1
|
Akita N, Okada R, Mukae K, Sugino RP, Takenobu H, Chikaraishi K, Ochiai H, Yamaguchi Y, Ohira M, Koseki H, Kamijo T. Polycomb group protein BMI1 protects neuroblastoma cells against DNA damage-induced apoptotic cell death. Exp Cell Res 2023; 422:113412. [PMID: 36370852 DOI: 10.1016/j.yexcr.2022.113412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 10/31/2022] [Accepted: 11/05/2022] [Indexed: 11/10/2022]
Abstract
The overexpression of BMI1, a polycomb protein, correlates with cancer development and aggressiveness. We previously reported that MYCN-induced BMI1 positively regulated neuroblastoma (NB) cell proliferation via the transcriptional inhibition of tumor suppressors in NB cells. To assess the potential of BMI1 as a new target for NB therapy, we examined the effects of reductions in BMI1 on NB cells. BMI1 knockdown (KD) in NB cells significantly induced their differentiation for up to 7 days. BMI1 depletion significantly induced apoptotic NB cell death for up to 14 days along with the activation of p53, increases in p73, and induction of p53 family downstream molecules and pathways, even in p53 mutant cells. BMI1 depletion in vivo markedly suppressed NB xenograft tumor growth. BMI1 reductions activated ATM and increased γ-H2AX in NB cells. These DNA damage signals and apoptotic cell death were not canceled by the transduction of the polycomb group molecules EZH2 and RING1B. Furthermore, EZH2 and RING1B KD did not induce apoptotic NB cell death to the same extent as BMI1 KD. Collectively, these results suggest the potential of BMI1 as a target of molecular therapy for NB and confirmed, for the first time, the shared role of PcG proteins in the DNA damage response of NB cells.
Collapse
Affiliation(s)
- Nobuhiro Akita
- Department of Hematology and Oncology, Children's Medical Center, Japanese Red Cross Aichi Medical Center Nagoya First Hospital, Japan; Division of Biochemistry and Molecular Carcinogenesis, Chiba Cancer Center Research Institute, Japan; Department of Pediatrics, Chiba University School of Medicine, Japan; Research Institute for Clinical Oncology, Saitama Cancer Center, Japan
| | - Ryu Okada
- Research Institute for Clinical Oncology, Saitama Cancer Center, Japan; Department of Graduate School of Science and Engineering, Saitama University, Japan
| | - Kyosuke Mukae
- Research Institute for Clinical Oncology, Saitama Cancer Center, Japan
| | - Ryuichi P Sugino
- Research Institute for Clinical Oncology, Saitama Cancer Center, Japan
| | - Hisanori Takenobu
- Division of Biochemistry and Molecular Carcinogenesis, Chiba Cancer Center Research Institute, Japan; Research Institute for Clinical Oncology, Saitama Cancer Center, Japan.
| | - Koji Chikaraishi
- Department of Pediatrics, Chiba University School of Medicine, Japan; Research Institute for Clinical Oncology, Saitama Cancer Center, Japan
| | - Hidemasa Ochiai
- Department of Pediatrics, Chiba University School of Medicine, Japan
| | - Yohko Yamaguchi
- Division of Biochemistry and Molecular Carcinogenesis, Chiba Cancer Center Research Institute, Japan; Department of Molecular Toxicology, Faculty of Pharmaceutical Sciences, Toho University, Japan
| | - Miki Ohira
- Division of Biochemistry and Molecular Carcinogenesis, Chiba Cancer Center Research Institute, Japan; Research Institute for Clinical Oncology, Saitama Cancer Center, Japan
| | - Haruhiko Koseki
- Developmental Genetics Group, RIKEN Research Center for Allergy and Immunology, Japan
| | - Takehiko Kamijo
- Division of Biochemistry and Molecular Carcinogenesis, Chiba Cancer Center Research Institute, Japan; Research Institute for Clinical Oncology, Saitama Cancer Center, Japan; Department of Graduate School of Science and Engineering, Saitama University, Japan.
| |
Collapse
|
2
|
Wang H, Wang X, Xu L, Zhang J. TP53 and TP53-associated genes are correlated with the prognosis of paediatric neuroblastoma. BMC Genom Data 2022; 23:41. [PMID: 35655142 PMCID: PMC9164562 DOI: 10.1186/s12863-022-01059-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 05/27/2022] [Indexed: 11/18/2022] Open
Abstract
Background TP53 is rarely mutated in paediatric neuroblastoma. The prognosis of TP53 and TP53-associated genes in paediatric neuroblastoma is unclear. The objectives of the study were to analyse datasets of 2477 paediatric neuroblastoma patients from eight independent cohorts to reveal the prognosis of TP53 and TP53-associated genes. Results High TP53 mRNA expression was associated with shortened event-free survival and overall survival in paediatric neuroblastoma. Moreover, a higher enrichment score of the TP53 signalling pathway was associated with worse clinical outcomes of paediatric neuroblastoma. Among the genes associated with TP53, CCNE1, CDK2 and CHEK2 were correlated with unfavourable clinical outcomes, while SESN1 was correlated with favourable clinical outcomes of paediatric neuroblastoma in the eight independent neuroblastoma cohorts. TP53, CCNE1, CDK2 and CHEK2 were overexpressed in neuroblastoma patients with MYCN amplification, while SESN1 was downregulated in neuroblastoma patients with MYCN amplification. CCNE1, SESN1, MYCN amplification and age at diagnosis were independent prognostic markers of neuroblastoma. CCNE1 was also highly expressed in paediatric neuroblastoma patients with an age at diagnosis ≥ 18 months, while SESN1 was downregulated in paediatric neuroblastoma patients with an age at diagnosis ≥ 18 months. Combinations of CCNE1 with age at diagnosis or combinations of SESN1 with age at diagnosis achieved superior prognostic effects in paediatric neuroblastoma. Finally, we constructed a nomogram risk model of paediatric neuroblastoma based on age and TP53, CCNE1, CDK2, CHEK2 and SESN1 expression. The nomogram model could predict the overall survival of paediatric neuroblastoma and MYCN nonamplified paediatric neuroblastoma with high specificity and sensitivity. Conclusions TP53 and TP53-associated genes CCNE1, CDK2, CHEK2 and SESN1 were significantly associated with the clinical outcomes of paediatric neuroblastoma. Supplementary Information The online version contains supplementary material available at 10.1186/s12863-022-01059-5.
Collapse
Affiliation(s)
- Haiwei Wang
- Medical Research Center, Fujian Maternity and Child Health Hospital, Fuzhou, Fujian, China.
| | - Xinrui Wang
- Medical Research Center, Fujian Maternity and Child Health Hospital, Fuzhou, Fujian, China
| | - Liangpu Xu
- Medical Research Center, Fujian Maternity and Child Health Hospital, Fuzhou, Fujian, China
| | - Ji Zhang
- State Key Laboratory for Medical Genomics, Shanghai Institute of Hematology, Rui-Jin Hospital Affiliated to School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
| |
Collapse
|
3
|
Li Y, Li L. Bioinformatic screening for candidate biomarkers and their prognostic values in endometrial cancer. BMC Genet 2020; 21:113. [PMID: 32962636 PMCID: PMC7510080 DOI: 10.1186/s12863-020-00898-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Accepted: 08/11/2020] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Endometrial cancer is a common gynecological cancer with annually increasing incidence worldwide. However, the biomarkers that provide prognosis and progression for this disease remain elusive. RESULTS Two eligible human endometrial cancer datasets (GSE17025 and GSE25405) were selected for the study. A total of 520 differentially expressed mRNAs and 30 differentially expressed miRNAs were identified. These mRNAs were mainly enriched in cell cycle, skeletal system development, vasculature development, oocyte maturation, and oocyte meiosis signalling pathways. A total of 160 pairs of differentially expressed miRNAs and mRNAs, including 22 differentially expressed miRNAs and 71 overlapping differentially expressed mRNAs, were validated in endometrial cancer samples using starBase v2.0 project. The prognosis analysis revealed that Cyclin E1 (CCNE1, one of the 82 hub genes, which correlated with hsa-miR-195 and hsa-miR-424) was significantly linked to a worse overall survival in endometrial cancer patients. CONCLUSIONS The hub genes and differentially expressed miRNAs identified in this study might be used as prognostic biomarkers for endometrial cancer and molecular targets for its treatment.
Collapse
Affiliation(s)
- Yaowei Li
- Department of Gynecologic Oncology, Affiliated Tumor Hospital of Guangxi Medical University, Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Ministry of Education, Nanning, Guangxi, 530021, People's Republic of China.,Department of Gynecology and obstetrics, Shangyu People's Hospital, Shangyu, Zhejiang, 312300, People's Republic of China
| | - Li Li
- Department of Gynecologic Oncology, Affiliated Tumor Hospital of Guangxi Medical University, Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor, Ministry of Education, Nanning, Guangxi, 530021, People's Republic of China.
| |
Collapse
|
4
|
Ding Y, Yang J, Ma Y, Yao T, Chen X, Ge S, Wang L, Fan X. MYCN and PRC1 cooperatively repress docosahexaenoic acid synthesis in neuroblastoma via ELOVL2. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2019; 38:498. [PMID: 31856871 PMCID: PMC6923955 DOI: 10.1186/s13046-019-1492-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Accepted: 11/25/2019] [Indexed: 01/09/2023]
Abstract
Background The MYCN amplification is a defining hallmark of high-risk neuroblastoma. Due to irregular oncogenes orchestration, tumor cells exhibit distinct fatty acid metabolic features from non-tumor cells. However, the function of MYCN in neuroblastoma fatty acid metabolism reprogramming remains unknown. Methods Gas Chromatography-Mass Spectrometer (GC-MS) was used to find the potential target fatty acid metabolites of MYCN. Real-time PCR (RT-PCR) and clinical bioinformatics analysis was used to find the related target genes. The function of the identified target gene ELOVL2 on cell growth was detected through CCK-8 assay, Soft agar colony formation assay, flow Cytometry assay and mouse xenograft. Chromatin immunoprecipitation (ChIP) and Immunoprecipitation-Mass Spectrometer (IP-MS) further identified the target gene and the co-repressor of MYCN. Results The fatty acid profile of MYCN-depleted neuroblastoma cells identified docosahexaenoic acid (DHA), an omega-3 polyunsaturated fatty acid with anti-tumor activity, significantly increased after MYCN depletion. Compared with MYCN single-copy neuroblastoma cells, DHA level was significantly lower in MYCN-amplified neuroblastoma cells. RT-PCR and clinical bioinformatics analysis discovered that MYCN interfered DHA accumulation via ELOVL fatty acid elongase 2 (ELOVL2) which is a rate-limiting enzyme of cellular DHA synthesis. Enforced ELOVL2 expression in MYCN-amplified neuroblastoma cells led to decreased cell growth and counteracted the growth-promoting effect of MYCN overexpression both in vitro and vivo. ELOVL2 Knockdown showed the opposite effect in MYCN single-copy neuroblastoma cells. In primary neuroblastoma, high ELOVL2 transcription correlated with favorable clinical tumor biology and patient survival. The mechanism of MYCN-mediated ELOVL2 inhibition contributed to epigenetic regulation. MYCN recruited PRC1 (Polycomb repressive complex 1), catalysed H2AK119ub (histone 2A lysine 119 monoubiquitination) and inhibited subsequent ELOVL2 transcription. Conclusions The tumor suppressive properties of DHA and ELOVL2 are repressed by the MYCN and PRC1 jointly, which suggests a new epigenetic mechanism of MYCN-mediated fatty acid regulation and indicates PRC1 inhibition as a potential novel strategy to activate ELOVL2 suppressive functions.
Collapse
Affiliation(s)
- Yi Ding
- Department of Ophthalmology, Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China.,Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai, 200011, China
| | - Jie Yang
- Department of Ophthalmology, Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China.,Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai, 200011, China
| | - Yawen Ma
- Department of Ophthalmology, Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China.,Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai, 200011, China
| | - Tengteng Yao
- Department of Ophthalmology, Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China.,Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai, 200011, China
| | - Xingyu Chen
- Department of Ophthalmology, Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China.,Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai, 200011, China
| | - Shengfang Ge
- Department of Ophthalmology, Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China. .,Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai, 200011, China.
| | - Lihua Wang
- Department of Ophthalmology, Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China. .,Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai, 200011, China.
| | - Xianqun Fan
- Department of Ophthalmology, Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, 200011, China. .,Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai, 200011, China.
| |
Collapse
|
5
|
Aravindan N, Jain D, Somasundaram DB, Herman TS, Aravindan S. Cancer stem cells in neuroblastoma therapy resistance. CANCER DRUG RESISTANCE (ALHAMBRA, CALIF.) 2019; 2:948-967. [PMID: 31867574 PMCID: PMC6924637 DOI: 10.20517/cdr.2019.72] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Neuroblastoma (NB) is the most common cancer of infancy and accounts for nearly one tenth of pediatric cancer deaths. This mortality rate has been attributed to the > 50% frequency of relapse despite intensive, multimodal clinical therapy in patients with progressive NB. Given the disease’s heterogeneity and developed resistance, attaining a cure after relapse of progressive NB is highly challenging. A rapid decrease in the timeline between successive recurrences is likely due to the ongoing acquisition of genetic rearrangements in undifferentiated NB-cancer stem cells (CSCs). In this review, we present the current understanding of NB-CSCs, their intrinsic role in tumorigenesis, their function in disease progression, and their influence on acquired therapy resistance and tumor evolution. In particular, this review focus on the intrinsic involvement of stem cells and signaling in the genesis of NB, the function of pre-existing CSCs in NB progression and therapy response, the formation and influence of induced CSCs (iCSCs) in drug resistance and tumor evolution, and the development of a CSC-targeted therapeutic approach.
Collapse
Affiliation(s)
- Natarajan Aravindan
- Department of Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.,Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.,Department of Anesthesiology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Drishti Jain
- Department of Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Dinesh Babu Somasundaram
- Department of Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Terence S Herman
- Department of Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.,Stephenson Cancer Center, Oklahoma City, OK 73104, USA
| | | |
Collapse
|
6
|
Alptekin A, Ye B, Yu Y, Poole CJ, van Riggelen J, Zha Y, Ding HF. Glycine decarboxylase is a transcriptional target of MYCN required for neuroblastoma cell proliferation and tumorigenicity. Oncogene 2019; 38:7504-7520. [PMID: 31444411 PMCID: PMC6908766 DOI: 10.1038/s41388-019-0967-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 08/05/2019] [Accepted: 08/09/2019] [Indexed: 12/12/2022]
Abstract
Genomic amplification of the oncogene MYCN is a major driver in the development of high-risk neuroblastoma, a pediatric cancer with poor prognosis. Given the challenge in targeting MYCN directly for therapy, we sought to identify MYCN-dependent metabolic vulnerabilities that can be targeted therapeutically. Here, we report that the gene encoding glycine decarboxylase (GLDC), which catalyzes the first and rate-limiting step in glycine breakdown with the production of the one-carbon unit 5,10-methylene-tetrahydrofolate, is a direct transcriptional target of MYCN. As a result, GLDC expression is markedly elevated in MYCN-amplified neuroblastoma tumors and cell lines. This transcriptional upregulation of GLDC expression is of functional significance, as GLDC depletion by RNA interference inhibits the proliferation and tumorigenicity of MYCN-amplified neuroblastoma cell lines by inducing G1 arrest. Metabolomic profiling reveals that GLDC knockdown disrupts purine and central carbon metabolism and reduces citrate production, leading to a decrease in the steady-state levels of cholesterol and fatty acids. Moreover, blocking purine or cholesterol synthesis recapitulates the growth inhibitory effect of GLDC knockdown. These findings reveal a critical role of GLDC in sustaining the proliferation of neuroblastoma cells with high-level GLDC expression and suggest that MYCN amplification is a biomarker for GLDC-based therapeutic strategies against high-risk neuroblastoma.
Collapse
Affiliation(s)
- Ahmet Alptekin
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.,Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA
| | - Bingwei Ye
- Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA
| | - Yajie Yu
- Institute of Neural Regeneration and Repair and Department of Neurology, The First Hospital of Yichang, Three Gorges University College of Medicine, 443000, Yichang, China
| | - Candace J Poole
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.,Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA
| | - Jan van Riggelen
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.,Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA
| | - Yunhong Zha
- Institute of Neural Regeneration and Repair and Department of Neurology, The First Hospital of Yichang, Three Gorges University College of Medicine, 443000, Yichang, China
| | - Han-Fei Ding
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA. .,Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA. .,Department of Pathology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| |
Collapse
|
7
|
Xia Y, Ye B, Ding J, Yu Y, Alptekin A, Thangaraju M, Prasad PD, Ding ZC, Park EJ, Choi JH, Gao B, Fiehn O, Yan C, Dong Z, Zha Y, Ding HF. Metabolic Reprogramming by MYCN Confers Dependence on the Serine-Glycine-One-Carbon Biosynthetic Pathway. Cancer Res 2019; 79:3837-3850. [PMID: 31088832 DOI: 10.1158/0008-5472.can-18-3541] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 03/26/2019] [Accepted: 05/09/2019] [Indexed: 12/19/2022]
Abstract
MYCN amplification drives the development of neuronal cancers in children and adults. Given the challenge in therapeutically targeting MYCN directly, we searched for MYCN-activated metabolic pathways as potential drug targets. Here we report that neuroblastoma cells with MYCN amplification show increased transcriptional activation of the serine-glycine-one-carbon (SGOC) biosynthetic pathway and an increased dependence on this pathway for supplying glucose-derived carbon for serine and glycine synthesis. Small molecule inhibitors that block this metabolic pathway exhibit selective cytotoxicity to MYCN-amplified cell lines and xenografts by inducing metabolic stress and autophagy. Transcriptional activation of the SGOC pathway in MYCN-amplified cells requires both MYCN and ATF4, which form a positive feedback loop, with MYCN activation of ATF4 mRNA expression and ATF4 stabilization of MYCN protein by antagonizing FBXW7-mediated MYCN ubiquitination. Collectively, these findings suggest a coupled relationship between metabolic reprogramming and increased sensitivity to metabolic stress, which could be exploited as a strategy for selective cancer therapy. SIGNIFICANCE: This study identifies a MYCN-dependent metabolic vulnerability and suggests a coupled relationship between metabolic reprogramming and increased sensitivity to metabolic stress, which could be exploited for cancer therapy.See related commentary by Rodriguez Garcia and Arsenian-Henriksson, p. 3818.
Collapse
Affiliation(s)
- Yingfeng Xia
- Institute of Neural Regeneration and Repair and Department of Neurology, The First Hospital of Yichang, Three Gorges University College of Medicine, Yichang, China
| | - Bingwei Ye
- Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, Georgia
| | - Jane Ding
- Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, Georgia
| | - Yajie Yu
- Institute of Neural Regeneration and Repair and Department of Neurology, The First Hospital of Yichang, Three Gorges University College of Medicine, Yichang, China
| | - Ahmet Alptekin
- Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, Georgia
| | - Muthusamy Thangaraju
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, Georgia
| | - Puttur D Prasad
- Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, Georgia
| | - Zhi-Chun Ding
- Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, Georgia.,Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, Georgia
| | - Eun Jeong Park
- Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, Georgia
| | - Jeong-Hyeon Choi
- National Marine Bio-Resources and Information Center, National Marine Biodiversity Institute of Korea, Chungchungnam-do, Republic of Korea
| | - Bei Gao
- NIH West Coast Metabolomics Center, University of California, Davis, California
| | - Oliver Fiehn
- NIH West Coast Metabolomics Center, University of California, Davis, California
| | - Chunhong Yan
- Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, Georgia.,Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, Georgia
| | - Zheng Dong
- Department of Cell Biology and Anatomy, Medical College of Georgia, Augusta University, Augusta, Georgia.,Charlie Norwood VA Medical Center, Augusta, Georgia
| | - Yunhong Zha
- Institute of Neural Regeneration and Repair and Department of Neurology, The First Hospital of Yichang, Three Gorges University College of Medicine, Yichang, China.
| | - Han-Fei Ding
- Georgia Cancer Center, Medical College of Georgia, Augusta University, Augusta, Georgia. .,Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta University, Augusta, Georgia.,Department of Pathology, Medical College of Georgia, Augusta University, Augusta, Georgia
| |
Collapse
|
8
|
Zhu S, Liu W, Ding HF, Cui H, Yang L. BMP4 and Neuregulin regulate the direction of mouse neural crest cell differentiation. Exp Ther Med 2019; 17:3883-3890. [PMID: 31007733 PMCID: PMC6468403 DOI: 10.3892/etm.2019.7439] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 11/09/2018] [Indexed: 12/29/2022] Open
Abstract
The neural crest is a transient embryonic tissue that initially generates neural crest stem cells, which then migrate throughout the body to give rise to a variety of mature tissues. It was proposed that the fate of neural crest cells is gradually determined via environmental cues from the surrounding tissues. In the present study, neural crest cells were isolated and identified from mouse embryos. Bone morphogenetic protein 4 (BMP4) and Neuregulin (NRG) were employed to induce the differentiation of neural crest cells. Treatment with BMP4 revealed neuron-associated differentiation; cells treated with NRG exhibited differentiation into the Schwann cell lineage, a type of glia. Soft agar clonogenic and neurosphere formation assays were conducted to investigate the effects of N-Myc (MYCN) overexpression in neural crest cells; the number of colonies and neurospheres notably increased after 14 days. These findings demonstrated that the direction of cell differentiation may be affected by altering the factors present in the surrounding environment. In addition, MYCN may serve a key role in regulating neural crest cell differentiation.
Collapse
Affiliation(s)
- Shunqin Zhu
- School of Life Sciences, Southwest University, Chongqing 400715, P.R. China.,State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, P.R. China
| | - Wanhong Liu
- School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, P.R. China
| | - Han-Fei Ding
- Cancer Center, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA
| | - Hongjuan Cui
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, P.R. China
| | - Liqun Yang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, P.R. China
| |
Collapse
|
9
|
Zhao H, Wang J, Zhang Y, Yuan M, Yang S, Li L, Yang H. Prognostic Values of CCNE1 Amplification and Overexpression in Cancer Patients: A Systematic Review and Meta-analysis. J Cancer 2018; 9:2397-2407. [PMID: 30026836 PMCID: PMC6036712 DOI: 10.7150/jca.24179] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 05/01/2018] [Indexed: 12/26/2022] Open
Abstract
A number of studies revealed that CCNE1 copy number amplification and overexpression (on mRNA or protein expression level) were associated with prognosis of diverse cancers, however, the results were inconsistent among studies. So we conducted this systematic review and meta-analysis to investigate the prognostic values of CCNE1 amplification and overexpression in cancer patients. PubMed, Cochrane library, Embase, CNKI and WanFang database (last update by February 15, 2018) were searched for literatures. A total of 20 studies were included and 5 survival assessment parameters were measured in this study, which included overall survival (OS), progression free survival (PFS), recurrence free survival (RFS), cancer specific survival (CSS) and distant metastasis free survival (DMFS). Pooled analyses showed that CCNE1 amplification might predict poor OS (HR=1.59, 95% CI: 1.05-2.40, p=0.027) rather than PFS (HR=1.49, 95% CI: 0.83-2.67, p=0.177) and RFS (HR=0.982, 95% CI: 0.2376-4.059, p=0.9801) in various cancers; CCNE1 overexpression significantly correlated with poor OS (HR=1.52, 95% CI: 1.05-2.20, p=0.027), PFS (HR=1.20, 95% CI: 1.07-1.34, p=0.001) and DMFS (HR=1.62, 95% CI: 1.09-2.40, p=0.017) rather than RFS (HR=1.68, 95% CI: 0.81-3.50, p=0.164) and CSS (HR=1.54, 95% CI: 0.74-3.18, p=0.246). On the whole, these results indicated CCNE1 amplification and overexpression were associated with poor survival of patients with cancer, suggesting that CCNE1 might be an effective prognostic signature for cancer patients.
Collapse
Affiliation(s)
- Haiyue Zhao
- Center of Reproduction and Genetics, Suzhou Municipal Hospital, Affiliated Suzhou Hospital of Nanjing Medical University, 26 Daoqian Road, Suzhou, Jiangsu 215002, China
| | - Junling Wang
- Department of Gynaecology, Huangshi Maternity And Children's Health Hospital Edong Healthcare Group, No.80 Guilin Road, Huangshi 43500, China
| | - Yong Zhang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Soochow University, No.188 Shizi Road, Suzhou 215006, China
| | - Ming Yuan
- Department of Gynaecology, Huangshi Maternity And Children's Health Hospital Edong Healthcare Group, No.80 Guilin Road, Huangshi 43500, China
| | - Shuangxiang Yang
- Department of Gynaecology, Huangshi Maternity And Children's Health Hospital Edong Healthcare Group, No.80 Guilin Road, Huangshi 43500, China
| | - Lisong Li
- Department of Orthopedic Surgery, The First Affiliated Hospital of Soochow University, No.188 Shizi Road, Suzhou 215006, China
| | - Huilin Yang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Soochow University, No.188 Shizi Road, Suzhou 215006, China
| |
Collapse
|
10
|
Sakka L, Delétage N, Chalus M, Aissouni Y, Sylvain-Vidal V, Gobron S, Coll G. Assessment of citalopram and escitalopram on neuroblastoma cell lines. Cell toxicity and gene modulation. Oncotarget 2018; 8:42789-42807. [PMID: 28467792 PMCID: PMC5522106 DOI: 10.18632/oncotarget.17050] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 03/15/2017] [Indexed: 12/13/2022] Open
Abstract
Selective serotonin reuptake inhibitors (SSRI) are common antidepressants which cytotoxicity has been assessed in cancers notably colorectal carcinomas and glioma cell lines. We assessed and compared the cytotoxicity of 2 SSRI, citalopram and escitalopram, on neuroblastoma cell lines. The study was performed on 2 non-MYCN amplified cell lines (rat B104 and human SH-SY5Y) and 2 human MYCN amplified cell lines (IMR32 and Kelly). Citalopram and escitalopram showed concentration-dependent cytotoxicity on all cell lines. Citalopram was more cytotoxic than escitalopram. IMR32 was the most sensitive cell line. The absence of toxicity on human primary Schwann cells demonstrated the safety of both molecules for myelin. The mechanisms of cytotoxicity were explored using gene-expression profiles and quantitative real-time PCR (qPCR). Citalopram modulated 1 502 genes and escitalopram 1 164 genes with a fold change ≥ 2. 1 021 genes were modulated by both citalopram and escitalopram; 481 genes were regulated only by citalopram while 143 genes were regulated only by escitalopram. Citalopram modulated 69 pathways (KEGG) and escitalopram 42. Ten pathways were differently modulated by citalopram and escitalopram. Citalopram drastically decreased the expression of MYBL2, BIRC5 and BARD1 poor prognosis factors of neuroblastoma with fold-changes of -107 (p<2.26 10−7), -24.1 (p<5.6 10−9) and -17.7 (p<1.2 10−7). CCNE1, AURKA, IGF2, MYCN and ERBB2 were more moderately down-regulated by both molecules. Glioma markers E2F1, DAPK1 and CCND1 were down-regulated. Citalopram displayed more powerful action with broader and distinct spectrum of action than escitalopram.
Collapse
Affiliation(s)
- Laurent Sakka
- Laboratoire d'Anatomie et d'Organogenèse, Laboratoire de Biophysique Sensorielle, NeuroDol, Faculté de Médecine, Université Clermont Auvergne, F-63000 Clermont-Ferrand, France.,Service de Neurochirurgie, Pole RMND, CHU de Clermont-Ferrand, Hôpital Gabriel-Montpied, 63003 Clermont-Ferrand Cedex, France
| | - Nathalie Delétage
- Neuronax SAS, Biopôle Clermont-Limagne, F-63360 Saint-Beauzire, France
| | - Maryse Chalus
- Laboratoire d'Anatomie et d'Organogenèse, Laboratoire de Biophysique Sensorielle, NeuroDol, Faculté de Médecine, Université Clermont Auvergne, F-63000 Clermont-Ferrand, France
| | - Youssef Aissouni
- Laboratoire de Pharmacologie Fondamentale et Clinique de la Douleur, NeuroDol, Faculté de Médecine, Université Clermont Auvergne, F-63000 Clermont-Ferrand, France
| | | | - Stéphane Gobron
- Neuronax SAS, Biopôle Clermont-Limagne, F-63360 Saint-Beauzire, France
| | - Guillaume Coll
- Service de Neurochirurgie, Pole RMND, CHU de Clermont-Ferrand, Hôpital Gabriel-Montpied, 63003 Clermont-Ferrand Cedex, France
| |
Collapse
|
11
|
Neuroblastoma cells depend on HDAC11 for mitotic cell cycle progression and survival. Cell Death Dis 2017; 8:e2635. [PMID: 28252645 PMCID: PMC5386552 DOI: 10.1038/cddis.2017.49] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 12/01/2016] [Accepted: 01/25/2017] [Indexed: 12/19/2022]
Abstract
The number of long-term survivors of high-risk neuroblastoma remains discouraging, with 10-year survival as low as 20%, despite decades of considerable international efforts to improve outcome. Major obstacles remain and include managing resistance to induction therapy, which causes tumor progression and early death in high-risk patients, and managing chemotherapy-resistant relapses, which can occur years after the initial diagnosis. Identifying and validating novel therapeutic targets is essential to improve treatment. Delineating and deciphering specific functions of single histone deacetylases in neuroblastoma may support development of targeted acetylome-modifying therapeutics for patients with molecularly defined high-risk neuroblastoma profiles. We show here that HDAC11 depletion in MYCN-driven neuroblastoma cell lines strongly induces cell death, mostly mediated by apoptotic programs. Genes necessary for mitotic cell cycle progression and cell division were most prominently enriched in at least two of three time points in whole-genome expression data combined from two cell systems, and all nine genes in these functional categories were strongly repressed, including CENPA, KIF14, KIF23 and RACGAP1. Enforced expression of one selected candidate, RACGAP1, partially rescued the induction of apoptosis caused by HDAC11 depletion. High-level expression of all nine genes in primary neuroblastomas significantly correlated with unfavorable overall and event-free survival in patients, suggesting a role in mediating the more aggressive biological and clinical phenotype of these tumors. Our study identified a group of cell cycle-promoting genes regulated by HDAC11, being both predictors of unfavorable patient outcome and essential for tumor cell viability. The data indicate a significant role of HDAC11 for mitotic cell cycle progression and survival of MYCN-amplified neuroblastoma cells, and suggests that HDAC11 could be a valuable drug target.
Collapse
|
12
|
A Novel Aspect of Tumorigenesis-BMI1 Functions in Regulating DNA Damage Response. Biomolecules 2015; 5:3396-415. [PMID: 26633535 PMCID: PMC4693283 DOI: 10.3390/biom5043396] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 10/23/2015] [Accepted: 11/26/2015] [Indexed: 12/27/2022] Open
Abstract
BMI1 plays critical roles in maintaining the self-renewal of hematopoietic, neural, intestinal stem cells, and cancer stem cells (CSCs) for a variety of cancer types. BMI1 promotes cell proliferative life span and epithelial to mesenchymal transition (EMT). Upregulation of BMI1 occurs in multiple cancer types and is associated with poor prognosis. Mechanistically, BMI1 is a subunit of the Polycomb repressive complex 1 (PRC1), and binds the catalytic RING2/RING1b subunit to form a functional E3 ubiquitin ligase. Through mono-ubiquitination of histone H2A at lysine 119 (H2A-K119Ub), BMI1 represses multiple gene loci; among these, the INK4A/ARF locus has been most thoroughly investigated. The locus encodes the p16INK4A and p14/p19ARF tumor suppressors that function in the pRb and p53 pathways, respectively. Its repression contributes to BMI1-derived tumorigenesis. BMI1 also possesses other oncogenic functions, specifically its regulative role in DNA damage response (DDR). In this process, BMI1 ubiquitinates histone H2A and γH2AX, thereby facilitating the repair of double-stranded DNA breaks (DSBs) through stimulating homologous recombination and non-homologous end joining. Additionally, BMI1 compromises DSB-induced checkpoint activation independent of its-associated E3 ubiquitin ligase activity. We review the emerging role of BMI1 in DDR regulation and discuss its impact on BMI1-derived tumorigenesis.
Collapse
|
13
|
Vriend J, Ghavami S, Marzban H. The role of the ubiquitin proteasome system in cerebellar development and medulloblastoma. Mol Brain 2015; 8:64. [PMID: 26475605 PMCID: PMC4609148 DOI: 10.1186/s13041-015-0155-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 10/08/2015] [Indexed: 01/12/2023] Open
Abstract
Cerebellar granule cells precursors are derived from the upper rhombic lip and migrate tangentially independent of glia along the subpial stream pathway to form the external germinal zone. Postnatally, granule cells migrate from the external germinal zone radially through the Purkinje cell layer, guided by Bergmann glia fibers, to the internal granular cell layer. Medulloblastomas (MBs) are the most common malignant childhood brain tumor. Many of these tumors develop from precursor cells of the embryonic rhombic lips. Four main groups of MB are recognized. The WNT group of MBs arise primarily from the lower rhombic lip and embryonic brainstem. The SHH group of MBs originate from cerebellar granule cell precursors in the external germinal zone of the embryonic cerebellum. The cellular origins of type 3 and type 4 MBs are not clear. Several ubiquitin ligases are revealed to be significant factors in development of the cerebellum as well as in the initiation and maintenance of MBs. Proteasome dysfunction at a critical stage of development may be a major factor in determining whether progenitor cells which are destined to become granule cells differentiate normally or become MB cells. We propose the hypothesis that proteasomal activity is essential to regulate the critical transition between proliferating granule cells and differentiated granule cells and that proteasome dysfunction may lead to MB. Proteasome dysfunction could also account for various mutations in MBs resulting from deficiencies in DNA checkpoint and repair mechanisms prior to development of MBs. Data showing a role for the ubiquitin ligases β-TrCP, FBW7, Huwe1, and SKP2 in MBs suggest the possibility of a classification of MBs based on the expression (over expression or under expression) of specific ubiquitin ligases which function as oncogenes, tumor suppressors or cell cycle regulators.
Collapse
Affiliation(s)
- Jerry Vriend
- Department of Human Anatomy and Cell Science, Rm129, BMSB, 745 Bannatyne Avenue, Winnipeg, MB, Canada
| | - Saeid Ghavami
- Department of Human Anatomy and Cell Science, Rm129, BMSB, 745 Bannatyne Avenue, Winnipeg, MB, Canada.,Children's Hospital Research Institute of Manitoba (CHRIM), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, R3E 0J9, Canada
| | - Hassan Marzban
- Department of Human Anatomy and Cell Science, Rm129, BMSB, 745 Bannatyne Avenue, Winnipeg, MB, Canada. .,Children's Hospital Research Institute of Manitoba (CHRIM), College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, R3E 0J9, Canada.
| |
Collapse
|
14
|
Cao Z, Li X, Li J, Luo W, Huang C, Chen J. X-linked inhibitor of apoptosis protein (XIAP) lacking RING domain localizes to the nuclear and promotes cancer cell anchorage-independent growth by targeting the E2F1/Cyclin E axis. Oncotarget 2015; 5:7126-37. [PMID: 25216527 PMCID: PMC4196189 DOI: 10.18632/oncotarget.2227] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The inhibitor of apoptosis protein XIAP (X-linked inhibitor of apoptosis protein) is a well-documented protein that is located in cytoplasm acting as a potent regulator of cell apoptosis. Here, we showed that expressing XIAP with RING (Really Interesting New Gene) domain deletion (XIAPΔRING) in cancer cells promoted cancer cell anchorage-independent growth and G1/S phase transition companied with increasing cyclin e transcription activity and protein expression. Further studies revealed that XIAPΔRING was mainly localized in nuclear with increased binding with E2F1, whereas XIAP with BIR (Baculoviral IAP Repeat) domains deletion (XIAPΔBIRs) was entirely presented in cytoplasma with losing its binding with E2F1, suggesting that RING domain was able to inhibit BIR domains nuclear localization, by which impaired BIRs binding with E2F1 in cellular nucleus in intact cells. These studies identified a new function of XIAP protein in cellular nucleus is to regulate E2F1 transcriptional activity by binding with E2F1 in cancer cells. Our current finding of an effect of XIAPΔRING expression on cancer cell anchorage-independent growth suggests that overexpression of this protein may contribute to genetic instability associated with cell cycle and checkpoint perturbations, in addition to its impact on cellular apoptosis.
Collapse
Affiliation(s)
- Zipeng Cao
- Department of Occupational and Environmental Health and Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Fourth Military Medical University, Xi'an, China. Nelson Institute of Environmental Medicine, New York University School of Medicine, Tuxedo, NY, USA
| | - Xueyong Li
- Department of Plastic and Burn Surgery, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Jingxia Li
- Nelson Institute of Environmental Medicine, New York University School of Medicine, Tuxedo, NY, USA
| | - Wenjing Luo
- Department of Occupational and Environmental Health and Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Fourth Military Medical University, Xi'an, China
| | - Chuanshu Huang
- Nelson Institute of Environmental Medicine, New York University School of Medicine, Tuxedo, NY, USA
| | - Jingyuan Chen
- Department of Occupational and Environmental Health and Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, School of Public Health, Fourth Military Medical University, Xi'an, China
| |
Collapse
|
15
|
Wang YD, Su YJ, Li JY, Yao XC, Liang GJ. Rapamycin, a mTOR inhibitor, induced growth inhibition in retinoblastoma Y79 cell via down-regulation of Bmi-1. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2015; 8:5182-5188. [PMID: 26191215 PMCID: PMC4503087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 04/15/2015] [Indexed: 06/04/2023]
Abstract
Rapamycin is useful in the treatment of certain cancers by inhibiting mTOR(mammalian target of rapamycin) pathway. Here, anticancer activity and its acting mechanisms of rapamycin were investigated in human retinoblastoma Y79 cells. CCK-8 assay showed that the IC50 value of rapamycin against human retinoblastoma Y79 cells was 0.122±0.026 μmol/L. Flow cytometry analysis indicated that rapamycin induced G1 cell cycle arrest. Western blot assay demonstrated that the mTOR pathway in Y79 cells was blocked by rapamycin. Western blot and RT-PCR assay showed that Bmi-1 was downregulated in protein and mRNA level by rapamycin treatment. Further Western blot and RNA interference assays showed that rapamycin-mediated downregulation of Bmi-1 induced decreases of cyclin E1, which accounted for rapamycin-mediated G1 cell cycle arrest in human retinoblastoma cells. Together, all these results illustrated that rapamycin induced growth inhibition of human retinoblastoma cells, and inactive of mTOR pathway and downregulation of Bmi-1 was involved in its action mechanism.
Collapse
Affiliation(s)
- Yan-Dong Wang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen UniversityGuangzhou 510060, China
| | - Yong-Jing Su
- The First Affiliated Hospital, Sun Yat-Sen UniversityGuangzhou 510080, China
| | - Jian-Ying Li
- The First Affiliated Hospital, Sun Yat-Sen UniversityGuangzhou 510080, China
| | - Xiang-Chao Yao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen UniversityGuangzhou 510060, China
| | - Guang-Jiang Liang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen UniversityGuangzhou 510060, China
| |
Collapse
|
16
|
Epigenetic basis of opiate suppression of Bdnf gene expression in the ventral tegmental area. Nat Neurosci 2015; 18:415-22. [PMID: 25643298 PMCID: PMC4340719 DOI: 10.1038/nn.3932] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 12/22/2014] [Indexed: 12/15/2022]
Abstract
Brain-derived neurotrophic factor (BDNF) plays a crucial role in modulating neural and behavioral plasticity to drugs of abuse. Here, we demonstrate a persistent down-regulation of exon-specific Bdnf expression in the ventral tegmental area (VTA) in response to chronic opiate exposure, which is mediated by specific epigenetic modifications at the corresponding Bdnf gene promoters. Exposure to chronic morphine increases stalling of RNA polymerase II at these Bdnf promoters in VTA and alters permissive and repressive histone modifications and occupancy of their regulatory proteins at the specific promoters. Furthermore, we show that morphine suppresses binding of phospho-CREB (cAMP response element binding protein) to Bdnf promoters in VTA, which results from enrichment of trimethylated H3K27 at the promoters, and that decreased NURR1 (nuclear receptor related-1) expression also contributes to Bdnf repression and associated behavioral plasticity to morphine. These studies reveal novel epigenetic mechanisms of morphine-induced molecular and behavioral neuroadaptations.
Collapse
|
17
|
Luo Q, Wei C, Li X, Li J, Chen L, Huang Y, Song H, Li D, Fang L. MicroRNA-195-5p is a potential diagnostic and therapeutic target for breast cancer. Oncol Rep 2014; 31:1096-102. [PMID: 24402230 PMCID: PMC3926672 DOI: 10.3892/or.2014.2971] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 12/23/2013] [Indexed: 11/05/2022] Open
Abstract
MicroRNAs (miRNAs) are a class of highly conserved, small endogenous single-strand non-coding RNAs. They are aberrantly expressed in the circulation and tissue of patients with cancer. Therefore, it has been suggested that they may act as key regulators of carcinogenesis. The aim of the present study was to examine the expression level of miR-195-5p in human breast cancer and its potential role in carcinogenesis. The expression level of miR-195-5p was measured in 40 breast cancer specimens and adjacent normal breast tissues by quantitative polymerase chain reaction (qPCR). Next, to explore the potential function of miR-195-5p, we used MDA-MB-231 human breast cancer cells and carried out MTT, colony formation, Transwell chamber migration and cell cycle assays. The dual-luciferase reporter assay was also performed to determine putative targets of miR-195-5p, which were validated using qPCR and western blot assays. We found that miR-195-5p expression was significantly decreased in the 40 breast cancer specimens when compared with that in the adjacent normal breast tissues (P<0.05). Overexpression of miR-195-5p inhibited cell proliferation, reduced cell colony formation, suppressed cell migration and caused an accumulation of cells in the G1 phase of the cell cycle. In the 3'-untranslated region (3'-UTR) of cyclin E1 (CCNE1), we found two putative target sites which may bind miR-195-5p, suggesting that CCNE1 is a direct target of miR-195-5p. Furthermore, through qPCR and western blot assays we showed that overexpression of miR-195-5p reduced CCNE1 mRNA and protein levels, respectively. Our study suggests that miR-195-5p may act as a tumor suppressor in breast cancer. Therefore, targeting of this miRNA may provide a novel strategy for the diagnosis and treatment of patients with this lethal disease.
Collapse
Affiliation(s)
- Qifeng Luo
- Department of General Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Chuankui Wei
- Department of General Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Xiaoyu Li
- Department of General Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Jia Li
- Department of Microbiology and Genetic Institute, Paris-Sud 11 University, Paris, France
| | - Lei Chen
- Department of General Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Yixiang Huang
- Department of General Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Hongming Song
- Department of General Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Dengfeng Li
- Department of General Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| | - Lin Fang
- Department of General Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
| |
Collapse
|