PMCID: PMC8750589 DOI: 10.3390/antiox10121924] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 11/24/2021] [Accepted: 11/28/2021] [Indexed: 12/15/2022] Open
Abstract
ARG2 has been reported to inhibit autophagy in vascular endothelial cells and keratinocytes. However, studies of its mechanism of action, its role in skin fibroblasts, and the possibility of promoting autophagy and inhibiting cellular senescence through ARG2 inhibition are lacking. We induced cellular senescence in dermal fibroblasts by using H2O2. H2O2-induced fibroblast senescence was inhibited upon ARG2 knockdown and promoted upon ARG2 overexpression. The microRNA miR-1299 suppressed ARG2 expression, thereby inhibiting fibroblast senescence, and miR-1299 inhibitors promoted dermal fibroblast senescence by upregulating ARG2. Using yeast two-hybrid assay, we found that ARG2 binds to ARL1. ARL1 knockdown inhibited autophagy and ARL1 overexpression promoted it. Resolvin D1 (RvD1) suppressed ARG2 expression and cellular senescence. These data indicate that ARG2 stimulates dermal fibroblast cell senescence by inhibiting autophagy after interacting with ARL1. In addition, RvD1 appears to promote autophagy and inhibit dermal fibroblast senescence by inhibiting ARG2 expression. Taken together, the miR-1299/ARG2/ARL1 axis emerges as a novel mechanism of the ARG2-induced inhibition of autophagy. Furthermore, these results indicate that miR-1299 and pro-resolving lipids, including RvD1, are likely involved in inhibiting cellular senescence by inducing autophagy.
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Affiliation(s)
- Hyun Ji Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Boram Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Hyung Jung Byun
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Lu Yu
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Tuan Minh Nguyen
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Thi Ha Nguyen
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Phuong Anh Do
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Eun Ji Kim
- Lillehei Heart Institute, University of Minnesota, Minneapolis, MN 55455, USA;
| | - Kyung Ah Cheong
- Department of Dermatology, Dongguk University Ilsan Hospital, 814 Siksa-dong, Ilsandong-gu, Goyang-si 10326, Korea; (K.A.C.); (G.J.K.); (A.Y.L.)
| | - Kyung Sung Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Hiệu Huy Phùng
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Mostafizur Rahman
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Ji Yun Jang
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
- National Cancer Center, Goyang 10408, Korea; (S.B.R.); (H.L.)
| | - Seung Bae Rho
- National Cancer Center, Goyang 10408, Korea; (S.B.R.); (H.L.)
| | - Gyeoung Jin Kang
- Lillehei Heart Institute, University of Minnesota, Minneapolis, MN 55455, USA;
| | - Mi Kyung Park
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
- National Cancer Center, Goyang 10408, Korea; (S.B.R.); (H.L.)
| | - Ho Lee
- National Cancer Center, Goyang 10408, Korea; (S.B.R.); (H.L.)
| | - Kyeong Lee
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Jungsook Cho
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Hyo Kyung Han
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Sang Geon Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
| | - Ai Young Lee
- Department of Dermatology, Dongguk University Ilsan Hospital, 814 Siksa-dong, Ilsandong-gu, Goyang-si 10326, Korea; (K.A.C.); (G.J.K.); (A.Y.L.)
| | - Chang Hoon Lee
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 04620, Korea; (H.J.K.); (B.K.); (H.J.B.); (L.Y.); (T.M.N.); (T.H.N.); (P.A.D.); (K.S.K.); (H.H.P.); (M.R.); (J.Y.J.); (M.K.P.); (K.L.); (J.C.); (H.K.H.); (S.G.K.)
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12
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Rho SB, Byun HJ, Kim BR, Lee CH. Knockdown of LKB1 Sensitizes Endometrial Cancer Cells via AMPK Activation. Biomol Ther (Seoul) 2021; 29:650-657. [PMID: 34607979 PMCID: PMC8551729 DOI: 10.4062/biomolther.2021.131] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 08/31/2021] [Accepted: 09/07/2021] [Indexed: 12/19/2022] Open
Abstract
Metformin is an anti-diabetic drug and has anticancer effects on various cancers. Several studies have suggested that metformin reduces cell proliferation and stimulates cell-cycle arrest and apoptosis. However, the definitive molecular mechanism of metformin in the pathophysiological signaling in endometrial tumorigenesis and metastasis is not clearly understood. In this study, we examined the effects of metformin on the cell viability and apoptosis of human cervical HeLa and endometrial HEC-1-A and KLE cancer cells. Metformin suppressed cell growth in a dose-dependent manner and dramatically evoked apoptosis in HeLa cervical cancer cells, while apoptotic cell death and growth inhibition were not observed in endometrial (HEC-1-A, KLE) cell lines. Accordingly, the p27 and p21 promoter activities were enhanced while Bcl-2 and IL-6 activities were significantly reduced by metformin treatment. Metformin diminished the phosphorylation of mTOR, p70S6K and 4E-BP1 by accelerating adenosine monophosphateactivated kinase (AMPK) in HeLa cancer cells, but it did not affect other cell lines. To determine why the anti-proliferative effects are observed only in HeLa cells, we examined the expression level of liver kinase B1 (LKB1) since metformin and LKB1 share the same signalling system, and we found that the LKB1 gene is not expressed only in HeLa cancer cells. Consistently, the overexpression of LKB1 in HeLa cancer cells prevented metformin-triggered apoptosis while LKB1 knockdown significantly increased apoptosis in HEC-1-A and KLE cancer cells. Taken together, these findings indicate an underlying biological/physiological molecular function specifically for metformin-triggered apoptosis dependent on the presence of the LKB1 gene in tumorigenesis.
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Affiliation(s)
- Seung Bae Rho
- Division of Translational Science, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
| | - Hyun Jung Byun
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Republic of Korea
| | - Boh-Ram Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Republic of Korea
| | - Chang Hoon Lee
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Republic of Korea
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Rho SB, Lee KW, Lee SH, Byun HJ, Kim BR, Lee CH. Novel Anti-Angiogenic and Anti-Tumour Activities of the N-Terminal Domain of NOEY2 via Binding to VEGFR-2 in Ovarian Cancer. Biomol Ther (Seoul) 2021; 29:506-518. [PMID: 34462379 PMCID: PMC8411030 DOI: 10.4062/biomolther.2021.121] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 07/30/2021] [Accepted: 08/03/2021] [Indexed: 12/12/2022] Open
Abstract
The imprinted tumour suppressor NOEY2 is downregulated in various cancer types, including ovarian cancers. Recent data suggest that NOEY2 plays an essential role in regulating the cell cycle, angiogenesis and autophagy in tumorigenesis. However, its detailed molecular function and mechanisms in ovarian tumours remain unclear. In this report, we initially demonstrated the inhibitory effect of NOEY2 on tumour growth by utilising a xenograft tumour model. NOEY2 attenuated the cell growth approximately fourfold and significantly reduced tumour vascularity. NOEY2 inhibited the phosphorylation of the signalling components downstream of phosphatidylinositol-3'-kinase (PI3K), including phosphoinositide-dependent protein kinase 1 (PDK-1), tuberous sclerosis complex 2 (TSC-2) and p70 ribosomal protein S6 kinase (p70S6K), during ovarian tumour progression via direct binding to vascular endothelial growth factor receptor-2 (VEGFR-2). Particularly, the N-terminal domain of NOEY2 (NOEY2-N) had a potent anti-angiogenic activity and dramatically downregulated VEGF and hypoxia-inducible factor-1α (HIF-1α), key regulators of angiogenesis. Since no X-ray or nuclear magnetic resonance structures is available for NOEY2, we constructed the threedimensional structure of this protein via molecular modelling methods, such as homology modelling and molecular dynamic simulations. Thereby, Lys15 and Arg16 appeared as key residues in the N-terminal domain. We also found that NOEY2-N acts as a potent inhibitor of tumorigenesis and angiogenesis. These findings provide convincing evidence that NOEY2-N regulates endothelial cell function and angiogenesis by interrupting the VEGFR-2/PDK-1/GSK-3β signal transduction and thus strongly suggest that NOEY2-N might serve as a novel anti-tumour and anti-angiogenic agent against many diseases, including ovarian cancer.
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Affiliation(s)
- Seung Bae Rho
- Division of Translational Science, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
| | - Keun Woo Lee
- Department of Biochemistry, Division of Applied Life Science, Environmental Biotechnology National Core Research Center, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Seung-Hoon Lee
- Department of Life Science, Yong In University, Yongin 17092, Republic of Korea
| | - Hyun Jung Byun
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Republic of Korea
| | - Boh-Ram Kim
- Division of Translational Science, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea.,BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Republic of Korea
| | - Chang Hoon Lee
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Republic of Korea
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14
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Lee EJ, Cho M, Rho SB, Park J, Chae DA, Nguyen QTT. β-TrCP1-variant 4, a novel splice variant of β-TrCP1, is a negative regulator of β-TrCP1-variant 1 in β-catenin degradation. Biochem Biophys Res Commun 2021; 542:9-16. [PMID: 33482471 DOI: 10.1016/j.bbrc.2021.01.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 01/03/2021] [Indexed: 10/22/2022]
Abstract
β-transducin repeats-containing protein-1 (β-TrCP1) serves as the substrate recognition subunit for SCFβ-TrCP E3 ubiquitin ligases, which specifically ubiquitinate phosphorylated substrates. Three variants of β-TrCP1 are known and act as homodimer or heterodimer complexes. Here, we identified a novel full-sequenced variant, β-TrCP1-variant 4, which harbours exon II instead of exon III of variant 1, with no change in the open reading frame. The expression of β-TrCP1-variant 4 is lower than that of variant 1 or 2 in ovarian cancer cell lines, whereas it is abundantly expressed in normal and cancerous ovarian tissues. Moreover, β-TrCP1-variant 2 was aberrantly expressed more than variant 1 in ovarian cancer tissues whereas variant 1 was expressed more in normal tissues. Similar to variants 1 and 2, β-TrCP1-variant 4 directly interacts with β-catenin, one of the substrates of SCFβ-TrCP E3 ubiquitin ligase and down-regulates the transcriptional activity and protein expression of β-catenin with a significantly weaker effect than that by variants 1 and 2. However, the co-expression of β-TrCP1-variant 4 with variant 1 in same proportion has no effect, whereas other combinations effectively down-regulate the activity of β-catenin, indicating that the heterodimer of variants 1 and 4 has no function. Thus, β-TrCP1-variant 4 could play a critical role in SCFβ-TrCP E3 ligase-mediated ubiquitination by acting as a negative regulator of β-TrCP1-variant 1.
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Affiliation(s)
- Eun-Ju Lee
- Department of Obstetrics and Gynecology, Chung-Ang University School of Medicine, Chung-Ang University Hospital, Seoul, Republic of Korea.
| | - Minji Cho
- Department of Obstetrics and Gynecology, Chung-Ang University School of Medicine, Chung-Ang University Hospital, Seoul, Republic of Korea.
| | - Seung Bae Rho
- Research Institute, National Cancer Center, Goyang-si, Republic of Korea.
| | - Junsoo Park
- Division of Biological Science and Technology, Yonsei University, Wonju, Republic of Korea.
| | - Dhan-Ah Chae
- Department of Obstetrics and Gynecology, Chung-Ang University School of Medicine, Chung-Ang University Hospital, Seoul, Republic of Korea.
| | - Que Thanh Thanh Nguyen
- Department of Obstetrics and Gynecology, Chung-Ang University School of Medicine, Chung-Ang University Hospital, Seoul, Republic of Korea.
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15
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Yu L, Kim HJ, Park MK, Byun HJ, Kim EJ, Kim B, Nguyen MT, Kim JH, Kang GJ, Lee H, Kim SY, Rho SB, Lee CH. Ethacrynic acid, a loop diuretic, suppresses epithelial-mesenchymal transition of A549 lung cancer cells via blocking of NDP-induced WNT signaling. Biochem Pharmacol 2020; 183:114339. [PMID: 33189676 DOI: 10.1016/j.bcp.2020.114339] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 11/02/2020] [Accepted: 11/10/2020] [Indexed: 12/20/2022]
Abstract
Lung cancer is one of the leading causes of death in cancer patients. Epithelial-mesenchymal transition (EMT) plays an important role in lung cancer progression. Therefore, for lung cancer treatment, it is crucial to find substances that inhibit EMT. Ethacrynic acid (ECA) is a diuretic that inhibits cellular ion flux and exerts anticancer effects. However, the effects of ECA on EMT in lung cancer remain unclear. We examined the effects of ECA on sphingosylphosphorylcholine (SPC) or TGF-β1-induced EMT process in A549 and H1299 cells via reverse transcription polymerase chain reaction and Western blotting. We found that ECA inhibited SPC-induced EMT and SPC-induced WNT signalling in EMT. We observed that SPC induces the expression of NDP [Norrie disease protein] and WNT-2, whereas ECA suppressed their expression. SPC-induced WNT activation, EMT, migration, and invasion were suppressed by NDP small-interfering RNA (siNDP), but NDP overexpression (pNDP) enhanced these events in A549 and H1299 cells. Accordingly, NDP expression may influence lung cancer prognosis. In summary, our results revealed that ECA inhibited SPC or TGF-β1-induced EMT in A549 and H1299 lung cancer cells by downregulating NDP expression and inhibiting WNT activation. Therefore, ECA might be a new drug candidate for lung cancer treatment.
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Affiliation(s)
- Lu Yu
- College of Pharmacy, Dongguk University, Seoul 100-715, Republic of Korea
| | - Hyun Ji Kim
- College of Pharmacy, Dongguk University, Seoul 100-715, Republic of Korea
| | - Mi Kyung Park
- National Cancer Center, Goyang 10408, Republic of Korea
| | - Hyun Jung Byun
- College of Pharmacy, Dongguk University, Seoul 100-715, Republic of Korea
| | - Eun Ji Kim
- College of Pharmacy, Dongguk University, Seoul 100-715, Republic of Korea
| | - Boram Kim
- College of Pharmacy, Dongguk University, Seoul 100-715, Republic of Korea
| | - Minh Tuan Nguyen
- College of Pharmacy, Dongguk University, Seoul 100-715, Republic of Korea
| | - Ji Hyun Kim
- College of Pharmacy, Dongguk University, Seoul 100-715, Republic of Korea
| | - Gyeoung Jin Kang
- Lillehei Heart Institute, University of Minnesota, Minneapolis, MN, USA
| | - Ho Lee
- National Cancer Center, Goyang 10408, Republic of Korea
| | - Soo Youl Kim
- National Cancer Center, Goyang 10408, Republic of Korea
| | - Seung Bae Rho
- National Cancer Center, Goyang 10408, Republic of Korea.
| | - Chang Hoon Lee
- College of Pharmacy, Dongguk University, Seoul 100-715, Republic of Korea.
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16
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Rho SB, Lee SH, Byun HJ, Kim BR, Lee CH. IRF-1 Inhibits Angiogenic Activity of HPV16 E6 Oncoprotein in Cervical Cancer. Int J Mol Sci 2020; 21:ijms21207622. [PMID: 33076322 PMCID: PMC7589982 DOI: 10.3390/ijms21207622] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 10/13/2020] [Indexed: 12/15/2022] Open
Abstract
HPV16 E6 oncoprotein is a member of the human papillomavirus (HPV) family that contributes to enhanced cellular proliferation and risk of cervical cancer progression via viral infection. In this study, interferon regulatory factor-1 (IRF-1) regulates cell growth inhibition and transcription factors in immune response, and acts as an HPV16 E6-binding cellular molecule. Over-expression of HPV16 E6 elevated cell growth by attenuating IRF-1-induced apoptosis and repressing p21 and p53 expression, but activating cyclin D1 and nuclear factor kappa B (NF-κB) expression. The promoter activities of p21 and p53 were suppressed, whereas NF-κB activities were increased by HPV16 E6. Additionally, the cell viability of HPV16 E6 was diminished by IRF-1 in a dose-dependent manner. We found that HPV16 E6 activated vascular endothelial growth factor (VEGF)-induced endothelial cell migration and proliferation as well as phosphorylation of VEGFR-2 via direct interaction in vitro. HPV16 E6 exhibited potent pro-angiogenic activity and clearly enhanced the levels of hypoxia-inducible factor-1α (HIF-1α). By contrast, the loss of function of HPV16 E6 by siRNA-mediated knockdown inhibited the cellular events. These data provide direct evidence that HPV16 E6 facilitates tumour growth and angiogenesis. HPV16 E6 also activates the PI3K/mTOR signalling cascades, and IRF-1 suppresses HPV16 E6-induced tumourigenesis and angiogenesis. Collectively, these findings suggest a biological mechanism underlying the HPV16 E6-related activity in cervical tumourigenesis.
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Affiliation(s)
- Seung Bae Rho
- Division of Translational Science, Research Institute, National Cancer Center, Goyang, Gyeonggido 411-769, Korea;
| | - Seung-Hoon Lee
- Department of Life Science, Yong In University, Yongin, Gyeonggido 449-714, Korea;
| | - Hyun-Jung Byun
- Phamaceutical Biochemistry, College of Pharmacy and Integrated Research Institute for Drug, Dongguk University, Goyang 100-715, Korea;
| | - Boh-Ram Kim
- Phamaceutical Biochemistry, College of Pharmacy and Integrated Research Institute for Drug, Dongguk University, Goyang 100-715, Korea;
- Correspondence: (B.-R.K.); (C.H.L.); Tel.: +82-31-961-5213 (B.-R.K. & C.H.L.)
| | - Chang Hoon Lee
- Phamaceutical Biochemistry, College of Pharmacy and Integrated Research Institute for Drug, Dongguk University, Goyang 100-715, Korea;
- Correspondence: (B.-R.K.); (C.H.L.); Tel.: +82-31-961-5213 (B.-R.K. & C.H.L.)
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Kim AR, Sung JY, Rho SB, Kim YN, Yoon K. Suppressor of Variegation 3-9 Homolog 2, a Novel Binding Protein of Translationally Controlled Tumor Protein, Regulates Cancer Cell Proliferation. Biomol Ther (Seoul) 2019; 27:231-239. [PMID: 30763986 PMCID: PMC6430221 DOI: 10.4062/biomolther.2019.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 02/07/2019] [Accepted: 02/07/2019] [Indexed: 12/23/2022] Open
Abstract
Suppressor of Variegation 3-9 Homolog 2 (SUV39H2) methylates the lysine 9 residue of histone H3 and induces heterochromatin formation, resulting in transcriptional repression or silencing of target genes. SUV39H1 and SUV39H2 have a role in embryonic development, and SUV39H1 was shown to suppress cell cycle progression associated with Rb. However, the function of human SUV39H2 has not been extensively studied. We observed that forced expression of SUV39H2 decreased cell proliferation by inducing G1 cell cycle arrest. In addition, SUV39H2 was degraded through the ubiquitin-proteasomal pathway. Using yeast two-hybrid screening to address the degradation mechanism and function of SUV39H2, we identified translationally controlled tumor protein (TCTP) as an SUV39H2-interacting molecule. Mapping of the interacting regions indicated that the N-terminal 60 amino acids (aa) of full-length SUV39H2 and the C-terminus of TCTP (120-172 aa) were critical for binding. The interaction of SUV39H2 and TCTP was further confirmed by co-immunoprecipitation and immunofluorescence staining for colocalization. Moreover, depletion of TCTP by RNAi led to up-regulation of SUV39H2 protein, while TCTP overexpression reduced SUV39H2 protein level. The half-life of SUV39H2 protein was significantly extended upon TCTP depletion. These results clearly indicate that TCTP negatively regulates the expression of SUV39H2 post-translationally. Furthermore, SUV39H2 induced apoptotic cell death in TCTP-knockdown cells. Taken together, we identified SUV39H2, as a novel target protein of TCTP and demonstrated that SUV39H2 regulates cell proliferation of lung cancer cells.
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Affiliation(s)
- A-Reum Kim
- Division of Translational Science, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
| | - Jee Young Sung
- Division of Clinical Research, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
| | - Seung Bae Rho
- Division of Translational Science, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
| | - Yong-Nyun Kim
- Division of Translational Science, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
| | - Kyungsil Yoon
- Division of Translational Science, Research Institute, National Cancer Center, Goyang 10408, Republic of Korea
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Cho MJ, Lee JY, Shin MG, Kim HJ, Choi YJ, Rho SB, Kim BR, Jang IS, Lee SH. TSC-22 inhibits CSF-1R function and induces apoptosis in cervical cancer. Oncotarget 2017; 8:97990-98003. [PMID: 29228668 PMCID: PMC5716708 DOI: 10.18632/oncotarget.20296] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 07/18/2017] [Indexed: 12/20/2022] Open
Abstract
Colony stimulating factor 1 receptor (CSF-1R) regulates the monocyte/macrophage system, which is an essential component of cancer development. Therefore, CSF-1R might be an effective target for anti-cancer therapy. The overexpression of transforming growth factor (TGF)-β stimulated clone-22 (TSC-22) inhibits cancer cell proliferation and induces apoptosis, and TSC-22 is emerging as a key factor in tumorigenesis. In this study, we discovered CSF-1R as a new interacting partner of TSC-22 and identified its elevated expression in cervical cancer cells. In particular, we found that TSC-22 interacted with the intracellular tyrosine kinase insert domain (539–749) of CSF-1R, which activates the AKT and ERK signaling pathways. This binding blocked AKT and ERK signaling, thereby suppressing the transcriptional activity of NF-κB. The overexpression of TSC-22 significantly decreased CSF-1R protein levels, affecting their autocrine loop. TSC-22 injected into a xenograft mouse model of human cervical cancer markedly inhibited tumor growth. The reduction of CSF-1R protein significantly suppresses cervical cancer cell proliferation and motility and induces apoptotic cell death. This association between TSC-22 and CSF-1R could be used as a novel therapeutic target and prognostic marker for cervical cancer.
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Affiliation(s)
- Min-Ji Cho
- Department of Life Science, YongIn University, Yonginsi, Korea
| | - Ji-Yeon Lee
- Department of Life Science, YongIn University, Yonginsi, Korea
| | - Min-Gwan Shin
- Department of Life Science, YongIn University, Yonginsi, Korea
| | - Hyun-Ji Kim
- Department of Life Science, YongIn University, Yonginsi, Korea
| | - Yu-Joung Choi
- Department of Life Science, YongIn University, Yonginsi, Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, Goyang-si, Korea
| | - Boh-Ram Kim
- Research Institute, National Cancer Center, Goyang-si, Korea
| | - Ik Soon Jang
- Division of Bioconvergence, Korea Basic Science Institute, Daejeon, Korea
| | - Seung-Hoon Lee
- Department of Life Science, YongIn University, Yonginsi, Korea
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Lee JY, Kim HJ, Rho SB, Lee SH. Correction: eIF3f reduces tumor growth by directly interrupting clusterin with anti-apoptotic property in cancer cells. Oncotarget 2017; 8:36930. [PMID: 28571123 PMCID: PMC5482708 DOI: 10.18632/oncotarget.18267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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20
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Song KH, Woo SR, Chung JY, Lee HJ, Oh SJ, Hong SO, Shim J, Kim YN, Rho SB, Hong SM, Cho H, Hibi M, Bae DJ, Kim SY, Kim MG, Kim TW, Bae YK. REP1 inhibits FOXO3-mediated apoptosis to promote cancer cell survival. Cell Death Dis 2017; 8:e2536. [PMID: 28055019 PMCID: PMC5386371 DOI: 10.1038/cddis.2016.462] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 11/29/2016] [Accepted: 12/07/2016] [Indexed: 01/15/2023]
Abstract
Rab escort protein 1 (REP1) is a component of Rab geranyl-geranyl transferase 2 complex. Mutations in REP1 cause a disease called choroideremia (CHM), which is an X-linked eye disease. Although it is postulated that REP1 has functions in cell survival or death of various tissues in addition to the eye, how REP1 functions in normal and cancer cells remains to be elucidated. Here, we demonstrated that REP1 is required for the survival of intestinal cells in addition to eyes or a variety of cells in zebrafish, and also has important roles in tumorigenesis. Notably, REP1 is highly expressed in colon cancer tissues and cell lines, and silencing of REP1 sensitizes colon cancer cells to serum starvation- and 5-FU-induced apoptosis. In an effort to elucidate the molecular mechanisms underlying REP1-mediated cell survival under those stress conditions, we identified FOXO3 as a binding partner of REP1 using a yeast two-hybrid (Y2H) assay system, and we demonstrated that REP1 blocked the nuclear trans-localization of FOXO3 through physically interacting with FOXO3, thereby suppressing FOXO3-mediated apoptosis. Importantly, the inhibition of REP1 combined with 5-FU treatment could lead to significant retarded tumor growth in a xenograft tumor model of human cancer cells. Thus, our results suggest that REP1 could be a new therapeutic target in combination treatment for colon cancer patients.
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Affiliation(s)
- Kwon-Ho Song
- Laboratory of Tumor Immunology, Department of Biomedical Sciences, Graduate School of Medicine, Korea University, Seoul, Republic of Korea.,Department of Biochemistry, Korea University College of Medicine, Seoul, Republic of Korea.,Department of Biomedical Sciences, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Seon Rang Woo
- Laboratory of Tumor Immunology, Department of Biomedical Sciences, Graduate School of Medicine, Korea University, Seoul, Republic of Korea.,Department of Biochemistry, Korea University College of Medicine, Seoul, Republic of Korea.,Translational Research Institute for Incurable Diseases, Korea University College of Medicine, Seoul, Republic of Korea
| | - Joon-Yong Chung
- Experimental Pathology Laboratory, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Hyo-Jung Lee
- Laboratory of Tumor Immunology, Department of Biomedical Sciences, Graduate School of Medicine, Korea University, Seoul, Republic of Korea.,Department of Biochemistry, Korea University College of Medicine, Seoul, Republic of Korea.,Department of Biomedical Sciences, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Se Jin Oh
- Laboratory of Tumor Immunology, Department of Biomedical Sciences, Graduate School of Medicine, Korea University, Seoul, Republic of Korea.,Department of Biochemistry, Korea University College of Medicine, Seoul, Republic of Korea.,Department of Biomedical Sciences, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Soon-Oh Hong
- Laboratory of Tumor Immunology, Department of Biomedical Sciences, Graduate School of Medicine, Korea University, Seoul, Republic of Korea.,Department of Biochemistry, Korea University College of Medicine, Seoul, Republic of Korea.,Department of Biomedical Sciences, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Jaegal Shim
- Comparative Biomedicine Research Branch, Research Institute, National Cancer Center, Goyang, Republic of Korea
| | - Yong Nyun Kim
- Comparative Biomedicine Research Branch, Research Institute, National Cancer Center, Goyang, Republic of Korea
| | - Seung Bae Rho
- Gynecologic Cancer Branch, Research Institute, National Cancer Center, Goyang, Republic of Korea
| | - Seung-Mo Hong
- Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
| | - Hanbyoul Cho
- Experimental Pathology Laboratory, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.,Department of Obstetrics and Gynecology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Masahiko Hibi
- Bioscience and Biotechnology Center, Nagoya University, Nagoya, Japan
| | - Dong-Jun Bae
- ASAN Institute for Life Sciences, ASAN Medical Center, Seoul, Republic of Korea
| | - Sang-Yeob Kim
- ASAN Institute for Life Sciences, ASAN Medical Center, Seoul, Republic of Korea.,Department of Convergence Medicine, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Min Gyu Kim
- School of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Tae Woo Kim
- Laboratory of Tumor Immunology, Department of Biomedical Sciences, Graduate School of Medicine, Korea University, Seoul, Republic of Korea.,Department of Biochemistry, Korea University College of Medicine, Seoul, Republic of Korea.,Department of Biomedical Sciences, College of Medicine, Korea University, Seoul, Republic of Korea.,Translational Research Institute for Incurable Diseases, Korea University College of Medicine, Seoul, Republic of Korea
| | - Young-Ki Bae
- Comparative Biomedicine Research Branch, Research Institute, National Cancer Center, Goyang, Republic of Korea
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Kim BR, Kwon Y, Rho SB. BMI-1 interacts with sMEK1 and inactivates sMEK1-induced apoptotic cell death. Oncol Rep 2016; 37:579-586. [PMID: 27878292 DOI: 10.3892/or.2016.5262] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 11/14/2016] [Indexed: 11/05/2022] Open
Abstract
The B lymphoma Mo-MLV insertion region 1 homolog (BMI-1) protein is activated in various types of tumors and associated with cancer development and tumor progression. However, the working role of BMI-1 in cellular signaling is not understood completely. In this study, we revealed one possible biologic mechanism of BMI-1 in cancer progression in vitro using a human ovarian tumor cell system. Suppressor of MEK1 (sMEK1), a pivotal regulator involved in the cellular biological response mechanism, was identified as a BMI-1-binding protein. Ectopic expression of BMI-1 activated cell growth by reducing sMEK1-stimulated apoptotic cell death and suppressing p21, p27 and p53 expression, while enhancing cyclin D1, CDK4 and Bcl-2 expression. The effect of BMI-1 on cell cycle and apoptotic regulatory proteins was also confirmed via silencing of BMI-1 expression. Subsequently, the promoter activities of p21 and p53 were inactivated significantly. However, BMI-1 overexpression noticeably increased Bcl-2 and NF-κB activities. In addition, BMI-1 activated the PI3K/mTOR/4E-BP1 signaling pathways, and sMEK1 significantly inhibited BMI-1-stimulated oncogenesis. These insights provide evidence that BMI-1 activates cell growth and suppresses apoptosis. Collectively, our data indicate that BMI-1 plays a pivotal role in the progression of ovarian cancer, thus representing a novel target for antitumor therapy of ovarian cancer.
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Affiliation(s)
- Boh-Ram Kim
- Research Institute, National Cancer Center, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Youngjoo Kwon
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global Top 5 Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
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22
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Kim BR, Seo SH, Park MS, Lee SH, Kwon Y, Rho SB. sMEK1 inhibits endothelial cell proliferation by attenuating VEGFR-2-dependent-Akt/eNOS/HIF-1α signaling pathways. Oncotarget 2016; 6:31830-43. [PMID: 26378810 PMCID: PMC4741643 DOI: 10.18632/oncotarget.5570] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Accepted: 08/15/2015] [Indexed: 12/31/2022] Open
Abstract
The suppressor of MEK null (sMEK1) protein possesses pro-apoptotic activities. In the current study, we reveal that sMEK1 functions as a novel anti-angiogenic factor by suppressing vascular endothelial growth factor (VEGF)-induced cell proliferation, migration, and capillary-like tubular structure in vitro. In addition, sMEK1 inhibited the phosphorylation of the signaling components up- and downstream of Akt, including phospholipase Cγ1 (PLC-γ1), 3-phosphoinositide-dependent protein kinase 1 (PDK1), endothelial nitric oxide synthetase (eNOS), and hypoxia-inducible factor 1 (HIF-1α) during ovarian tumor progression via binding with vascular endothelial growth factor receptor 2 (VEGFR-2). Furthermore, sMEK1 decreased tumor vascularity and inhibited tumor growth in a xenograft human ovarian tumor model. These results supply convincing evidence that sMEK1 controls endothelial cell function and subsequent angiogenesis by suppressing VEGFR-2-mediated PI3K/Akt/eNOS signaling pathway. Taken together, our results clearly suggest that sMEK1 might be a novel anti-angiogenic and anti-tumor agent for use in ovarian tumor.
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Affiliation(s)
- Boh-Ram Kim
- Research Institute, National Cancer Center, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea.,College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global Top 5 Program, Ewha Womans University, Seoul, Republic of Korea
| | - Seung Hee Seo
- Research Institute, National Cancer Center, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
| | - Mi Sun Park
- Research Institute, National Cancer Center, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
| | - Seung-Hoon Lee
- Department of Life Science, Yong In University, Samga-dong, Cheoin-gu, Yongin-si Gyeonggi-do, Republic of Korea
| | - Youngjoo Kwon
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global Top 5 Program, Ewha Womans University, Seoul, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
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23
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Kim BR, Yoon K, Byun HJ, Seo SH, Lee SH, Rho SB. The anti-tumor activator sMEK1 and paclitaxel additively decrease expression of HIF-1α and VEGF via mTORC1-S6K/4E-BP-dependent signaling pathways. Oncotarget 2015; 5:6540-51. [PMID: 25153728 PMCID: PMC4171649 DOI: 10.18632/oncotarget.2119] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Recently, we found that sMEK1 effectively regulates pro-apoptotic activity when combined with a traditional chemotherapeutic drug. Therefore, combinational therapeutic strategies targeting critical molecular and cellular mechanisms are urgently required. In this present work, we evaluated whether sMEK1 enhanced the pro-apoptotic activity of chemotherapeutic drugs in ovarian carcinoma cells. Combined with a chemotherapeutic drug, sMEK1 showed an additive effect on the suppression of ovarian cancer cell growth by inducing cell cycle arrest and apoptosis and regulating related gene expression levels or protein activities. In addition, the phosphoinositide-3-kinase (PI3K)/Akt/mammalian target of rapamycin (mTOR) pathway was strongly inhibited by the combined treatment, showing de-repression of the tuberous sclerosis complex (TSC) and suppression of ras homolog enriched in the brain (Rheb) and mTOR and raptor in aggressive ovarian carcinoma cells and mouse xenograft models. Treatment with sMEK1 and paclitaxel reduced phosphorylation of ribosomal S6 kinase (S6K) and 4E-binding protein (4E-BP), two critical downstream targets of the mTOR-signaling pathway. Furthermore, both sMEK1 and paclitaxel significantly inhibited the expression of signaling components downstream of S6K/4E-BP, such as hypoxia-inducible factor-1α (HIF-1α) and vascular endothelial growth factor (VEGF), both in vitro and in vivo. Therefore, our data suggest that the combination of sMEK1 and paclitaxel is a promising and effective targeted therapy for chemotherapy-resistant or recurrent ovarian cancers.
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Affiliation(s)
- Boh-Ram Kim
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea; These Authors contributed equally to this work
| | - Kyungsil Yoon
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea; These Authors contributed equally to this work
| | - Hyun-Jung Byun
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
| | - Seung Hee Seo
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
| | - Seung-Hoon Lee
- Department of Life Science, Yong In University, 470, Samga-dong, Cheoin-gu, Yongin-si Gyeonggi-do, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
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Kim BR, Lee EJ, Seo SH, Lee SH, Rho SB. Dickkopf-3 (DKK-3) obstructs VEGFR-2/Akt/mTOR signaling cascade by interacting of β2-microglobulin (β2M) in ovarian tumorigenesis. Cell Signal 2015; 27:2150-9. [PMID: 26278164 DOI: 10.1016/j.cellsig.2015.08.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 08/12/2015] [Indexed: 12/21/2022]
Abstract
In this study, we investigated a possible mechanism of β2-microglobulin (β2M) function in cancer metastases in vitro, using a human ovarian carcinoma cell line. β2M, a modulator acts as a cell growth-promoting and cellular signaling factors, was identified as a dickkopf-3 (DKK-3) interacting protein. We also observed that DKK-3 suppresses endothelial cell angiogenesis of β2M through vascular endothelial growth factor receptor-2 (VEGFR-2) in tumorigenesis. Luciferase activity was remarkably reduced by the transfection of DKK-3 in a dose-dependent manner. In addition, over-expression of β2M activates cell growth by suppressing DKK-3-induced apoptosis. The effect of β2M on cell cycle and apoptosis-regulatory components was also confirmed through the silencing of β2M expression. Furthermore, induction of β2M-mediated VEGFR-2/Akt/mTOR phosphorylation and tumor angiogenesis was significantly suppressed by over-expression of DKK-3. Taken together, our results suggest an underlying mechanism for an increase of β2M-related activity in ovarian tumor cells.
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Affiliation(s)
- Boh-Ram Kim
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Eun-Ju Lee
- Department of Obstetrics and Gynecology, Chung-Ang University School of Medicine, Chung-Ang University Hospital, 224-1, Heuksuk-Dong, Dongjak-Gu, Seoul 156-755, Republic of Korea
| | - Seung Hee Seo
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Seung-Hoon Lee
- Department of Life Science, Yong In University, 470, Samga-dong, Cheoin-gu, Yongin-si, Gyeonggi-do 449-714, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea.
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Park MS, Dong SM, Kim BR, Seo SH, Kang S, Lee EJ, Lee SH, Rho SB. Thioridazine inhibits angiogenesis and tumor growth by targeting the VEGFR-2/PI3K/mTOR pathway in ovarian cancer xenografts. Oncotarget 2015; 5:4929-34. [PMID: 24952635 PMCID: PMC4148111 DOI: 10.18632/oncotarget.2063] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Thioridazine, a member of the phenothiazine family, is a powerful anti-anxiety and anti-psychotic drug. It can also suppress the growth of several types of tumor in vitro. In the current study, we evaluated the direct anti-tumor and anti-angiogenic effects of thioridazine in vivo. The injection of thioridazine into human ovarian tumor xenografts in nude mice significantly inhibited tumor growth by ~fivefold, and also decreased tumor vascularity. In addition, thioridazine inhibited the phosphorylation of the signaling molecules downstream of phosphatidylinositol-3’-kinase (PI3K), including Akt, phosphoinositide-dependent protein kinase 1 (PDK1), and mammalian target of rapamycin (mTOR), during ovarian tumor progression via vascular endothelial growth factor receptor 2 (VEGFR-2). These results provide convincing evidence that thioridazine regulates endothelial cell function and subsequent angiogenesis by inhibiting VEGFR-2/PI3K/mTOR signal transduction. Collectively, these results strongly suggest that thioridazine might be a novel anti-tumor and anti-angiogenic agent for use in ovarian cancer.
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Affiliation(s)
- Mi Sun Park
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
| | | | | | | | | | | | | | - Seung Bae Rho
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
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26
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Park MS, Kim BR, Dong SM, Lee SH, Kim DY, Rho SB. The antihypertension drug doxazosin inhibits tumor growth and angiogenesis by decreasing VEGFR-2/Akt/mTOR signaling and VEGF and HIF-1α expression. Oncotarget 2015; 5:4935-44. [PMID: 24952732 PMCID: PMC4148112 DOI: 10.18632/oncotarget.2064] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Doxazosin is an α1 adrenergic receptor blocker that also exerts antitumor effects. However, the underlying mechanisms by which it modulates PI3K/Akt intracellular signaling are poorly understood. In this study, we reveal that doxazosin functions as a novel antiangiogenic agent by inhibiting vascular endothelial growth factor (VEGF)-induced cell migration and proliferation. It also inhibited VEGF-induced capillary-like structure tube formation in vitro. Doxazosin inhibited the phosphorylation of VEGF receptor-2 (VEGFR-2) and downstream signaling, including PI3K, Akt, 3-phosphoinositide-dependent protein kinase 1 (PDK1), mammalian target of rapamycin (mTOR), and hypoxia-inducible factor 1 (HIF-1α). However, it had no effect on VEGF-induced extracellular signal-regulated kinase 1/2 (ERK1/2) phosphorylation. Furthermore, doxazosin reduced tumor growth and suppressed tumor vascularization in a xenograft human ovarian cancer model. These results provide evidence that doxazosin functions in the endothelial cell system to modulate angiogenesis by inhibiting Akt and mTOR phosphorylation and interacting with VEGFR-2.
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Affiliation(s)
- Mi Sun Park
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyevonggi-do, Republic of Korea; Department of Veterinary Pathology, College of Veterinary Medicine, Seoul National University, 599, Gwanank-ro, Gwanakgu, Seoul, Republic of Korea
| | | | | | | | | | - Seung Bae Rho
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyevonggi-do, Republic of Korea
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Choi CY, Rho SB, Kim HS, Han J, Bae J, Lee SJ, Jung WW, Chun T. The ORF3 protein of porcine circovirus type 2 promotes secretion of IL-6 and IL-8 in porcine epithelial cells by facilitating proteasomal degradation of regulator of G protein signalling 16 through physical interaction. J Gen Virol 2015; 96:1098-1108. [DOI: 10.1099/vir.0.000046] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 01/06/2015] [Indexed: 12/27/2022] Open
Affiliation(s)
- Chang-Yong Choi
- Division of Biotechnology, School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, Goyang-si 410-769, Republic of Korea
| | - Hyun-Sook Kim
- Department of Integrated Biomedical and Life Science, College of Health Science, Korea University, Seoul 136-703, Republic of Korea
| | - Jihye Han
- Division of Biotechnology, School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea
| | - Joonbeom Bae
- Division of Biotechnology, School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea
| | - Suk Jun Lee
- Department of Biomedical Laboratory Science, College of Health Science, Cheongju University, Cheongju-si 360-764, Republic of Korea
| | - Woon-Won Jung
- Department of Biomedical Laboratory Science, College of Health Science, Cheongju University, Cheongju-si 360-764, Republic of Korea
| | - Taehoon Chun
- Division of Biotechnology, School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea
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Kwon HB, Park C, Jeon KH, Lee E, Park SE, Jun KY, Kadayat TM, Thapa P, Karki R, Na Y, Park MS, Rho SB, Lee ES, Kwon Y. A Series of Novel Terpyridine-Skeleton Molecule Derivants Inhibit Tumor Growth and Metastasis by Targeting Topoisomerases. J Med Chem 2015; 58:1100-22. [DOI: 10.1021/jm501023q] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Han-Byeol Kwon
- College
of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global
Top 5 Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Chanmi Park
- College
of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global
Top 5 Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Kyung-Hwa Jeon
- College
of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global
Top 5 Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Eunyoung Lee
- College
of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global
Top 5 Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - So-Eun Park
- College
of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global
Top 5 Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Kyu-Yeon Jun
- College
of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global
Top 5 Program, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Tara Man Kadayat
- College
of Pharmacy, Yeungnam University, Gyeongsan 712-749, Republic of Korea
| | - Pritam Thapa
- College
of Pharmacy, Yeungnam University, Gyeongsan 712-749, Republic of Korea
| | - Radha Karki
- College
of Pharmacy, Yeungnam University, Gyeongsan 712-749, Republic of Korea
| | - Younghwa Na
- College
of Pharmacy, Cha University, Pochon 487-010, Republic of Korea
| | - Mi Sun Park
- Research Institute,
National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Seung Bae Rho
- Research Institute,
National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Eung-Seok Lee
- College
of Pharmacy, Yeungnam University, Gyeongsan 712-749, Republic of Korea
| | - Youngjoo Kwon
- College
of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Global
Top 5 Program, Ewha Womans University, Seoul 120-750, Republic of Korea
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Park MS, Kim BR, Kang S, Kim DY, Rho SB. The antihypertension drug doxazosin suppresses JAK/STATs phosphorylation and enhances the effects of IFN-α/γ-induced apoptosis. Genes Cancer 2015; 5:470-479. [PMID: 25568671 PMCID: PMC4279443 DOI: 10.18632/genesandcancer.37] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Accepted: 10/08/2014] [Indexed: 11/25/2022] Open
Abstract
Doxazosin, a commonly prescribed treatment for patients with benign prostatic hyperplasia, serves as an α1-blocker of the adrenergic receptors. In this study, we calculated its effect on the ovarian carcinoma cells. Doxazosin induces dose-dependent growth suppression and is additively activated through IFN-α or IFN-γ stimulation. They both enhanced G1 phase arrest, as well as the activity of caspase-3, and the reduction of cyclin D1 and CDK4 protein levels. Doxazosin growth suppression was abolished either by the Janus family of tyrosine kinase (JAK) or the signal transducer and activator of transcription (STAT) inhibitor treatment. The activity of JAK/STAT was dependent on the level of doxazosin, suggesting a requirement of doxazosin for the activation of JAK/STAT. Furthermore, doxazosin plus IFN-α or doxazosin plus IFN-γ additively suppressed the activation of the JAK/STAT signals through phosphorylation of JAK and STAT, thus affecting the activation of subsequent downstream signaling components PI3K, mTOR, 70S6K, and PKCδ. In vivo study demonstrated that doxazosin significantly suppressed tumor growth in an ovarian cancer cell xenograft mouse model, inducing apoptotic cell death by up-regulating the expression of p53, whereas c-Myc expression was markedly reduced. Our data indicate that doxazosin can modulate the apoptotic effects of IFN-α- and IFN-γ through the JAK/STAT signaling pathways. Collectively, we indicate that this action may be a potent chemotherapeutic property against ovarian carcinoma.
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Affiliation(s)
- Mi Sun Park
- Research Institute, National Cancer Center, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
| | - Boh-Ram Kim
- Research Institute, National Cancer Center, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
| | - Sokbom Kang
- Research Institute, National Cancer Center, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
| | - Dae-Yong Kim
- Department of Veterinary Pathology, College of Veterinary Medicine, Seoul National University, Gwanak-gu, Seoul, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea
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Kim BR, Dong SM, Seo SH, Lee JH, Lee JM, Lee SH, Rho SB. Lysyl oxidase-like 2 (LOXL2) controls tumor-associated cell proliferation through the interaction with MARCKSL1. Cell Signal 2014; 26:1765-73. [DOI: 10.1016/j.cellsig.2014.05.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 05/15/2014] [Indexed: 01/25/2023]
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Ko YB, Kim BR, Yoon K, Choi EK, Seo SH, Lee Y, Lee MA, Yang JB, Park MS, Rho SB. WIF1 can effectively co-regulate pro-apoptotic activity through the combination with DKK1. Cell Signal 2014; 26:2562-72. [PMID: 25086206 DOI: 10.1016/j.cellsig.2014.07.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 06/26/2014] [Accepted: 07/21/2014] [Indexed: 12/21/2022]
Abstract
Wnt inhibitory factor-1 (WIF1) is a conserved lipid-binding protein that interrupts Wnt ligands by interacting with their Frizzled receptors. Thus, they may suppress the activation of the Wnt/β-catenin triggered signaling cascade. Recently, we found that WIF1 can effectively co-regulate pro-apoptotic activity through the combination with Dickkopf-1 (DKK1). The tumor suppressor p53 protein expression was remarkably increased in the WIF1- and DKK1-transfected cells, along with p21. In contrast, expressions of the anti-apoptotic proteins, c-Myc and Bcl-2, were noticeably reduced. In addition, WIF1 and/or DKK1 significantly activated the transcription of p21 and p53, whereas c-Myc and Bcl-2 activities were remarkably reduced. The tumor suppressor WIF1 was also found to be capable of suppressing tumor growth through the inhibition of tumor angiogenesis in the cellular biological/physiological condition through the targeting of the PI3K/Akt/mTOR signaling pathway, while also being recognized as a Wnt antagonist factor in the Wnt cascade. Consistently, WIF1 conspicuously decreased the VEGF-induced phosphorylation of the PI3K/Akt signaling cascade components, including PDK1, mTOR, TSC-2, GSK-3β, and the p70S6K protein. Collectively, our results indicate for the first time that the tumor suppressor WIF1 is involved in angiogenesis and supplies a possible molecular target for the treatment of distinct malignant cancers, as well as several other associated diseases.
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Affiliation(s)
- Young Bok Ko
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, 282, Munhwa-ro, Jung-gu, Daejeon 301-721, Republic of Korea
| | - Boh-Ram Kim
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Kyungsil Yoon
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Eun Kyung Choi
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Seung Hee Seo
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Yeonah Lee
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, 282, Munhwa-ro, Jung-gu, Daejeon 301-721, Republic of Korea
| | - Min A Lee
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, 282, Munhwa-ro, Jung-gu, Daejeon 301-721, Republic of Korea
| | - Jung Bo Yang
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, 282, Munhwa-ro, Jung-gu, Daejeon 301-721, Republic of Korea
| | - Mi Sun Park
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, 282, Munhwa-ro, Jung-gu, Daejeon 301-721, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea.
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Lee MK, Jeong EM, Kim JH, Rho SB, Lee EJ. Aberrant methylation of the VIM promoter in uterine cervical squamous cell carcinoma. Oncology 2014; 86:359-68. [PMID: 24942637 DOI: 10.1159/000362738] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Accepted: 04/03/2014] [Indexed: 11/19/2022]
Abstract
OBJECTIVES To identify prognosis-associated methylation markers of uterine cervical squamous cell carcinoma (SCC) and to verify potential clinical correlations. METHODS A genome-wide methylation array was performed using tissue samples of stage Ib1 (n = 9) and IIa (n = 5) tumors. Methylation levels were quantitatively evaluated by pyrosequencing for 54 tissue samples from SCC patients and 22 samples from normal controls. Clinicopathologic findings were obtained from medical records. Correlation or t test statistics were used to analyze the relationships between methylation levels and clinical features. Survival data were estimated using the Kaplan-Meier method and compared to the log-rank test. RESULTS The methylation array identified 32 genes with distinct differences (p < 0.01) between stage Ib1 and IIa disease, and VIM was selected for further evaluation. Pyrosequencing analysis revealed that 40.7% of carcinoma samples had a higher methylation level in the VIM gene compared to the normal controls. VIM methylation status, low FIGO stage, and lack of parametrial involvement were significantly associated with longer disease-free survival (p = 0.036, p = 0.028, and p = 0.001, respectively). CONCLUSIONS We profiled 32 genes that might be associated with prognosis in cervical cancer. We further revealed that the VIM gene is frequently methylated in cervical SCC and that its methylation might predict a favorable prognosis.
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Affiliation(s)
- Min-Kyung Lee
- Department of Obstetrics and Gynecology, Chung-Ang University Hospital, Chung-Ang University School of Medicine, Seoul, Korea
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Park SH, Kim BR, Lee JH, Park ST, Lee SH, Dong SM, Rho SB. GABARBP down-regulates HIF-1α expression through the VEGFR-2 and PI3K/mTOR/4E-BP1 pathways. Cell Signal 2014; 26:1506-13. [PMID: 24686084 DOI: 10.1016/j.cellsig.2014.03.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 03/16/2014] [Indexed: 10/25/2022]
Abstract
Human γ-aminobutyrate type A (GABAA) receptor-binding protein (GABARBP), a tumor suppressor protein with apoptotic function, can be inhibited in response to angiogenesis through the PI3K/Akt signaling cascades. Here, we investigated whether GABARBP over-expression could regulate vascular endothelial growth factor (VEGF)/hypoxia-inducible factor-1α (HIF-1α) expression and angiogenic activity in a carcinoma model system. GABARBP dramatically inhibited VEGF-induced endothelial cell proliferation, migration, and tube formation, as well as VEGFR-2 phosphorylation in vitro. At the same time, GABARBP exposed potent anti-angiogenic activity and remarkably down-regulated the levels of VEGF and HIF-1α protein expression, key components for angiogenesis. In addressing its biological molecular mechanism, GABARBP was found to effectively inhibit the phosphorylation of down-stream PI3K components, such as PDK1, Akt, mTOR, TSC-2, p70S6K, and 4E-BP1 by directly binding with VEGFR-2. In contrast, p38/JNK phosphorylation was not suppressed by GABARBP. These findings disclose a novel function of GABARBP in suppressing VEGF and HIF-1α protein expression, which is important for tumor angiogenesis and tumor growth. Thus, our data strongly provides novel biological mechanistic insights into the regulatory function of GABARBP in ovarian tumor progression, and the important of pre-clinical certification of GABARBP as a potential angiogenesis agent targeting ovarian tumorigenesis.
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Affiliation(s)
- Sung Ho Park
- Department of Obstetrics and Gynecology, Hallym University, 948-1, Daerim 1-dong, Yeongdeungpo-gu, Seoul 150-950, Republic of Korea
| | - Boh-Ram Kim
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do 410-769, Republic of Korea
| | - Jeong Heon Lee
- Department of Obstetrics and Gynecology, Chonbuk National University Medical School, Jeonju 561-712, Republic of Korea
| | - Sung Taek Park
- Department of Obstetrics and Gynecology, Hallym University, 948-1, Daerim 1-dong, Yeongdeungpo-gu, Seoul 150-950, Republic of Korea
| | - Seung-Hoon Lee
- Department of Life Science, Yong In University, 470, Samga-dong, Cheoin-gu, Yongin-si Gyeonggi-do 449-714, Republic of Korea
| | - Seung Myung Dong
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do 410-769, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si Gyeonggi-do 410-769, Republic of Korea.
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Ko YB, Kim BR, Nam SL, Yang JB, Park SY, Rho SB. High-mobility group box 1 (HMGB1) protein regulates tumor-associated cell migration through the interaction with BTB domain. Cell Signal 2014; 26:777-83. [PMID: 24412753 DOI: 10.1016/j.cellsig.2013.12.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 12/29/2013] [Indexed: 02/03/2023]
Abstract
High-mobility group box 1 (HMGB1) was shown to be strongly implicated in high incidences of metastasis and the poor clinical pathologic conditions found in various human tumors. In this study, we explored the possible mechanism of HMGB1 in tumor metastases in vitro, using a human carcinoma cell system. BTB, as a negative regulator of cell cycle progression, was identified as a HMGB1 interacting partner. The ectopic expression of HMGB1 activates cell growth by suppressing BTB-induced cell death, decreasing Bax and p53 expression, while enhancing Bcl-xL, Bcl-2, cyclin D1, and NF-κB expression. HMGB1 activates the FAK/PI3K/mTOR signaling cascade, and BTB prominently inhibits HMGB1-induced oncogenesis. The effect of HMGB1 on FAK/mTOR signaling was also confirmed through the silencing of HMGB1 expression. These insights provide evidence that HMGB1 enhances cell proliferation and suppresses apoptosis. Collectively, our results show an underlying mechanism for an HMGB1-associated promotion of carcinoma cells.
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Affiliation(s)
- Young Bok Ko
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, 282, Munhwa-ro, Jung-gu, Daejeon 301-721, Republic of Korea
| | - Boh-Ram Kim
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Sang Lyun Nam
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, 282, Munhwa-ro, Jung-gu, Daejeon 301-721, Republic of Korea
| | - Jung Bo Yang
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, 282, Munhwa-ro, Jung-gu, Daejeon 301-721, Republic of Korea
| | - Sang-Yoon Park
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea.
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Kang S, Dong SM, Kim BR, Park MS, Trink B, Byun HJ, Rho SB. Thioridazine induces apoptosis by targeting the PI3K/Akt/mTOR pathway in cervical and endometrial cancer cells. Apoptosis 2013; 17:989-97. [PMID: 22460505 PMCID: PMC3413814 DOI: 10.1007/s10495-012-0717-2] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Recently, thioridazine (10-[2-(1-methyl-2-piperidyl) ethyl]-2-methylthiophenothiazine), a well-known anti-psychotic agent was found to have anti-cancer activity in cancer cells. However, the molecular mechanism of the agent in cellular signal pathways has not been well defined. Thioridazine significantly increased early- and late-stage apoptotic fraction in cervical and endometrial cancer cells, suggesting that suppression of cell growth by thioridazine was due to the induction of apoptosis. Cell cycle analysis indicated thioridazine induced the down-regulation of cyclin D1, cyclin A and CDK4, and the induction of p21 and p27, a cyclin-dependent kinase inhibitor. Additionally, we compared the influence of thioridazine with cisplatin used as a control, and similar patterns between the two drugs were observed in cervical and endometrial cancer cell lines. Furthermore, as expected, thioridazine successfully inhibited phosphorylation of Akt, phosphorylation of 4E-BP1 and phosphorylation of p70S6K, which is one of the best characterized targets of the mTOR complex cascade. These results suggest that thioridazine effectively suppresses tumor growth activity by targeting the PI3K/Akt/mTOR/p70S6K signaling pathway.
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Affiliation(s)
- Sokbom Kang
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769 Republic of Korea
- Division of Gynecologic Cancer Research, Research Institute and Hospital, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769 Republic of Korea
| | - Seung Myung Dong
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769 Republic of Korea
| | - Boh-Ram Kim
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769 Republic of Korea
| | - Mi Sun Park
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769 Republic of Korea
| | - Barry Trink
- Division of Head and Neck Cancer Research, Department of Otolaryngology and Head & Neck Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD 21231 USA
| | - Hyun-Jung Byun
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769 Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769 Republic of Korea
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Park ST, Kim BR, Park SH, Lee JH, Lee EJ, Lee SH, Rho SB. Suppression of VEGF expression through interruption of the HIF‑1α and Akt signaling cascade modulates the anti‑angiogenic activity of DAPK in ovarian carcinoma cells. Oncol Rep 2013; 31:1021-9. [PMID: 24337450 DOI: 10.3892/or.2013.2928] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 12/02/2013] [Indexed: 11/05/2022] Open
Abstract
Death-associated protein kinase (DAPK) plays an important role in apoptosis regulation and has been shown to maintain antitumor and metastasis suppressor properties. In the present study, we investigated whether DAPK overexpression may mediate vascular endothelial growth factor (VEGF)/hypoxia-inducible factor-1α (HIF-1α) expression and angiogenic activity in the human carcinoma cell model system. VEGF plays a pivotal role in tumor angiogenesis and tumorigenesis. We found that DAPK significantly downregulated VEGF-induced endothelial cell proliferation, migration and tube formation as well as VEGF receptor-2 (VEGFR-2) phosphorylation in vitro. In addition, DAPK exhibited potent anti-angiogenic activity and clearly decreased the levels of VEGF and HIF-1α expression, a key regulator for angiogenesis. Notably, our results strongly indicated that DAPK can disturb VEGFR-2 transcriptional activity by inhibiting VEGFR-2 phosphorylation through the PI3K/Akt signaling cascade. Collectively, our study identified a novel function of DAPK in regulating cellular VEGF/HIF-1α activity during tumorigenesis, which may act together with its anti-angiogenic function to inhibit tumor progression.
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Affiliation(s)
- Sung Taek Park
- Department of Obstetrics and Gynecology, Hallym University, Seoul 150‑950, Republic of Korea
| | - Boh-Ram Kim
- Research Institute, National Cancer Center, Goyang-si, Gyeonggi‑do 410‑769, Republic of Korea
| | - Sung Ho Park
- Department of Obstetrics and Gynecology, Hallym University, Seoul 150‑950, Republic of Korea
| | - Jeong Heon Lee
- Department of Obstetrics and Gynecology, Chonbuk National University Medical School, Jeonju 561‑712, Republic of Korea
| | - Eun-Ju Lee
- Department of Obstetrics and Gynecology, Chung‑Ang University School of Medicine/Chung‑Ang University Hospital, Seoul 156-755, Republic of Korea
| | - Seung-Hoon Lee
- Department of Life Science, Yong In University, Yongin-si, Gyeonggi-do 449-714, Republic of Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, Goyang-si, Gyeonggi‑do 410‑769, Republic of Korea
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Han J, Rho SB, Lee JY, Bae J, Park SH, Lee SJ, Lee SY, Ahn C, Kim JY, Chun T. Human cytomegalovirus (HCMV) US2 protein interacts with human CD1d (hCD1d) and down-regulates invariant NKT (iNKT) cell activity. Mol Cells 2013; 36:455-64. [PMID: 24213674 PMCID: PMC3887943 DOI: 10.1007/s10059-013-0221-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 09/06/2013] [Accepted: 09/09/2013] [Indexed: 02/06/2023] Open
Abstract
To avoid host immune surveillance, human cytomegalovirus (HCMV) encoded endoplasmic reticulum (ER)-membrane glycoprotein US2, which interferes with antigen presenting mechanism of Major histocompatibility complex (MHC) class Ia and class II molecules. However, not many attempts have been made to study the effect of HCMV US2 on the expression of MHC class Ib molecules. In this study, we examined the effect of HCMV US2 on the expression and function of human CD1d (hCD1d), which presents glycolipid antigens to invariant NKT (iNKT) cells. Our results clearly showed that the physiological interaction between ER lumenal domain of HCMV US2 and α3 domain of hCD1d was observed within ER. Compared with mature form of hCD1d, immature form of hCD1d is more susceptible to ubiquitin-dependent proteasomal degradation mediated by HCMV US2. Moreover, the ectopic expression of HCMV US2 leads to the down-modulation of iNKT cell activity without significant change of hCD1d expression. These results will advance our understanding of the function of HCMV US2 in immune evasive mechanisms against anti-viral immunity of iNKT cells.
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Affiliation(s)
- Jihye Han
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
| | | | - Jae Yeon Lee
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
| | - Joonbeom Bae
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
| | - Se Ho Park
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
| | | | | | | | | | - Taehoon Chun
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
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Yoo HJ, Kim BR, Byun HJ, Park SY, Rho SB. BLU enhances the effects of anti-angiogenic activity in combination with gemcitabine-based chemotherapeutic agents. Int J Biochem Cell Biol 2013; 45:1236-45. [DOI: 10.1016/j.biocel.2013.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 04/01/2013] [Accepted: 04/02/2013] [Indexed: 12/13/2022]
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Park ST, Byun HJ, Kim BR, Dong SM, Park SH, Jang PR, Rho SB. Tumor suppressor BLU promotes paclitaxel antitumor activity by inducing apoptosis through the down-regulation of Bcl-2 expression in tumorigenesis. Biochem Biophys Res Commun 2013; 435:153-9. [PMID: 23628417 DOI: 10.1016/j.bbrc.2013.04.061] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 04/18/2013] [Indexed: 01/30/2023]
Abstract
In this current work, we investigated whether BLU could enhance pro-apoptotic activity of chemotherapeutic drugs in ovarian carcinoma cells. A combination with a chemotherapeutic drug showed an additive effect, and this additive effect was supplemented by the enhancement of caspase-3 and -9 activities. BLU and paclitaxel induced cell cycle arrest in the G2/M phase through the reduction of cyclin dependent kinase 1, cyclin B1, while promoting both p16 and p27 expression. In addition, both BLU and paclitaxel enhanced the expression of the pro-apoptotic protein Bax together with the suppression of anti-apoptotic protein Bcl-2, a protein which is well-known for its function as a regulator in protecting cells from apoptosis. As expected, the Bax and p21 activities were enhanced by BLU or paclitaxel, while a combination of BLU and paclitaxel were additively promoted, whereas Bcl-xL and NF-κB including Bcl-2 activity were inactivated. This study has yielded promising results, which evidence for the first time that BLU could suppress the growth of carcinoma cells. Furthermore, both BLU and paclitaxel inhibited the phosphorylation of signaling components downstream of phosphoinositide 3-kinase, such as 3-phosphoinositide-dependent protein kinase 1, and Akt. Also, BLU plus paclitaxel decreased phosphorylation of p70 ribosomal S6 kinase, as well as decreasing the phosphorylation of glycogen synthase kinase-3β, which is one of the representative targets of the mammalian target of rapamycin signaling cascade. These results provide evidence that BLU enhances G2/M cell cycle arrest and apoptotic cell death through the up-regulation of Bax, p21 and p53 expression.
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Affiliation(s)
- Sung Taek Park
- Department of Obstetrics and Gynecology, Kangnam Sacred Heart Hospital, Hallym University, 948-1, Daerim 1-dong, Yeongdeungpo-gu, Seoul 150-950, Republic of Korea
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Rho SB, Byun HJ, Kim BR, Kim IS, Lee JH, Yoo R, Park ST, Park SH. GABAA receptor-binding protein promotes sensitivity to apoptosis induced by chemotherapeutic agents. Int J Oncol 2013; 42:1807-14. [PMID: 23545901 DOI: 10.3892/ijo.2013.1866] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Accepted: 03/08/2013] [Indexed: 11/06/2022] Open
Abstract
In the present study, the expression of human γ-aminobutyrate type A (GABAA) receptor-binding protein (GABARBP) is downregulated in ovarian cancer cell lines and tissues. We also found that the specific function of GABAPBP was that of a novel pro-apoptotic protein. Both GABARBP and cisplatin suppressed cancer cell proliferation in a concentration-dependent manner. The combined treatment of GABARBP and cisplatin was more effective in inhibiting cell growth, as well as cell migration, than with either drug treatment alone. At the same time, the treatment combination is correlated with the downregulation of cyclin D1 and CDK4, arrested cell cycle progression in the G₀-G₁ phase and enhancing p53 expression, while also reducing Bcl-2 and Bcl-xL expression. The p53 and p21 promoter luciferase activities were induced by GABARBP, whereas there was no effect on the p53-/- and p21-/- system. In addition, p53 activity was validated with UV irradiation and siGABARBP. Taken together, our results indicate that GABARBP can regulate the pro-apoptotic activity of cisplatin via the upregulation of p53 expression.
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Affiliation(s)
- Seung Bae Rho
- Research Institute, National Cancer Center, Goyang-si, Gyeonggi-do 410-769, Republic of Korea.
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Byun HJ, Kim BR, Yoo R, Park SY, Rho SB. sMEK1 enhances gemcitabine anti-cancer activity through inhibition of phosphorylation of Akt/mTOR. Apoptosis 2012; 17:1095-103. [DOI: 10.1007/s10495-012-0751-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Yoon CH, Rho SB, Kim ST, Kho S, Park J, Jang IS, Woo S, Kim SS, Lee JH, Lee SH. Crucial role of TSC-22 in preventing the proteasomal degradation of p53 in cervical cancer. PLoS One 2012; 7:e42006. [PMID: 22870275 PMCID: PMC3411576 DOI: 10.1371/journal.pone.0042006] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 07/02/2012] [Indexed: 11/25/2022] Open
Abstract
The p53 tumor suppressor function can be compromised in many tumors by the cellular antagonist HDM2 and human papillomavirus oncogene E6 that induce p53 degradation. Restoration of p53 activity has strong therapeutic potential. Here, we identified TSC-22 as a novel p53-interacting protein and show its novel function as a positive regulator of p53. We found that TSC-22 level was significantly down-regulated in cervical cancer tissues. Moreover, over-expression of TSC-22 was sufficient to inhibit cell proliferation, promote cellular apoptosis in cervical cancer cells and suppress growth of xenograft tumors in mice. Expression of also TSC-22 enhanced the protein level of p53 by protecting it from poly-ubiquitination. When bound to the motif between amino acids 100 and 200 of p53, TSC-22 inhibited the HDM2- and E6-mediated p53 poly-ubiquitination and degradation. Consequently, ectopic over-expression of TSC-22 activated the function of p53, followed by increased expression of p21Waf1/Cip1 and PUMA in human cervical cancer cell lines. Interestingly, TSC-22 did not affect the interaction between p53 and HDM2. Knock-down of TSC-22 by small interfering RNA clearly enhanced the poly-ubiquitination of p53, leading to the degradation of p53. These results suggest that TSC-22 acts as a tumor suppressor by safeguarding p53 from poly-ubiquitination mediated-degradation.
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Affiliation(s)
- Cheol-Hee Yoon
- Division of AIDS, Center for Immunology and Pathology, National Institute of Health, Cheongwon-gun, Chungbuk, Korea
| | - Seung Bae Rho
- Research Institute, National Cancer Center, Ilsandong-gu, Goyang-si Gyeonggi-do, Korea
| | - Seong-Tae Kim
- Department of Life Science, Yongin University, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea
| | - Seongho Kho
- Department of Life Science, Yongin University, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea
| | - Junsoo Park
- Division of Biological Sciences and Technology, Yonsei University, Wonju, Korea
| | - Ik-Soon Jang
- Korea Basic Science Institute, Daegeon Center, Daegion, Korea
| | - Seonock Woo
- South Sea Environment Research Department, Korea Ocean Research and Development Institute, Geoje, Korea
| | - Sung Soon Kim
- Division of AIDS, Center for Immunology and Pathology, National Institute of Health, Cheongwon-gun, Chungbuk, Korea
| | - Je-Ho Lee
- School of Medicine, Sungkyunkwan University, Samsung Medical Center, Seoul, Korea
- * E-mail: (J-HL); (S-HL)
| | - Seung-Hoon Lee
- Department of Life Science, Yongin University, Cheoin-gu, Yongin-si, Gyeonggi-do, Korea
- * E-mail: (J-HL); (S-HL)
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Kim BR, Shin HJ, Kim JY, Byun HJ, Lee JH, Sung YK, Rho SB. Dickkopf-1 (DKK-1) interrupts FAK/PI3K/mTOR pathway by interaction of carbonic anhydrase IX (CA9) in tumorigenesis. Cell Signal 2012; 24:1406-13. [PMID: 22430125 DOI: 10.1016/j.cellsig.2012.03.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Accepted: 03/04/2012] [Indexed: 01/01/2023]
Abstract
Recently, we found that carbonic anhydrase IX (CA9) modulates tumor-associated cell migration and invasion, and then identified dickkopf-1 (DKK-1) as a novel CA9-interacting protein. In this study, we have determined the binding regions that are required for interaction between CA9 and DKK-1 through in vitro and in vivo. The N-terminal domain of CA9 is participated to interact with the Val(60)-Tyr(168) site of DKK-1. We also observed that DKK-1 inhibits endothelial cell angiogenesis of CA9 in tumorigenesis. Furthermore, induction of CA9-mediated mTOR phosphorylation and angiogenesis was significantly inhibited by over-expression of DKK-1. Taken together, these findings identify DKK-1 as a potential factor in the regulation of CA9 cellular homeostasis and also suggest a new possible role for DKK1-1 in tumorigenesis.
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Affiliation(s)
- Boh-Ram Kim
- Research Institute and Hospital, National Cancer Center, Ilsandong-gu, Goyang-si, Gyeonggi-do, Republic of Korea
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Dong SM, Byun HJ, Kim BR, Lee SH, Trink B, Rho SB. Tumor suppressor BLU enhances pro-apoptotic activity of sMEK1 through physical interaction. Cell Signal 2012; 24:1208-14. [PMID: 22349239 DOI: 10.1016/j.cellsig.2012.02.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 02/06/2012] [Accepted: 02/06/2012] [Indexed: 10/28/2022]
Abstract
BLU is a tumor suppressor that acts as a transcriptional regulator through the association with cellular components. However, the working mechanism of BLU in cellular functions was not understood. We found that BLU directly interacts with sMEK1, a regulatory subunit of protein phosphatase 4. Furthermore, we determined the binding domains that are required for interaction between BLU and sMEK1. The N-terminal of BLU was observed to interact with the C-terminal of sMEK1. Binding activity was confirmed by the BLU-dependent increase of sMEK1 expression, as well as by the induced apoptotic activity. Also, expression of BLU and sMEK1 was down-regulated in ovarian and cervical patients, and was hypermethylated. These findings indicate that BLU can mediate the pro-apoptotic activity through the induction of sMEK1.
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Affiliation(s)
- Seung Myung Dong
- Research Institute, National Cancer Center, 323, Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-769, Republic of Korea
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Park SH, Lee JH, Lee GB, Byun HJ, Kim BR, Park CY, Kim HB, Rho SB. PDCD6 additively cooperates with anti-cancer drugs through activation of NF-κB pathways. Cell Signal 2011; 24:726-33. [PMID: 22142513 DOI: 10.1016/j.cellsig.2011.11.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Accepted: 11/02/2011] [Indexed: 12/14/2022]
Abstract
The expression of programmed cell death 6 (PDCD6) is known to be down-regulated in cancer cell lines and ovarian cancer tissues compared to normal cells and tissues. In the current study, we characterized the specific function of PDCD6 as a novel pro-apoptotic protein. To define the roles of PDCD6 and cisplatin in tumorigenesis, we either over-expressed PDCD6 or treated it with cisplatin in SKOV-3 ovarian cancer cells. Both PDCD6 and cisplatin respectively inhibited cancer cell proliferation in a dose-dependent manner. The combined treatment of PDCD6 and cisplatin was more effective at suppressing cell growth than with either drug treatment alone, but had no effect with the treatment of caspase-3 and caspase-9 inhibitors. Cleavages of caspase-3, -8, -9, and poly (ADP-ribose) polymerase (PARP) in PDCD6-overexpressing cells were significantly increased after cisplatin treatment. Cell cycle analysis highly correlated with down-regulation of cyclin D1 and CDK4, and the induction of p16 and p27 as a cyclin-dependent kinase inhibitor. Additionally, PDCD6 also suppressed the phosphorylation of signaling regulators downstream of PI3K, including PDK1 and Akt. PDCD6 promotes TNFα-dependent apoptosis through the activation of NF-κB signaling pathways, increasing Bax, p53, and p21 expression, while also down-regulating Bcl-2 and Bcl-xL expression. The p21 and p53 promoter luciferase activities were enhanced by PDCD6, while there was no affect in p53(-/-) and p21(-/-). At the same time, p53 activity was confirmed by UV irradiation and siPDCD6. Taken together, these results provide evidence that PDCD6 can mediate the pro-apoptotic activity of cisplatin or TNFα through the down-regulation of NF-κB expression.
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Affiliation(s)
- Sung Ho Park
- Department of Obstetrics and Gynecology, Hallym University, Seoul, Republic of Korea
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Lee KB, Byun HJ, Park SH, Park CY, Lee SH, Rho SB. CYR61 controls p53 and NF-κB expression through PI3K/Akt/mTOR pathways in carboplatin-induced ovarian cancer cells. Cancer Lett 2011; 315:86-95. [PMID: 22078465 DOI: 10.1016/j.canlet.2011.10.016] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 10/11/2011] [Accepted: 10/11/2011] [Indexed: 12/27/2022]
Abstract
CYR61 over-expression promotes cell proliferation by inhibiting carboplatin-induced apoptosis, decreasing Bax expression, and increasing Bcl-xL, Mcl-1, and Bcl-2. At the same time, down-regulating p53 expression, while up-regulated NF-κB expression. Additionally, p21 and p53 promoter activities were reduced, while NF-κB and Bcl-2 activities increased. In parallel, CYR61-expressing cells, during carboplatin-induced apoptosis, resulted in an increase of Akt phosphorylation, while rapamycin-treated cells were not affected. Carboplatin effectively inhibited the activation of mTOR signaling cascade, which includes mTOR, 4E-BP1, p70S6K, HIF-1α, and VEGF. These results provide evidence that CYR61 promotes cell proliferation and inhibits apoptosis.
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Affiliation(s)
- Kwang-Beom Lee
- Department of Obstetrics and Gynecology, Gachon University Gil Hospital, Guwol-Dong, Namdong-Gu, Inchen, Republic of Korea
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Rho SB, Song YJ, Lim MC, Lee SH, Kim BR, Park SY. Programmed cell death 6 (PDCD6) inhibits angiogenesis through PI3K/mTOR/p70S6K pathway by interacting of VEGFR-2. Cell Signal 2011; 24:131-9. [PMID: 21893193 DOI: 10.1016/j.cellsig.2011.08.013] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Revised: 08/02/2011] [Accepted: 08/20/2011] [Indexed: 11/15/2022]
Abstract
Programmed cell death 6 (PDCD6) was originally found as a pro-apoptotic protein, but its molecular mechanism is not well understood. In this study, we have attempted to investigate the effects of PDCD6 on the inhibition of angiogenesis-mediated cell growth as a novel anti-angiogenic protein. Purified recombinant human PDCD6 inhibited cell migration in a concentration-time-dependent manner. We also found that overexpressed PDCD6 suppressed vascular endothelial growth factor (VEGF)-induced proliferation, invasion, and capillary-like structure tube formation in vitro. PDCD6 suppressed phosphorylation of signaling regulators downstream from PI3K, including Akt, mammalian target of rapamycin (mTOR), glycogen synthase kinase-3β(GSK-3β), ribosomal protein S6 kinase (p70S6K), and also decreased cyclin D1 expression. We found binding PDCD6 to VEGFR-2, a key player in the PI3K/mTOR/P70S6K signaling pathway. Taken together, these data suggest that PDCD6 plays a significant role in modulating cellular angiogenesis.
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Affiliation(s)
- Seung Bae Rho
- Research Institute, National Cancer Center, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea.
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Shin HJ, Rho SB, Jung DC, Han IO, Oh ES, Kim JY. Carbonic anhydrase IX (CA9) modulates tumor-associated cell migration and invasion. J Cell Sci 2011; 124:1077-87. [PMID: 21363891 DOI: 10.1242/jcs.072207] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Expression of carbonic anhydrase IX (CA9) was shown to be strongly involved in high incidences of metastasis and poor prognosis in various human tumors. In this study, we investigated the possible role for CA9 in tumor metastases in vitro, using a gene transfection tool in the human cervical carcinoma cell line C33A. Gene expression profiling of CA9-transfected cells (C33A/CA9) and vector-transfected cells (C33A/Mock) was investigated by DNA microarray. The biological functions of differentially expressed genes between the C33A/CA9 and C33A/Mock cells included cell growth, regulation of cell-cell and cell-extracellular matrix adhesion and cytoskeletal organization. Immunofluorescent stain and Matrigel culture showed cytoskeletal remodeling, disassembled focal adhesion, weakened cell-cell adhesion and increased motility in C33A/CA9 cells. These invasive and metastatic phenotypes were associated with Rho-GTPase-related epithelial-mesenchymal transition. Inhibition of the Rho/Rho kinase pathway by a ROCK inhibitor (Y27632) and si-Rho (short interference RNA against RhoA) showed that Rho-GTPase signaling was involved in cellular morphologic and migratory changes. The effect of CA9 on Rho-GTPase signaling was also confirmed by silencing CA9 expression. Our results suggest that CA9 overexpression induces weakening of cell adhesions and augmented cell motility by aberrant Rho-GTPase signal transduction. Our study shows an underlying mechanism of CA9-related enhanced metastatic potential of tumor cells.
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Affiliation(s)
- Hye-Jin Shin
- Research Institute and Hospital, National Cancer Center, Goyang 410-769, Korea
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Hwang JR, Huh JH, Lee Y, Lee SI, Rho SB, Lee JH. Insulin-like growth factor-binding protein-5 (IGFBP-5) inhibits TNF-α-induced NF-κB activity by binding to TNFR1. Biochem Biophys Res Commun 2011; 405:545-51. [DOI: 10.1016/j.bbrc.2011.01.064] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Accepted: 01/19/2011] [Indexed: 01/16/2023]
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Rho SB, Lee JH, Park MS, Byun HJ, Kang S, Seo SS, Kim JY, Park SY. Anti-apoptotic protein TCTP controls the stability of the tumor suppressor p53. FEBS Lett 2010; 585:29-35. [PMID: 21081126 DOI: 10.1016/j.febslet.2010.11.014] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Accepted: 11/06/2010] [Indexed: 11/15/2022]
Abstract
In this study, we identified p53 as a novel TCTP-interacting protein using TCTP as bait. Also, we determined the critical binding sites between TCTP and p53. To elucidate the functional consequence of the interaction, we developed the overexpression and inhibition system of TCTP and p53 expression. Overexpression of TCTP in lung carcinoma cells reversed p53 mediated apoptosis and inhibition of TCTP expression by small interfering RNA increased apoptosis of lung carcinoma cells. Moreover, it was observed that TCTP overexpression promotes degradation of p53. These results clearly indicate that the interaction between TCTP and p53 prevents apoptosis by destabilizing p53. Thus, TCTP acts as a negative regulator of apoptosis in lung cancer.
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Affiliation(s)
- Seung Bae Rho
- Research Institute, National Cancer Center, Ilsandong-gu, Goyang-si Gyeonggi-do, Republic of Korea.
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