Correlation between MMP-9 and extracellular cytokine HMGB1 in prediction of human ischemic stroke outcome

AbstractIschemic stroke (IS) outcome predictors include clinical features, biochemical parameters and some risk factors. The relations between two main players in the ischemic brain, MMPs and HMGB1, were estimated in the plasma of ischemic stroke patients stratified according to the Glasgow Outcome Scale and the Oxfordshire Community Stroke Project classification. IS patients exhibited higher plasma concentration of MMP-9 and the inflammatory cytokine HMGB1 compared with healthy controls. A full-blown correlation between MMP-9 activation and increased plasma MMP-9 concentration was observed in case of IS patients. A similar activity of MMP-2 and MMP-12 was characteristic of healthy volunteers and IS patients. In patients with ischemic stroke increased plasma levels of MMP-9 and HMGB1 are associated with a poor functional outcome and are significantly correlated with each other (P=0.0054). We suggest that diagnostic benefits will be obtained if plasma HMGB1 levels are measured for IS patients in addition to MMP-9

Poly(ester amide) microspheres are efficient vehicles for long-term intracerebral growth factor delivery and improve functional recovery after stroke

Growth factors promote plasticity in injured brain and improve impaired functions. For clinical application, efficient approaches for growth factor delivery into the brain are necessary. Poly(ester amide) (PEA)-derived microspheres (MS) could serve as vehicles due to their thermal and mechanical properties, biocompatibility and biodegradability. Vascular endothelial growth factor (VEGF) exerts both vascular and neuronal actions, making it suitable to stimulate post-stroke recovery. Here, PEA (composed of adipic acid, L-phenyl-alanine and 1,4-butanediol) MS were loaded with VEGF and injected intracerebrally in mice subjected to cortical stroke. Loaded MS provided sustained release of VEGF in vitro and, after injection, biologically active VEGF was released long-term, as evidenced by high VEGF immunoreactivity, increased VEGF tissue levels, and higher vessel density and more NG2+ cells in injured hemisphere of animals with VEGF-loaded as compared to non-loaded MS. Loaded MS gave rise to more rapid recovery of neurological score. Both loaded and non-loaded MS induced improvement in neurological score and adhesive removal test, probably due to anti-inflammatory action. In summary, grafted PEA MS can act as efficient vehicles, with anti-inflammatory action, for long-term delivery of growth factors into injured brain. Our data suggest PEA MS as a new tool for neurorestorative approaches with therapeutic potential

Stroke care indicators in the Republic of Moldova – the RES-Q registry

Introducere. Până la aderarea Moldovei in anul 2016 la platforma internațională RES-Q (Registry of Stroke Care Quality) - Registrul Calității Îngrijirii Accidentului Vascular Cerebral (AVC), nu au existat date privind indicatorii de calitate intraspitalicești ai ictusului. Scopul acestei lucrări a fost de a evalua calitatea asistenței medicale acordată pacienților cu AVC în Moldova în baza datelor registrului RES-Q. Material și metode. Au fost analizate datele tuturor pacienților cu ictus ischemic și hemoragic acut din registrul RES-Q din 15 spitale din Moldova. Datele au fost colectate timp de o lună pe an pe parcurs a 3 ani (2017-2019). Analiza datelor între spitale s-a realizat din considerentul accesului acestora la computer tomografia cerebrală. Adițional, datele din Moldova au fost comparate cu cele din trei țări ale proiectului ESO-EAST (European Stroke Organization Enhancing and Accelerating Stroke Treatment): România, Lituania și Georgia. Rezultate. Studiul a inclus un număr total de 1660 pacienți, cu vârsta medie de 68 ani (49% - bărbați). Moldova a înregistrat rezultate mai slabe la numărul de CT efectuate (81% [95% CI 79-84%]), la evaluarea disfagiei (29% [95% CI 27-32%]), efectuarea trombolizei intravenoase (3% [95% CI 2-4%]), administrarea de anticoagulante (44% [95% CI 39-49%]) și statine (42% [95% CI 39-45%]) la externare, la mortalitatea intraspitalicească prin AVC (17% [95% CI 15- 19%]). În interiorul Moldovei calitatea asistenței prin AVC s-a comparat reieșind din accesul la CT. Concluzii. Studiul nostru a identificat lacune serioase ale performanțelor asistenței intraspitalicești în ictus, cum ar fi lipsa scanărilor prin CT în multe spitale publice, absența unei rețele naționale centralizate în domeniul AVC, acces extrem de scăzut la tratamentul prin tromboliză și implementarea nesatisfăcătoare a tratamentului de profilaxie secundară a ictusului.Introduction. There were no data on in-hospital stroke care indicators until Moldova’s accession to the international Registry of Stroke Care Quality (RES-Q) platform in 2016. The aim of this paper was to assess the acute stroke care quality in Moldova based on the data of the RES-Q registry. Material and methods. We analyzed the data of all patients with acute ischemic and hemorrhagic stroke of the RES-Q from 15 Moldovan hospitals. Data were collected for one month each year, during a 3-year period (2017-2019). Data analysis was performed between hospitals according to their access to a brain CT facility for Moldovan participating hospitals. Additionally, Moldovan data were compared with other three ESO-EAST (European Stroke Organization Enhancing and Accelerating Stroke Treatment) project countries: Romania, Lithuania, and Georgia. Results. A total of 1660 patients were recruited in the study, mean age of 68 years (49% men). Moldova registered poorer results in number of brain CT performed (81% [95% CI 79-84%]), dysphagia screening (29% [95% CI 27-32%]), IV thrombolysis performed (3% [95% CI 2-4%]), administration of anticoagulants (44% [95% CI 39-49%]) and statins (42% [95% CI 39-45%]) at discharge, in-hospital stroke mortality (17% [95% CI 15- 19%]). Within Moldova the stroke care quality was driven by the access to CT scan. Conclusions. Our study highlighted some serious gaps of in-hospital stroke care performance in Moldova, such as the lack of CT scans in many public hospitals, the absence of a national stroke center network, extremely low accessibility of IV thrombolysis and unsatisfactory implementation of secondary stroke prevention treatment

Observation of associated near-side and away-side long-range correlations in √sNN=5.02 TeV proton-lead collisions with the ATLAS detector

Two-particle correlations in relative azimuthal angle (Δϕ) and pseudorapidity (Δη) are measured in √sNN=5.02  TeV p+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using approximately 1  μb-1 of data as a function of transverse momentum (pT) and the transverse energy (ΣETPb) summed over 3.1<η<4.9 in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range (2<|Δη|<5) “near-side” (Δϕ∼0) correlation that grows rapidly with increasing ΣETPb. A long-range “away-side” (Δϕ∼π) correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small ΣETPb, is found to match the near-side correlation in magnitude, shape (in Δη and Δϕ) and ΣETPb dependence. The resultant Δϕ correlation is approximately symmetric about π/2, and is consistent with a dominant cos⁡2Δϕ modulation for all ΣETPb ranges and particle pT

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

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

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

Measurements of fiducial and differential cross sections for Higgs boson production in the diphoton decay channel at s√=8 TeV with ATLAS

Measurements of fiducial and differential cross sections are presented for Higgs boson production in proton-proton collisions at a centre-of-mass energy of s√=8 TeV. The analysis is performed in the H → γγ decay channel using 20.3 fb−1 of data recorded by the ATLAS experiment at the CERN Large Hadron Collider. The signal is extracted using a fit to the diphoton invariant mass spectrum assuming that the width of the resonance is much smaller than the experimental resolution. The signal yields are corrected for the effects of detector inefficiency and resolution. The pp → H → γγ fiducial cross section is measured to be 43.2 ±9.4(stat.) − 2.9 + 3.2 (syst.) ±1.2(lumi)fb for a Higgs boson of mass 125.4GeV decaying to two isolated photons that have transverse momentum greater than 35% and 25% of the diphoton invariant mass and each with absolute pseudorapidity less than 2.37. Four additional fiducial cross sections and two cross-section limits are presented in phase space regions that test the theoretical modelling of different Higgs boson production mechanisms, or are sensitive to physics beyond the Standard Model. Differential cross sections are also presented, as a function of variables related to the diphoton kinematics and the jet activity produced in the Higgs boson events. The observed spectra are statistically limited but broadly in line with the theoretical expectations

Measurement of χ c1 and χ c2 production with s√ = 7 TeV pp collisions at ATLAS

The prompt and non-prompt production cross-sections for the χ c1 and χ c2 charmonium states are measured in pp collisions at s√ = 7 TeV with the ATLAS detector at the LHC using 4.5 fb−1 of integrated luminosity. The χ c states are reconstructed through the radiative decay χ c → J/ψγ (with J/ψ → μ + μ −) where photons are reconstructed from γ → e + e − conversions. The production rate of the χ c2 state relative to the χ c1 state is measured for prompt and non-prompt χ c as a function of J/ψ transverse momentum. The prompt χ c cross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χ c decays. The fractions of χ c1 and χ c2 produced in b-hadron decays are also measured