Infrecuente presentación clinicopatológica del daño tubular agudo por cadenas livianas en el mieloma multiple

El mieloma múltiple (MM) es la segunda neoplasia hematológica más común. Reportamos un caso de tubulopatía por cristales en un contexto de proteinuria de rango nefrótico. Este es el segundo caso reportado de tubulopatía en el mieloma múltiple sin síndrome de Fanconi.</p

Infrequent clinicopathological presentation of acute tubular damage by light Chains in multiple myeloma

2 p.Fil: Faure, Erika E. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.Fil: Imahorn, Julieta. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.Fil: Saavedra, Natalia. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.Fil: Sesín, Ana María. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Hospital Nacional de Clínicas. Servicio de Nefrología; Argentina.Fil: Dionisio de Cabalier, María Elisa. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.Fil: Mukdsi, Jorge Humberto. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.El mieloma múltiple (MM) es la segunda neoplasia hematológica más común. Reportamos un caso de tubulopatía por cristales en un contexto de proteinuria de rango nefrótico. Este es el segundo caso reportado de tubulopatía en el mieloma múltiple sin síndrome de Fanconi.info:eu-repo/semantics/publishedVersionFil: Faure, Erika E. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.Fil: Imahorn, Julieta. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.Fil: Saavedra, Natalia. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.Fil: Sesín, Ana María. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Hospital Nacional de Clínicas. Servicio de Nefrología; Argentina.Fil: Dionisio de Cabalier, María Elisa. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.Fil: Mukdsi, Jorge Humberto. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Cátedra de Anatomía Patológica; Argentina.Patologí

Human SOD2 Modification by Dopamine Quinones Affects Enzymatic Activity by Promoting Its Aggregation: Possible Implications for Parkinson’s Disease

Mitochondrial dysfunction and oxidative stress are considered central in dopaminergic neurodegeneration in Parkinson’s disease (PD). Oxidative stress occurs when the endogenous antioxidant systems are overcome by the generation of reactive oxygen species (ROS). A plausible source of oxidative stress, which could account for the selective degeneration of dopaminergic neurons, is the redox chemistry of dopamine (DA) and leads to the formation of ROS and reactive dopamine-quinones (DAQs). Superoxide dismutase 2 (SOD2) is a mitochondrial enzyme that converts superoxide radicals to molecular oxygen and hydrogen peroxide, providing a first line of defense against ROS. We investigated the possible interplay between DA and SOD2 in the pathogenesis of PD using enzymatic essays, site-specific mutagenesis, and optical and high-field-cw-EPR spectroscopies. Using radioactive DA, we demonstrated that SOD2 is a target of DAQs. Exposure to micromolar DAQ concentrations induces a loss of up to 50% of SOD2 enzymatic activity in a dose-dependent manner, which is correlated to the concomitant formation of protein aggregates, while the coordination geometry of the active site appears unaffected by DAQ modifications. Our findings support a model in which DAQ-mediated SOD2 inactivation increases mitochondrial ROS production, suggesting a link between oxidative stress and mitochondrial dysfunction

Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at √s = 13 TeV

Abstract The parton-level top quark (t) forward-backward asymmetry and the anomalous chromoelectric (d̂ t) and chromomagnetic (μ̂ t) moments have been measured using LHC pp collisions at a center-of-mass energy of 13 TeV, collected in the CMS detector in a data sample corresponding to an integrated luminosity of 35.9 fb−1. The linearized variable AFB(1) is used to approximate the asymmetry. Candidate t t ¯ events decaying to a muon or electron and jets in final states with low and high Lorentz boosts are selected and reconstructed using a fit of the kinematic distributions of the decay products to those expected for t t ¯ final states. The values found for the parameters are AFB(1)=0.048−0.087+0.095(stat)−0.029+0.020(syst),μ̂t=−0.024−0.009+0.013(stat)−0.011+0.016(syst), and a limit is placed on the magnitude of | d̂ t| &lt; 0.03 at 95% confidence level. [Figure not available: see fulltext.

Measurement of t(t)over-bar normalised multi-differential cross sections in pp collisions at root s=13 TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

Peer reviewe

An embedding technique to determine ττ backgrounds in proton-proton collision data

An embedding technique is presented to estimate standard model tau tau backgrounds from data with minimal simulation input. In the data, the muons are removed from reconstructed mu mu events and replaced with simulated tau leptons with the same kinematic properties. In this way, a set of hybrid events is obtained that does not rely on simulation except for the decay of the tau leptons. The challenges in describing the underlying event or the production of associated jets in the simulation are avoided. The technique described in this paper was developed for CMS. Its validation and the inherent uncertainties are also discussed. The demonstration of the performance of the technique is based on a sample of proton-proton collisions collected by CMS in 2017 at root s = 13 TeV corresponding to an integrated luminosity of 41.5 fb(-1).Peer reviewe

Search for Physics beyond the Standard Model in Events with Overlapping Photons and Jets

Results are reported from a search for new particles that decay into a photon and two gluons, in events with jets. Novel jet substructure techniques are developed that allow photons to be identified in an environment densely populated with hadrons. The analyzed proton-proton collision data were collected by the CMS experiment at the LHC, in 2016 at root s = 13 TeV, and correspond to an integrated luminosity of 35.9 fb(-1). The spectra of total transverse hadronic energy of candidate events are examined for deviations from the standard model predictions. No statistically significant excess is observed over the expected background. The first cross section limits on new physics processes resulting in such events are set. The results are interpreted as upper limits on the rate of gluino pair production, utilizing a simplified stealth supersymmetry model. The excluded gluino masses extend up to 1.7 TeV, for a neutralino mass of 200 GeV and exceed previous mass constraints set by analyses targeting events with isolated photons.Peer reviewe

Measurement of b jet shapes in proton-proton collisions at root s=5.02 TeV

We present the first study of charged-hadron production associated with jets originating from b quarks in proton-proton collisions at a center-of-mass energy of 5.02 TeV. The data sample used in this study was collected with the CMS detector at the CERN LHC and corresponds to an integrated luminosity of 27.4 pb(-1). To characterize the jet substructure, the differential jet shapes, defined as the normalized transverse momentum distribution of charged hadrons as a function of angular distance from the jet axis, are measured for b jets. In addition to the jet shapes, the per-jet yields of charged particles associated with b jets are also quantified, again as a function of the angular distance with respect to the jet axis. Extracted jet shape and particle yield distributions for b jets are compared with results for inclusive jets, as well as with the predictions from the pythia and herwig++ event generators.Peer reviewe

Bose-Einstein correlations of charged hadrons in proton-proton collisions at s\sqrt s = 13 TeV

Bose-Einstein correlations of charged hadrons are measured over a broad multiplicity range, from a few particles up to about 250 reconstructed charged hadrons in proton-proton collisions at $\sqrt{s}$ = 13 TeV. The results are based on data collected using the CMS detector at the LHC during runs with a special low-pileup configuration. Three analysis techniques with different degrees of dependence on simulations are used to remove the non-Bose-Einstein background from the correlation functions. All three methods give consistent results. The measured lengths of homogeneity are studied as functions of particle multiplicity as well as average pair transverse momentum and mass. The results are compared with data from both CMS and ATLAS at $\sqrt{s}$ = 7 TeV, as well as with theoretical predictions.[graphic not available: see fulltext]Bose-Einstein correlations of charged hadrons are measured over a broad multiplicity range, from a few particles up to about 250 reconstructed charged hadrons in proton-proton collisions at $\sqrt{s} =$ 13 TeV. The results are based on data collected using the CMS detector at the LHC during runs with a special low-pileup configuration. Three analysis techniques with different degrees of dependence on simulations are used to remove the non-Bose-Einstein background from the correlation functions. All three methods give consistent results. The measured lengths of homogeneity are studied as functions of particle multiplicity as well as average pair transverse momentum and mass. The results are compared with data from both CMS and ATLAS at $\sqrt{s} =$ 7 TeV, as well as with theoretical predictions