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Zhang Z, Xu J, Liu J, Wang J, Lei L. SEC: A core hub during cell fate alteration. FASEB J 2024; 38:e23680. [PMID: 38758186 DOI: 10.1096/fj.202400514r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 04/18/2024] [Accepted: 05/07/2024] [Indexed: 05/18/2024]
Abstract
Pol II pause release is a rate-limiting step in gene transcription, influencing various cell fate alterations. Numerous proteins orchestrate Pol II pause release, thereby playing pivotal roles in the intricate process of cellular fate modulation. Super elongation complex (SEC), a large assembly comprising diverse protein components, has garnered attention due to its emerging significance in orchestrating physiological and pathological cellular identity changes by regulating the transcription of crucial genes. Consequently, SEC emerges as a noteworthy functional complex capable of modulating cell fate alterations. Therefore, a comprehensive review is warranted to systematically summarize the core roles of SEC in different types of cell fate alterations. This review focuses on elucidating the current understanding of the structural and functional basis of SEC. Additionally, we discuss the intricate regulatory mechanisms governing SEC in various models of cell fate alteration, encompassing both physiological and pathological contexts. Furthermore, leveraging the existing knowledge of SEC, we propose some insightful directions for future research, aiming to enhance our mechanistic and functional comprehension of SEC within the diverse landscape of cell fate alterations.
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Affiliation(s)
- Zhijing Zhang
- College of Life Science, Northeast Agricultural University, Harbin, Heilongjiang Province, China
- Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jingyi Xu
- Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jiqiang Liu
- Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jiaqiang Wang
- College of Life Science, Northeast Agricultural University, Harbin, Heilongjiang Province, China
| | - Lei Lei
- Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China
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2
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Guan J, Xu X, Qiu G, He C, Lu X, Wang K, Liu X, Li Y, Ling Z, Tang X, Liang Y, Tao X, Cheng B, Yang B. Cellular hierarchy framework based on single-cell/multi-patient sample sequencing reveals metabolic biomarker PYGL as a therapeutic target for HNSCC. J Exp Clin Cancer Res 2023; 42:162. [PMID: 37420300 DOI: 10.1186/s13046-023-02734-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 06/04/2023] [Indexed: 07/09/2023] Open
Abstract
BACKGROUND A growing body of research has revealed the connection of metabolism reprogramming and tumor progression, yet how metabolism reprogramming affects inter-patient heterogeneity and prognosis in head and neck squamous cell carcinoma (HNSCC) still requires further explorations. METHODS A cellular hierarchy framework based on metabolic properties discrepancy, METArisk, was introduced to re-analyze the cellular composition from bulk transcriptomes of 486 patients through deconvolution utilizing single-cell reference profiles from 25 primary and 8 metastatic HNSCC sample integration of previous studies. Machine learning methods were used to identify the correlations between metabolism-related biomarkers and prognosis. The functions of the genes screened out in tumor progression, metastasis and chemotherapy resistance were validated in vitro by cellular functional experiments and in vivo by xenograft tumor mouse model. RESULTS Incorporating the cellular hierarchy composition and clinical properties, the METArisk phenotype divided multi-patient cohort into two classes, wherein poor prognosis of METArisk-high subgroup was associated with a particular cluster of malignant cells with significant activity of metabolism reprogramming enriched in metastatic single-cell samples. Subsequent analysis targeted for phenotype differences between the METArisk subgroups identified PYGL as a key metabolism-related biomarker that enhances malignancy and chemotherapy resistance by GSH/ROS/p53 pathway, leading to poor prognosis of HNSCC. CONCLUSION PYGL was identified as a metabolism-related oncogenic biomarker that promotes HNSCC progression, metastasis and chemotherapy resistance though GSH/ROS/p53 pathway. Our study revealed the cellular hierarchy composition of HNSCC from the cell metabolism reprogramming perspective and may provide new inspirations and therapeutic targets for HNSCC in the future.
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Affiliation(s)
- Jiezhong Guan
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - Xi Xu
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Guo Qiu
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Chong He
- Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Xiaoyue Lu
- Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Kang Wang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - Xinyu Liu
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - Yuanyuan Li
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - Zihang Ling
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - Xuan Tang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - Yujie Liang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - Xiaoan Tao
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China.
| | - Bin Cheng
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China.
| | - Bo Yang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China.
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Li SS, Jiang WL, Xiao WQ, Li K, Zhang YF, Guo XY, Dai YQ, Zhao QY, Jiang MJ, Lu ZJ, Wan R. KMT2D deficiency enhances the anti-cancer activity of L48H37 in pancreatic ductal adenocarcinoma. World J Gastrointest Oncol 2019; 11:599-621. [PMID: 31435462 PMCID: PMC6700028 DOI: 10.4251/wjgo.v11.i8.599] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 01/23/2019] [Accepted: 02/27/2019] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Novel therapeutic strategies are urgently needed for patients with a delayed diagnosis of pancreatic ductal adenocarcinoma (PDAC) in order to improve their chances of survival. Recent studies have shown potent anti-neoplastic effects of curcumin and its analogues. In addition, the role of histone methyltransferases on cancer therapeutics has also been elucidated. However, the relationship between these two factors in the treatment of pancreatic cancer remains unknown. Our working hypothesis was that L48H37, a novel curcumin analog, has better efficacy in pancreatic cancer cell growth inhibition in the absence of histone-lysine N-methyltransferase 2D (KMT2D).
AIM To determine the anti-cancer effects of L48H37 in PDAC, and the role of KMT2D on its therapeutic efficacy.
METHODS The viability and proliferation of primary (PANC-1 and MIA PaCa-2) and metastatic (SW1990 and ASPC-1) PDAC cell lines treated with L48H37 was determined by CCK8 and colony formation assay. Apoptosis, mitochondrial membrane potential (MMP), reactive oxygen species (ROS) levels, and cell cycle profile were determined by staining the cells with Annexin-V/7-AAD, JC-1, DCFH-DA, and PI respectively, as well as flow cytometric acquisition. In vitro migration was assessed by the wound healing assay. The protein and mRNA levels of relevant factors were analyzed using Western blotting, immunofluorescence and real time-quantitative PCR. The in situ expression of KMT2D in both human PDAC and paired adjacent normal tissues was determined by immunohistochemistry. In vivo tumor xenografts were established by injecting nude mice with PDAC cells. Bioinformatics analyses were also conducted using gene expression databases and TCGA.
RESULTS L48H37 inhibited the proliferation and induced apoptosis in SW1990 and ASPC-1 cells in a dose- and time-dependent manner, while also reducing MMP, increasing ROS levels, arresting cell cycle at the G2/M stages and activating the endoplasmic reticulum (ER) stress-associated protein kinase RNA-like endoplasmic reticulum kinase/eukaryotic initiation factor 2α/activating transcription factor 4 (ATF4)/CHOP signaling pathway. Knocking down ATF4 significantly upregulated KMT2D in PDAC cells, and also decreased L48H37-induced apoptosis. Furthermore, silencing KMT2D in L48H37-treated cells significantly augmented apoptosis and the ER stress pathway, indicating that KMT2D depletion is essential for the anti-neoplastic effects of L48H37. Administering L48H37 to mice bearing tumors derived from control or KMT2D-knockdown PDAC cells significantly decreased the tumor burden. We also identified several differentially expressed genes in PDAC cell lines expressing very low levels of KMT2D that were functionally categorized into the extrinsic apoptotic signaling pathway. The KMT2D high- and low-expressing PDAC patients from the TCGA database showed similar survival rates,but higher KMT2D expression was associated with poor tumor grade in clinical and pathological analyses.
CONCLUSION L48H37 exerts a potent anti-cancer effect in PDAC, which is augmented by KMT2D deficiency.
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Affiliation(s)
- Si-Si Li
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Wei-Liang Jiang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Wen-Qin Xiao
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Kai Li
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Ye-Fei Zhang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Xing-Ya Guo
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Yi-Qi Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Qiu-Yan Zhao
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Ming-Jie Jiang
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Zhan-Jun Lu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Rong Wan
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
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Lee JY, Lee SH, Kim KS, Park KH, Park KS. Ell3 functions as a critical decision maker at the crossroad between stem cell senescence and apoptosis. Stem Cell Res Ther 2019; 10:32. [PMID: 30654843 PMCID: PMC6335702 DOI: 10.1186/s13287-019-1137-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 12/16/2018] [Accepted: 01/07/2019] [Indexed: 11/23/2022] Open
Abstract
Background Ell3 is a RNA polymerase II elongation factor that has various cell type-dependent functions, such as regulating the differentiation efficiency of embryonic stem cells and sensitizing cancer cells to anticancer drugs. However, there has been little research on the role of Ell3 on the regulation of senescence and apoptosis of stem cells. Methods We analyzed the senescence of Ell3-suppressed stem cells by mitochondrial activity, β-gal (+) cells, and lineage differentiation efficiency. The apoptosis of Ell3-overexpressing stem cells was analyzed by Annexin V staining, Immunoblot, and Live&dead assay. In addition, chromatin immunoprecipitation and luciferase assays were used to demonstrate p53 functions as a direct transcriptional activator of Ell3. Results Suppression of Ell3 expression induced senescence in stem cells by increasing Bcl-2 expression. Unlike the effect of Ell3 suppression, the ectopic expression of Ell3 induces apoptosis of stem cells and induces apoptosis of adjacent cells. In addition, p53 functions as a direct transcriptional activator of Ell3 during the stem cell apoptosis. Conclusions We suggest that the function of Ell3 is associated with the p53-Bcl2 axis in both senescent and apoptotic ADSCs. Electronic supplementary material The online version of this article (10.1186/s13287-019-1137-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jae-Yong Lee
- Department of Biomedical Science, College of Life Science and CHA Stem Cell Institute, CHA University, 335, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-400, Korea
| | - Soo-Hong Lee
- Department of Biomedical Science, College of Life Science and CHA Stem Cell Institute, CHA University, 335, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-400, Korea
| | - Kwang-Soo Kim
- Department of Biomedical Science, College of Life Science and CHA Stem Cell Institute, CHA University, 335, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-400, Korea
| | - Keun-Hong Park
- Department of Biomedical Science, College of Life Science and CHA Stem Cell Institute, CHA University, 335, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-400, Korea
| | - Kyung-Soon Park
- Department of Biomedical Science, College of Life Science and CHA Stem Cell Institute, CHA University, 335, Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-400, Korea.
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5
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Lee JY, Park YJ, Oh N, Kwack KB, Park KS. A transcriptional complex composed of ER(α), GATA3, FOXA1 and ELL3 regulates IL-20 expression in breast cancer cells. Oncotarget 2018; 8:42752-42760. [PMID: 28514748 PMCID: PMC5522103 DOI: 10.18632/oncotarget.17459] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 04/15/2017] [Indexed: 11/25/2022] Open
Abstract
Interleukin-20 (IL-20) is a member of the IL-10 family. IL-20 expression is regulated by a transcription elongation factor, Ell3, in estrogen receptor-positive (ER(+)) breast cancer cells. In this study, we demonstrated that ER(α), GATA3 and FOXA1 form a transcriptional complex with Ell3 to regulate IL-20 expression in ER(+) breast cancer cells. We also determined that GATA3 and FOXA1 share a binding site with ER(α) in the interleukin-20 promoter. Furthermore, we found that FOXA1 represses IL-20 expression, whereas GATA3 and ER(α) activate it. In addition, we demonstrated that Ell3 associates with ER(α) to increase its binding affinity to the IL-20 promoter, which may prevent FOXA1 binding to the same region of this promoter. Our results expand upon the current understanding of the regulatory mechanism of IL-20 in cancer.
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Affiliation(s)
- Jae Yong Lee
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
| | - Young Joon Park
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
| | - Nuri Oh
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
| | - Kyu Bum Kwack
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
| | - Kyung-Soon Park
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
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6
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Lee JY, Oh N, Park KS. Ell3 Modulates the Wound Healing Activity of Conditioned Medium of Adipose-derived Stem Cells. Dev Reprod 2017; 21:335-342. [PMID: 29082349 PMCID: PMC5651700 DOI: 10.12717/dr.2017.21.3.335] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 09/25/2017] [Accepted: 09/26/2017] [Indexed: 01/09/2023]
Abstract
While adipose-derived stem cell-conditioned medium (ADSC-CM) has been
demonstrated to promote skin wound healing, the mechanism regulating this effect
remains unelucidated. In this study, we aimed to investigate the role of Ell3 in
the wound healing activity of ADSC-CM. In vitro analysis
revealed that Ell3 suppression in ADSCs impairs the promotive activity of
ADSC-CM on the proliferation and migration of mouse embryonic fibroblasts (MEF)
and normal human dermal fibroblasts (NHDF). Consistently, the expression of MMP
family genes, which regulate cell proliferation and migration, was significantly
suppressed in MEF and NHDF treated with siEll3-transfected ADSC-CM.
Proinflammatory cytokines, such as interleukin-1 and interleukin-6, were highly
expressed in MEF treated with siEll3-transfected ADSC-CM. The wound healing
activity of siEll3-transfected ADSC-CM was significantly lower than that of the
control in vivo. Our results suggest that Ell3 may contribute
to the inhibition of inflammatory response during skin wound healing.
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Affiliation(s)
- Jae-Yong Lee
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
| | - Nuri Oh
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
| | - Kyung-Soon Park
- Department of Biomedical Science, College of Life Science, CHA University, Seoul, Korea
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7
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Alexander LEMM, Watters J, Reusch JA, Maurin M, Nepon-Sixt BS, Vrzalikova K, Alexandrow MG, Murray PG, Wright KL. Selective expression of the transcription elongation factor ELL3 in B cells prior to ELL2 drives proliferation and survival. Mol Immunol 2017; 91:8-16. [PMID: 28858629 DOI: 10.1016/j.molimm.2017.08.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 08/07/2017] [Accepted: 08/16/2017] [Indexed: 12/12/2022]
Abstract
B cell activation is dependent on a large increase in transcriptional output followed by focused expression on secreted immunoglobulin as the cell transitions to an antibody producing plasma cell. The rapid transcriptional induction is facilitated by the release of poised RNA pol II into productive elongation through assembly of the super elongation complex (SEC). We report that a SEC component, the Eleven -nineteen Lysine-rich leukemia (ELL) family member 3 (ELL3) is dynamically up-regulated in mature and activated human B cells followed by suppression as B cells transition to plasma cells in part mediated by the transcription repressor PRDM1. Burkitt's lymphoma and a sub-set of Diffuse Large B cell lymphoma cell lines abundantly express ELL3. Depletion of ELL3 in the germinal center derived lymphomas results in severe disruption of DNA replication and cell division along with increased DNA damage and cell death. This restricted utilization and survival dependence reveal a key step in B cell activation and indicate a potential therapeutic target against B cell lymphoma's with a germinal center origin.
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Affiliation(s)
- Lou-Ella M M Alexander
- Cancer Biology Ph.D. Program, University of South Florida, Tampa, FL 33612, United States; Department of Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, United States
| | - January Watters
- Cancer Biology Ph.D. Program, University of South Florida, Tampa, FL 33612, United States; Department of Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, United States
| | - Jessica A Reusch
- Department of Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, United States
| | - Michelle Maurin
- Department of Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, United States
| | - Brook S Nepon-Sixt
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, United States
| | - Katerina Vrzalikova
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Mark G Alexandrow
- Department of Molecular Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, United States
| | - Paul G Murray
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Kenneth L Wright
- Department of Immunology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, United States.
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Transcription factor Yin Yang 2 is a novel regulator of the p53/p21 axis. Oncotarget 2017; 8:54694-54707. [PMID: 28903375 PMCID: PMC5589614 DOI: 10.18632/oncotarget.18005] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 05/08/2017] [Indexed: 12/12/2022] Open
Abstract
Yin Yang 2 (YY2) is a multifunctional zinc-finger transcription factor that belongs to YY family. Unlike the well-characterized YY1, our understanding regarding the biological functions of YY2 is still very limited. Here we found for the first time that in contrast to YY1, which had been reported to be oncogenic, the expression level of YY2 in tumor cells and/or tissues was downregulated compared with its expression level in the normal ones. We also demonstrated that YY2 exerts biological function contrary to YY1 in cell proliferation. We elucidated that YY2 positively enhances p21 expression, and concomitantly, its silencing promotes cells to enter G2/M phase and enhances cell proliferation. Furthermore, we found that YY2 regulation on p21 occurs p53-dependently. Finally, we identified a novel YY2 binding site in the promoter region of tumor suppressor p53. We found that YY2 binds to the p53 promoter and activates its transcriptional activity, and subsequently, regulates cell cycle progression via p53/p21 axis. Taken together, our study not only identifies YY2 as a novel tumor suppressor gene that plays a pivotal role in cell cycle regulation, but also provides new insights regarding the regulatory mechanism of the conventional p53/p21 axis.
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9
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LF-MF inhibits iron metabolism and suppresses lung cancer through activation of P53-miR-34a-E2F1/E2F3 pathway. Sci Rep 2017; 7:749. [PMID: 28389657 PMCID: PMC5429732 DOI: 10.1038/s41598-017-00913-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 03/16/2017] [Indexed: 12/15/2022] Open
Abstract
Our previous studies showed that low frequency magnetic fields (LF-MF) suppressed tumor growth and influenced the function of immune system. Nevertheless the mechanisms behind the effect of LF-MF still remain to be elucidated. In this study, Tumor- bearing mice subcutaneously inoculated with Lewis lung cancer cells were exposed to a LF-MF (0.4T, 7.5 Hz) for 35 days and Survival rate, tumor growth and the tumor markers were measured. Results showed that tumor growth was obviously inhibited with a prolonged survival of tumor- bearing mice by LF-MF exposure. In vitro experiments, LF-MF was found to induce cell growth arrest, cell senescence and inhibit iron metabolism of lung cancer cells. Moreover, LF-MF stabilized p53 protein via inhibiting cell iron metabolism and the stabilized p53 protein enhanced miR-34a transcription. Furthermore, increased expression of miR-34a induced cell proliferation inhibition, cell cycle arrest and cell senescence of lung cancer cells by targeting E2F1/E2F3. We also detected the relevant indicator in tumor tissue such as the iron content, the level of miR-34a and related protein, corresponding results were obtained. Taken together, these observations imply that LF-MF suppressed lung cancer via inhibiting cell iron metabolism, stabilizing p53 protein and activation P53- miR-34a-E2F1/E2F3 pathway.
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10
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Liu R, Ji P, Liu B, Qiao H, Wang X, Zhou L, Deng T, Ba Y. Apigenin enhances the cisplatin cytotoxic effect through p53-modulated apoptosis. Oncol Lett 2016; 13:1024-1030. [PMID: 28356995 DOI: 10.3892/ol.2016.5495] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 11/07/2016] [Indexed: 12/12/2022] Open
Abstract
Epidemiological and experimental evidence suggests that dietary flavonoids, including apigenin, have anticancer roles. Apigenin has been reported to elevate p53, a critical molecule in the induction of apoptosis. The present study aimed to investigate whether apigenin, a dietary flavonoid, improves the cytotoxic effect of cisplatin in a cancer cell culture system, and to elucidate the mechanism of this effect. Multiple tumor cell types were treated with apigenin, cisplatin or both drugs. Cell viability was evaluated, and the cytotoxic effect was determined biochemically and microscopically. Treatment with apigenin increased cisplatin-induced DNA damage and the apoptosis of tumor cells in a p53-dependent manner. Apigenin, when used with cisplatin, inhibited cell proliferation and promoted mitogen-activated protein kinase activation and subsequent p53 phosphorylation, leading to p53 accumulation and upregulation of proapoptotic proteins. Cisplatin is one of the most commonly used chemotherapeutic drugs for malignant tumors, but resistance to this drug occurs. The current results therefore demonstrate that dietary flavonoids may diminish the resistance of cancers to cisplatin.
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Affiliation(s)
- Rui Liu
- Department of Gastrointestinal Oncology, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
| | - Ping Ji
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University Medical School, Nanjing, Jiangsu 210093, P.R. China
| | - Bin Liu
- Department of Gastrointestinal Oncology, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
| | - Haishi Qiao
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University Medical School, Nanjing, Jiangsu 210093, P.R. China
| | - Xia Wang
- Department of Gastrointestinal Oncology, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
| | - Likun Zhou
- Department of Gastrointestinal Oncology, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
| | - Ting Deng
- Department of Gastrointestinal Oncology, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
| | - Yi Ba
- Department of Gastrointestinal Oncology, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
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11
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Sharma N. Regulation of RNA polymerase II-mediated transcriptional elongation: Implications in human disease. IUBMB Life 2016; 68:709-16. [DOI: 10.1002/iub.1538] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 07/14/2016] [Indexed: 01/03/2023]
Affiliation(s)
- Nimisha Sharma
- University School of Biotechnology, G.G.S. Indraprastha University; Dwarka New Delhi 110078 India
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