239 research outputs found

    Detection of prostate specific ETS fusion transcripts in cancer samples

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    Aim. To detect ETS fusion transcripts in Ukrainian population and to analyze a possible relationship between the ETS fusion transcripts and clinical characteristics of prostate cancer. Methods. Quantitative PCR (q-PCR) was used to analyze the expression of six fusion transcripts at the mRNA level. The amplified products were analyzed by gel electrophoresis and direct sequencing. We analyzed 37 fresh frozen samples of prostate cancer tissues, 37 paired conventionally normal prostate tissue samples and 20 samples of adenomas. Results. Six ETS fusion transcripts of TMPRSS2 with ERG, ETV1, ETV4, ETV5 were analyzed. Only one out of six fusion ETS transcripts was detected in a cohort of 37 Ukrainian patients with prostate adenocarcinoma. The frequency of detection of the TMPRSS2-ERG fusion transcript in prostate cancer tissues was 56.8 %. The TMPRSS2-ERG expression was also detected in 16 normal prostate tissue samples (43.2 %) and in 4 prostate adenoma samples (20 %). No correlation was found between the frequency of the TMPRSS2-ERG in carcinoma samples and clinical characteristics of the samples. However, an analysis of relative gene expression in all the investigated groups has shown the altered TMPRSS2-ERG expression in some groups with different Gleason scores of prostate adenocarcinoma compared to adenomas and normal tissue samples. The most elevatedTMPRSS2-ERG expression was found in the prostate adenocarcinoma group with the Gleason score > 7. Conclusions. We detected the TMPRSS2-ERG fusion transcript (EF194202.1) in prostate tumor samples as adenocarcinoma (the frequency was 56.8 %) with different Gleason score and some paired normal prostate tissues as adenoma samples in our group of Ukrainian population. The obtained results show that the TMPRSS2-ERG fusion transcript is present at early stages of cancer development. In the further studies we plan to test whether the TMPRSS2-ERG fusion transcript can be used as a diagnostic marker of prostate cancer development.Мета. Виявити типи злитих транскриптів в українській популяції та проаналізувати можливий зв›язок між наявніс-тю злитих транскриптів ETS та клінічними характеристиками раку передміхурової залози. Методи. Кількісний ПЛР (q-PCR) використовували для аналізу експресії 6 злитих транскриптів на рівні мРНК. Ампліфіковані продукти перевіряли за допомогою гель-електрофорезу та секвенуванням. Нами було проаналізовано 37 свіжо заморожених зразків тканин раку передміхурової залози, 37 парних до них умовно нормальних зразків тканини передміху-рової залози та 20 зразків аденоми. Результати. Нами було проаналізовано 6 злитих транскриптів ETS: злиття TMPRSS2 з ERG, ETV1, ETV4, ETV5. У вибірці із 37 пацієнтів з аденокарциномою передміхурової залози було виявлено лише один з шести злитих транскриптів. Частота детекції злитого транскрипту TMPRSS2-ERG в тканинах раку передміхурової залози становила 56,8 %. Експресія TMPRSS2-ERGтакож була виявлена у 16 зразках умовно нормальних тканин передміхурової залози (43,2 %) та у 4 зразках аденоми передміхурової залози (20 %). Не було виявлено кореляції між частотою TMPRSS2-ERG та клінічними характеристиками пухлин у зразках карцином. Проте аналіз відносної експресії генів у всіх досліджених групах показав змінену експресію TMPRSS2-ERG у деяких групах з різними показниками ступеня Глісона в зразках аденокарцином порівняно з аденомами та зразками умовно нормальних тканин. Найбільш висока експресія TMPRSS2-ERG була виявлена в групі аденокарцином передміхурової залози з оцінками ступеня Глісона > 7. Висновки. У нашій досліджуваній групі населення України нами було детектовано злитий транскрипт TMPRSS2-ERG (EF194202.1) у пухлинних зразках передміхурової зало-зи як аденокарцином (частота 56,8 %) з різним ступенем Глісона та парним до них умовно нормальних тканинах передміхурової залози, так і в зразках аденом. Отримані результати показують, що злитий транскрипт TMPRSS2-ERG присутній вже на ранніх стадіях розвитку ракового захворювання. У подальших дослідженнях ми плануємо перевірити, чи може злитий транскрипт TMPRSS2-ERG бути використаний як діагностичний маркер утворення злитих транскриптів та можливого розвиток раку передміхурової залози.Цель. Выявить типы слитых транскриптов в украинской популяции и проанализировать возможную связь между наличием слитых транскриптов ETS и клиническими характеристиками рака простаты. Методы. Количественный ПЦР (q-PCR) использовали для анализа экспрессии 6 слитых транскриптов на уровне мРНК. Амплифицированные продукты проверяли с помощью гель-электрофореза и секвенированием. Нами были проанализированы 37 свежо замороженных образцов тканей рака простаты, 37 парных к ним условно нормальных образцов ткани простаты и 20 образцов аденомы. Результаты. Нами были проанализированы 6 слитых транскриптов ETS: слияние TMPRSS2 с ERG, ETV1, ETV4, ETV5. В выборке из 37 пациентов с аденокарциномой простаты было выявлено лишь один из шести слитых транскриптов. Частота детекции слитного транскрипта TMPRSS2-ERG в тканях рака простаты составляла 56,8 %. Экспрессия TMPRSS2-ERG также была обнаружена в 16 образцах условно нормальных тканей простаты (43,2 %) и в 4 образцах аденомы простаты (20 %). Не было обнаружено корреляции между частотой TMPRSS2-ERG и клиническими характеристиками опухолей в образцах карцином. Однако анализ относительной экспрессии генов во всех исследованных группах показал измененную экспрессию TMPRSS2-ERG в некоторых группах с различными показателями степени Глисона в образцах аденокарцином по сравнению с аденомы и образцами условно нормальных тканей. Наиболее высокая экспрессия TMPRSS2-ERG была обнаружена в группе аденокарцином простаты по оценкам степени Глисона > 7. Выводы. В нашей исследуемой группе населения Украины нами было детектируемого слитый транскрипт TMPRSS2-ERG (EF194202.1) в опухолевых образцах простаты как аденокарцином (частота 56,8 %) с разной степенью Глисона и парным к ним условно нормальных тканях простаты, так и в образцах аденом. Полученные результаты показывают, что слитый транскрипт TMPRSS2-ERG присутствует уже на ранних стадиях развития ракового заболевания. В дальнейших исследованиях мы планируем проверить, может ли слитый транскрипт TMPRSS2-ERG быть использован как диагностический маркер образования слитых транскриптов и возможного развитие рака простаты

    Search for composite and exotic fermions at LEP 2

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    A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminosity of about 48 pb^{-1} at an e^+e^- centre-of-mass energy of 183 GeV and about 20 pb^{-1} equally shared between the centre-of-mass energies of 172 GeV and 161 GeV. The search for pair-produced new leptons establishes 95% confidence level mass limits in the region between 70 GeV/c^2 and 90 GeV/c^2, depending on the channel. The search for singly produced excited leptons and quarks establishes upper limits on the ratio of the coupling of the excited fermio

    Search for lightest neutralino and stau pair production in light gravitino scenarios with stau NLSP

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    Promptly decaying lightest neutralinos and long-lived staus are searched for in the context of light gravitino scenarios. It is assumed that the stau is the next to lightest supersymmetric particle (NLSP) and that the lightest neutralino is the next to NLSP (NNLSP). Data collected with the Delphi detector at centre-of-mass energies from 161 to 183 \GeV are analysed. No evidence of the production of these particles is found. Hence, lower mass limits for both kinds of particles are set at 95% C.L.. The mass of gaugino-like neutralinos is found to be greater than 71.5 GeV/c^2. In the search for long-lived stau, masses less than 70.0 to 77.5 \GeVcc are excluded for gravitino masses from 10 to 150 \eVcc . Combining this search with the searches for stable heavy leptons and Minimal Supersymmetric Standard Model staus a lower limit of 68.5 \GeVcc may be set for the stau mas

    Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

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    A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

    Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

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    Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

    Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment

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    This paper describes an analysis of the angular distribution of W->enu and W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and the missing transverse energy, the W decay angular distribution projected onto the transverse plane is obtained and analysed in terms of helicity fractions f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw > 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour, are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017 +/- 0.030, where the first uncertainties are statistical, and the second include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables, revised author list, matches European Journal of Physics C versio

    Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

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    The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.Comment: 5 pages plus author list (18 pages total), 2 figures, 1 table, corrected author list, matches final version in Physical Review Letter

    Search for displaced vertices arising from decays of new heavy particles in 7 TeV pp collisions at ATLAS

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    We present the results of a search for new, heavy particles that decay at a significant distance from their production point into a final state containing charged hadrons in association with a high-momentum muon. The search is conducted in a pp-collision data sample with a center-of-mass energy of 7 TeV and an integrated luminosity of 33 pb^-1 collected in 2010 by the ATLAS detector operating at the Large Hadron Collider. Production of such particles is expected in various scenarios of physics beyond the standard model. We observe no signal and place limits on the production cross-section of supersymmetric particles in an R-parity-violating scenario as a function of the neutralino lifetime. Limits are presented for different squark and neutralino masses, enabling extension of the limits to a variety of other models.Comment: 8 pages plus author list (20 pages total), 8 figures, 1 table, final version to appear in Physics Letters

    Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt(s)= 7 TeV using 35 pb-1 of ATLAS data

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    A measurement of the differential cross-section for the inclusive production of isolated prompt photons in pp collisions at a center-of-mass energy sqrt(s) = 7 TeV is presented. The measurement covers the pseudorapidity ranges |eta|<1.37 and 1.52<=|eta|<2.37 in the transverse energy range 45<=E_T<400GeV. The results are based on an integrated luminosity of 35 pb-1, collected with the ATLAS detector at the LHC. The yields of the signal photons are measured using a data-driven technique, based on the observed distribution of the hadronic energy in a narrow cone around the photon candidate and the photon selection criteria. The results are compared with next-to-leading order perturbative QCD calculations and found to be in good agreement over four orders of magnitude in cross-section.Comment: 7 pages plus author list (18 pages total), 2 figures, 4 tables, final version published in Physics Letters

    Measurement of the production cross section of prompt j/psi mesons in association with a W (+/-) boson in pp collisions root s=7 TeV with the ATLAS detector

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    The process pp → W±J/ψ provides a powerful probe of the production mechanism of charmonium in hadronic collisions, and is also sensitive to multiple parton interactions in the colliding protons. Using the 2011 ATLAS dataset of 4.5 fb-1 of p s = 7TeV pp collisions at the LHC, the first observation is made of the production of W± + prompt J/ events in hadronic collisions, using W± → μ and J/ψ → μ+μ-. A yield of 27.4±7.5 -6.5 W± + prompt J/ψ events is observed, with a statistical significance of 5.1. The production rate as a ratio to the inclusive W± boson production rate is measured, and the double parton scattering contribution to the cross section is estimated. Copyright CERN, for the benefit of the ATLAS Collaboration
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