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Mai S, Izumi K, Itamoto S, Kurosawa S, Nagata Y, Hikichi S, Miyazawa H, Tokuchi K, Imafuku K, Yanagi T, Tsutsui M, Ujiie H. Native collagen XVII complex ELISA: An approach for diagnosis and monitoring of anti-integrin β4 mucous membrane pemphigoid. J Eur Acad Dermatol Venereol 2024; 38:e385-e387. [PMID: 37908157 DOI: 10.1111/jdv.19614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 10/27/2023] [Indexed: 11/02/2023]
Affiliation(s)
- S Mai
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - K Izumi
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - S Itamoto
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - S Kurosawa
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Y Nagata
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - S Hikichi
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - H Miyazawa
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - K Tokuchi
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - K Imafuku
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - T Yanagi
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - M Tsutsui
- Department of Dermatology, Sapporo Tokushukai Hospital, Sapporo, Japan
| | - H Ujiie
- Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
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Zhou G, Xie D, Fan R, Yang Z, Du J, Mai S, Xie L, Wang Q, Mai T, Han Y, Lai F. Comparison of Pulmonary and Extrapulmonary Models of Sepsis-Associated Acute Lung Injury. Physiol Res 2023; 72:741-752. [PMID: 38215061 PMCID: PMC10805253] [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] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 09/09/2023] [Indexed: 01/14/2024] Open
Abstract
To compare different rat models of sepsis at different time points, based on pulmonary or extrapulmonary injury mechanisms, to identify a model which is more stable and reproducible to cause sepsis-associated acute lung injury (ALI). Adult male Sprague-Dawley rats were subjected to (1) cecal ligation and puncture (CLP) with single (CLP1 group) or two repeated through-and-through punctures (CLP2 group); (2) tail vein injection with lipopolysaccharide (LPS) of 10mg/kg (IV-LPS10 group) or 20 mg/kg (IV-LPS20 group); (3) intratracheal instillation with LPS of 10mg/kg (IT-LPS10 group) or 20mg/kg (IT-LPS20 group). Each of the model groups had a sham group. 7-day survival rates of each group were observed (n=15 for each group). Moreover, three time points were set for additional experimental studying in each model group: 4 hours, 24 hours and 48 hours after modeling (every time point, n=8 for each group). Rats were sacrificed to collect BALF and lung tissue samples at different time points for detection of IL-6, TNF-alpha, total protein concentration in BALF and MPO activity, HMGB1 protein expression in lung tissues, as well as the histopathological changes of lung tissues. More than 50 % of the rats died within 7 days in each model group, except for the IT-LPS10 group. In contrast, the mortality rates in the two IV-LPS groups as well as the IT-LPS20 group were significantly higher than that in IT-LPS10 group. Rats received LPS by intratracheal instillation exhibited evident histopathological changes and inflammatory exudation in the lung, but there was no evidence of lung injury in CLP and IV-LPS groups. Rat model of intratracheal instillation with LPS proved to be a more stable and reproducible animal model to cause sepsis-associated ALI than the extrapulmonary models of sepsis.
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Affiliation(s)
- G Zhou
- The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
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Mai S, Izumi K, Mai Y, Natsuga K, Ishii N, Sawamura D, Schauer F, Kiritsi D, Nishie W, Ujiie H. Native autoantigen complex detects pemphigoid autoantibodies. JID Innovations 2023; 3:100193. [PMID: 36992950 PMCID: PMC10041560 DOI: 10.1016/j.xjidi.2023.100193] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 01/18/2023] [Accepted: 01/19/2023] [Indexed: 02/22/2023] Open
Abstract
Pemphigoid diseases are a group of autoimmune disorders characterized by subepidermal blistering in the skin and mucosa. Among them, mucous membrane pemphigoid (MMP) autoantibodies are characterized by targeting multiple molecules in the hemidesmosomes, including collagen XVII, laminin-332, and integrin a6/β4. Traditionally, recombinant proteins of the autoantigens have been employed to identify circulating autoantibodies by immune assays. However, developing an efficient detection system for MMP autoantibodies has been challenging because the autoantibodies have heterogeneous profiles and the antibody titers are typically low. In this study, we introduce an ELISA that takes advantage of a native autoantigen complex rather than simple recombinant proteins. We generated HaCaT keratinocytes with a DDDDK-tag knocked in at the COL17A1 locus by CRISPR/Cas9-mediated gene editing. Immunoprecipitation using the DDDDK-tag isolated a native complex that contained full-length and processed collagen XVII and integrin α6/β4. Then, we used the complex proteins to prepare an ELISA system and enrolled 55 MMP cases to validate its diagnostic performance. The sensitivity and specificity of the ELISA for detecting MMP autoantibodies were 70.9% and 86.7%, respectively, far superior to those of conventional assays. In autoimmune diseases such as MMP, in which autoantibodies target various molecules, isolating the antigen-protein complexes can help establish a diagnostic system.
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Rogers S, Baumert B, Blanck O, Böhmer D, Boström J, Engenhart-Cabillic R, Ermis E, Exner S, Guckenberger M, Habermehl D, Hemmatazad H, Henke G, Lohaus F, Lux S, Mai S, Minasch D, Rezazadeh A, Steffal C, Temming S, Wittig A, Zweifel C, Riesterer O, Combs SE. Correction to: Stereotactic radiosurgery and radiotherapy for resected brain metastases: current pattern of care in the Radiosurgery and Stereotactic Radiotherapy Working Group of the German Association for Radiation Oncology (DEGRO). Strahlenther Onkol 2023; 199:113-114. [PMID: 36374315 DOI: 10.1007/s00066-022-02021-1] [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: 11/16/2022]
Affiliation(s)
- S Rogers
- Radio-Onkologie-Zentrum KSA-KSB, Kantonsspital Aarau, 5001, Aarau, Switzerland.
| | - B Baumert
- Kantonsspital Graubünden, 7000, Chur, Switzerland
| | - O Blanck
- Campus Kiel, Universitätsklinikum Schleswig-Holstein, 24105, Kiel, Germany
| | - D Böhmer
- Campus Benjamin Franklin, Charite University Medicine, 12203, Berlin, Germany
| | - J Boström
- Gamma Knife Zentrum, 44892, Bochum, Germany
| | | | - E Ermis
- Bern University Hospital (Inselspital), 3010, Bern, Switzerland
| | - S Exner
- Strahlenzentrum Hamburg, 22419, Hamburg, Germany
| | | | | | - H Hemmatazad
- Bern University Hospital (Inselspital), 3010, Bern, Switzerland
| | - G Henke
- Kantonsspital St. Gallen, 9000, St Gallen, Switzerland
| | - F Lohaus
- University Hospital Dresden, 01307, Dresden, Germany
| | - S Lux
- Radprax Strahlentherapie, 42697, Solingen, Germany
| | - S Mai
- Universitätsmedizin Mannheim, 68167, Mannheim, Germany
| | - D Minasch
- University Hospital Innsbruck, 6020, Innsbruck, Austria
| | - A Rezazadeh
- University Hospital of Cologne, 50937, Cologne, Germany
| | - C Steffal
- KFJ/SMZ-Süd Vienna, Klinik Favoriten, 1100, Vienna, Austria
| | - S Temming
- Robert Janker Klinik, 53129, Bonn, Germany
| | - A Wittig
- University Hospital Jena, 07743, Jena, Germany
| | - C Zweifel
- Kantonsspital Graubünden, 7000, Chur, Switzerland
| | - O Riesterer
- Radio-Onkologie-Zentrum KSA-KSB, Kantonsspital Aarau, 5001, Aarau, Switzerland
| | - S E Combs
- Kinik an der Isaar, Technisches Universität München, Munich, Germany
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Gong QM, Mai S, Quan JJ, Huang LJ, Liu HY, Wei X. [A preliminary study on the construction and application of the smart classroom teaching mode in endodontics]. Zhonghua Kou Qiang Yi Xue Za Zhi 2022; 57:1237-1242. [PMID: 36509524 DOI: 10.3760/cma.j.cn112144-20220919-00492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Objective: To evaluate the application effect of smart classroom teaching mode in undergraduate teaching of endodontics. Methods: Through micro-lecture and massive open online course which were closely integrated with clinical practice and frontier advances, we build a new smart classroom teaching mode of endodontics relying on information technology such as the medical education cloud APP platform. The mode was applied to the undergraduate teaching of grade 2017 (110 students) and grade 2018 (107 students) in 2020 and 2021 respectively (experimental group). The theoretical examination was conducted for the grade 2016 (control group, 111 students applied traditional teaching methods) in 2019, and for two experimental grades in 2020 and 2021 respectively. A questionnaire survey was conducted for the 2018 undergraduates to investigate the experience of the smart classroom teaching mode, and the application effect of the smart classroom teaching mode was evaluated by comparing the offline theoretical test scores of grades 2016, 2017 and 2018. Results: The results of the questionnaire showed that students in grade 2018 recognized the overall form of smart classroom teaching mode, and 75.2% (79/105) of the students satisfied with the teaching process, considering that it could enhance learning interest and enthusiasm, improve self-learning ability, facilitate the understanding and memory of knowledge points, as well as increase the extension and expansion of professional knowledge. Thirty-seven point one percent (39/105) of the students thought that smart classroom teaching mode was not conducive to the interaction between teachers and students and couldn't improve learning efficiency. Comparing the final theoretical examination scores of students in three years, it was found that the average scores of 2021 (78.79±9.88) and 2020 (76.45±8.33) were significantly higher than that of 2019 (67.67±10.58) (t=6.77, P<0.001; t=8.51, P<0.001). The average score in 2021 was higher than that in 2020, although the difference was not significant (t=1.79, P=0.223). Conclusions: The application of smart classroom mode improved the teaching effect of endodontics, which is worthy of further promotion to provide a positive reference in improving the educating effects of oral medicine.
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Affiliation(s)
- Q M Gong
- Department of Operative Dentistry and Endodontics, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
| | - S Mai
- Department of Operative Dentistry and Endodontics, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
| | - J J Quan
- Department of Operative Dentistry and Endodontics, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
| | - L J Huang
- Department of Operative Dentistry and Endodontics, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
| | - H Y Liu
- Department of Operative Dentistry and Endodontics, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
| | - X Wei
- Department of Operative Dentistry and Endodontics, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
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Rogers S, Baumert B, Blanck O, Böhmer D, Boström J, Engenhart-Cabillic R, Ermis E, Exner S, Guckenberger M, Habermehl D, Hemmatazad H, Henke G, Lohaus F, Lux S, Mai S, Minasch D, Rezazadeh A, Steffal C, Temming S, Wittig A, Zweifel C, Riesterer O, Combs S. Stereotactic radiosurgery and radiotherapy for resected brain metastases: current pattern of care in the Radiosurgery and Stereotactic Radiotherapy Working Group of the German Association for Radiation Oncology (DEGRO). Strahlenther Onkol 2022; 198:919-925. [PMID: 36006436 DOI: 10.1007/s00066-022-01991-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 03/24/2022] [Accepted: 07/17/2022] [Indexed: 11/25/2022]
Abstract
PURPOSE Preoperative stereotactic radiosurgery (SRS) of brain metastases may achieve similar local control and better leptomeningeal control rates than postoperative fractionated stereotactic radiotherapy (FSRT) in patients treated with elective metastasectomy. To plan a multicentre trial of preoperative SRS compared with postoperative FSRT, a survey of experts was conducted to determine current practice. METHODS A survey with 15 questions was distributed to the DEGRO Radiosurgery and Stereotactic Radiotherapy Working Group. Participants were asked under what circumstances they offered SRS, FSRT, partial and/or whole brain radiotherapy before or after resection of a brain metastasis, as well as the feasibility of preoperative stereotactic radiosurgery and neurosurgical resection within 6 days. RESULTS Of 25 participants from 24 centres, 22 completed 100% of the questions. 24 respondents were radiation oncologists and 1 was a neurosurgeon. All 24 centres have one or more dedicated radiosurgery platform and all offer postoperative FSRT. Preoperative SRS is offered by 4/24 (16.7%) centres, and 9/24 (37.5%) sometimes recommend single-fraction postoperative SRS. Partial brain irradiation is offered by 8/24 (33.3%) centres and 12/24 (50%) occasionally recommend whole-brain irradiation. Two centres are participating in clinical trials of preoperative SRS. SRS techniques and fractionation varied between centres. CONCLUSION All responding centres currently offer postoperative FSRT after brain metastasectomy. Approximately one third offer single-fraction postoperative SRS and four already perform preoperative SRS. With regard to potential co-investigators, 18 were identified for the PREOP‑2 multicentre trial, which will randomise between preoperative SRS and postoperative FSRT.
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Affiliation(s)
- S Rogers
- Radio-Onkologie-Zentrum KSA-KSB, Kantonsspital Aarau, 5001, Aarau, Switzerland.
| | - B Baumert
- Kantonsspital Graubünden, 7000, Chur, Switzerland
| | - O Blanck
- Universitätsklinikum Schleswig-Holstein, Campus Kiel, 24105, Kiel, Germany
| | - D Böhmer
- Charite University Medicine, Campus Benjamin Franklin, 12203, Berlin, Germany
| | - J Boström
- Gamma Knife Zentrum, 44892, Bochum, Germany
| | | | - E Ermis
- Bern University Hospital (Inselspital), 3010, Bern, Switzerland
| | - S Exner
- Strahlenzentrum Hamburg, 22419, Hamburg, Germany
| | | | | | - H Hemmatazad
- Bern University Hospital (Inselspital), 3010, Bern, Switzerland
| | - G Henke
- Kantonsspital St. Gallen, 9000, St Gallen, Switzerland
| | - F Lohaus
- University Hospital Dresden, 01307, Dresden, Germany
| | - S Lux
- Radprax Strahlentherapie, 42697, Solingen, Germany
| | - S Mai
- Universitätsmedizin Mannheim, 68167, Mannheim, Germany
| | - D Minasch
- University Hospital Innsbruck, 6020, Innsbruck, Austria
| | - A Rezazadeh
- University Hospital of Cologne, 50937, Cologne, Germany
| | - C Steffal
- KFJ/SMZ-Süd Vienna; Klinik Favoriten, 1100, Vienna, Austria
| | - S Temming
- Robert Janker Klinik, 53129, Bonn, Germany
| | - A Wittig
- University Hospital Jena, 07743, Jena, Germany
| | - C Zweifel
- Kantonsspital Graubünden, 7000, Chur, Switzerland
| | - O Riesterer
- Radio-Onkologie-Zentrum KSA-KSB, Kantonsspital Aarau, 5001, Aarau, Switzerland
| | - S Combs
- Kinik an der Isaar, Technisches Universität München, Munich, Germany
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Sofokleous M, Christofi A, Malamis D, Mai S, Barampouti EM. Bioethanol and biogas production: an alternative valorisation pathway for green waste. Chemosphere 2022; 296:133970. [PMID: 35176302 DOI: 10.1016/j.chemosphere.2022.133970] [Citation(s) in RCA: 2] [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: 11/30/2021] [Revised: 01/26/2022] [Accepted: 02/11/2022] [Indexed: 06/14/2023]
Abstract
Biofuels are a research field of great interest given the environmental benefits they offer over conventional fossil fuels. Nowadays, it is urgent to find ways of utilizing waste in the direction of biofuels production. The aim of this paper was the utilization of green waste (branches, leaves and ligno-cellulosic residues from tree prunings, hedge cuttings and grass clippings) towards biofuels production and specifically towards bioethanol and biogas. The experimental plan that was followed included biogas production through anaerobic digestion and bioethanol production through alcoholic fermentation after the necessary chemical pretreatment (acid or alkaline hydrolysis) prior to enzymatic hydrolysis and fermentation. Based on the results obtained, three valorisation scenarios of green waste were designed and compared in terms of product mass intensity, product yield and energy content of biofuels produced. The optimal results for bioethanol production were 5.22 g/L ethanol, 70.61% saccharification yield and 33.67% ethanol yield with acid pretreatment using H2SO4 3% w/v, 475 μL/g cellulose CellicCtec2 and 10% solids loading. Regarding biogas, the highest biogas production observed was 267.1 mL biogas/g dry substrate resulting from anaerobic digestion of the alkaline stillage. Thus, the production of biofuels from green waste is technically feasible, although it provides moderate efficiencies. However, for a sustainable valorisation of green waste, other techno-economic factors such as the cost of enzymes, chemicals, energy, etc. must be taken into account.
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Affiliation(s)
- M Sofokleous
- National Technical University of Athens, School of Chemical Engineering, Unit of Environmental Science & Technology, 9 Iroon Polytechniou Str., Zographou Campus, GR-15780 Athens, Greece
| | - A Christofi
- National Technical University of Athens, School of Chemical Engineering, Unit of Environmental Science & Technology, 9 Iroon Polytechniou Str., Zographou Campus, GR-15780 Athens, Greece
| | - D Malamis
- National Technical University of Athens, School of Chemical Engineering, Unit of Environmental Science & Technology, 9 Iroon Polytechniou Str., Zographou Campus, GR-15780 Athens, Greece
| | - S Mai
- National Technical University of Athens, School of Chemical Engineering, Unit of Environmental Science & Technology, 9 Iroon Polytechniou Str., Zographou Campus, GR-15780 Athens, Greece
| | - E M Barampouti
- National Technical University of Athens, School of Chemical Engineering, Unit of Environmental Science & Technology, 9 Iroon Polytechniou Str., Zographou Campus, GR-15780 Athens, Greece.
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Li YY, Cen H, Gong BN, Mai S, Wang QL, Mou S, Li Y. TCR-Induced Tyrosine Phosphorylation at Tyr270 of SUMO Protease SENP1 by Lck Modulates SENP1 Enzyme Activity and Specificity. Front Cell Dev Biol 2022; 9:789348. [PMID: 35186948 PMCID: PMC8847397 DOI: 10.3389/fcell.2021.789348] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 12/13/2021] [Indexed: 12/13/2022] Open
Abstract
Small ubiquitin-like modifier (SUMO) modification plays an important regulatory role in T cell receptor (TCR) signaling transduction. SUMO-specific proteases (SENPs) have dual-enzyme activities; they can both process SUMO precursors as endopeptidases and participate in SUMO deconjugation as isopeptidases. It remains unclear how the SUMO system, especially SENP1, is regulated by TCR signaling. Here, we show that Lck phosphorylates tyrosine 270 (Y270) of SENP1 upon TCR stimulation, indicating that SENP1 is a substrate of Lck. In vitro endopeptidase activity analysis showed that mutating SENP1 Y270 to either phenylalanine (F) to mimic the phosphorylation-defective state or to glutamate (E) to mimic the negative charge of tyrosine phosphorylation in the enzyme microenvironment did not change its endopeptidase activity towards pre-SUMO1. However, SENP1 Y270E but not Y270F mutation exhibited decreased endopeptidase activity towards pre-SUMO3. Through in vivo isopeptidase activity analysis by rescue expression of SENP1 and its Y270 mutants in a SENP1 CRISPR knockout T cell line, we found that SENP1 Y270F downregulated its isopeptidase activity towards both SUMO1 and SUMO2/3 conjugation by reducing SENP1 binding with sumoylated targets. While overexpression of SENP1 inhibited TCR-induced IL-2 production, overexpression of SENP1 Y270F enhanced it instead. In summary, TCR-induced Y270 phosphorylation of SENP1 may promote its isopeptidase activity and specifically decrease its endopeptidase activity against pre-SUMO3, which finely tunes activation of T cells.
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Affiliation(s)
- Yun-Yi Li
- Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Haohua Cen
- Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Bei-Ni Gong
- Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Siqi Mai
- Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Qi-Long Wang
- Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Sisi Mou
- Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Yingqiu Li
- Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
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Freitas M, Santos AD, Barbosa L, Figueiredo AD, Pellegrini S, Santos N, Paiva I, Rangel-Pozzo A, Sisdelli L, Mai S, Land M, Ribeiro M, Ribeiro M. Cellular consequences of small supernumerary marker chromosome derived from chromosome 12: mosaicism in daughter and father. Braz J Med Biol Res 2022; 55:e12072. [PMID: 35766708 PMCID: PMC9224815 DOI: 10.1590/1414-431x2022e12072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 04/14/2022] [Indexed: 11/21/2022] Open
Abstract
Constitutional genomic imbalances are known to cause malformations, disabilities, neurodevelopmental delay, and dysmorphia and can lead to dysfunctions in the cell cycle. In extremely rare genetic conditions such as small supernumerary marker chromosomes (sSMC), it is important to understand the cellular consequences of this extra marker, as well the factors that contribute to their maintenance or elimination through successive cell cycles and phenotypic impact. The study of chromosomal mosaicism provides a natural model to characterize the effect of aneuploidy on genome stability and compare cells with the same genetic background and environment exposure, but differing in the presence of sSMC. Here, we report the functional characterization of different cell lines from two familial patients with mosaic sSMC derived from chromosome 12. We performed studies of proliferation dynamics, stability, and variability of these cells using fluorescent in situ hybridization (FISH), sister chromatid exchanges (SCE), and conventional staining. We also quantified the telomere-related genomic instability of sSMC cells using 3D telomeric profile analysis by quantitative-FISH. sSMC cells exhibited differences in the cell cycle dynamics compared to normal cells. First, the sSMC cells exhibited lower proliferation index and higher frequency of SCE than normal cells, associated with a higher level of chromosomal instability. Second, sSMC cells exhibited more telomeric-related genomic instability. Lastly, the differences of sSMC cells distribution among tissues could explain different phenotypic repercussions observed in patients. These results will help in our understanding of the sSMC stability, maintenance during cell cycle, and the cell cycle variables involved in the different phenotypic manifestations.
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Affiliation(s)
- M.O. Freitas
- Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil; Universidade Federal do Rio de Janeiro, Brasil
| | - A.O. dos Santos
- Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil; Universidade Federal do Rio de Janeiro, Brasil
| | - L.S. Barbosa
- Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil
| | - A.F. de Figueiredo
- Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil; Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil
| | - S.P. Pellegrini
- Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil
| | - N.C.K. Santos
- Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil
| | - I.S. Paiva
- Universidade do Grande Rio, Brasil; UNIFESO (Centro Educacional Serra dos Orgãos), Brasil
| | - A. Rangel-Pozzo
- CancerCare Manitoba Research Institute, University of Manitoba, Cancer Care Manitoba, Canada
| | - L. Sisdelli
- CancerCare Manitoba Research Institute, University of Manitoba, Cancer Care Manitoba, Canada; Universidade Federal de São Paulo, Brasil
| | - S. Mai
- CancerCare Manitoba Research Institute, University of Manitoba, Cancer Care Manitoba, Canada
| | - M.G.P. Land
- Universidade Federal do Rio de Janeiro, Brasil; Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil
| | - M.G. Ribeiro
- Universidade Federal do Rio de Janeiro, Brasil; Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil
| | - M.C.M. Ribeiro
- Instituto de Puericultura e Pediatria Martagão Gesteira, Universidade Federal do Rio de Janeiro, Brasil; Campus Duque de Caxias, Universidade Federal do Rio de Janeiro, Brasil
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10
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Schauer F, Mai S, Hofmann S, Mai Y, Izumi K, Kern J, Nishie W, Kiritsi D. LB710 Detection of novel BP180 epitopes in Pemphigoid Gestationis. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.07.080] [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: 10/20/2022]
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11
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Mele C, Crinò A, Fintini D, Mai S, Convertino A, Bocchini S, Di Paolo P, Grugni G, Aimaretti G, Scacchi M, Marzullo P. Angiopoietin-like 8 (ANGPTL8) as a potential predictor of NAFLD in paediatric patients with Prader-Willi Syndrome. J Endocrinol Invest 2021; 44:1447-1456. [PMID: 33067796 PMCID: PMC8195791 DOI: 10.1007/s40618-020-01444-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 10/06/2020] [Indexed: 01/15/2023]
Abstract
PURPOSE Angiopoietin-like 8 (ANGPTL8) is a liver- and adipose tissue-produced protein that predicts non-alcoholic fatty liver disease (NAFLD) and altered metabolic homeostasis in the general population as well as in persons with common and genetic obesity, including the Prader-Willi syndrome (PWS). However, its metabolic correlate in paediatric patients with respect to PWS is unknown. METHODS This cross-sectional study investigated circulating ANGPTL8 and adipocytokines levels in 28 PWS and 28 age-, sex- and BMI-matched children and adolescents (age, 7.0-17.8y) in relation to NAFLD and metabolic homeostasis assessed by OGTT, paediatric metabolic index (PMI) and fatty liver index (FLI), liver ultrasonography (US), as well as dual-energy X-ray absorptiometry (DEXA) for analysis of fat (FM) and fat-free mass (FFM). RESULTS At the set level of significance, PWS children showed lower values of FFM (p < 0.01) but healthier insulin profiles (p < 0.01) and PMI values (p < 0.05) than matched controls. By US, the prevalence of NAFLD was similar between groups but less severe in PWS than controls. Analysis of ANGPTL8 levels showed no difference between groups, yet only in PWS ANGPTL8 levels were associated with ALT levels, FLI values and NAFLD. In stepwise multivariable regression analysis on merged data, ANGPTL8 levels were independently predicted by BMI SDS, leptin levels and NAFLD. CONCLUSION ANGPTL8 levels are similar in PWS and controls and, overall, they are directly associated with the presence and severity of NAFLD in patients with PWS.
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Affiliation(s)
- C Mele
- Division of Endocrinology, Department of Translational Medicine, University of Piemonte Orientale, Novara, Italy
- Division of General Medicine, Istituto Auxologico Italiano, IRCCS, San Giuseppe Hospital, Piancavallo, Verbania, Italy
| | - A Crinò
- Reference Center for Prader-Willi Syndrome, Bambino Gesù Children's Hospital, Research Institute, Palidoro (Rome), Italy
| | - D Fintini
- Reference Center for Prader-Willi Syndrome, Bambino Gesù Children's Hospital, Research Institute, Palidoro (Rome), Italy
| | - S Mai
- Laboratory of Metabolic Research, Istituto Auxologico Italiano, IRCCS, San Giuseppe Hospital, Piancavallo, Verbania, Italy
| | - A Convertino
- Reference Center for Prader-Willi Syndrome, Bambino Gesù Children's Hospital, Research Institute, Palidoro (Rome), Italy
| | - S Bocchini
- Reference Center for Prader-Willi Syndrome, Bambino Gesù Children's Hospital, Research Institute, Palidoro (Rome), Italy
| | - P Di Paolo
- Radiology Unit, Bambino Gesù Children's Hospital, Research Institute, Palidoro (Rome), Italy
| | - G Grugni
- Division of Auxology and Metabolic Diseases, Istituto Auxologico Italiano, IRCCS, San Giuseppe Hospital, Piancavallo, Verbania, Italy
| | - G Aimaretti
- Division of Endocrinology, Department of Translational Medicine, University of Piemonte Orientale, Novara, Italy
| | - M Scacchi
- Division of General Medicine, Istituto Auxologico Italiano, IRCCS, San Giuseppe Hospital, Piancavallo, Verbania, Italy
| | - P Marzullo
- Division of Endocrinology, Department of Translational Medicine, University of Piemonte Orientale, Novara, Italy.
- Division of General Medicine, Istituto Auxologico Italiano, IRCCS, San Giuseppe Hospital, Piancavallo, Verbania, Italy.
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12
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Mai S, Wei X, Ling JQ. [Development strategies and progress of composite resin filling material]. Zhonghua Kou Qiang Yi Xue Za Zhi 2021; 56:51-56. [PMID: 34645235 DOI: 10.3760/cma.j.cn112144-20201103-00549] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Composite resin filling material is the first choice for tooth direct bonding restoration. Its good performance can meet the requirements of clinical tooth repair treatment. It is used to restore the structure, aesthetic and function of defected teeth with a way of minimally invasive intervention. To further improve its clinical efficacy, the fundamental strategy is to ameliorate the limitation of material properties. Based on the summary of current research progress, this article focuses on the property of improved composite resin material, and the progress of developing novel resin material including antibacterial composite resin, bioactive remineralizing resin as well as self-healing resin, so as to provide innovative ideas for the future research of new composite resin filling materials.
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Affiliation(s)
- S Mai
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
| | - X Wei
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
| | - J Q Ling
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
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13
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Ektesabi AM, Mori K, Tsoporis J, Walsh C, Mai S, Hu P, DosSantos C. REGULATION OF MIR-187B IN ENDOTOXEMIC PRIMARY CARDIOMYOCYTES AND SEPTIC MURINE HEARTS TREATED WITH MESENCHYMAL STROMAL/STEM CELLS. Can J Cardiol 2019. [DOI: 10.1016/j.cjca.2019.07.444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Zhang XL, Yuan L, Zeng Y, Mai S. [Advance in evaluation of lumbar function after long fixation of degenerative scoliosis]. Zhonghua Wai Ke Za Zhi 2019; 57:397-400. [PMID: 31091596 DOI: 10.3760/cma.j.issn.0529-5815.2019.05.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
With the aging of the population, the incidence of degenerative lumbar scoliosis has increased year by year. Long-segment orthopedic fixation surgery is an important method for the treatment of severe degenerative lumbar scoliosis. Currently, the evaluation of postoperative results is mainly based on the degree of relief of postoperative clinical symptoms, as well as the improvement of imaging deformity and balance. The studies show that although surgery has high difficulty and risk, most patients can benefit from surgery. Besides, it is reported that long-segment fixation can alleviate the symptoms of pain and improve the quality of life. However, it also decreases the local activity of the lumbar spine, leading to stiffness of lumbar, which may affect the activities of daily living (ADL) partly. Lumbar Stiffness Disability Index (LSDI) is a scale for evaluating the impact of lumbar spine stiffness on ADL. The scale has certain limitations and needs to be applied to Chinese people on the basis of optimization. In this paper, the researches of lumbar spine function evaluation after degenerative lumbar scoliosis and long segmental orthopedic fixation and the clinical use of LSDI are briefly reviewed.
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Affiliation(s)
- X L Zhang
- Department of Orthopaedics, Peking University Third Hospital, Beijing 100191, China
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15
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Zhou C, Xie Z, Qin Y, Xie X, Lin X, Zhang J, Ouyang M, Li B, Liu J, Mai S, Zhang L. P2.01-121 Genomic Profiling of Pulmonary Lymphoepithelioma-Like Carcinoma. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1176] [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: 10/28/2022]
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16
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Mele C, Tagliaferri MA, Saraceno G, Mai S, Vietti R, Zavattaro M, Aimaretti G, Scacchi M, Marzullo P. Serum uric acid potentially links metabolic health to measures of fuel use in lean and obese individuals. Nutr Metab Cardiovasc Dis 2018; 28:1029-1035. [PMID: 30139687 DOI: 10.1016/j.numecd.2018.06.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 06/04/2018] [Accepted: 06/12/2018] [Indexed: 12/22/2022]
Abstract
BACKGROUND AND AIMS Uric acid (UA) is a byproduct of the high-energy purine metabolism and is conventionally regarded as a marker of cardio-metabolic impairment. Its potential relationship with energy homeostasis is unknown to date. METHODS AND RESULTS In a cross-sectional study on 121 otherwise healthy obese and 99 sex- and-age-matched lean subjects, UA levels were analyzed in relation to metabolic health, inflammatory markers, respiratory quotient (RQ) and resting energy expenditure (REE) as assessed by indirect calorimetry, fat mass (%FM) and fat-free mass (FFM) as determined by bioimpedance analysis. As expected, obese and lean subjects differed in BMI, glucolipid homeostasis, leptin and insulin levels, inflammatory markers, %FM and FFM (p < 0.001 for all). Likewise, UA levels (p < 0.001) and rates of hyperuricaemia (40.5% vs 3.0%, p < 0.0001) were also higher in obese than lean controls. Further, indirect calorimetry confirmed that obesity increased REE and decreased RQ significantly (p < 0.001). Beyond the expected metabolic correlates, in individual and merged groups UA levels were associated negatively with RQ and positively with REE (p < 0.0001 for both). In multivariable regression analysis, significant independent predictors of UA were BMI and sex. When BMI was replaced by measures of body composition, %FM and FFM emerged as significant predictors of serum UA (p < 0.0001). CONCLUSIONS A potential link relates serum UA to measures of resting energy expenditure and their determinants.
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Affiliation(s)
- C Mele
- Division of General Medicine, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy; Department of Translational Medicine, University of Piemonte Orientale, via Solaroli 17, 28100, Novara, Italy
| | - M A Tagliaferri
- Division of General Medicine, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
| | - G Saraceno
- Division of General Medicine, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
| | - S Mai
- Laboratory of Metabolic Research, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
| | - R Vietti
- Laboratory of Metabolic Research, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
| | - M Zavattaro
- Department of Translational Medicine, University of Piemonte Orientale, via Solaroli 17, 28100, Novara, Italy
| | - G Aimaretti
- Department of Translational Medicine, University of Piemonte Orientale, via Solaroli 17, 28100, Novara, Italy
| | - M Scacchi
- Division of General Medicine, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy
| | - P Marzullo
- Division of General Medicine, Ospedale S. Giuseppe, Istituto Auxologico Italiano, via Cadorna 90, 28824, Piancavallo di Oggebbio (VB), Italy; Department of Translational Medicine, University of Piemonte Orientale, via Solaroli 17, 28100, Novara, Italy.
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Mansouri S, Mai S, Bounssir A, Benzekri L, Ismaili N, Hassam B. Lombalgies et neurofibromatose de type 1 : une association à ne pas négliger. Ann Dermatol Venereol 2017. [DOI: 10.1016/j.annder.2017.09.265] [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: 10/18/2022]
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18
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Templeman JR, Mai S, Shoveller AK. 881 Assessment of current musher practices across the sled dog industry. J Anim Sci 2017. [DOI: 10.2527/asasann.2017.881] [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: 11/13/2022] Open
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Sunpaweravong S, Sunpaweravong P, Sathitruangsak C, Mai S. Three-dimensional telomere architecture of esophageal squamous cell carcinoma: comparison of tumor and normal epithelial cells. Dis Esophagus 2016; 29:307-13. [PMID: 25625311 DOI: 10.1111/dote.12317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Telomeres are repetitive nucleotide sequences (TTAGGG)n located at the ends of chromosomes that function to preserve chromosomal integrity and prevent terminal end-to-end fusions. Telomere loss or dysfunction results in breakage-bridge-fusion cycles, aneuploidy, gene amplification and chromosomal rearrangements, which can lead to genomic instability and promote carcinogenesis. Evaluating the hypothesis that changes in telomeres contribute to the development of esophageal squamous cell carcinoma (ESCC) and to determine whether there are differences between young and old patients, we compared the three-dimensional (3D) nuclear telomere architecture in ESCC tumor cells with that of normal epithelial cells obtained from the same patient. Patients were equally divided by age into two groups, one comprising those less than 45 years of age and the other consisting of those over 80 years of age. Tumor and normal epithelial cells located at least 10 cm from the border of the tumor were biopsied in ESCC patients. Hematoxylin and eosin staining was performed for each sample to confirm and identify the cancer and normal epithelial cells. This study was based on quantitative 3D fluorescence in situ hybridization (Q-FISH), 3D imaging and 3D analysis of paraffin-embedded slides. The 3D telomere architecture data were computer analyzed using 100 nuclei per slide. The following were the main parameters compared: the number of signals (number of telomeres), signal intensity (telomere length), number of telomere aggregates, and nuclear volume. Tumor and normal epithelial samples from 16 patients were compared. The normal epithelial cells had more telomere signals and higher intensities than the tumor cells, with P-values of P < 0.0001 and P = 0.0078, respectively. There were no statistically significant differences in the numbers of telomere aggregates or the nuclear volumes between the tumor and normal epithelial cells. Secondary analyses examined the effects of age on 3D telomere architecture and found no statistically significant differences in any parameter tested between the young and old patients in either the tumor or epithelial cells. The 3D nuclear telomeric signature was able to detect differences in telomere architecture between the ESCC and normal epithelial tissues. However, there were no differences observed between the young and old patients.
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Affiliation(s)
- S Sunpaweravong
- Genomic Center for Cancer Research and Diagnosis, Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, Manitoba, Canada.,Department of Surgery, Faculty of Medicine, Prince of Songkla University, Songkla, Thailand
| | - P Sunpaweravong
- Genomic Center for Cancer Research and Diagnosis, Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, Manitoba, Canada.,Department of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Songkla, Thailand
| | - C Sathitruangsak
- Genomic Center for Cancer Research and Diagnosis, Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, Manitoba, Canada.,Department of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Songkla, Thailand
| | - S Mai
- Genomic Center for Cancer Research and Diagnosis, Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, Manitoba, Canada
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Bronshtein I, Kepten E, Kanter I, Berezin S, Lindner M, Redwood AB, Mai S, Gonzalo S, Foisner R, Shav-Tal Y, Garini Y. Loss of lamin A function increases chromatin dynamics in the nuclear interior. Nat Commun 2015; 6:8044. [PMID: 26299252 PMCID: PMC4560783 DOI: 10.1038/ncomms9044] [Citation(s) in RCA: 177] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Accepted: 07/11/2015] [Indexed: 01/25/2023] Open
Abstract
Chromatin is organized in a highly ordered yet dynamic manner in the cell nucleus, but the principles governing this organization remain unclear. Similarly, it is unknown whether, and how, various proteins regulate chromatin motion and as a result influence nuclear organization. Here by studying the dynamics of different genomic regions in the nucleus of live cells, we show that the genome has highly constrained dynamics. Interestingly, depletion of lamin A strikingly alters genome dynamics, inducing a dramatic transition from slow anomalous diffusion to fast and normal diffusion. In contrast, depletion of LAP2α, a protein that interacts with lamin A and chromatin, has no such effect on genome dynamics. We speculate that chromosomal inter-chain interactions formed by lamin A throughout the nucleus contribute to chromatin dynamics, and suggest that the molecular regulation of chromatin diffusion by lamin A in the nuclear interior is critical for the maintenance of genome organization.
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Affiliation(s)
- I. Bronshtein
- Physics Department and Nanotechnology Institute, Bar Ilan University, Ramat Gan 5290002, Israel
- The Mina & Everard Goodman Faculty of Life Sciences and Nanotechnology Institute, Bar Ilan University, Ramat Gan 5290002, Israel
| | - E. Kepten
- Physics Department and Nanotechnology Institute, Bar Ilan University, Ramat Gan 5290002, Israel
| | - I. Kanter
- Physics Department and Nanotechnology Institute, Bar Ilan University, Ramat Gan 5290002, Israel
| | - S. Berezin
- Physics Department and Nanotechnology Institute, Bar Ilan University, Ramat Gan 5290002, Israel
| | - M. Lindner
- Physics Department and Nanotechnology Institute, Bar Ilan University, Ramat Gan 5290002, Israel
| | - Abena B. Redwood
- Edward A. Doisy Department of Biochemistry and Molecular Biology, School of Medicine, St Louis University, 1100 South Grand Ave. St Louis, Missouri 63104, USA
| | - S Mai
- Manitoba Institute of Cell Biology, Department of Physiology and Pathophysiology, University of Manitoba, Cancer Care Manitoba, Winnipeg, Manitoba, Canada R3E 0V9
| | - S. Gonzalo
- Edward A. Doisy Department of Biochemistry and Molecular Biology, School of Medicine, St Louis University, 1100 South Grand Ave. St Louis, Missouri 63104, USA
| | - R. Foisner
- Max F. Perutz Laboratories, Medical University Vienna, Vienna Biocenter (VBC), Dr. Bohr-Gasse 9, 1030 Vienna, Austria
| | - Y. Shav-Tal
- The Mina & Everard Goodman Faculty of Life Sciences and Nanotechnology Institute, Bar Ilan University, Ramat Gan 5290002, Israel
| | - Y. Garini
- Physics Department and Nanotechnology Institute, Bar Ilan University, Ramat Gan 5290002, Israel
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Abstract
BACKGROUND The purpose of this study was to evaluate long-term clinical and radiological results as well as survival rates of the NexGen® CR posterior cruciate retaining prosthesis. PATIENTS AND METHODS We evaluated a consecutive series of 761 total knee replacements performed on 716 patients from 1999 to 2001 at our institution. All patients had been recorded prospectively in our in-house arthroplasty register. Follow-up data were available for 379 patients at 10 years postoperatively. Functional outcome was evaluated using the Knee Society score. An additional radiographic evaluation was performed on 224 patients at 10 years. The mean age of the patients at the time of surgery was 71 years. 75 % of the patients were female, 25 % were male. Mean BMI of the patients was 29.2 kg/m(2). The preoperative diagnosis was osteoarthritis in 91 %, rheumatoid arthritis in 5,5 % and posttraumatic osteoarthritis in 2 %. Patella resurfacing was performed in 4 %. All components were cemented. RESULTS AND DISCUSSION Mean Knee Society clinical score improved from 26.7 points preoperatively to 88.5 points at the time of the latest follow-up, and mean Knee Society function score improved from 48.3 to 55.2 points. Flexion improved from a mean of 106.7° preoperatively to 111.4° at 10 years. Patellofemoral pain was indicated by 66 % of the patients before surgery and 4 % at the latest follow-up. 96 % were satisfied with the result of the surgery at 10 years. Radiographic evaluation was performed on 224 patients at the time of the latest follow-up. 203 patients (91 %) had normal radiographic findings, 21 patients (9 %) showed pathological findings. Radiolucencies were seen in 18 patients on the AP view of the tibia, 1 patient had an additional femoral radiolucency. There was an osteolysis located in the lateral tibia seen in 1 patient and an occurrence of heterotopic ossification in another patient. One knee showed a patella subluxation. No patient had radiographic evidence of loosening. 17 knees had required revision surgery with exchange of at least one of the components up to 10 years after the index procedure. 5 of the patients had revision for a deep infection, 2 for periprosthetic fractures of the distal femur with loosening of the prosthesis, 1 for fracture of the proximal tibia due to osteoporosis, 4 for aseptic loosening, 3 for instability and 2 for severe pain. Kaplan-Meier survival of all components using revision for any reason as the end point was 97.8 % at 10 years. CONCLUSION The good clinical and radiological long-term results as well as the satisfactory survival rate after total knee replacement with the NexGen CR® prosthesis are comparable with the results of other long-term studies using the NexGen CR® and assimilable prosthesis. Our results demonstrate that quality of life was improved by the implantation of the NexGen CR® prosthesis even a long time after the index procedure despite old age and comorbidity of the patients.
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Affiliation(s)
- J Hack
- Vitos Orthopädische Klinik Kassel
| | - S Mai
- Vitos Orthopädische Klinik Kassel
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Simeonova A, Jahnke A, Jahnke L, Siebenlist K, Stieler F, Mai S, Boda-Heggemann J, Wenz F, Lohr F. Automatically Gated CBCT-Controlled Fast Breath-Hold SBRT Is Dosimetrically Robust and Facilitates Precision Treatments for Patients With Lung Cancer. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2537] [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: 10/24/2022]
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Zheng P, Liu J, Mai S, Yuan Y, Wang Y, Dai G. Regulation of signal transducer and activator of transcription 3 and apoptotic pathways by betaine attenuates isoproterenol-induced acute myocardial injury in rats. Hum Exp Toxicol 2014; 34:538-47. [PMID: 25080425 DOI: 10.1177/0960327114543936] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The present study was designed to investigate the cardioprotective effects of betaine on acute myocardial ischemia induced experimentally in rats focusing on regulation of signal transducer and activator of transcription 3 (STAT3) and apoptotic pathways as the potential mechanism underlying the drug effect. Male Sprague Dawley rats were treated with betaine (100, 200, and 400 mg/kg) orally for 40 days. Acute myocardial ischemic injury was induced in rats by subcutaneous injection of isoproterenol (85 mg/kg), for two consecutive days. Serum cardiac marker enzyme, histopathological variables and expression of protein levels were analyzed. Oral administration of betaine (200 and 400 mg/kg) significantly reduced the level of cardiac marker enzyme in the serum and prevented left ventricular remodeling. Western blot analysis showed that isoproterenol-induced phosphorylation of STAT3 was maintained or further enhanced by betaine treatment in myocardium. Furthermore, betaine (200 and 400 mg/kg) treatment increased the ventricular expression of Bcl-2 and reduced the level of Bax, therefore causing a significant increase in the ratio of Bcl-2/Bax. The protective role of betaine on myocardial damage was further confirmed by histopathological examination. In summary, our results showed that betaine pretreatment attenuated isoproterenol-induced acute myocardial ischemia via the regulation of STAT3 and apoptotic pathways.
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Affiliation(s)
- P Zheng
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Yinchuan, Ningxia, People's Republic of China
| | - J Liu
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Yinchuan, Ningxia, People's Republic of China
| | - S Mai
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Yinchuan, Ningxia, People's Republic of China
| | - Y Yuan
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Yinchuan, Ningxia, People's Republic of China
| | - Y Wang
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Yinchuan, Ningxia, People's Republic of China
| | - G Dai
- Department of Pharmaceutical Engineering, College of Chemical and Materials Engineering, Kaili University, Kaili, Guizhou, People's Republic of China
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Heckel M, Bussmann S, Mai S, Stiel S, Weber M, Ostgathe C. Validierung des Fragebogens ‚Quality of Dying and Death‘ (QoDD) für Nahestehende von Palliativpatienten im deutschen Sprachraum. Palliativmedizin 2014. [DOI: 10.1055/s-0034-1374167] [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] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Knecht H, Kongruttanachok N, Sawan B, Brossard J, Prévost S, Turcotte É, Lichtensztejn Z, Lichtensztejn D, Mai S. 3d Telomere Signatures of Hodgkin-Cells at Diagnosis Identify Patients with Poor Response to Conventional Chemotherapy. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)33670-x] [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: 11/26/2022] Open
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Dawson AJ, Yanofsky R, Vallente R, Bal S, Schroedter I, Liang L, Mai S. Array comparative genomic hybridization and cytogenetic analysis in pediatric acute leukemias. ACTA ACUST UNITED AC 2011; 18:e210-7. [PMID: 21980252 DOI: 10.3747/co.v18i5.770] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Most patients with acute lymphocytic leukemia (all) are reported to have acquired chromosomal abnormalities in their leukemic bone marrow cells. Many established chromosome rearrangements have been described, and their associations with specific clinical, biologic, and prognostic features are well defined. However, approximately 30% of pediatric and 50% of adult patients with all do not have cytogenetic abnormalities of clinical significance. Despite significant improvements in outcome for pediatric all, therapy fails in approximately 25% of patients, and these failures often occur unpredictably in patients with a favorable prognosis and "good" cytogenetics at diagnosis.It is well known that karyotype analysis in hematologic malignancies, although genome-wide, is limited because of altered cell kinetics (mitotic rate), a propensity of leukemic blasts to undergo apoptosis in culture, overgrowth by normal cells, and chromosomes of poor quality in the abnormal clone. Array comparative genomic hybridization (acgh-"microarray") has a greatly increased genomic resolution over classical cytogenetics. Cytogenetic microarray, which uses genomic dna, is a powerful tool in the analysis of unbalanced chromosome rearrangements, such as copy number gains and losses, and it is the method of choice when the mitotic index is low and the quality of metaphases is suboptimal. The copy number profile obtained by microarray is often called a "molecular karyotype."In the present study, microarray was applied to 9 retrospective cases of pediatric all either with initial high-risk features or with at least 1 relapse. The conventional karyotype was compared to the "molecular karyotype" to assess abnormalities as interpreted by classical cytogenetics. Not only were previously undetected chromosome losses and gains identified by microarray, but several karyotypes interpreted by classical cytogenetics were shown to be discordant with the microarray results. The complementary use of microarray and conventional cytogenetics would allow for more sensitive, comprehensive, and accurate analysis of the underlying genetic profile, with concomitant improvement in prognosis and treatment, not only for pediatric all, but for neoplastic disorders in general.
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Affiliation(s)
- A J Dawson
- Cytogenetics Laboratory, Diagnostic Services Manitoba, Winnipeg, MB
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Siebert WE, Mai S, Moroni A, Chiarello E, Giannini S. A two-year prospective and retrospective multi-center study of the TriboFit® Hip System. J Long Term Eff Med Implants 2010; 19:149-55. [PMID: 20666714 DOI: 10.1615/jlongtermeffmedimplants.v19.i2.60] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The first 50 cases using a polycarbonate-urethane acetabular component in the TriboFit® Hip System for human hip reconstruction were reviewed. The average follow-up for cases not revised or deceased prior to 24 months was 28.0 months. The clinical results were similar to those reported in the literature for the same indications and follow-up. Therefore, with 2 to 4 years follow-up, it can be concluded that the TriboFit® Hip System is as safe and effective for use as a hip replacement system in femoral neck fracture patients as traditional hemiarthroplasty systems, and in osteoarthritis patients as a total hip system made of traditional bearing materials.
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Mai S, Wei K, Flenniken A, Adamson SL, Rossant J, Aubin JE, Gong SG. The missense mutation W290R in Fgfr2 causes developmental defects from aberrant IIIb and IIIc signaling. Dev Dyn 2010; 239:1888-900. [DOI: 10.1002/dvdy.22314] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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Abstract
Continuous etching of aggressive all-in-one adhesives occurs in wet dentin tubules after polymerization of the adhesives. This study challenged the hypothesis that unpolymerized acidic monomers from an aggressive all-in-one self-etching adhesive continue to etch beyond dentin hybrid layers. Dentin surfaces bonded with Adper Prompt L-Pop were sectioned into 0.3-mm-thick slabs. Some of the slabs were stored in water (pH 6.8) or glycine buffer (pH 11.1) for six weeks and then examined by CLSM, SEM, and TEM. The rest were immersed in a biomimetic remineralizing medium for up to 4 months. Morphologic analysis indicated no difference in demineralization thickness between the two 6-week storage groups. However, increased permeability and loss of integrity occurred along the base of the hybrid layers in the glycine buffer group, but not in the water storage group. These findings were also confirmed by the results of biomimetic remineralization along the bases of those hybrid layers.
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Affiliation(s)
- J Kim
- Department of Conservative Dentistry, School of Dentistry, KyungHee University, Seoul, Korea
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Abstract
Biomimetic remineralization is potentially useful for the remineralization of incompletely resin-infiltrated collagen matrices created by etch-and-rinse adhesives. In this study, we tested the hypothesis that structurally altered dentin collagen cannot be remineralized to the same hierarchical order and dimension seen in structurally intact dentin collagen. The remineralization medium consisted of a set Portland cement/simulated body fluid system containing polycarboxylic acid and polyvinylphosphonic acid as biomimetic analogs. Remineralization of air-dried, collapsed hybrid layers was apparent after one month, with hybrid layers remineralized to 80-90% of their thickness after 2-4 months. A hypermineralized layer was seen on the hybrid layer surface, and tubular orifices were occluded with apatite deposits that resembled those present in non-carious cervical dentin. Structurally altered collagen is unlikely to be remineralized to the same hierarchical order and dimension as seen in intact dentin. The aggressively air-dried acid-etched dentin remineralization model also sheds light on the mechanism of sclerotic dentin formation.
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Affiliation(s)
- S Mai
- Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou, China
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Vlyssides A, Barampouti EM, Mai S, Stamatoglou A, Tsimas E. Alternative biological systems for the treatment of vinasse from wine. Water Sci Technol 2010; 62:2899-2904. [PMID: 21123920 DOI: 10.2166/wst.2010.647] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This work studied alternative treatment schemes for the vinasse wastewater from wine distilleries aiming at overcoming the problems caused by the high nitrogen and sulfur concentrations. A plexiglas laboratory-scale upflow anaerobic sludge blanket (UASB) reactor of 20 L volume that was operated at 45°C and hydraulic retention time 1 d, was included in all the examined systems. System 1 was the conventional UASB reactor, system 2 was the UASB reactor supplemented with iron. System 3 consisted of the UASB reactor supplemented with iron and a CSTR reactor that operated under the following conditions: Diluted Oxygen 1.2 mg/L, Hydraulic Retention Time 1 d, pH 6.7 and Temperature 45°C. System 3 aimed at converting ammonium directly to dinitrogen gas under anaerobic conditions but it needed to be preceeded by a first partial nitrification step. All systems had high COD efficiencies over 75%. Ferrous iron addition apart from enhancing the performance of systems 2 and 3, it was able to retain all sulphur content of the wastewater as ferrous sulfide stripping the biogas from hydrogen sulfide. System 3 also managed to meet its goal, since it achieved an 86% nitrogen reduction. Conclusively, system 3 seems to be a very promising environmental technology for the treatment of distillery and winery byproducts, as well as industrial wastewater with high sulfur and nitrogen content.
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Affiliation(s)
- A Vlyssides
- Chemical Engineering Department, National Technical University of Athens, Zographou 157 00, Athens, Greece.
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Kim P, Liu X, Liu L, Lee T, Barham R, Harvie G, Mai S, Ybarrondo B, Singh S. Therapeutic Implications of Detection of Amplification and Activation of HER2 and Other Receptor Tyrosine Kinases (RTKs) in Circulating Tumor Cells (CTCs) in Recurrent Breast Cancer. Cancer Res 2009. [DOI: 10.1158/0008-5472.sabcs-09-3010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: HER2 is one of four trans-membrane RTKs in epidermal growth factor receptor family, and HER2-positive phenotype has been associated with aggressive subtype of breast cancer with HER2 gene amplification. Approximately 15-20% of breast cancers are considered HER2-positive by IHC or FISH analysis. Recently, changes in HER2 expression status between primary tumor and CTCs found in recurrent metastatic disease have been reported to occur at a significant frequency. Methods for detecting HER2 expression and phosphorylation in serially collected CTCs may provide valuable insight into the overall disease profile shift, and therefore lead to better selection of therapy for each patient.Methods: A triple-antibody-enzyme-channeling multiplexed protein microarray platform has been developed to detect the phosphorylation on target molecules. Extremely high assay specificity was achieved by immuno-complex formation via co-localization of two detector enzyme-conjugated-antibodies once target proteins are captured on the microarray-surface. The channeling events between two detector enzymes in proximity enabled profiling of the RTKs with a single-cell level sensitivity. In order to validate the method on clinical samples, CTCs from 77 breast cancer patients on different therapy regimens were analyzed at various time points along their course of therapy.Results: Whole blood of 77 metastatic cancer patients and 60 healthy volunteers were analyzed for CTC-HER2 expression and activation. We observed significant HER2 status conversion with recurrent disease. 29% of patients with negative HER2 expression in the primary tumor showed HER2-amplification in isolated CTCs. Phosphorylated HER2 receptors were found in 52% of patients with primary HER2 negative disease. The enhancement of assay sensitivity and specificity using proximity mediated immuno-assay made the detection of HER2 activation (even without amplification) possible when isolated CTCs were stimulated with ligands to other RTKs with transactivation potential.Discussion: The multiplexed-proximity mediated immunoassay successfully detected the expression of HER2 RTKs and their degree of activation in CTCs isolated from recurrent breast cancer patients. As we hypothesize that CTCs found in metastatic stage represent the most aggressive and invasive cell population, serial CTC-profiling can lead to better therapy selection/adjustment and disease/treatment monitoring as there are available options to choose appropriate kinase inhibitors for RTK-targeted therapies. While significant number of patients acquired HER2-amplification in their CTCs, substantially higher rate of CTC-HER2 activation was found in relapsed metastatic disease. The unique triple-antibody mediated immuno-microarray analysis allowed a single cell level profiling of the CTC-HER2. The ability to profile serially collected CTCs will provide valuable information on changes occurring in tumor cells as a function of time and treatment. This method can provide guidance, not only for initial selection of targeted therapeutics, but also in subsequent monitoring for rapidly 'evolving' disease in individual patient.
Citation Information: Cancer Res 2009;69(24 Suppl):Abstract nr 3010.
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Affiliation(s)
- P. Kim
- 1Prometheus Laboratories, CA,
| | - X. Liu
- 1Prometheus Laboratories, CA,
| | - L. Liu
- 1Prometheus Laboratories, CA,
| | - T. Lee
- 1Prometheus Laboratories, CA,
| | | | | | - S. Mai
- 1Prometheus Laboratories, CA,
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Lacoste S, Wiechec E, Dos Santos Silva AG, Guffei A, Williams G, Lowbeer M, Benedek K, Henriksson M, Klein G, Mai S. Chromosomal rearrangements after ex vivo Epstein-Barr virus (EBV) infection of human B cells. Oncogene 2009; 29:503-15. [PMID: 19881539 DOI: 10.1038/onc.2009.359] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [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
The Epstein-Barr virus (EBV) is carried by more than 90% of the adult world population and has been implicated in several human malignancies. Its ability to induce unlimited in vitro proliferation of B cells is frequently used to generate lymphoblastoid cell lines (LCLs). In this study, we have investigated the evolution of two LCLs up to 25 weeks after EBV infection. LCLs were karyotyped once a month by spectral karyotyping (SKY). LCLs but not mitogen-activated B cells showed evidence of DNA damage and DNA damage response within the first 2 weeks. After 4 weeks, the former, but not the latter, showed a high level of non-clonal structural aberrations, mainly deletions, fragments, dicentric chromosomes and unbalanced translocations. Genomic instability decreased thereafter over time. Nonrandom aneuploidy 12 weeks after infection showed clonal evolution in culture. After 25 weeks post-infection, most cells exhibited karyotypic stability. Chromosomal aberrations were compatible with telomere dysfunction, although in the absence of telomere shortening. The telomere capping protein TRF2 was partially displaced from telomeres in EBV-infected cells, suggesting an EBV-mediated uncapping problem. In conclusion, this study suggests that DNA damage and telomere dysfunction contribute to EBV-related chromosomal instability in early LCLs.
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Affiliation(s)
- S Lacoste
- Department of Physiology, Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, Manitoba, Canada R3E 0V9
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Vlyssides A, Mai S, Barampouti EM. An integrated mathematical model for co-composting of agricultural solid wastes with industrial wastewater. Bioresour Technol 2009; 100:4797-4806. [PMID: 19481446 DOI: 10.1016/j.biortech.2009.05.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2009] [Revised: 05/05/2009] [Accepted: 05/05/2009] [Indexed: 05/27/2023]
Abstract
An integrated model for the composting process was developed. The structure of the model is such that it can be implemented in any mixture of different substrates, even in the case of co-composting of a solid waste with industrial wastewater. This paper presents a mathematical formulation of the physicochemical and biological principles that govern the composting process. The model of the co-composting ecosystem included mass transfer, heat transfer and biological processes. The biological processes included in the model were hydrolysis of particulate substrates, microbial growth and death. Two microbial populations (bacteria and fungi) were selected using Monod kinetics. Growth limiting functions of inhibitory factors, moisture and dissolved oxygen were added in the Monod kinetics. The bacteria were considered to utilise the easy biodegradable carbon hydrolysis product, fungi the difficult one, while both could degrade the carbon of wastewater. The mass balances of the most important nutrients, nitrogen and phosphorous, were also included in this approach. Model computer simulations provided results that fitted satisfactory the experimental data. Conclusively, the model could be a useful tool for the prediction of the co-composting process performance in the future and could be used to assist in the operation of co-composting plants.
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Affiliation(s)
- A Vlyssides
- National Technical University of Athens, School of Chemical Engineering, 9 Heroon Polytechniou St., Zografou, Athens, Greece.
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Bronstein I, Israel Y, Kepten E, Mai S, Shav-Tal Y, Barkai E, Garini Y. Transient anomalous diffusion of telomeres in the nucleus of mammalian cells. Phys Rev Lett 2009; 103:018102. [PMID: 19659180 DOI: 10.1103/physrevlett.103.018102] [Citation(s) in RCA: 266] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2009] [Indexed: 05/28/2023]
Abstract
We measured individual trajectories of fluorescently labeled telomeres in the nucleus of eukaryotic cells in the time range of 10(-2)-10(4)sec by combining a few acquisition methods. At short times the motion is subdiffusive with r2 approximately talpha and it changes to normal diffusion at longer times. The short times diffusion may be explained by the reptation model and the transient diffusion is consistent with a model of telomeres that are subject to a local binding mechanism with a wide but finite distribution of waiting times. These findings have important biological implications with respect to the genome organization in the nucleus.
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Affiliation(s)
- I Bronstein
- Physics Department & Institute for Nanotechnology, Bar-Ilan University, Ramat-Gan 52900, Israel
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Brackett MG, Tay FR, Brackett WW, Dib A, Dipp FA, Mai S, Pashley DH. In Vivo Chlorhexidine Stabilization of Hybrid Layers of an Acetone-based Dentin Adhesive. Oper Dent 2009; 34:379-83. [DOI: 10.2341/08-103] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Clinical Relevance
Extensive degradation of dentin hybrid layers formed with an acetone-based dentin adhesive beneath Class I resin composite restorations was evident after one year unless the teeth received an application of 2% chlorhexidine digluconate after etching.
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Huffman BP, Mai S, Pinna L, Weller RN, Primus CM, Gutmann JL, Pashley DH, Tay FR. Dislocation resistance of ProRoot Endo Sealer, a calcium silicate-based root canal sealer, from radicular dentine. Int Endod J 2009; 42:34-46. [PMID: 19125978 DOI: 10.1111/j.1365-2591.2008.01490.x] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIM To examine the dislocation resistance of three root canal sealers from radicular dentine with and without immersion in a simulated body fluid (SBF), using a modified push-out test design that produced simulated canal spaces of uniform dimensions under identical cleaning and shaping conditions. METHODOLOGY Sixty single-rooted caries-free human canine teeth were used. Standardized simulated canal spaces were created using 0.04 taper ProFile instruments along the coronal, middle and apical thirds of longitudinal tooth slabs. Following NaOCl/ethylenediamine tetra-acetic acid cleaning, the cavities were filled with ProRoot Endo Sealer, AH Plus Jet or Pulp Canal Sealer. After setting, half of the cavities were tested with a fibre-optic light-illuminated push-out testing device. The rest were immersed in SBF for 4 weeks before push-out evaluation. Failure modes were examined with stereomicroscopy and field emission (FE)-scanning electron microscopy. RESULTS Location of the sealer-filled cavities did not affect push-out strengths. ProRoot Endo Sealer exhibited higher push-out strengths than the other two sealers particularly after SBF storage (P < 0.001). Failure modes were predominantly adhesive and mixed for Pulp Canal Sealer and AH Plus Jet, and predominantly cohesive for ProRoot Endo Sealer. Spherical amorphous calcium phosphate-like phases that spontaneously transformed into apatite-like phases were seen in the fractured specimens of ProRoot Endo Sealer after SBF storage. CONCLUSIONS When tested in bulk without a main core, both 'sealer type' and 'SBF storage' were significant in affecting push-out results. The ProRoot Endo Sealer demonstrated the presence of spherical amorphous calcium phosphate-like phases and apatite-like phases (i.e. ex vivo bioactivity) after SBF storage.
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Affiliation(s)
- B P Huffman
- School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
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Weller RN, Tay KCY, Garrett LV, Mai S, Primus CM, Gutmann JL, Pashley DH, Tay FR. Microscopic appearance and apical seal of root canals filled with gutta-percha and ProRoot Endo Sealer after immersion in a phosphate-containing fluid. Int Endod J 2009; 41:977-86. [PMID: 19133087 DOI: 10.1111/j.1365-2591.2008.01462.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AIM To investigate the sealing quality of ProRoot Endo Sealer, a calcium silicate-based sealer and its morphologic characteristics after immersion in a phosphate-containing fluid (PCF). METHODOLOGY Single-rooted canals were filled with gutta-percha and either ProRoot Endo Sealer or two commercially available zinc oxide eugenol (ZOE)-based and epoxy resin-based sealers. The sealers were allowed to set for 6 days and the filled teeth were immersed in PCF for 24 h before fluid leakage evaluation. After initial leakage evaluation at the 7th day, each filled root was restored and reimmersed in PCF for 28 days before the second phase of leakage evaluation at 35 days. Cryofractured specimens of additional teeth filled with the three sealers were examined using scanning electron microscopy after immersion in PCF for the two periods. RESULTS One-way repeated measures anova and Tukey test revealed significant differences between the ZOE-based sealer at 35 days and the calcium silicate-based sealer at 35 days (P < 0.001), and between the ZOE-based sealer at 7 days and the calcium silicate-based sealer at 35 days (P = 0.001). No difference was found between the epoxy resin-based sealer and the calcium silicate-based sealer after both storage periods. Cryofractured calcium silicate-based sealer specimens demonstrated apatite-like crystalline deposits along the apical and middle thirds of the canal walls via transformation from amorphous calcium phosphate-like precursors. CONCLUSIONS ProRoot Endo Sealer is comparable in sealing quality to the epoxy resin-based sealer and seals better than the ZOE-based sealer after immersion in PCF. The calcium silicate-based sealer also demonstrates ex vivo bioactivity when it comes into contact with phosphate ions.
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Affiliation(s)
- R N Weller
- Department of Endodontics, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA
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Knecht H, Sawan B, Lichtensztejn D, Lemieux B, Wellinger RJ, Mai S. The 3D nuclear organization of telomeres marks the transition from Hodgkin to Reed-Sternberg cells. Leukemia 2008; 23:565-73. [PMID: 19039323 DOI: 10.1038/leu.2008.314] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
To get an insight into the transition from mononuclear Hodgkin cells (H cells) to diagnostic multinuclear Reed-Sternberg cells (RS cells), we performed an analysis of the three-dimensional (3D) structure of the telomeres in the nuclei of the Hodgkin cell lines HDLM-2, L-428, L-1236 and lymph node biopsies of patients with Hodgkin's disease. Cellular localization of key proteins of the telomere-localized shelterin complex, the mitotic spindle and double-stranded DNA breaks was also analyzed. RS cells show significantly shorter and significantly fewer telomeres in relation to the total nuclear volume when compared with H cells; in particular, telomere-poor 'ghost' nuclei are often adjacent to one or two nuclei displaying huge telomeric aggregates. Shelterin proteins are mainly cytoplasmic in both H and RS cells, whereas double-stranded DNA breaks accumulate in the nuclei of RS cells. In RS cells, multipolar spindles prevent proper chromosome segregation. In conclusion, a process of nuclear disorganization seems to initiate in H cells and further progresses when the cells turn into RS cells and become end-stage tumor cells, unable to divide further because of telomere loss, shortening and aggregate formation, extensive DNA damage and aberrant mitotic spindles that may no longer sustain chromosome segregation. Our findings allow a mechanistic 3D understanding of the transition of H to RS cells.
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Affiliation(s)
- H Knecht
- Département de Médicine, CHUS, Université de Sherbrooke, Sherbrooke, Québec, Canada.
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Ihle M, Mai S, Pfluger D, Siebert W. The results of the titanium-coated RM acetabular component at 20 years: a long-term follow-up of an uncemented primary total hip replacement. ACTA ACUST UNITED AC 2008; 90:1284-90. [PMID: 18827236 DOI: 10.1302/0301-620x.90b10.20274] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In a prospective study, 93 unselected consecutive uncemented hip arthroplasties were performed in 80 patients using the titanium-coated RM acetabular component and the CLS femoral component. The mean age of the patients at operation was 52 years (28 to 81). None were lost to follow-up. In the 23 patients who had died (26 hips) only one acetabular component had been revised. In the 57 living patients (67 hips), 13 such revisions had been performed. Of the 14 revisions, seven were for osteolysis, five for loosening and two for infection. Survival analysis of this implant showed a total probability of survival of 83% (95% confidence interval 73 to 90), with all revisions as the endpoint, and a probability of 94% (95% confidence interval 87 to 98) with revision for aseptic loosening as the endpoint, indicating reliable long-term fixation of the titanium-coated RM acetabular component.
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Affiliation(s)
- M Ihle
- Orthopädische Klinik Kassel, Wilhelmshöher Allee 345, D-34131 Kassel, Germany
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Stieler F, Wolff D, Lohr F, Steil V, Abo-Madyan Y, Wenz F, Mai S. Conformal Anal Cancer Pelvis Radiotherapy Treatment with VMAT. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.089] [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: 10/21/2022]
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Wolff D, Stieler F, Abo-Madyan Y, Polednik M, Steil V, Mai S, Wenz F, Lohr F. Volumetric Intensity Modulated Arc Therapy (VMAT) vs. Serial Tomotherapy and Segmental (Step and Shoot) IMRT for Treatment of Prostate Cancer. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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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Chiaraputt S, Mai S, Huffman BP, Kapur R, Agee KA, Yiu CKY, Chan DCN, Harnirattisai C, Arola DD, Rueggeberg FA, Pashley DH, Tay FR. Changes in resin-infiltrated dentin stiffness after water storage. J Dent Res 2008; 87:655-60. [PMID: 18573986 DOI: 10.1177/154405910808700704] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Plasticization of polymers by water sorption lowers their mechanical properties in a manner that is predictable by the polarity of their component resins. This study tested the hypothesis that when adhesive resins were used to create resin-infiltrated dentin, the reductions in their flexural moduli after water storage would be lowered proportional to their hydrophilic characteristics. Three increasingly hydrophilic resin blends were used to fabricate polymer beams and macro-hybrid layer models of resin-infiltrated dentin for testing with a miniature three-point flexure device, before and after 1-4 weeks of water storage. Flexural modulus reductions in macro-hybrid layers were related to, and more extensive than, reductions in the corresponding polymer beams. Macro-hybrid layers that were more hydrophilic exhibited higher percent reductions in flexural modulus, with the rate of reduction proportional to the Hoy's solubility parameters for total intermolecular attraction forces (delta(t)) and polar forces (delta(p)) of the macro-hybrid layers.
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Affiliation(s)
- S Chiaraputt
- Faculty of Dentistry, Srinakharinwirot University, Thailand
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Wolff D, Stieler F, Polednik M, Abo-Madyan Y, Mai S, Steil V, Wenz F, Lohr F. SU-GG-T-531: Comparison of Volumetric Modulated Arc Therapy (VMAT) with Serial Tomotherapy and Segmental (step and Shoot) IMRT for Boost Treatment of Prostate Cancer. Med Phys 2008. [DOI: 10.1118/1.2962280] [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: 11/07/2022] Open
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Stieler F, Lohr F, Wolff D, Steil V, Abo-Madyan Y, Wenz F, Mai S. SU-GG-T-551: VMAT Compared to 3D-RT and Step and Shoot IMRT for Anal Cancer Pelvis Treatment. Med Phys 2008. [DOI: 10.1118/1.2962300] [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: 11/07/2022] Open
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Zakharenko LP, Perepelkina MP, Mai S. [Three-dimensional organization of telomeres in the Drosophila melanogaster salivary glands nuclei]. Tsitologiia 2008; 50:585-589. [PMID: 18771173] [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: 05/26/2023]
Abstract
The 3D-FISH was employed to investigate the telomere topology in polytene nuclei of salivary glands of Drosophila melanogaster. The majorities of telomeres in polytene nuclei of salivary glands in Drosophila strain y(2-717) are localized in the nuclear central area and have no contacts with nuclear membrane. In females of this strain, ectopic contacts between telomeres occur at 25 % higher frequency than in males. HeT-A DNA in y(2-717alk3-2) strain, which is a derivative of y(2-717) carrying an inversion between 1D and 13C bands, is found in region 13 of X chromosome. The frequency of ectopic contacts of telomeres in y(2-717alk3-2) males is 10 % higher than that in y(2-717) strain. The number of ectopic contacts can be significantly different in independent experiments, possibly indicating the role of random factors in the contact formation.
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Boda-Heggemann J, Köhler F, Wertz H, Mennemeyer P, Löb I, Mai S, Hesser J, Lohr F, Wenz F. Accuracy of Stereotactic Ultrasound (BAT®) for Prostate Repositioning–A 3D On-Line Fiducial Based Assessment With Cone-Beam CT. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.2132] [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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Wertz H, Lohr F, Dobler B, Mai S, Welzel G, Boda-Heggemann J, Wenz F. Dosimetric consequences of a translational isocenter correction based on image guidance for intensity modulated radiotherapy (IMRT) of the prostate. Phys Med Biol 2007; 52:5655-65. [PMID: 17804887 DOI: 10.1088/0031-9155/52/18/012] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [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: 11/11/2022]
Abstract
Interfractional prostate motion during radiotherapy can have deleterious clinical consequences. It has become clinical practice to re-position the patient according to ultrasound or other imaging techniques. We investigated the dosimetric consequences of the linear translational position correction (isocenter correction) when a conformal IMRT technique with nine fields was used. Treatment plans of seven patients with empty and distended rectums were analyzed. The reference plans were calculated on the CT with an empty rectum. The treatment plans were transferred to a second CT with a distended rectum for an uncorrected setup of the patient referenced to bony anatomy and a corrected setup after translational position correction of the isocenter. The dosimetric consequences (with and without correction) were analyzed. For single treatment fractions, organ motion decreased the volume of the prostate encompassed by the 95% isodose (V95%) by up to -24%-p (percentage points). The mean rectum dose increased by up to 41%-p. Linear translational correction increased V95% of the prostate by up to 17%-p while the mean rectum dose was reduced by up to -23%-p compared to the uncorrected setup. Linear translational correction can improve radiation treatment accuracy for prostate cancer if geometrical changes are within certain limits.
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Affiliation(s)
- H Wertz
- Department of Radiation Oncology, Mannheim Medical Center, University of Heidelberg, 68167 Mannheim, Germany.
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Zakharenko LP, Kovalenko LV, Mai S. Fluorescence in situ hybridization analysis of hobo, mdg1 and Dm412 transposable elements reveals genomic instability following the Drosophila melanogaster genome sequencing. Heredity (Edinb) 2007; 99:525-30. [PMID: 17622267 DOI: 10.1038/sj.hdy.6801029] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [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] Open
Abstract
The genome of Drosophila melanogaster strain y cn bw sp has been sequenced and the transposable elements insertion sites have been determined. We hybridized fluorescence-labeled probes directed to the hobo transposon, Dm412 and mdg1 retrotransposons to polytene chromosomes and compared the observed sites to those published in the annotated genome sequence. We observed an almost twofold increase in the number of hobo hybridization sites (46 found as compared to 24 annotated sites). There was no evidence that the hobo transposition rate is slowing over the 10-year period. The patterns of Dm412 and mdg1 sites have changed less dramatically since the time of genome sequencing. Three novel Dm412 hybridization sites were detected while 4 out of 30 annotated sites were missing. Only one additional mdg1 site was found, while 1 out of 29 annotated sites has been lost.
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Affiliation(s)
- L P Zakharenko
- Siberian Department, Institute of Cytology and Genetics of the Russian Academy of Sciences, Novosibirsk, Russia.
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