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Zhu G, Zhao T. Deep-gKnock: Nonlinear group-feature selection with deep neural networks. Neural Netw 2021; 135:139-147. [PMID: 33385830 DOI: 10.1016/j.neunet.2020.12.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 11/26/2020] [Accepted: 12/02/2020] [Indexed: 01/21/2023]
Abstract
Feature selection is central to contemporary high-dimensional data analysis. Group structure among features arises naturally in various scientific problems. Many methods have been proposed to incorporate the group structure information into feature selection. However, these methods are normally restricted to a linear regression setting. To relax the linear constraint, we design a new Deep Neural Network (DNN) architecture and integrating it with the recently proposed knockoff technique to perform nonlinear group-feature selection with controlled group-wise False Discovery Rate (gFDR). Experimental results on high-dimensional synthetic data demonstrate that our method achieves the highest power and accurate gFDR control compared with state-of-the-art methods. The performance of Deep-gKnock is especially superior in the following five situations: (1) nonlinearity relationship; (2) dimension p greater than sample size n; (3) high between-group correlation; (4) high within-group correlation; (5) large number of associated groups. And Deep-gKnock is also demonstrated to be robust to the misspecification of the feature distribution and the change of network architecture. Moreover, Deep-gKnock achieves scientifically meaningful group-feature selection results for cutting-edge real world datasets.
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Affiliation(s)
- Guangyu Zhu
- Department of Computer Science and Statistics, University of Rhode Island, United States of America.
| | - Tingting Zhao
- Department of Electrical and Computer Engineering, Northeastern University, United States of America
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Liu W, Cai T, Li L, Chen H, Chen R, Zhang M, Zhang W, Zhao L, Xiong H, Qin P, Gao X, Jiang Q. MiR-200a Regulates Nasopharyngeal Carcinoma Cell Migration and Invasion by Targeting MYH10. J Cancer 2020; 11:3052-3060. [PMID: 32226520 PMCID: PMC7086266 DOI: 10.7150/jca.40438] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 01/04/2020] [Indexed: 12/17/2022] Open
Abstract
Nasopharyngeal carcinoma (NPC), is one of the most common malignant tumor in southern China and southeast Asia. MYH10 is a coding gene of the NMMHC-IIB protein. Previous studies have shown that MYH10 expression was up-regulated in breast cancer, glioma and meningioma. Moreover, it was targeted by miR200 family. However, no relevant studies have been found in NPC. In present study, we found in 48 NPC specimens, MYH10 level was lower in most cancer areas than that in the adjacent normal tissue. Moreover, the depletion of MYH10 can promote the migration and invasion of NPC. In addition, we demonstrated that miR-200a has the strongest regulation to MYH10 among miR-200 family. miR-200a mimics could decrease MYH10 expression, while miR-200a inhibitor increase MYH10 expression. Next, we found that miR-200a bound directly to MYH10 using Dual-luciferase reporter. Finally, it was demonstrated that siMYH10 could reverse the effect of miR-200a inhibitor on NPC cell migration and invasion. Taken together, it can be concluded that MYH10 is lowly expressed in NPC compared with adjacent tissues, and the loss of MYH10 can promote the migration and invasion of NPC cells; Among the miR-200 family, miR-200a has the strongest regulatory effect on MYH10; MYH10 is a direct target gene of miR200a, and miR200a targets MYH10 to regulate the migration and invasion of NPC cells.
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Affiliation(s)
- Wenya Liu
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150.,Department of Pathology, the First Affiliated Hospital, Anhui Medical University, Hefei, China 230022
| | - Tonghui Cai
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
| | - Lingjun Li
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
| | - Hui Chen
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
| | - Ruichao Chen
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
| | - Minfen Zhang
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
| | - Wei Zhang
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
| | - Li Zhao
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
| | - Hanzhen Xiong
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
| | - Ping Qin
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
| | - Xingcheng Gao
- The First Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 511436
| | - Qingping Jiang
- Department of Pathology, the Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, China 510150
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Dias KB, Flores APC, Hildebrand LC, de Oliveira MG, Lamers ML, Rados PV, Magnusson AS, Filho MS. Non-muscle myosin II as a predictive factor in head and neck squamous cell carcinoma. Med Oral Patol Oral Cir Bucal 2019; 24:e346-e353. [PMID: 31011146 PMCID: PMC6530949 DOI: 10.4317/medoral.22898] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 02/27/2019] [Indexed: 12/11/2022] Open
Abstract
Background The present study attempted to provide information regarding non-muscle myosin II (MII) isoforms immunoreactivity in patients with head and neck squamous cell carcinoma (HNSCC) and analysis of the patients’ clinical status after 5 years of monitoring. Material and Methods A semiquantitative analysis of the immunoreactivity of the MII isoforms was performed in 54 surgical specimens and its correlation with clinical and pathological variables and prognosis was verified. Data were analyzed using chi-square, Mann-Whitney and Kruskal-Wallis tests. To evaluate the survival over the total monitoring time and any connection with the proteins studied, the Kaplan-Meier analysis was used. P values ≤0.05 were considered statistically significant. Results In the advanced stages of pathological tumor-node-metastasis, the expression of MIIB in adjacent non-neoplastic epithelial tissues tended to increase (p = 0.057). In tumoral zones there was an association of high expression among the three isoforms (MIIA/MIIB p=0,001, MIIB/MIIC p=0,006 and MIIA/MIIC p=0,012). Negative clinical evolution in patients was directly correlated to increased MIIC expression in the tumoral zone of invasion in HNSCC (p = 0.017). Based on clinical evolution after the monitoring period, patients with tumors expressing MIIC had poorer prognoses (p = 0.048). Conclusions The present study suggests that MIIB expression in non-neoplastic adjacent epithelial tissues may indicate a potential for regional metastasis and that MIIC expression in the tumoral zone of invasion is predictive of negative evolution of the disease. Key words:Head and neck squamous cell carcinoma, oral cancer, myosin type II, non-muscle myosin, immunohistochemistry.
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Affiliation(s)
- K-B Dias
- Departmentof Oral Pathology, School of Dentistry, Universidade Federal do Rio Grande do Sul, Av Ramiro Barcelos 2492/503, 90035-003 - Porto Alegre, Rio Grande do Sul, Brazil,
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Xie X, Wang X, Liao W, Fei R, Wu N, Cong X, Chen Q, Wei L, Wang Y, Chen H. MYL6B, a myosin light chain, promotes MDM2-mediated p53 degradation and drives HCC development. J Exp Clin Cancer Res 2018; 37:28. [PMID: 29439719 PMCID: PMC5812214 DOI: 10.1186/s13046-018-0693-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 01/31/2018] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Identification of novel MDM2 or p53 binding proteins may reveal undefined oncogenes, tumor suppressors, signaling pathways and possible treatment targets. METHODS By means of immunoprecipitation and Mass Spectrometry analysis, we aimed to identify novel regulators of the MDM2-p53 pathway. We further clarified the impact of MYL6B on the p53 protein level and on the process of apoptosis. We also investigated the role of MYL6B in hepatocellular carcinoma by clone formation assay and by determining the correlation between its expression and prognosis of HCC patients. RESULTS We identified a novel MDM2 and p53 binding protein, MYL6B. It is a myosin light chain that could bind myosin II heavy chains to form non-muscle myosin II holoenzymes (NMII). We found that MYL6B could facilitate the binding of MDM2 to p53, which consequently promotes the ubiquitination and degradation of p53 protein. We further proved that MYL6B exerts the suppression effect on p53 as part of NMII holoenzymes because inhibiting the ATPase activity of myosin II heavy chain largely blocked this effect. We also discovered that MYL6B is overexpressed in HCC tissues and linked to the bad prognosis of HCC patients. Knocking out of MYL6B dramatically suppressed the clonogenic ability and increased the apoptosis level of HCC cell lines. CONCLUSIONS To summary, our results demonstrate that MYL6B is a putative tumor driver gene in HCC which could promote the degradation of p53 by enhancing its' MDM2-mediated ubiquitination.
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Affiliation(s)
- Xingwang Xie
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Disease, Beijing, 100044, China
- Chinese Center for Disease Control and Prevention, Beijing, 102206, China
| | - Xueyan Wang
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Disease, Beijing, 100044, China
| | - Weijia Liao
- Laboratory of Hepatobiliary and Pancreatic Surgery, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Ran Fei
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Disease, Beijing, 100044, China
| | - Nan Wu
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Disease, Beijing, 100044, China
| | - Xu Cong
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Disease, Beijing, 100044, China
| | - Qian Chen
- Laboratory of Hepatobiliary and Pancreatic Surgery, Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Lai Wei
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Disease, Beijing, 100044, China
| | - Yu Wang
- Chinese Center for Disease Control and Prevention, Beijing, 102206, China.
| | - Hongsong Chen
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Disease, Beijing, 100044, China.
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Panzetta V, De Menna M, Musella I, Pugliese M, Quarto M, Netti PA, Fusco S. X-rays effects on cytoskeleton mechanics of healthy and tumor cells. Cytoskeleton (Hoboken) 2016; 74:40-52. [DOI: 10.1002/cm.21334] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 08/09/2016] [Accepted: 08/15/2016] [Indexed: 12/15/2022]
Affiliation(s)
- Valeria Panzetta
- Center for Advanced Biomaterials for Health Care@CRIB - Istituto Italiano di Tecnologia; Largo Barsanti e Matteucci n. 53 Napoli 80125 Italy
| | - Marta De Menna
- Department of Experimental and Clinic Medicine; University of Catanzaro Magna Graecia; Catanzaro Italy
| | - Ida Musella
- Center for Advanced Biomaterials for Health Care@CRIB - Istituto Italiano di Tecnologia; Largo Barsanti e Matteucci n. 53 Napoli 80125 Italy
| | - Mariagabriella Pugliese
- Dipartimento di Fisica; Università Federico II and INFN-Sezione di Napoli; Monte S. Angelo, Via Cintia Napoli 80126 Italy
| | - Maria Quarto
- Dipartimento di Fisica; Università Federico II and INFN-Sezione di Napoli; Monte S. Angelo, Via Cintia Napoli 80126 Italy
| | - Paolo A. Netti
- Center for Advanced Biomaterials for Health Care@CRIB - Istituto Italiano di Tecnologia; Largo Barsanti e Matteucci n. 53 Napoli 80125 Italy
- Interdisciplinary Research Centre on Biomaterials (CRIB), University of Napoli Federico II; P.le Tecchio 80 Napoli 80125 Italy
| | - Sabato Fusco
- Center for Advanced Biomaterials for Health Care@CRIB - Istituto Italiano di Tecnologia; Largo Barsanti e Matteucci n. 53 Napoli 80125 Italy
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Cancer Feature Selection and Classification Using a Binary Quantum-Behaved Particle Swarm Optimization and Support Vector Machine. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2016; 2016:3572705. [PMID: 27642363 PMCID: PMC5013239 DOI: 10.1155/2016/3572705] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 07/27/2016] [Indexed: 11/18/2022]
Abstract
This paper focuses on the feature gene selection for cancer classification, which employs an optimization algorithm to select a subset of the genes. We propose a binary quantum-behaved particle swarm optimization (BQPSO) for cancer feature gene selection, coupling support vector machine (SVM) for cancer classification. First, the proposed BQPSO algorithm is described, which is a discretized version of original QPSO for binary 0-1 optimization problems. Then, we present the principle and procedure for cancer feature gene selection and cancer classification based on BQPSO and SVM with leave-one-out cross validation (LOOCV). Finally, the BQPSO coupling SVM (BQPSO/SVM), binary PSO coupling SVM (BPSO/SVM), and genetic algorithm coupling SVM (GA/SVM) are tested for feature gene selection and cancer classification on five microarray data sets, namely, Leukemia, Prostate, Colon, Lung, and Lymphoma. The experimental results show that BQPSO/SVM has significant advantages in accuracy, robustness, and the number of feature genes selected compared with the other two algorithms.
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Newell-Litwa KA, Horwitz R, Lamers ML. Non-muscle myosin II in disease: mechanisms and therapeutic opportunities. Dis Model Mech 2015; 8:1495-515. [PMID: 26542704 PMCID: PMC4728321 DOI: 10.1242/dmm.022103] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The actin motor protein non-muscle myosin II (NMII) acts as a master regulator of cell morphology, with a role in several essential cellular processes, including cell migration and post-synaptic dendritic spine plasticity in neurons. NMII also generates forces that alter biochemical signaling, by driving changes in interactions between actin-associated proteins that can ultimately regulate gene transcription. In addition to its roles in normal cellular physiology, NMII has recently emerged as a critical regulator of diverse, genetically complex diseases, including neuronal disorders, cancers and vascular disease. In the context of these disorders, NMII regulatory pathways can be directly mutated or indirectly altered by disease-causing mutations. NMII regulatory pathway genes are also increasingly found in disease-associated copy-number variants, particularly in neuronal disorders such as autism and schizophrenia. Furthermore, manipulation of NMII-mediated contractility regulates stem cell pluripotency and differentiation, thus highlighting the key role of NMII-based pharmaceuticals in the clinical success of stem cell therapies. In this Review, we discuss the emerging role of NMII activity and its regulation by kinases and microRNAs in the pathogenesis and prognosis of a diverse range of diseases, including neuronal disorders, cancer and vascular disease. We also address promising clinical applications and limitations of NMII-based inhibitors in the treatment of these diseases and the development of stem-cell-based therapies.
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Affiliation(s)
- Karen A Newell-Litwa
- Department of Cell Biology, University of Virginia, Charlottesville, VA 22908, USA
| | - Rick Horwitz
- Department of Cell Biology, University of Virginia, Charlottesville, VA 22908, USA
| | - Marcelo L Lamers
- Department of Morphological Sciences, Institute of Basic Health Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul 90610-010, Brazil
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PANZETTA VALERIA, DE MENNA MARTA, BUCCI DEBORA, GIOVANNINI VITTORIA, PUGLIESE MARIAGABRIELLA, QUARTO MARIA, FUSCO SABATO, NETTI PAOLO. X-RAY IRRADIATION AFFECTS MORPHOLOGY, PROLIFERATION AND MIGRATION RATE OF HEALTHY AND CANCER CELLS. J MECH MED BIOL 2015. [DOI: 10.1142/s0219519415400229] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Cytoskeleton plays a central role in many cellular processes, such as migration, adhesion and proliferation. Alterations of its structural properties are commonly associated with different diseases (malignancy, cardiac hypertrophy, etc.). In this work, we studied the effects of X-radiations on cytoskeleton architecture of two cell lines: BALBc/3T3 and Simian virus 40-transformed BALBc/3T3 (SVT2) cells. In agreement with the current literature, we observed reduced adhesion and increased motility of SVT2 cells respect to non-transformed BALBc/3T3. In addition, we showed that two different doses of X-rays (1 and 2 Gy) increased cell-dish adhesiveness and reduced cell proliferation and cell motility of transformed cells, whereas minor effects were measured on the normal counterpart. These results suggested that low doses or fractioning of X-rays may have a normalization effect on the investigated parameters for the transformed cell phenotype.
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Affiliation(s)
- VALERIA PANZETTA
- Center for Advanced Biomaterials for Health Care@CRIB, Istituto Italiano di Tecnologia, Largo Barsanti e Matteucci, 53, 80125 Napoli, Italy
| | - MARTA DE MENNA
- Interdisciplinary Research Centre on Biomaterials, Federico II University of Naples, Piazzale Tecchio, 80, 80126, Napoli, Italy
| | - DEBORA BUCCI
- Interdisciplinary Research Centre on Biomaterials, Federico II University of Naples, Piazzale Tecchio, 80, 80126, Napoli, Italy
| | - VITTORIA GIOVANNINI
- Interdisciplinary Research Centre on Biomaterials, Federico II University of Naples, Piazzale Tecchio, 80, 80126, Napoli, Italy
| | - MARIAGABRIELLA PUGLIESE
- Dipartimento di Fisica, Università Federico II and INFN-Sezione di Napoli, Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - MARIA QUARTO
- Dipartimento di Fisica, Università Federico II and INFN-Sezione di Napoli, Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
| | - SABATO FUSCO
- Center for Advanced Biomaterials for Health Care@CRIB, Istituto Italiano di Tecnologia, Largo Barsanti e Matteucci, 53, 80125 Napoli, Italy
| | - PAOLO NETTI
- Center for Advanced Biomaterials for Health Care@CRIB, Istituto Italiano di Tecnologia, Largo Barsanti e Matteucci, 53, 80125 Napoli, Italy
- Interdisciplinary Research Centre on Biomaterials, Federico II University of Naples, Piazzale Tecchio, 80, 80126, Napoli, Italy
- Dipartimento di Ingegneria dei Materiali e della Produzione, Universita di Napoli Federico II, 'Piazzale Tecchio 80, 80126, Napoli, Italy
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Li HD, Xu QS, Liang YZ. Random frog: an efficient reversible jump Markov Chain Monte Carlo-like approach for variable selection with applications to gene selection and disease classification. Anal Chim Acta 2012; 740:20-6. [PMID: 22840646 DOI: 10.1016/j.aca.2012.06.031] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 06/13/2012] [Accepted: 06/19/2012] [Indexed: 01/19/2023]
Abstract
The identification of disease-relevant genes represents a challenge in microarray-based disease diagnosis where the sample size is often limited. Among established methods, reversible jump Markov Chain Monte Carlo (RJMCMC) methods have proven to be quite promising for variable selection. However, the design and application of an RJMCMC algorithm requires, for example, special criteria for prior distributions. Also, the simulation from joint posterior distributions of models is computationally extensive, and may even be mathematically intractable. These disadvantages may limit the applications of RJMCMC algorithms. Therefore, the development of algorithms that possess the advantages of RJMCMC methods and are also efficient and easy to follow for selecting disease-associated genes is required. Here we report a RJMCMC-like method, called random frog that possesses the advantages of RJMCMC methods and is much easier to implement. Using the colon and the estrogen gene expression datasets, we show that random frog is effective in identifying discriminating genes. The top 2 ranked genes for colon and estrogen are Z50753, U00968, and Y10871_at, Z22536_at, respectively. (The source codes with GNU General Public License Version 2.0 are freely available to non-commercial users at: http://code.google.com/p/randomfrog/.).
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Affiliation(s)
- Hong-Dong Li
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China
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Ai-Jun Y, Xin-Yuan S. Bayesian variable selection for disease classification using gene expression data. Bioinformatics 2009; 26:215-22. [DOI: 10.1093/bioinformatics/btp638] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Palli SR, Kapitskaya MZ, Potter DW. The influence of heterodimer partner ultraspiracle/retinoid X receptor on the function of ecdysone receptor. FEBS J 2005; 272:5979-90. [PMID: 16302963 DOI: 10.1111/j.1742-4658.2005.05003.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A pair of nuclear receptors, ecdysone receptor (EcR) and ultraspiracle (USP), heterodimerize and transduce ecdysteroid signals. The EcR and its nonsteroidal ligands are being developed for regulation of transgene expression in humans, animals and plants. In mammalian cells, EcR:USP heterodimers can function in the absence of ligand, but EcR/retinoid X receptor (EcR:RXR) heterodimers require the presence of ligand for activation. The heterodimer partner of EcR can influence ligand sensitivity of EcR so that the EcR/Locusta migratoria RXR (EcR:LmRXR) heterodimers are activated at lower concentrations of ligand when compared with the concentrations of ligand required for the activation of EcR/Homo sapiens RXR (EcR:HsRXR) heterodimers. Analysis of chimeric RXRs containing regions of LmRXR and HsRXR and point mutants of HsRXR showed that the amino acid residues present in helix 9 and in the two loops on either end of helix 9 are responsible for improved activity of LmRXR. The EcR:Lm-HsRXR chimera heterodimer induced reporter genes with nanomolar concentration of ligand compared with the micromolar concentration of ligand required for activating the EcR:HsRXR heterodimer. The EcR:Lm-HsRXR chimera heterodimer, but not the EcR:HsRXR heterodimer, supported ligand-dependent induction of reporter gene in a C57BL/6 mouse model.
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Affiliation(s)
- Subba R Palli
- Department of Entomology, University of Kentucky, Lexington, KY 40546, USA.
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Schimanski CC, Schmitz G, Kashyap A, Bosserhoff AK, Bataille F, Schäfer SC, Lehr HA, Berger MR, Galle PR, Strand S, Strand D. Reduced expression of Hugl-1, the human homologue of Drosophila tumour suppressor gene lgl, contributes to progression of colorectal cancer. Oncogene 2005; 24:3100-9. [PMID: 15735678 DOI: 10.1038/sj.onc.1208520] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The human gene, human giant larvae (Hugl-1/Llg1/Lgl1) has significant homology to the Drosophila tumour suppressor gene lethal(2)giant larvae (lgl). The lgl gene codes for a cortical cytoskeleton protein, Lgl, that binds Myosin II and is involved in maintaining cell polarity and epithelial integrity. The human protein, Hugl-1 contains several conserved functional domains found in Lgl, suggesting that these proteins may have closely related functions. Whether loss of Hugl expression plays a role in human tumorigenesis has so far not been extensively investigated. Thus, we evaluated tumour tissues from 94 patients undergoing surgery for colorectal cancer (CRC) for loss of Hugl-1 transcription and compared our findings with the clinical data from each of these patients. We found that Hugl-1 was lost in 75% of tumour samples and these losses were associated with advanced stage and particularly with lymph node metastases. Reduced Hugl-1 expression during the adenoma-carcinoma sequence occurring as early as in colorectal adenomas was detected by both immunohistochemical and reverse transcription-polymerase chain reaction analysis. Functional assays with ecdysone-inducible cell lines revealed that Hugl-1 expression increased cell adhesion and decreased cell migration. Our studies thus indicate that downregulation of Hugl-1 contributes to CRC progression.
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Affiliation(s)
- Carl C Schimanski
- First Department of Internal Medicine, Johannes Gutenberg University, 55101 Mainz, Germany
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Karns LR, Kisielewski A, Gulding KM, Theodorescu D. Manipulation of gene expression by an ecdysone-inducible gene switch in tumor xenografts. BMC Biotechnol 2003; 1:11. [PMID: 11782290 PMCID: PMC64497 DOI: 10.1186/1472-6750-1-11] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2001] [Accepted: 12/18/2001] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Rapid, robust and reversible induction of transgene expression would significantly facilitate cancer gene therapy as well as allow the in vivo functional study of newly discovered genes in tumor formation and progression. The popularity of the ecdysone inducible gene switch system has led us to investigate whether such a system can successfully regulate gene expression in a syngeneic tumor system in vivo. RESULTS MBT-2 and Panc02 carcinoma cells were transfected with components of a modification of the ecdysone switch system driving firefly luciferase (F-Luc). In vitro luciferase expression +/- ecdysone analog GS-E indicated a robust induction with minimal baseline activity and complete decay after 24 hours without drug. In vitro selection of MBT-2 transfected cell clones which had complete absence of F-Luc expression in the absence of stimulation but which expressed this gene at high levels in response to GS-E were chosen for in vivo evaluation. Tumors from engineered MBT-2 cells were grown to 5 mm in diameter prior to GS-E administration, animals euthanized and tumors removed at 6, 12 and 24 hours after GS-E administration and assayed for F-Luc activity. GS-E resulted in a maximal induction of F-Luc activity at 6 hours in tumor tissue with almost complete reversion to control levels by 12 hours. CONCLUSIONS This study is the first demonstration that robust and reversible transgene expression in tumors is feasible using the ecdysone system, allowing future rapid in vivo functional characterization of gene function or gene therapy applications.
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Affiliation(s)
- Larry R Karns
- Upstate Biotechnology Inc., Charlottesville, Virginia
| | - Anne Kisielewski
- RheoGene Inc., Charlottesville, Virginia, USA
- Present address: Upstate Biotechnology Inc., Charlottesville, Virginia, USA
| | - Kathryn M Gulding
- Department of Molecular Physiology and Biological Physics University of Virginia, Charlottesville, Virginia, USA
| | - Dan Theodorescu
- Department of Molecular Physiology and Biological Physics University of Virginia, Charlottesville, Virginia, USA
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Lafont R, Dinan L. Practical uses for ecdysteroids in mammals including humans: an update. JOURNAL OF INSECT SCIENCE (ONLINE) 2003. [PMID: 15844229 DOI: 10.1673/031.003.0701] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Ecdysteroids are widely used as inducers for gene-switch systems based on insect ecdysteroid receptors and genes of interest placed under the control of ecdysteroid-response elements. We review here these systems, which are currently mainly used in vitro with cultured cells in order to analyse the role of a wide array of genes, but which are expected to represent the basis for future gene therapy strategies. Such developments raise several questions, which are addressed in detail. First, the metabolic fate of ecdysteroids in mammals, including humans, is only poorly known, and the rapid catabolism of ecdysteroids may impede their use as in vivo inducers. A second set of questions arose in fact much earlier with the pioneering "heterophylic" studies of Burdette in the early sixties on the pharmacological effects of ecdysteroids on mammals. These and subsequent studies showed a wide range of effects, most of them being beneficial for the organism (e.g. hypoglycaemic, hypocholesterolaemic, anabolic). These effects are reviewed and critically analysed, and some hypotheses are proposed to explain the putative mechanisms involved. All of these pharmacological effects have led to the development of a wide array of ecdysteroid-containing preparations, which are primarily used for their anabolic and/or "adaptogenic" properties on humans (or horses or dogs). In the same way, increasing numbers of patents have been deposited concerning various beneficial effects of ecdysteroids in many medical or cosmetic domains, which make ecdysteroids very attractive candidates for several practical uses. It may be questioned whether all these pharmacological actions are compatible with the development of ecdysteroid-inducible gene switches for gene therapy, and also if ecdysteroids should be classified among doping substances.
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Affiliation(s)
- R Lafont
- Université Pierre et Marie Curie, Institut de Biologie Intégrative, Laboratoire d'Endocrinologie Moléculaire et Evolution, 7 Quai Saint Bernard, Case Courrier No 29, 75252 Paris Cedex 05, France.
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