Dynamic changes in eIF4F-mRNA interactions revealed by global analyses of environmental stress responses

BACKGROUND: Translation factors eIF4E and eIF4G form eIF4F, which interacts with the messenger RNA (mRNA) 5' cap to promote ribosome recruitment and translation initiation. Variations in the association of eIF4F with individual mRNAs likely contribute to differences in translation initiation frequencies between mRNAs. As translation initiation is globally reprogrammed by environmental stresses, we were interested in determining whether eIF4F interactions with individual mRNAs are reprogrammed and how this may contribute to global environmental stress responses. RESULTS: Using a tagged-factor protein capture and RNA-sequencing (RNA-seq) approach, we have assessed how mRNA associations with eIF4E, eIF4G1 and eIF4G2 change globally in response to three defined stresses that each cause a rapid attenuation of protein synthesis: oxidative stress induced by hydrogen peroxide and nutrient stresses caused by amino acid or glucose withdrawal. We find that acute stress leads to dynamic and unexpected changes in eIF4F-mRNA interactions that are shared among each factor and across the stresses imposed. eIF4F-mRNA interactions stabilised by stress are predominantly associated with translational repression, while more actively initiating mRNAs become relatively depleted for eIF4F. Simultaneously, other mRNAs are insulated from these stress-induced changes in eIF4F association. CONCLUSION: Dynamic eIF4F-mRNA interaction changes are part of a coordinated early translational control response shared across environmental stresses. Our data are compatible with a model where multiple mRNA closed-loop complexes form with differing stability. Hence, unexpectedly, in the absence of other stabilising factors, rapid translation initiation on mRNAs correlates with less stable eIF4F interactions

Effects of hospital facilities on patient outcomes after cancer surgery: an international, prospective, observational study

Background Early death after cancer surgery is higher in low-income and middle-income countries (LMICs) compared with in high-income countries, yet the impact of facility characteristics on early postoperative outcomes is unknown. The aim of this study was to examine the association between hospital infrastructure, resource availability, and processes on early outcomes after cancer surgery worldwide.Methods A multimethods analysis was performed as part of the GlobalSurg 3 study-a multicentre, international, prospective cohort study of patients who had surgery for breast, colorectal, or gastric cancer. The primary outcomes were 30-day mortality and 30-day major complication rates. Potentially beneficial hospital facilities were identified by variable selection to select those associated with 30-day mortality. Adjusted outcomes were determined using generalised estimating equations to account for patient characteristics and country-income group, with population stratification by hospital.Findings Between April 1, 2018, and April 23, 2019, facility-level data were collected for 9685 patients across 238 hospitals in 66 countries (91 hospitals in 20 high-income countries; 57 hospitals in 19 upper-middle-income countries; and 90 hospitals in 27 low-income to lower-middle-income countries). The availability of five hospital facilities was inversely associated with mortality: ultrasound, CT scanner, critical care unit, opioid analgesia, and oncologist. After adjustment for case-mix and country income group, hospitals with three or fewer of these facilities (62 hospitals, 1294 patients) had higher mortality compared with those with four or five (adjusted odds ratio [OR] 3.85 [95% CI 2.58-5.75]; p<0.0001), with excess mortality predominantly explained by a limited capacity to rescue following the development of major complications (63.0% vs 82.7%; OR 0.35 [0.23-0.53]; p<0.0001). Across LMICs, improvements in hospital facilities would prevent one to three deaths for every 100 patients undergoing surgery for cancer.Interpretation Hospitals with higher levels of infrastructure and resources have better outcomes after cancer surgery, independent of country income. Without urgent strengthening of hospital infrastructure and resources, the reductions in cancer-associated mortality associated with improved access will not be realised

First-principles electronic structure of rare-earth arsenides

PACS. 71.20.-b Electron density of states and band structure of crystalline solids – 71.20.Eh Rare earth metals and alloys,

First-principle electronic structure of rare earth arsenides

The electronic properties of rare-earth arsenides have been calculated from first principles. Inthe calculations we have treated the rare-earth f electrons both as core-like and as valence-like electrons.We consider the changes in the energy bands and in the density of states near the Fermi level which arefound to be relevant, except for the case of LuAs, and discuss this in relation with the role played fromthe rare-earth 5d derived states. Moreover we show that the rare-earth 5d related bands are particularlysensitive to the variation of the lattice constant; change in the lattice constant of less than 1% leadsto a different behaviour with respect to the crossing of the rare-earth 5d derived bands and the As 4pderived bands along the-direction. This point is discussed in connection with the possibility of having asemimetal-semiconductor transition in the rare-earth arsenides

Intérêt du Télos dans l'évaluation de la laxité chronique antérieure du genou en pré- et en postopératoire

Le Télos est une technique de radiographie dynamique, mécanique, passive, comparative et reproductible, fixant sur un cliché le test de Lachman (cliché de Lachman passif). La laximétrie au Télos s'avère un complément objectif à l'examen clinique pour atteindre un triple but : diagnostique, pronostique et thérapeutiqu

Electrochemical, vibrational, optical and Hirshfeld surface studies of 3D- bis[di(1,10-phenanthrolinium) (1,10-phenanthroline)] hexacyanoferrate ethanol trihydrate

In this work, structure, spectroscopic, optical and electrochemical investigation of a new complex of the hexacyanoferrate [Fe(CN)(6)](4-) and 1,10-phenanthroline have been examined. The complex has been resolved by single crystal X-ray diffraction at room temperature. In the crystal structure individual complex is interconnected through strong hydrogen bonds of type O-H...N, N-H...O and pi-pi interactions to obtain a 3D supramolecular shape. The three-dimensional Hirshfeld surface (3D-HS) investigation and the two-dimensional unique finger impression plots (2D-FP) reveal that the H... O, H... N and H... H contacts dominates the structure. The cyclic voltammetry explores the electrochemical performance of the complex. The complex reveals excellent supercapacitives properties with a higher specific capacitance equal to 1000 F.g(-1) for the scans rate 10 mVs(-1)