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Mei W, Mei B, Chang J, Liu Y, Zhou Y, Zhu N, Hu M. Role and regulation of FOXO3a: new insights into breast cancer therapy. Front Pharmacol 2024; 15:1346745. [PMID: 38505423 PMCID: PMC10949727 DOI: 10.3389/fphar.2024.1346745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Accepted: 02/16/2024] [Indexed: 03/21/2024] Open
Abstract
Breast cancer is the most common malignancy in the world, particularly affecting female cancer patients. Enhancing the therapeutic strategies for breast cancer necessitates identifying molecular drug targets that effectively eliminate tumor cells. One of these prominent targets is the forkhead and O3a class (FOXO3a), a member of the forkhead transcription factor subfamily. FOXO3a plays a pivotal role in various cellular processes, including apoptosis, proliferation, cell cycle regulation, and drug resistance. It acts as a tumor suppressor in multiple cancer types, although its specific role in cancer remains unclear. Moreover, FOXO3a shows promise as a potential marker for tumor diagnosis and prognosis in breast cancer patients. In addition, it is actively influenced by common anti-breast cancer drugs like paclitaxel, simvastatin, and gefitinib. In breast cancer, the regulation of FOXO3a involves intricate networks, encompassing post-translational modification post-translational regulation by non-coding RNA (ncRNA) and protein-protein interaction. The specific mechanism of FOXO3a in breast cancer urgently requires further investigation. This review aims to systematically elucidate the role of FOXO3a in breast cancer. Additionally, it reviews the interaction of FOXO3a and its upstream and downstream signaling pathway-related molecules to uncover potential therapeutic drugs and related regulatory factors for breast cancer treatment by regulating FOXO3a.
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Affiliation(s)
- Wenqiu Mei
- Key Laboratory of Environmental Related Diseases and One Health, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
- Department of Neurology, Ezhou Central Hospital, Ezhou, China
| | - Bingyin Mei
- Department of Neurology, Ezhou Central Hospital, Ezhou, China
| | - Jing Chang
- Key Laboratory of Environmental Related Diseases and One Health, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Yifei Liu
- School of Biomedical Engineering, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Yanhong Zhou
- Department of Medical School of Facial Features, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Ni Zhu
- Key Laboratory of Environmental Related Diseases and One Health, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
| | - Meichun Hu
- Key Laboratory of Environmental Related Diseases and One Health, School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xianning, China
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Li J, Mei B, Mei H, He S, Zhu Y, Huang J, Wang D, Zhang G. 186P Degradation of BRCA2 expression by hyperthermia sensitizes HRD-negative (BRCA2 wild-type) ovarian cancer cells to niraparib. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.10.222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
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Wang Y, Wu W, Cheng Z, Tan X, Yang Z, Zeng X, Mei B, Ni Z, Wang X. Super-factors associated with transmission of occupational COVID-19 infection among healthcare staff in Wuhan, China. J Hosp Infect 2020; 106:25-34. [PMID: 32574702 PMCID: PMC7836737 DOI: 10.1016/j.jhin.2020.06.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 06/17/2020] [Indexed: 12/18/2022]
Abstract
BACKGROUND Globally, there have been many cases of coronavirus disease 2019 (COVID-19) among medical staff; however, the main factors associated with the infection are not well understood. AIM To identify the super-factors causing COVID-19 infection in medical staff in China. METHODS A cross-sectional study was conducted between January 1st and February 30th, 2020, in which front-line members of medical staff who took part in the care and treatment of patients with COVID-19 were enrolled. Epidemiological and demographic data between infected and uninfected groups were collected and compared. Social network analysis (SNA) was used to establish socio-metric social links between influencing factors. FINDINGS A total of 92 medical staff were enrolled. In all participant groups, the super-factor identified by the network was wearing a medical protective mask or surgical mask correctly (degree: 572; closeness: 25; betweenness centrality: 3.23). Touching the cheek, nose, and mouth while working was the super-factor in the infected group. This was the biggest node in the network and had the strongest influence (degree: 370; closeness: 29; betweenness centrality: 0.37). Self-protection score was the super-factor in the uninfected group but was the isolated factor in the infected group (degree: 201; closeness: 28; betweenness centrality: 5.64). For family members, the exposure history to Huanan Seafood Wholesale Market and the contact history to wild animals were two isolated nodes. CONCLUSION High self-protection score was the main factor that prevented medical staff from contracting COVID-19 infection. The main factor contributing to COVID-19 infections among medical staff was touching the cheek, nose, and mouth while working.
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Affiliation(s)
- Y Wang
- Department of Infection Management, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - W Wu
- School of Public Health and Management, Hubei University of Medicine, Shiyan, China; School of Health Science, Wuhan University, Wuhan, China
| | - Z Cheng
- Department of Respiratory and Critical Care Medicine, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - X Tan
- School of Health Science, Wuhan University, Wuhan, China
| | - Z Yang
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - X Zeng
- Center for Evidence-Based and Translational Medicine, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - B Mei
- Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Z Ni
- School of Medicine, Hangzhou Normal University, Hangzhou, China
| | - X Wang
- Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan, China; Center for Evidence-Based and Translational Medicine, Zhongnan Hospital of Wuhan University, Wuhan, China.
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Xie ZY, Gong XX, Xu XD, Mei B, Xuan XZ, Long H, Zhang X, Cai XN. Identification of Vibrio alginolyticus virulent strain-specific DNA regions by suppression subtractive hybridization and PCR. J Appl Microbiol 2020; 129:1472-1485. [PMID: 32510751 DOI: 10.1111/jam.14739] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 05/23/2020] [Accepted: 06/02/2020] [Indexed: 12/25/2022]
Abstract
AIMS Vibrio alginolyticus was frequently isolated from diseased farmed fish in the coaster waters of Hainan Island over the past two decades. In this study, we attempted to identify candidates of virulent strain-specific DNA regions for this pathogen. METHODS AND RESULTS Suppression subtractive hybridization (SSH) and PCR were successively performed between the typical virulent strain and avirulent strain of V. alginolyticus, in which they shared 99·54% homology of 16S rDNAs. Out of 2873 subtracted clones, nine clones were finally indicated to harbour virulent strain-specific DNA fragments. The receivable functions of the major fragments in the nine clones were believed to encode methyl-accepting chemotaxis protein (n = 1), type VI secretion system-associated FHA domain protein TagH (n = 1), diguanylate cyclase (n = 1), AraC family transcriptional regulator (n = 1), ABC-type uncharacterized transport system permease component (n = 1) and hypothetical proteins (n = 4). Two hypothetical proteins contain several disordered regions. CONCLUSIONS Some specific DNA regions existed in the virulent strain of V. alginolyticus, and the SSH assay could be a highly sensitive method for identifying virulent regions in pathogens. SIGNIFICANCE AND IMPACT OF THE STUDY This report is the first to describe the identification of virulent strain-specific DNA regions in the V. alginolyticus genome, which is helpful in developing virulent strain-specific rapid detection methods and is a pivotal precondition for clarifying the molecular virulence mechanism of V. alginolyticus.
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Affiliation(s)
- Z-Y Xie
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, China.,Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, China.,College of Marine Sciences, Hainan University, Haikou, Hainan Province, China
| | - X-X Gong
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, China.,Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, China.,College of Marine Sciences, Hainan University, Haikou, Hainan Province, China
| | - X-D Xu
- College of Marine Sciences, Hainan University, Haikou, Hainan Province, China
| | - B Mei
- College of Marine Sciences, Hainan University, Haikou, Hainan Province, China
| | - X-Z Xuan
- College of Marine Sciences, Hainan University, Haikou, Hainan Province, China
| | - H Long
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, China
| | - X Zhang
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, China.,Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, China.,College of Marine Sciences, Hainan University, Haikou, Hainan Province, China
| | - X-N Cai
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, China.,Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, China.,College of Marine Sciences, Hainan University, Haikou, Hainan Province, China
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Mei B, Liu H, Yang S, Liang MY, Yue Y, Huang SQ, Hou J, Chen GX, Wu ZK. Long non-coding RNA expression profile in permanent atrial fibrillation patients with rheumatic heart disease. Eur Rev Med Pharmacol Sci 2019; 22:6940-6947. [PMID: 30402860 DOI: 10.26355/eurrev_201810_16165] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Atrial fibrillation (AF) is the most common type of arrhythmia, especially in rheumatic heart disease (RHD) patients. The differences in structural remodeling and electrical remodeling between the left and right atrium associated with AF in RHD patients are well known, and alterations in the expression profiles of long noncoding RNAs (lncRNAs) in the left atrium have also been investigated. However, the role of lncRNAs in the right atrium (RA) remains largely unknown. PATIENTS AND METHODS We identified differentially expressed lncRNAs in RA tissues of RHD patients with AF or a normal sinus rhythm (NSR) using microarray analysis. Then, we performed gene ontology (GO) and KEGG pathway analyses for functional annotation of the deregulated lncRNAs. Finally, we constructed a lncRNA-mRNA co-expression network. RESULTS Of the 22,829 human non-coding RNAs analyzed, a total of 1,909 long non-coding RNAs were detected. A total of 182 lncRNAs (117 downregulated and 65 upregulated) were shown to be differentially expressed (fold-change > 1.5) in AF patients compared with NSR patients. Many lncRNAs might be partially involved in an AF-related pathway. CONCLUSIONS AF dysregulates the expression of lncRNAs in the RA of RHD patients. These findings may be useful for exploring potential therapeutic treatments for AF in RHD patients.
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Affiliation(s)
- B Mei
- Department of Cardiac Surgery, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China.
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Scarpitta R, Zanna I, Aretini P, Gambino G, Scatena C, Mei B, Ghilli M, Rossetti E, Roncella M, Congregati C, Bonci F, Naccarato AG, Palli D, Caligo MA. Germline investigation in male breast cancer of DNA repair genes by next-generation sequencing. Breast Cancer Res Treat 2019; 178:557-564. [PMID: 31512090 DOI: 10.1007/s10549-019-05429-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 08/29/2019] [Indexed: 02/03/2023]
Abstract
PURPOSE In order to better define the breast cancer (BC) genetic risk factors in men, a germline investigation was carried out on 81 Male BC cases by screening the 24 genes involved in BC predisposition, genome stability maintenance and DNA repair mechanisms by next-generation sequencing. METHODS Germline DNAs were tested in a custom multi-gene panel focused on all coding exons and exon-intron boundaries of 24 selected genes using two amplicon-based assays on PGM-Ion Torrent (ThermoFisher Scientific) and MiSeq (Illumina) platforms. All variants were recorded and classified by using a custom pipeline. RESULTS Clinical pathological data and the family history of 81 Male BC cases were gathered and analysed, revealing the average age of onset to be 61.3 years old and that in 35 cases there was a family history of BC. Our genetic screening allowed us to identify a germline mutation in 22 patients (23%) in 4 genes: BRCA2, BRIP1, MUTYH and PMS2. Moreover, 12 variants of unknown clinical significance (VUS) in 9 genes (BARD1, BRCA1, BRIP1, CHEK2, ERCC1, NBN, PALB2, PMS1, RAD50) were predicted as potentially pathogenic by in silico analysis bringing the mutation detection rate up to 40%. CONCLUSION As expected, a positive family history is a strong predictor of germline BRCA2 mutations in male BC. Understanding the potential pathogenicity of VUS represents an extremely urgent need for the management of BC risk in Male BC cases and their own families.
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Affiliation(s)
- R Scarpitta
- Section of Genetic Oncology, University Hospital, Pisa, Italy
| | - I Zanna
- Cancer Risk Factors and Lifestyle Epidemiology Unit, Institute for Cancer Research, Prevention and Clinical Network (ISPRO), Via Delle Oblate 4, 50141, Florence, Italy
| | - P Aretini
- Section of Cancer Genomics, Fondazione Pisana per la Scienza, Pisa, Italy
| | - G Gambino
- Section of Genetic Oncology, University Hospital, Pisa, Italy
| | - C Scatena
- Division of Pathology, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - B Mei
- Section of Genetic Oncology, University Hospital, Pisa, Italy
| | - M Ghilli
- Breast Cancer Center, University Hospital, Pisa, Italy
| | - E Rossetti
- Breast Cancer Center, University Hospital, Pisa, Italy
| | - M Roncella
- Breast Cancer Center, University Hospital, Pisa, Italy
| | - C Congregati
- Division of Internal Medicine, University Hospital, Pisa, Italy
| | - F Bonci
- Unit of Medical Oncology 2, University Hospital, Pisa, Italy
| | - A G Naccarato
- Division of Pathology, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - D Palli
- Cancer Risk Factors and Lifestyle Epidemiology Unit, Institute for Cancer Research, Prevention and Clinical Network (ISPRO), Via Delle Oblate 4, 50141, Florence, Italy
| | - M A Caligo
- Section of Genetic Oncology, University Hospital, Pisa, Italy.
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Cheng X, Mei B, Zuo Y, Wu H, Peng X, Zhao Q, Liu X, Gu E. Retracted:
A multicentre randomised controlled trial of the effect of intra‐operative dexmedetomidine on cognitive decline after surgery. Anaesthesia 2019; 74:741-750. [PMID: 30835822 DOI: 10.1111/anae.14606] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2019] [Indexed: 12/21/2022]
Affiliation(s)
- X.‐Q. Cheng
- Department of Anaesthesiology First Affiliated Hospital of Anhui Medical University HefeiChina
| | - B. Mei
- Department of Anaesthesiology First Affiliated Hospital of Anhui Medical University HefeiChina
| | - Y.‐M. Zuo
- Department of Anaesthesiology First Affiliated Hospital of Anhui Medical University HefeiChina
| | - H. Wu
- Department of Anaesthesiology First Affiliated Hospital of Anhui Medical University HefeiChina
| | - X.‐H. Peng
- Department of Anaesthesiology First Affiliated Hospital of Anhui Medical University HefeiChina
| | - Q. Zhao
- Department of Anaesthesiology First Affiliated Hospital of Anhui Medical University HefeiChina
| | - X.‐S. Liu
- Department of Anaesthesiology First Affiliated Hospital of Anhui Medical University Hefei China
| | - E. Gu
- Department of Anaesthesiology First Affiliated Hospital of Anhui Medical University Hefei China
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Wyrwich KW, Krishnan S, Auguste P, Poon JL, von Maltzahn R, Yu R, Pierce GF, Mei B, Mahlangu J, von Mackensen S. Changes in health-related quality of life with treatment of longer-acting clotting factors: results in the A-LONG and B-LONG clinical studies. Haemophilia 2016; 22:866-872. [DOI: 10.1111/hae.12987] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/22/2016] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | | | - B. Mei
- Biogen, Inc.; Cambridge MA USA
| | - J. Mahlangu
- Adult Hemophilia Comprehensive Care Unit at University of the Witwatersrand; Faculty of Health Sciences Charlotte Maxeke Johannesburg Hospital; Johannesburg South Africa
| | - S. von Mackensen
- Institute of Medical Psychology; University Medical Centre Hamburg-Eppendorf; Hamburg Germany
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McCue J, Osborne D, Dumont J, Peters R, Mei B, Pierce GF, Kobayashi K, Euwart D. Validation of the manufacturing process used to produce long-acting recombinant factor IX Fc fusion protein. Haemophilia 2014; 20:e327-35. [PMID: 24811361 PMCID: PMC4282370 DOI: 10.1111/hae.12451] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/27/2014] [Indexed: 11/28/2022]
Abstract
Recombinant factor IX Fc (rFIXFc) fusion protein is the first of a new class of bioengineered long-acting factors approved for the treatment and prevention of bleeding episodes in haemophilia B. The aim of this work was to describe the manufacturing process for rFIXFc, to assess product quality and to evaluate the capacity of the process to remove impurities and viruses. This manufacturing process utilized a transferable and scalable platform approach established for therapeutic antibody manufacturing and adapted for production of the rFIXFc molecule. rFIXFc was produced using a process free of human- and animal-derived raw materials and a host cell line derived from human embryonic kidney (HEK) 293H cells. The process employed multi-step purification and viral clearance processing, including use of a protein A affinity capture chromatography step, which binds to the Fc portion of the rFIXFc molecule with high affinity and specificity, and a 15 nm pore size virus removal nanofilter. Process validation studies were performed to evaluate identity, purity, activity and safety. The manufacturing process produced rFIXFc with consistent product quality and high purity. Impurity clearance validation studies demonstrated robust and reproducible removal of process-related impurities and adventitious viruses. The rFIXFc manufacturing process produces a highly pure product, free of non-human glycan structures. Validation studies demonstrate that this product is produced with consistent quality and purity. In addition, the scalability and transferability of this process are key attributes to ensure consistent and continuous supply of rFIXFc.
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Affiliation(s)
- J McCue
- Biogen IdecCambridge, MA, USA
| | | | | | | | - B Mei
- Biogen IdecCambridge, MA, USA
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Dong Z, Yan L, Huang G, Zhang L, Mei B, Meng B. Ibuprofen partially attenuates neurodegenerative symptoms in presenilin conditional double-knockout mice. Neuroscience 2014; 270:58-68. [PMID: 24699228 DOI: 10.1016/j.neuroscience.2014.03.048] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2013] [Revised: 03/06/2014] [Accepted: 03/23/2014] [Indexed: 01/22/2023]
Abstract
Ibuprofen is a widely used nonsteroidal anti-inflammatory drug that reportedly reduces the risk of Alzheimer's disease (AD) development. The anti-inflammatory effect of ibuprofen occurred via inhibition of cyclooxygenases and anti-amyloidogenesis through modulation of γ-secretase. Presenilin 1 and 2 conditional double-knockout (cDKO) mice exhibited age-dependent memory impairment and forebrain degeneration without elevation of amyloid β deposition. Therefore, cDKO mice can be an ideal animal model on which to independently test the effects of ibuprofen anti-inflammatory properties on the prevention of AD. Three- and six-month-old cDKO mice were fed diet containing 375 ppm ibuprofen for six months. After multiple, well-validated behavioral tests, treatment with ibuprofen improved cognition-related behavioral performance, and drug efficacy was correlated with the timing of administration. Ibuprofen was more effective on six-month-old than on three-month-old cDKO mice. Biochemical analysis demonstrated that the effects of ibuprofen on glial fibrillary acidic protein and CD68 expression levels were uneven in different brain regions of cDKO mice and that age also influenced such effects. Tau hyperphosphorylation and the cleavage of caspase-3 decreased after ibuprofen treatment, and this effect was more significant in the older than the younger group of mice, which was consistent with the results of behavioral tests.
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Affiliation(s)
- Z Dong
- Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, East China Normal University, Shanghai 200062, China
| | - L Yan
- Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, East China Normal University, Shanghai 200062, China
| | - G Huang
- Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, East China Normal University, Shanghai 200062, China
| | - L Zhang
- Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, East China Normal University, Shanghai 200062, China
| | - B Mei
- Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, East China Normal University, Shanghai 200062, China
| | - B Meng
- Key Laboratory of Brain Functional Genomics, Ministry of Education, Shanghai Key Laboratory of Brain Functional Genomics, East China Normal University, Shanghai 200062, China.
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Murphy J, Pan C, Barnett T, Mei B, Strauss J, Tjandra H, Tang L, Esmon P, Newgren J, Landskroner K, Parmathi M, Severs J, Teare J, Jiang H, Devens B, Pierce G, Konstantinov K, Fournel M. SITE-SPECIFIC PEGYLATION OF RFVIII RESULTS IN PROLONGED IN VIVO EFFICACY. J Thromb Haemost 2014. [DOI: 10.1111/j.1538-7836.2007.tb01780.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Xu HZ, Wang MT, Mei B, Wang JL, He J. Comparative gene expression profiling reveals key pathways in septic skeletal muscle. Eur Rev Med Pharmacol Sci 2013; 17:2867-2873. [PMID: 24254554] [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: 06/02/2023]
Abstract
AIM Skeletal muscle transcriptome of patients with sepsis was compared with that of controls to elucidate the molecular mechanisms underlying sepsis-induced skeletal muscle dysfunction. MATERIALS AND METHODS Gene expression data set GSE13205 was downloaded from Gene Expression Omnibus (GEO), including 13 septic samples and 8 controls. Differentially expressed genes (DEGs) were screened out with t-test. Transcriptional regulatory network was constructed for the DEGs with information from UCSU. In order to identify altered biological functions in sepsis, pathway enrichment analysis was conducted for all the genes in the network with DAVID. Besides, relevant small molecules were retrieved using the Connectivity Map (camp). RESULTS A total of 287 DEGs were obtained in sepsis, 149 up-regulated and 138 down-regulated. A transcriptional regulatory network containing 83 nodes and 98 edges was then constructed. Five transcription factors (TFs) and their target genes were acquired. Significantly altered biological pathways included insulin signaling pathway, neurotrophin signaling pathway, fructose and mannose metabolism, circadian rhythm and apoptosis. Besides, a number of relevant molecules were obtained, such as trazodone and thapsigargin. CONCLUSIONS Our study provided an insight into the molecular changes sepsis and related skeletal muscle dysfunction. The information could be beneficial in disclosing the pathogenesis and developing effective therapies.
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Affiliation(s)
- H-Z Xu
- Department of Emergency, Changhai Hospital, Second Military Medical University, Shanghai, China.
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Zhang YH, Xu HS, Litvinov YA, Tu XL, Yan XL, Typel S, Blaum K, Wang M, Zhou XH, Sun Y, Brown BA, Yuan YJ, Xia JW, Yang JC, Audi G, Chen XC, Jia GB, Hu ZG, Ma XW, Mao RS, Mei B, Shuai P, Sun ZY, Wang ST, Xiao GQ, Xu X, Yamaguchi T, Yamaguchi Y, Zang YD, Zhao HW, Zhao TC, Zhang W, Zhan WL. Mass measurements of the neutron-deficient 41Ti, 45Cr, 49Fe, and 53Ni nuclides: first test of the isobaric multiplet mass equation in f p-shell nuclei. Phys Rev Lett 2012; 109:102501. [PMID: 23005283 DOI: 10.1103/physrevlett.109.102501] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Indexed: 06/01/2023]
Abstract
Isochronous mass spectrometry has been applied to neutron-deficient 58Ni projectile fragments at the HIRFL-CSR facility in Lanzhou, China. Masses of a series of short-lived T(z)=-3/2 nuclides including 41Ti, 45Cr, 49Fe, and 53Ni have been measured with a precision of 20-40 keV. The new data enable us to test for the first time the isobaric multiplet mass equation (IMME) in fp-shell nuclei. We observe that the IMME is inconsistent with the generally accepted quadratic form for the A=53, T=3/2 quartet. We perform full space shell model calculations and compare them with the new experimental results.
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Affiliation(s)
- Y H Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
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Luo QZ, Lin L, Gong Z, Mei B, Xu YJ, Huo Z, Yu P. Positive association of major histocompatibility complex class I chain-related gene A polymorphism with leukemia susceptibility in the people of Han nationality of Southern China. ACTA ACUST UNITED AC 2011; 78:178-84. [DOI: 10.1111/j.1399-0039.2011.01748.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Han W, Ji T, Wang L, Yan L, Mei B, Su J. O73. Abnormalities in periodontal and salivary tissues in conditional presenilin 1 and presenilin 2 conditional double knockout mice. Oral Oncol 2011. [DOI: 10.1016/j.oraloncology.2011.06.184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tu XL, Xu HS, Wang M, Zhang YH, Litvinov YA, Sun Y, Schatz H, Zhou XH, Yuan YJ, Xia JW, Audi G, Blaum K, Du CM, Geng P, Hu ZG, Huang WX, Jin SL, Liu LX, Liu Y, Ma X, Mao RS, Mei B, Shuai P, Sun ZY, Suzuki H, Tang SW, Wang JS, Wang ST, Xiao GQ, Xu X, Yamaguchi T, Yamaguchi Y, Yan XL, Yang JC, Ye RP, Zang YD, Zhao HW, Zhao TC, Zhang XY, Zhan WL. Direct mass measurements of short-lived A=2Z-1 nuclides (63)Ge, (65)As, (67)Se, and (71)Kr and their impact on nucleosynthesis in the rp process. Phys Rev Lett 2011; 106:112501. [PMID: 21469858 DOI: 10.1103/physrevlett.106.112501] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2011] [Indexed: 05/30/2023]
Abstract
Mass excesses of short-lived A=2Z-1 nuclei (63)Ge, (65)As, (67)Se, and (71)Kr have been directly measured to be -46,921(37), -46,937(85), -46,580(67), and -46,320(141) keV, respectively. The deduced proton separation energy of -90(85) keV for (65)As shows that this nucleus is only slightly proton unbound. X-ray burst model calculations with the new mass excess of (65)As suggest that the majority of the reaction flow passes through (64)Ge via proton capture, indicating that (64)Ge is not a significant rp-process waiting point.
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Affiliation(s)
- X L Tu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
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18
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Strong LE, Kink JA, Mei B, Shahan MN, Raines RT. Use of a human ribonuclease variant, QBI-139, for the treatment of cancer. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.tps162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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19
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Strong LE, Kink JA, Mei B, Shahan MN, Pensinger D, Raines RT. Relationship of QBI-139, a human ribonuclease variant, and RNA in cancer cells. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e13650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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20
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Kang J, Perry JK, Pandey V, Fielder GC, Mei B, Qian PX, Wu ZS, Zhu T, Liu DX, Lobie PE. Artemin is oncogenic for human mammary carcinoma cells. Oncogene 2009; 28:2034-45. [PMID: 19363524 DOI: 10.1038/onc.2009.66] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We report that artemin, a member of the glial cell line-derived neurotrophic factor family of ligands, is oncogenic for human mammary carcinoma. Artemin is expressed in numerous human mammary carcinoma cell lines. Forced expression of artemin in mammary carcinoma cells results in increased anchorage-independent growth, increased colony formation in soft agar and in three-dimensional Matrigel, and also promotes a scattered cell phenotype with enhanced migration and invasion. Moreover, forced expression of artemin increases tumor size in xenograft models and leads to highly proliferative, poorly differentiated and invasive tumors. Expression data in Oncomine indicate that high artemin expression is significantly associated with residual disease after chemotherapy, metastasis, relapse and death. Artemin protein is detectable in 65% of mammary carcinoma and its expression correlates to decreased overall survival in the cohort of patients. Depletion of endogenous artemin with small interfering RNA, or antibody inhibition of artemin, decreases the oncogenicity and invasiveness of mammary carcinoma cells. Artemin is therefore oncogenic for human mammary carcinoma, and targeted therapeutic approaches to inhibit artemin function in mammary carcinoma warrant consideration.
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Affiliation(s)
- J Kang
- The Liggins Institute, University of Auckland, New Zealand
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21
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Strong L, Kink JA, Shahan MN, Mei B, Raines RT. Design of phase 1 trial of a human ribonuclease variant. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.14646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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22
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Nazina TN, Grigor'ian AA, Feng T, Shestakova NM, Babich TL, Pavlova NK, Ivoĭlov VS, Ni F, Wang J, She Y, Xiang T, Mei B, Luo Z, Beliaev SS, Ivanov MV. [Microbiological and production characteristics of the high-temperature Kongdian bed revealed during field trial of biotechnology for the enhancement of oil recovery]. Mikrobiologiia 2007; 76:340-53. [PMID: 17633409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Microbiological technology for the enhancement of oil recovery based on the activation of the stratal microflora was tested in the high-temperature horizons of the Kongdian bed (60 degrees C) of the Dagang oil field (China). This biotechnology consists in the pumping of a water-air mixture and nitrogen and phosphorus mineral salts into the oil stratum through injection wells in order to stimulate the activity of the stratal microflora which produce oil-releasing metabolites. Monitoring of the physicochemical, microbiological, and production characteristics of the test site has revealed large changes in the ecosystem as a result of the application of biotechnology. The cell numbers of thermophilic hydrocarbon-oxidizing, fermentative, sulfate-reducing, and methanogenic microorganisms increased 10-10 000-fold. The rates of methanogenesis and sulfate reduction increased in the near-bottom zone of the injection wells and of some production wells. The microbial oil transformation was accompanied by the accumulation of bicarbonate ions, volatile fatty acids, and biosurfactants in the formation waters, as well as of CH4 and CO2 both in the gas phase and in the oil. Microbial metabolites promoted the additional recovery of oil. As a result of the application of biotechnology, the water content in the production liquid from the test site decreased, and the oil content increased. This allowed the recovery of more than 14000 tons of additional oil over 3.5 years.
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23
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Qian M, Zhang XH, Mei B, Zhang P, Yan Z, Yu M. [Cytotoxic effect of Acanthamoeba trophozoite on HeLa cells]. Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi 2003; 19:37-40. [PMID: 12572022] [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: 02/28/2023]
Abstract
OBJECTIVE To investigate the cytotoxic effect(CTE) on human cervix cancer HeLa cells induced by five strains of pathogenic free-living Acanthamoeba. METHODS The cytotoxic effect of five isolates of Acanthamoeba on HeLa cells was investigated by light microscopy and MTT method. RESULTS The photomicrographs of HeLa cells showed a sequence of cardinal morphological features of apoptosis when HeLa cells were exposed to Acanthamoeba in a time-dependent manner at a ratio of 1:1 for 12 h. MTT method showed more than 50% of tumor cells underwent cytolysis following exposure to A. lugdunensis trophozoites, and only 18% of cells treated with A. polyphaga underwent CTE. The CTE produced by A. lugdunensis and A. quina trophozoites was more rapid than the others, beginning as early as 6 h after coincubation and resulting in cytolysis by 72 h. CONCLUSION These five strains of Acanthamoeba exhibit cytotoxic effects of varying degrees on HeLa cells, inducing apoptosis.
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Affiliation(s)
- M Qian
- Department of Biology, East China Normal University, Shanghai 200062
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24
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Mei B, Vernalde S, Verkest D, De Man H, Lauwereins R. Exploiting loop-level parallelism on coarse-grained reconfigurable architectures using modulo scheduling. ACTA ACUST UNITED AC 2003. [DOI: 10.1049/ip-cdt:20030833] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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25
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Abstract
Previously we reported the development of a novel expression system with Tat/TAR-oriP vectors and HKB11 cell line, which supports high level protein expression (Cho et al. Cytotechnology 2001, 37, 23-30). In the present study, we further demonstrated that HKB11 cells are suitable for high throughput expression (microgram scale) of genomic candidates in transient transfection system for in vitro evaluation of biological functions. HKB11 cells were also shown to support the production of milligram to gram quantities of protein drug candidates for in vivo evaluation of efficacy in various disease models. Stable HKB11 clones secreting high levels of a tissue factor (TF; 40-50 pg/c/d) and B-domain deleted recombinant factor VIII (BDDrFVIII; 5-10 microU/c/d) were derived under serum-free conditions. The specific productivity for these two proteins from the HKB11 cells was 10-fold greater than those from CHO cells derived under the similar conditions. In conclusion, we have demonstrated that the HKB11 cell line is well-suited for transient and long-term production of recombinant proteins.
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Affiliation(s)
- M-S Cho
- Molecular and Cell Biology, Process Sciences, Bayer Biotechnology, 800 Dwight Way, Berkeley, California 94701-1086, USA
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26
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Abstract
During conversion of preadipocytes to adipocytes, growth arrest and subsequent activation of adipocyte genes by the transcription factors, C/EBPalpha and PPARgamma, lead to adipogenesis. During differentiation, these cells not only start expressing those genes necessary for adipocyte function, but also undergo changes in morphology to become rounded lipid filled adipocytes. Various factors in cell-cell communication or cell-matrix interaction may govern whether preadipocytes are kept in an undifferentiated state or undergo differentiation. In an attempt to identify molecules that play critical roles in the conversion of preadipocytes to adipocytes, we cloned by differential screening several regulatory molecules, including pref-1. Pref-1 is an inhibitor of adipocyte differentiation and is synthesized as a plasma membrane protein containing 6 EGF-repeats in the extracellular domain. Pref-1 is highly expressed in 3T3-L1 preadipocytes, but is not detectable in mature fat cells. Dexamethasone, a component of standard differentiation agents, inhibits pref-1 transcription and thereby promotes adipogenesis. Downregulation of pref-1 is required for adipose conversion and constitutive expression of pref-1 inhibits adipogenesis. Conversely, decreasing pref-1 levels by antisense pref-1 transfection greatly enhances adipogenesis. The ectodomain of pref-1 is cleaved to generate a biologically active 50kDa soluble form. There are four major forms of membrane pref-1 resulting from alternate splicing. Two of these forms which have a deletion that includes the putative processing site proximal to the membrane do not produce a biologically active soluble form. This indicates that alternate splicing may determine the range of action, juxtacrine or paracrine, of pref-1.
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Affiliation(s)
- H S Sul
- Department of Nutritional Sciences, University of California, Berkeley 94720, USA.
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27
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Plenefisch J, Xiao H, Mei B, Geng J, Komuniecki PR, Komuniecki R. Secretion of a novel class of iFABPs in nematodes: coordinate use of the Ascaris/Caenorhabditis model systems. Mol Biochem Parasitol 2000; 105:223-36. [PMID: 10693745 DOI: 10.1016/s0166-6851(99)00179-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [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: 02/02/2023]
Abstract
A novel fatty acid binding protein, As-p18, is secreted into both the perivitelline and perienteric fluids of the parasitic nematode, Ascaris suum, and at least eight potential homologues of As-p18 have been identified in the Caenorhabditis elegans genome. The products of the three most closely related homologues are fatty acid binding proteins (LBP-1, LBP-2 and LBP-3) which contain putative secretory signals. Phylogenetic analysis revealed that these secreted fatty acid binding proteins comprise a distinct gene class within the fatty acid binding protein family and are possibly unique to nematodes. To examine the potential sites of As-p18 secretion, the expression of the putative promoters of the C. elegans homologues was examined with GFP reporter constructs. The developmental expression of lbp-1 was identical to that of As-p18 and consistent with the secretion of LBP-1 from the hypodermis to the perivitelline fluid. The expression patterns of lbp-2 and lbp-3 were consistent with the secretion of LBP-2 and LBP-3 from muscle into the perienteric fluid later in development. These studies demonstrate that at least some perivitelline fluid proteins appear to be secreted from the hypodermis prior to the formation of the cuticle and, perhaps more importantly, that this coordinate C. elegans/A. suum approach may be potentially useful for examining a number of key physiological processes in parasitic nematodes.
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Affiliation(s)
- J Plenefisch
- Department of Biology, University of Toledo, OH 43606-3390, USA.
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28
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Xia Y, Spence HJ, Moore J, Heaney N, McDermott L, Cooper A, Watson DG, Mei B, Komuniecki R, Kennedy MW. The ABA-1 allergen of Ascaris lumbricoides: sequence polymorphism, stage and tissue-specific expression, lipid binding function, and protein biophysical properties. Parasitology 2000; 120 ( Pt 2):211-24. [PMID: 10726282 DOI: 10.1017/s0031182099005363] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [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: 11/07/2022]
Abstract
The ABA-1 protein of Ascaris lumbricoides (of humans) and Ascaris suum (of pigs) is abundant in the pseudocoelomic fluid of the parasites and also appears to be released by the tissue-parasitic larvae and the adult stages. The genes encoding the polyprotein precursor of ABA-1 (aba-1) were found to be arranged similarly in the two taxa, comprising tandemly repeating units encoding a large polyprotein which is cleaved to yield polypeptides of approximately 15 kDa which fall into 2 distinct classes, types A and B. The polyprotein possibly comprises only 10 units. The aba-1 gene of A. lumbricoides is polymorphic, and the majority of substitutions observed occur in or near predicted loop regions in the encoded proteins. mRNA for ABA-1 is present in infective larvae within the egg, and in all parasitic stages, but was not detectable in unembryonated eggs. ABA-1 mRNA was confined to the gut of adult parasites, and not in body wall or reproductive tissues. Recombinant protein representing a single A-type unit for the A. lumbricoides aba-1 gene was produced and found to bind retinol (Vitamin A) and a range of fatty acids, including the pharmacologically active lipids lysophosphatidic acid, lysoplatelet activating factor, and there was also evidence of binding to leukotrienes. It failed to bind to any of the anthelmintics screened. Differential Scanning Calorimetry showed that the recombinant protein was highly stable, and unfolded in a single transition at 90.4 degrees C. Analysis of the transition indicated that the protein occurs as a dimer and that the dimer dissociates simultaneously with the unfolding of the monomer units.
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MESH Headings
- Allergens/chemistry
- Allergens/genetics
- Allergens/immunology
- Amino Acid Sequence
- Animals
- Antibodies, Helminth/chemistry
- Antigens, Helminth/chemistry
- Antigens, Helminth/genetics
- Antigens, Helminth/immunology
- Antigens, Plant
- Ascariasis/blood
- Ascariasis/parasitology
- Ascaris lumbricoides/chemistry
- Ascaris lumbricoides/genetics
- Ascaris lumbricoides/immunology
- Ascaris suum/chemistry
- Ascaris suum/genetics
- Ascaris suum/immunology
- Base Sequence
- Calorimetry, Differential Scanning
- China
- DNA, Helminth/chemistry
- DNA, Helminth/isolation & purification
- Gene Expression Regulation
- Guatemala
- Helminth Proteins/chemistry
- Helminth Proteins/genetics
- Helminth Proteins/immunology
- Humans
- Ligands
- Molecular Sequence Data
- Plasmids
- Polymorphism, Genetic/genetics
- Sequence Alignment
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
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Affiliation(s)
- Y Xia
- Division of Infection and Immunity, University of Glasgow, Scotland, UK
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29
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Goetzl EJ, Kong Y, Mei B. Lysophosphatidic acid and sphingosine 1-phosphate protection of T cells from apoptosis in association with suppression of Bax. J Immunol 1999; 162:2049-56. [PMID: 9973477] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Members of a subfamily of G protein-coupled receptors (GPCRs), encoded by five different endothelial differentiation genes (edgs), specifically mediate effects of lysophosphatidic acid (LPA) and sphingosine 1-phosphate (S1P) on cellular proliferation and differentiation. Mechanisms of suppression of apoptosis by LPA and S1P were studied in the Tsup-1 cultured line of human T lymphoblastoma cells, which express Edg-2 and Edg-4 GPCRs for LPA and Edg-3 and Edg-5 GPCRs for S1P. At 10-10 M to 10-7 M, both LPA and S1P protected Tsup-1 cells from apoptosis induced by Abs to Fas, CD2, and CD3 plus CD28 in combination. Apoptosis elicited by C6 ceramide was inhibited by S1P, but not by LPA, in part because ceramide suppressed expression of Edg-2 and Edg-4 surface receptors for LPA without affecting Edg-3 surface receptors for S1P. At 10-9 M to 10-7 M, LPA and S1P significantly suppressed cellular levels of the apoptosis-promoting protein Bax, without altering the levels of Bcl-xL or Bcl-2 assessed by Western blots and immunoassays. Transfections of pairs of antisense plasmids for Edg-2 plus Edg-4 and Edg-3 plus Edg-5, and hygromycin selection of transfectants with reduced expression of the respective Edg R proteins in Western blots, inhibited both protection from apoptosis and reduction in cellular levels of Bax by LPA and S1P. Thus, LPA and S1P protection from apoptosis is mediated by distinct Edg GPCRs and may involve novel effects on Bax regulatory protein.
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Affiliation(s)
- E J Goetzl
- Department of Medicine, University of California Medical Center, San Francisco 94143, USA.
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30
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Fang YE, Shi T, Mei B, Yin Z, Su J. [Clinical application of hydrogel membrane of silicone rubber for preventing adhesion in orthopedics]. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 1998; 15:228-30. [PMID: 12553242] [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: 02/28/2023]
Abstract
Grafting hydrogels onto silicone rubber membranes were prepared by radiation technique for medical application. This material is characterized by high purity, hydrophilia, formation of stable hydrogel after water absorption, good biocompatibility, etc. Clinical application was initiated on the basis of animal experiments. The material was used in 47 cases of joint and tendon injuries, in 9 cases of rheumatoid arthritis, and in 4 other cases; totaling 60 cases. All patients were followed up for three and a half years after surgical operation. A general effectiveness of above 86% was noted.
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Affiliation(s)
- Y E Fang
- Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026
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31
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Mei B, Komuniecki R, Komuniecki PR. Localization of cytochrome oxidase and the 2-methyl branched-chain enoyl CoA reductase in muscle and hypodermis of Ascaris suum larvae and adults. J Parasitol 1997; 83:760-3. [PMID: 9267425] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Rabbit lung-derived third-stage larvae (L3) of Ascaris suum are aerobic and cyanide sensitive but also contain many enzymes specific to anaerobic pathways. To localize these enzymes, diaminobenzidine (DAB) staining for cytochrome oxidase (COX) and immunogold labeling for 2-methylbutyryl enoyl CoA reductase (ECR) were performed on sections of hypodermis and muscle of adults and larvae of A. suum and visualized by transmission electron microscopy. As predicted, adult hypodermal and muscle mitochondria did not exhibit COX staining; however, hypodermal and muscle mitochondria of the L3 and fourth-stage larvae (L4) were DAB positive. In contrast, hypodermal mitochondria from the adult, L3, and L4 did not exhibit ECR immunoreactivity, whereas mitochondria from muscle of all 3 were ECR positive. These observations suggest that both the ECR and COX are colocalized in muscle mitochondria of the L3.
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Affiliation(s)
- B Mei
- Department of Biology, University of Toledo, Ohio 43606-3390, USA
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32
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Mei B, Kennedy MW, Beauchamp J, Komuniecki PR, Komuniecki R. Secretion of a novel, developmentally regulated fatty acid-binding protein into the perivitelline fluid of the parasitic nematode, Ascaris suum. J Biol Chem 1997; 272:9933-41. [PMID: 9092532 DOI: 10.1074/jbc.272.15.9933] [Citation(s) in RCA: 57] [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: 02/04/2023] Open
Abstract
Early development of the parasitic nematode, Ascaris suum, occurs inside a highly resistant eggshell, and the developing larva is bathed in perivitelline fluid. Two-dimensional gel analysis of perivitelline fluid from infective larvae reveals seven major proteins; a cDNA encoding one of these, As-p18, has been cloned, sequenced, and protein expressed in Escherichia coli. The predicted amino acid sequence of As-p18 exhibits similarities to the intracellular lipid-binding protein (iLBP) family including retinoid- and fatty acid-binding proteins (FABP). As-p18 is unusual in that it possesses a hydrophobic leader that is not present in the mature protein, the developmental regulation of its expression, and in terms of its predicted structure. Recombinant As-p18 is a functional FABP with a high affinity for both a fluorescent fatty acid analog (11(((5-(dimethylamino)-1-naphthalenyl)sulfonyl)amino) undecanoic acid) and oleic acid, but not retinol. Circular dichroism of rAs-p18 reveals a high beta-sheet content (62%), which is consistent with secondary structure for the protein predicted from sequence algorithms, and the structure of iLBPs. Unusual features are apparent in a structural model of As-p18 generated from existing crystal structures of iLBPs. As-p18 is not found in unembryonated eggs, begins to be synthesized at about day 3 of development, reaches a maximal concentration with the formation of the first-stage larva and remains abundant in the perivitelline fluid of the second-stage larva. Since As-p18 is not present in the post-infective third-stage larva or adult worm tissues, it appears to be exclusive to the egg. Surprisingly, however, Northern blot analysis yields mRNA for As-p18 not only in the early larval stages, but also the unembryonated egg, third-stage larvae, and ovaries of adult worms, even though the protein is not detectable from any of those sources. As-p18 may play a role in sequestering potentially toxic fatty acids and their peroxidation products, or it may be involved in the maintenance of the impermeable lipid layer of the eggshell.
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Affiliation(s)
- B Mei
- Department of Biology, The University of Toledo, Toledo, Ohio 43606-3390, USA
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33
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An Z, Mei B, Yuan WM, Leong SA. The distal GATA sequences of the sid1 promoter of Ustilago maydis mediate iron repression of siderophore production and interact directly with Urbs1, a GATA family transcription factor. EMBO J 1997; 16:1742-50. [PMID: 9130718 PMCID: PMC1169777 DOI: 10.1093/emboj/16.7.1742] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.8] [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: 02/04/2023] Open
Abstract
The sid1 and urbs1 genes encode L-ornithine N5-oxygenase and a GATA family transcription regulator, respectively, for siderophore biosynthesis in Ustilago maydis. The basic promoter and iron-regulatory sequences of the U. maydis sid1 gene were defined by fusing restriction and Bal31 nuclease-generated deletion fragments of the promoter region with the Escherichia coli beta-glucuronidase (GUS) reporter gene. Sequences required for basal expression of sid1 mapped within 1043 bp upstream of the translation start site and include the first untranslated exon and first intron. Sequences needed for iron-regulated expression of sid1 were localized to a 306 bp region mapping 2.3 and 2.6 kb upstream of the ATG. The 306 bp region contains two G/TGATAA sequences, consensus DNA binding sites of GATA family transcription factors. Deletion or site-directed mutation of either or both GATA sequences resulted in deregulated expression of sid1. In vitro DNA binding studies showed that Urbs1 binds to the 3'-GATA site in the 306 bp iron-responsive region. However, deletion of 1.1 kb between the distal GATA sites and the basal promoter region led to deregulated expression of GUS, indicating that these GATA sequences are by themselves insufficient to regulate sid1. In vitro DNA binding and in vivo reporter gene analysis revealed that siderophores are not co-repressors of Urbs1.
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Affiliation(s)
- Z An
- Department of Plant Pathology, University of Wisconsin, Madison 53706, USA
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Liu C, Ma T, Fang X, Mei B. [Indirect UV detection of short chain carboxylic acids in oil field water by high performance capillary zone electrophoresis]. Se Pu 1997; 15:173-5. [PMID: 15739416] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023] Open
Abstract
Short chain carboxylic acids are the major aqueous organic species in oil field water. It is considered that they play an important role in the geochemical evolution of second porosity in oil reservoir. In this paper, short chain carboxylic acid anions were analyzed by HP(3D)CE high performance capillary electrophoresis system (Hewlett-Packard, Germany) with a buffer system of dinitrobenzoic acid-hexadecyltrimethyl ammonium bromide (CTAB). The influence of buffer pH and the concentrations of electrolyte, surfactant and methanol on the seperation of short chain carboxylic acids have been studied. The results showed that the best separation of short chain carboxylic acids could be done with the buffer of 10mmol/L dinitrobenzoic acid, 0.5mmol/L CTAB and 5% methanol at pH=9. Separations were performed in a 50cm x 50microm i.d. fused silica capillary (effective length 48.5cm) at 25 degrees C. A negative potential of 30kV was used for each experiment. Sample was introduced into the capillary by pressure at 50kPa for 10s. Indirect UV detection was operated at 254nm and reference wavelength at 380nm for all experiments. Negative peak was changed into positive one by exchanging between detection wavelength and reference wavelength. Capillary was rinsed for 10min with 0.1mol/L sodium hydroxide and buffer solution before each run. Oil field water was injected directly after filtered through 0.45microm membrane. The result was satisfactory.
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Affiliation(s)
- C Liu
- Analysis & Test Centre, Jianghan Petroleum Institue, Jingsha, 434102
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35
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Leong SA, An Z, Mei B, McEvoy J, Zhao Q, Markley J. Sequences and proteins required for iron-regulated expression ofsid1ofUstilago maydis. ACTA ACUST UNITED AC 1995. [DOI: 10.1139/b95-237] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The molecular biology of the high affinity, siderophore-mediated iron uptake system of the basidiomycete fungus Ustilago maydis is under investigation. Ustilago maydis produces two cyclic peptide siderophores, ferrichrome and ferrichrome A. Biosynthesis of both siderophores is initiated by ornithine-N5-oxygenase, the product of sid1. sid1 mRNA accumulates only during growth under iron starvation conditions in wild-type cells or constitutively in urbs1 mutants, urbs1 encodes a 100-kDa protein with putative Zn finger domains that share sequence identity with those of the GATA family of transcription factors. The promoter region of sid1 was defined by deletion analysis of a 3.0-kb region 5′ to the translational start of sid1 using the Escherichia coli GUS gene as a reporter. Three regions were defined by this analysis to be critical to expression of sid1. These include (i) a 306-bp region containing two GATA sequences and mapping 2.4 kb from the start of translation; (ii) a 439-bp region immediately 5′ to the start of transcription; and (iii) a region encompassing the first intron of sid1. Deletion of the GATA sequences resulted in deregulated expression of sid1, while elimination of the latter two sequences ablated expression of the gene under all circumstances. Current efforts are focused on determining whether Urbsl interacts directly with the sid1 promoter via the GATA sequences and whether this interaction is dependent upon iron. Key words: GATA, transcription factor, siderophore, ferrichrome, iron, Urbs1.
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Mei B, Budde AD, Leong SA. sid1, a gene initiating siderophore biosynthesis in Ustilago maydis: molecular characterization, regulation by iron, and role in phytopathogenicity. Proc Natl Acad Sci U S A 1993; 90:903-7. [PMID: 8430103 PMCID: PMC45778 DOI: 10.1073/pnas.90.3.903] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.5] [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: 01/30/2023] Open
Abstract
Iron uptake in Ustilago maydis is mediated by production of extracellular hydroxamate siderophores. L-Or-nithine N5-oxygenase catalyzes hydroxylation of L-ornithine, which is the first committed step of ferrichrome and ferrichrome A biosynthesis in U. maydis. We have characterized sid1, a gene coding for this enzyme, by complementation in trans, gene disruption, and DNA sequence analysis. A comparison of genomic DNA and cDNA sequences has shown that the gene is interrupted by three introns. The putative amino acid sequence revealed similarity with Escherichia coli lysine N6-hydroxylase, which catalyzes the hydroxylation of lysine, the first step in biosynthesis of aerobactin. Two transcription initiation points have been determined, both by PCR amplification of the 5' end of the mRNA and by primer extension. A 2.3-kb transcript which accumulates in cells grown under low iron conditions was detected by Northern hybridization. A less abundant 2.7-kb transcript was observed in cells grown in iron-containing medium. By contrast, constitutive accumulation of the 2.3-kb transcript was observed in a mutant carrying a disruption of urbs1, a gene involved in regulation of siderophore biosynthesis. Analysis of the pathogenicity of mutants carrying a null allele of sid1 suggests that the biosynthetic pathway of siderophores does not play an essential role in the infection of maize by U. maydis.
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Affiliation(s)
- B Mei
- Department of Plant Pathology, University of Wisconsin, Madison 53706
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Mei B, Zalkin H. A cysteine-histidine-aspartate catalytic triad is involved in glutamine amide transfer function in purF-type glutamine amidotransferases. J Biol Chem 1989; 264:16613-9. [PMID: 2674138] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
A family of four glutamine amidotransferases has a homologous glutamine amide transfer domain, designated purF-type, that is named after purF-encoded glutamine phosphoribosylpyrophosphate amidotransferase. The glutamine amide transfer domain of approximately 194 amino acid residues is at the NH2 terminus of the protein chain. Site-directed mutagenesis was used to replace several of the 9 invariant amino acids in the glutamine amide transfer domain of glutamine phosphoribosylpyrophosphate amidotransferase. The results indicate that a Cys1-His101-Asp29 catalytic triad is involved in the glutamine amide transfer function of this enzyme. The evidence suggests that His101 functions to increase the nucleophilicity of Cys1, which is used to form a glutamine-enzyme covalent intermediate. Asp29 has a role subsequent to formation of the covalent intermediate. The Cys-His-Asp catalytic triad is implicated in the glutamine amide transfer function of purF-type amidotransferases.
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Affiliation(s)
- B Mei
- Department of Biochemistry, Purdue University, West Lafayette, Indiana 47907
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Mei B, Zalkin H. A cysteine-histidine-aspartate catalytic triad is involved in glutamine amide transfer function in purF-type glutamine amidotransferases. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(19)84750-6] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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