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Sang L, Liu Z, Huang C, Xu J, Wang H. Multiparametric MRI-based radiomics nomogram for predicting the hormone receptor status of HER2-positive breast cancer. Clin Radiol 2024; 79:60-66. [PMID: 37838543 DOI: 10.1016/j.crad.2023.09.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 07/28/2023] [Accepted: 09/12/2023] [Indexed: 10/16/2023]
Abstract
AIM To investigate the value of multiparametric magnetic resonance imaging (MRI)-based radiomics nomograms for predicting the hormone receptor (HR) status of HER2-positive breast cancer. MATERIALS AND METHODS Patients with HER2-positive invasive breast cancer were divided randomly into training (68 patients) and validation (30 patients) sets. All were classified as either HR-positive (HR+) or negative (HR-) at histopathology. Two radiologists outlined the three-dimensional (3D) volumetric regions of interest (VOI) on the MRI images. Features (n=1,096) were extracted from the T2-weighted imaging (WI), apparent diffusion coefficient (ADC), and dynamic contrast-enhanced (DCE) images separately. Dimensionality was reduced using feature screening. Binary radiomics prediction models were established using a logistic regression classifier and were validated in the validation set. To construct a nomogram, independent predictors were identified using multivariate logistic regression analysis. The predictive efficacy of the model was assessed using the area under the receiver operating characteristic curve (AUC). RESULTS Ten radiomics features were obtained after feature dimensionality reduction based on the merged T2WI, ADC, and DCE images. The diagnostic efficacy of the radiomics signature using the three sequences was better than that of any single sequence (training set AUC: 0.797; validation set AUC: 0.75). Using multivariate logistic regression analysis, the independent predictors for identifying HR status were combined radiomics signature and peritumoural oedema. Nomograms constructed by combining the radiomics signature and peritumoural oedema showed good discrimination in both the training and validation sets (AUC: 0.815 and 0. 805, respectively). CONCLUSION A multiparametric MRI-based nomogram incorporating the radiomics signature and peritumoural oedema can assess the HR status of HER2-positive breast cancer. The resulting model can improve diagnostic accuracy, improving patient outcomes.
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Affiliation(s)
- L Sang
- Department of Radiology, Shandong Provincial Hospital, Affiliated to Shandong First Medical University, No. 324, Jingwu Road, Huaiyin District, Jinan 250012, Shandong, China
| | - Z Liu
- Department of Radiology, Shandong Provincial Hospital, Affiliated to Shandong First Medical University, No. 324, Jingwu Road, Huaiyin District, Jinan 250012, Shandong, China
| | - C Huang
- Department of Research Collaboration, R&D Center, Beijing Deepwise & League of, PHD Technology Co. Ltd, Beijing, China
| | - J Xu
- Department of Research Collaboration, R&D Center, Beijing Deepwise & League of, PHD Technology Co. Ltd, Beijing, China
| | - H Wang
- Department of Radiology, Shandong Provincial Hospital, Affiliated to Shandong First Medical University, No. 324, Jingwu Road, Huaiyin District, Jinan 250012, Shandong, China.
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Li Z, Ma S, Sang L, Qu G, Zhang T, Xu B, Jin W, Zhao Y. Enhanced arsenite removal from water using zirconium-ferrocene MOFs coupled with peroxymonosulfate:oxidation and multi-sites adsorption mechanism. Chemosphere 2023; 319:138044. [PMID: 36736837 DOI: 10.1016/j.chemosphere.2023.138044] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 01/08/2023] [Accepted: 02/01/2023] [Indexed: 06/18/2023]
Abstract
The efficient removal of arsenite (As(III)) poses a significant challenge to traditional water treatment technologies due to its high toxicity and mobility. In this work, multifunctional Zirconium-Ferrocene Metal Organic Framework (ZrFc-MOF) fabricated with redox-active 1,1-ferrocene dicarboxylic acid ligands and Zr4+ precursors were elaborated to achieve remarkably enhanced As(III) removal via activation by peroxymonosulfate (PMS). The adsorption affinity coefficient increased from 0.097 to 2.035 L mg-1 and the maximum adsorption capacity increased from 59.79 to 111.34 mg g-1 compared with that without PMS. Besides the conventional homogeneous PMS oxidation and the following adsorption through Zr-O clusters of ZrFc-MOFs, the enhanced As(III) removal synergistic combines the oxidation mechanism of As(III) by reactive oxygen species (•OH, SO4•-, O2•- and 1O2) formed in Ferrocene (Fc) activating PMS process with the simultaneous formed extra adsorption sites of Ferrocenium (Fc+). PMS also help ZrFc-MOF to avoid destruction in harsh alkaline condition, making the effluent in this advanced treatment meet the World Health Organization (WHO) threshold of 10 μg L-1 over a wide range of initial pH (2-11) with high selectivity and durability. These results indicate that this novel Fc-based MOFs activating PMS system has potential applicability for As(III) in oxidation and selectively capturing in the water environment.
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Affiliation(s)
- Zongchen Li
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area of Ministry of Natural Resources, Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, Institute of Eco-Chongming and School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China; School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Shengjia Ma
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area of Ministry of Natural Resources, Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, Institute of Eco-Chongming and School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China
| | - Linfeng Sang
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area of Ministry of Natural Resources, Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, Institute of Eco-Chongming and School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China
| | - Guojuan Qu
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area of Ministry of Natural Resources, Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, Institute of Eco-Chongming and School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China
| | - Tao Zhang
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area of Ministry of Natural Resources, Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, Institute of Eco-Chongming and School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China
| | - Bin Xu
- School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Wei Jin
- School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Yaping Zhao
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area of Ministry of Natural Resources, Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, Institute of Eco-Chongming and School of Ecological and Environmental Sciences, East China Normal University, Shanghai, 200241, China.
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Sang L, Li YM. [Mechanical ventilation strategy for acute respiratory distress syndrome patients supported by veno-venous extracorporeal membrane oxygenation]. Zhonghua Yi Xue Za Zhi 2022; 102:1895-1898. [PMID: 35768387 DOI: 10.3760/cma.j.cn112137-20220207-00241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The mortality of acute respiratory distress syndrome (ARDS) patients is very high, veno-venous extracorporeal membrane oxygenation (VV-ECMO) has been proved to improve the prognosis of these patients, but the maximization of this benefit relies on the appropriate mechanical ventilation strategy; with the new research evidence arise, scholars have reached a certain consensus on how to implement mechanical ventilation in ARDS patients supported by VV-ECMO, but there are still many controversies. Based on the evidences of current researches and clinical experiences, this article analyzes the hot issues of mechanical ventilation strategy for these patients, including the implementation of early 'overprotective' ventilation strategy, whether spontaneous breathing allowed, prone ventilation and ventilator weaning.
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Affiliation(s)
- L Sang
- Department of Critical Care Medicine, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Institute of Respiratory Health, Guangzhou 510120, China
| | - Y M Li
- Department of Critical Care Medicine, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou Institute of Respiratory Health, Guangzhou 510120, China
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Amaral TF, Grázia JGV, Gonella-Diaza AM, Martinhão LAG, Heredia D, Melo GD, Pohler KG, Estrada-Cortés E, Dikmen S, Sosa F, Jensen LM, Sang L, Siqueira LGB, Viana JHM, Hansen PJ. 84 Actions of DKK1 on the bovine embryo during the morula-to-blastocyst stage of development on pregnancy outcomes and placental hormone secretion after embryo transfer. Reprod Fertil Dev 2021; 34:279. [PMID: 35231213 DOI: 10.1071/rdv34n2ab84] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Affiliation(s)
- T F Amaral
- Department of Animal Sciences, University of Florida, Gainesville, FL, USA
| | - J G V Grázia
- FIVX Apoyar Biotech LTDA, Juiz de Fora, Minas Gerais, Brazil
| | - A M Gonella-Diaza
- Department of Animal Sciences, University of Florida, North Florida Research and Education Center, Marianna, FL, USA
| | - L A G Martinhão
- Biological Science Institute, University of Brasília, Brasília, DF, Brazil
| | - D Heredia
- Department of Animal Sciences, University of Florida, North Florida Research and Education Center, Marianna, FL, USA
| | - G D Melo
- Department of Animal Sciences, Texas A&M University, College Station, TX, USA
| | - K G Pohler
- Department of Animal Sciences, Texas A&M University, College Station, TX, USA
| | - E Estrada-Cortés
- Department of Animal Sciences, University of Florida, Gainesville, FL, USA
| | - S Dikmen
- Department of Animal Science, Faculty of Veterinary Medicine, Bursa Uludag University, Bursa, Turkey
| | - F Sosa
- Department of Animal Sciences, University of Florida, Gainesville, FL, USA
| | - L M Jensen
- Department of Animal Sciences, University of Florida, Gainesville, FL, USA
| | - L Sang
- Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou, China
| | - L G B Siqueira
- Brazilian Agricultural Research Corporation (Embrapa), Juiz de Fora, Minas Gerais, Brazil
| | - J H M Viana
- Brazilian Agricultural Research Corporation (Embrapa), Juiz de Fora, Minas Gerais, Brazil
| | - P J Hansen
- Department of Animal Sciences, University of Florida, Gainesville, FL, USA
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Sang L, Li YM. [The application prospect of electrical impedance tomography in chronic airway disease]. Zhonghua Jie He He Hu Xi Za Zhi 2021; 44:784-786. [PMID: 34496518 DOI: 10.3760/cma.j.cn112147-20210427-00294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
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Wang J, Sun S, Chen Y, Chen D, Sang L, Xie X. Characterization of Staphylococcus aureus ST3320 clone causing fatal respiratory infection in rabbits. World Rabbit Sci 2021. [DOI: 10.4995/wrs.2021.14280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
<em>Staphylococcus aureus</em> is a well-known pathogen that infects humans and animals. However, information on the fatal respiratory infection in rabbits caused by<em> S. aureus</em> is still limited. In the present study, a <em>S. aureus</em> isolate designated ND01 was recovered from lung samples of rabbits that died of fatal respiratory infection, and the ND01 was characterised by intranasal infection of rabbits, multi-locus sequencing typing, screening virulence genes and testing antimicrobial susceptibility. Clinical signs of matted forepaws and pathological lesions of haemorrhagic tracheitis and necrotising haemorrhagic pneumonia were observed in the ND01 infected rabbits, which were identical to those of naturally infected ones. The sequence type of the ND01 was defined as ST3320 and the ND01 was further grouped into the clonal complex 398. Notably, the ND01 was <em>pvl-positive</em> <em>S. aureus</em> and carried the human-associated scn gene. Moreover, the ND01 was methicillin-susceptible <em>S. aureus</em> and was susceptible to 6 of 10 tested antibiotics. This study described the characteristics of the ND01 causing fatal respiratory infection in rabbits. The results are helpful to further the understanding of the pathogenicity of S. aureus ST3320 clone in rabbits. The results also highlighted that operators must be on the alert for the colonisation of <em>pvl-positive</em> <em>S. aureus</em> in rabbits and potential transmission events between rabbits and humans.
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Jiang L, Li LY, Wu AH, Jiang RM, Zheng RQ, Li XY, Sang L, Pan C, Zheng X, Zhong M, Zhang W, Guan XD, Tong ZH, Du B, Qiu HB. [2019 novel coronavirus: appropriate rather than undue protection]. Zhonghua Nei Ke Za Zhi 2020; 59:662-664. [PMID: 32838496 DOI: 10.3760/cma.j.cn112138-20200303-00172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- L Jiang
- Department of Critical Care Medicine, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - L Y Li
- Department of Healthcare-Associated Infection Management and Disease Prevention and Control, Peking University First Hospital, Beijing 100034, China
| | - A H Wu
- Center of Healthcare-associated Infection Control, Xiangya Hospital, Central South University, Changsha 410008, China
| | - R M Jiang
- Second Department of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing 100015, China
| | - R Q Zheng
- Department of Critical Care Medicine, Northern Jiangsu People's Hospital, Yangzhou 225001, China
| | - X Y Li
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - L Sang
- Department of Critical Care Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Institute of Respiratory Health, Guangzhou 510120, China
| | - C Pan
- Department of Critical Care Medicine, Zhongda Hospital, Southeast University, Nanjing 210009, China
| | - X Zheng
- Department of Critical Care Medicine, The First Affiliated Hospital of Zhejiang University, Hangzhou 310003, China
| | - M Zhong
- Department of Critical Care Medicine, Zhongshan Hospital Fudan University, Shanghai 200032, China
| | - W Zhang
- Department of Emergency, the 900th Hospital of Joint Service Corps of Chinese PLA, Fuzhou 350025, China
| | - X D Guan
- Department of Critical Care Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Z H Tong
- Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - B Du
- Department of Medical Intensive Care Unit, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - H B Qiu
- Department of Critical Care Medicine, Zhongda Hospital, Southeast University, Nanjing 210009, China
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Zhu M, Xu Y, Sang L, Zhao Z, Wang L, Wu X, Fan F, Wang Y, Li H. An ICT-based fluorescent probe with a large Stokes shift for measuring hydrazine in biological and water samples. Environ Pollut 2020; 256:113427. [PMID: 31672354 DOI: 10.1016/j.envpol.2019.113427] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/20/2019] [Accepted: 10/16/2019] [Indexed: 06/10/2023]
Abstract
As a strong reductant and highly active alkali, hydrazine (N2H4) has been widely used in chemical industry, pharmaceutical manufacturing and agricultural production. However, its high acute toxicity poses a threat to ecosystem and human health. In the present study, a ratiometric fluorescent probe for the detection of N2H4 was designed, utilizing dicyanoisophorone as the fluorescent group and 4-bromobutyryl moiety as the recognition site. 4-(2-(3-(dicyanomethylene)-5,5-dimethylcyclohex-1-enyl) phenyl 4-brobutanoate (DDPB) was readily synthesized and could specially sense N2H4 via an intramolecular charge transfer (ICT) pathway. The cyclization cleavage reaction of N2H4 with a 4-bromobutyryl group released phenolic hydroxyl group and reversed the ICT process between hydroxy group and fluorophore, turning on the fluorescence in the DDPB-N2H4 complexes. DDPB exhibits a low cytotoxicity, reasonable cell permeability, a large Stokes shift (186 nm) and a low detection limit (86.3 nM). The quantitative determination of environmental water systems and the visualization fluorescence of DDPB test strips provides a strong evidence for the applications of DDPB. In addition, DDPB is suitable for the fluorescence imaging of exogenous N2H4 in HeLa cells and zebrafish.
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Affiliation(s)
- Meiqing Zhu
- Key Laboratory of Agri-food Safety of Anhui Province, School of Resources and Environment, Anhui Agricultural University, No. 130 Changjiang West Road, Hefei, 230036, China
| | - Yimin Xu
- Key Laboratory of Agri-food Safety of Anhui Province, School of Resources and Environment, Anhui Agricultural University, No. 130 Changjiang West Road, Hefei, 230036, China
| | - Linfeng Sang
- Key Laboratory of Agri-food Safety of Anhui Province, School of Resources and Environment, Anhui Agricultural University, No. 130 Changjiang West Road, Hefei, 230036, China
| | - Zongyuan Zhao
- Key Laboratory of Agri-food Safety of Anhui Province, School of Resources and Environment, Anhui Agricultural University, No. 130 Changjiang West Road, Hefei, 230036, China
| | - Lijun Wang
- Key Laboratory of Agri-food Safety of Anhui Province, School of Resources and Environment, Anhui Agricultural University, No. 130 Changjiang West Road, Hefei, 230036, China
| | - Xiaoqin Wu
- Key Laboratory of Agri-food Safety of Anhui Province, School of Resources and Environment, Anhui Agricultural University, No. 130 Changjiang West Road, Hefei, 230036, China
| | - Fugang Fan
- Key Laboratory of Agri-food Safety of Anhui Province, School of Resources and Environment, Anhui Agricultural University, No. 130 Changjiang West Road, Hefei, 230036, China
| | - Yi Wang
- Key Laboratory of Agri-food Safety of Anhui Province, School of Resources and Environment, Anhui Agricultural University, No. 130 Changjiang West Road, Hefei, 230036, China.
| | - Hui Li
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, USA
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Zhu M, Wu X, Sang L, Fan F, Wang L, Wu X, Hua R, Wang Y, Li QX. A novel and effective benzo[d]thiazole-based fluorescent probe with dual recognition factors for highly sensitive and selective imaging of cysteine in vitro and in vivo. NEW J CHEM 2019. [DOI: 10.1039/c9nj03202a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Double recognition groups significantly improved the selectivity of a fluorescent probe to Cys in living cells.
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Affiliation(s)
- Meiqing Zhu
- Key Laboratory of Agri-food Safety of Anhui Province
- School of Resources and Environment
- Anhui Agricultural University
- Hefei 230036
- China
| | - Xiaoqin Wu
- Key Laboratory of Agri-food Safety of Anhui Province
- School of Resources and Environment
- Anhui Agricultural University
- Hefei 230036
- China
| | - Linfeng Sang
- Key Laboratory of Agri-food Safety of Anhui Province
- School of Resources and Environment
- Anhui Agricultural University
- Hefei 230036
- China
| | - Fugang Fan
- Key Laboratory of Agri-food Safety of Anhui Province
- School of Resources and Environment
- Anhui Agricultural University
- Hefei 230036
- China
| | - Lijun Wang
- Key Laboratory of Agri-food Safety of Anhui Province
- School of Resources and Environment
- Anhui Agricultural University
- Hefei 230036
- China
| | - Xiangwei Wu
- Key Laboratory of Agri-food Safety of Anhui Province
- School of Resources and Environment
- Anhui Agricultural University
- Hefei 230036
- China
| | - Rimao Hua
- Key Laboratory of Agri-food Safety of Anhui Province
- School of Resources and Environment
- Anhui Agricultural University
- Hefei 230036
- China
| | - Yi Wang
- Key Laboratory of Agri-food Safety of Anhui Province
- School of Resources and Environment
- Anhui Agricultural University
- Hefei 230036
- China
| | - Qing X. Li
- Department of Molecular Biosciences and Bioengineering
- University of Hawaii at Manoa
- Honolulu
- USA
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Sang L, Yang W, Han L, Liang A, Hua G, Xiong J, Huo L, Yang L. An immunological method to screen sex-specific proteins of bovine sperm. J Dairy Sci 2011; 94:2060-70. [DOI: 10.3168/jds.2010-3350] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2010] [Accepted: 12/14/2010] [Indexed: 12/15/2022]
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Guo X, Jia Z, Zhang P, Yang S, Wu W, Sang L, Luo Y, Lu X, Dai H, Zeng Z, Wang W. Impact of mode of transportation on dyslipidaemia in working people in Beijing. Br J Sports Med 2009; 43:928-31. [DOI: 10.1136/bjsm.2008.049171] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Feng X, Qiu G, Wang S, Sang L. Distribution and speciation of mercury in surface waters in mercury mining areas in Wanshan, Southwestern China. ACTA ACUST UNITED AC 2003. [DOI: 10.1051/jp4:20030339] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Wu L, Timmers C, Maiti B, Saavedra HI, Sang L, Chong GT, Nuckolls F, Giangrande P, Wright FA, Field SJ, Greenberg ME, Orkin S, Nevins JR, Robinson ML, Leone G. The E2F1-3 transcription factors are essential for cellular proliferation. Nature 2001; 414:457-62. [PMID: 11719808 DOI: 10.1038/35106593] [Citation(s) in RCA: 482] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The retinoblastoma tumour suppressor (Rb) pathway is believed to have a critical role in the control of cellular proliferation by regulating E2F activities. E2F1, E2F2 and E2F3 belong to a subclass of E2F factors thought to act as transcriptional activators important for progression through the G1/S transition. Here we show, by taking a conditional gene targeting approach, that the combined loss of these three E2F factors severely affects E2F target expression and completely abolishes the ability of mouse embryonic fibroblasts to enter S phase, progress through mitosis and proliferate. Loss of E2F function results in an elevation of p21Cip1 protein, leading to a decrease in cyclin-dependent kinase activity and Rb phosphorylation. These findings suggest a function for this subclass of E2F transcriptional activators in a positive feedback loop, through down-modulation of p21Cip1, that leads to the inactivation of Rb-dependent repression and S phase entry. By targeting the entire subclass of E2F transcriptional activators we provide direct genetic evidence for their essential role in cell cycle progression, proliferation and development.
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Affiliation(s)
- L Wu
- Division of Human Cancer Genetics, Department of Molecular Virology, Immunology and Medical Genetics, and Department of Molecular Genetics, The Ohio State University, Columbus, Ohio 43210, USA
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Abstract
Aberrant expression of developmentally silenced genes, characteristic of tumor cells and regenerating tissue, is highly correlated with increased cell proliferation. By modeling this process in vitro in synthetic nuclei, we find that DNA replication leads to deregulation of established developmental expression patterns. Chromatin assembly in the presence of adult mouse liver nuclear extract mediates developmental stage-specific silencing of the tumor marker gene alpha-fetoprotein (AFP). Replication of silenced AFP chromatin in synthetic nuclei depletes sequence-specific transcription repressors, thereby disrupting developmentally regulated repression. Hepatoma-derived factors can target partial derepression of AFP, but full transcription activation requires DNA replication. Thus, unscheduled entry into S phase directly mediates activation of a developmentally silenced gene by (i) depleting developmental stage-specific transcription repressors and (ii) facilitating binding of transactivators.
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Affiliation(s)
- A J Crowe
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, Ohio 45267-0524, USA
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Crowe AJ, Sang L, Li KK, Lee KC, Spear BT, Barton MC. Hepatocyte nuclear factor 3 relieves chromatin-mediated repression of the alpha-fetoprotein gene. J Biol Chem 1999; 274:25113-20. [PMID: 10455192 DOI: 10.1074/jbc.274.35.25113] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The alpha-fetoprotein gene (AFP) is tightly regulated at the tissue-specific level, with expression confined to endoderm-derived cells. We have reconstituted AFP transcription on chromatin-assembled DNA templates in vitro. Our studies show that chromatin assembly is essential for hepatic-specific expression of the AFP gene. While nucleosome-free AFP DNA is robustly transcribed in vitro by both cervical (HeLa) and hepatocellular (HepG2) carcinoma extracts, the general transcription factors and transactivators present in HeLa extract cannot relieve chromatin-mediated repression of AFP. In contrast, preincubation with either HepG2 extract or HeLa extract supplemented with recombinant hepatocyte nuclear factor 3 alpha (HNF3alpha), a hepatic-enriched factor expressed very early during liver development, is sufficient to confer transcriptional activation on a chromatin-repressed AFP template. Transient transfection studies illustrate that HNF3alpha can activate AFP expression in a non-liver cellular environment, confirming a pivotal role for HNF3alpha in establishing hepatic-specific gene expression. Restriction enzyme accessibility assays reveal that HNF3alpha promotes the assembly of an open chromatin structure at the AFP promoter. Combined, these functional and structural data suggest that chromatin assembly establishes a barrier to block inappropriate expression of AFP in non-hepatic tissues and that tissue-specific factors, such as HNF3alpha, are required to alleviate the chromatin-mediated repression.
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Affiliation(s)
- A J Crowe
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, Ohio 45267-0524, USA
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