40 research outputs found
Activation of an endothelial Notch1-Jagged1 circuit induces VCAM1 expression, an effect amplified by interleukin-1β
The Notch1 and Notch4 signaling pathways regulate endothelial cell homeostasis. Inflammatory cytokines induce the expression of endothelial adhesion molecules, including VCAM1, partly by downregulating Notch4 signaling. We investigated the role of endothelial Notch1 in this IL-1β-mediated process. Brief treatment with IL-1β upregulated endothelial VCAM1 and Notch ligand Jagged1. IL-1β decreased Notch1 mRNA levels, but levels of the active Notch1ICD protein remained constant. IL-1β-mediated VCAM1 induction was downregulated in endothelial cells subjected to pretreatment with a pharmacological inhibitor of the γ-secretase, which activates Notch receptors, producing NotchICD. It was also downregulated in cells in which Notch1 and/or Jagged1 were silenced.Conversely, the forced expression of Notch1ICD in naïve endothelial cells upregulated VCAM1 per se and amplified IL-1β-mediated VCAM1 induction. Jagged1 levels increased and Notch4 signaling was downregulated in parallel. Finally, Notch1ICD and Jagged1 expression was upregulated in the endothelium of the liver in a model of chronic liver inflammation.In conclusion, we describe here a cell-autonomous, pro-inflammatory endothelial Notch1-Jagged1 circuit (i) triggering the expression of VCAM1 even in the absence of inflammatory cytokines and (ii) enhancing the effects of IL-1β. Thus, IL-1β regulates Notch1 and Notch4 activity in opposite directions, consistent with a selective targeting of Notch1 in inflamed endothelium
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ĐŃодНОМона и иŃŃНодОвана кОнŃŃŃŃĐşŃĐ¸Ń ĐżŃоСОкоŃаПиŃĐľŃкОгО ŃканоŃĐ° Đ´ĐťŃ Đ˝Đ°Đ˝ĐžĐźĐ¸ĐşŃĐžŃкОпОв на ĐžŃнОво диПОŃŃĐ˝ŃŃ
ĐżŃоСОŃНоПонŃОв. ĐĐžŃŃŃОона и иŃŃНодОвана ĐźĐžĐ´ĐľĐťŃ ŃканоŃĐ° ĐżŃи пОПОŃи ĐżŃОгŃĐ°ĐźĐźŃ MicroCap 7.0
FIREBall-2: advancing TRL while doing proof-of-concept astrophysics on a suborbital platform
Here we discuss advances in UV technology over the last decade, with an
emphasis on photon counting, low noise, high efficiency detectors in
sub-orbital programs. We focus on the use of innovative UV detectors in a NASA
astrophysics balloon telescope, FIREBall-2, which successfully flew in the Fall
of 2018. The FIREBall-2 telescope is designed to make observations of distant
galaxies to understand more about how they evolve by looking for diffuse
hydrogen in the galactic halo. The payload utilizes a 1.0-meter class telescope
with an ultraviolet multi-object spectrograph and is a joint collaboration
between Caltech, JPL, LAM, CNES, Columbia, the University of Arizona, and NASA.
The improved detector technology that was tested on FIREBall-2 can be applied
to any UV mission. We discuss the results of the flight and detector
performance. We will also discuss the utility of sub-orbital platforms (both
balloon payloads and rockets) for testing new technologies and proof-of-concept
scientific ideasComment: Submitted to the Proceedings of SPIE, Defense + Commercial Sensing
(SI19
FIREBall-2: The Faint Intergalactic Medium Redshifted Emission Balloon Telescope
The Faint Intergalactic Medium Redshifted Emission Balloon (FIREBall) is a
mission designed to observe faint emission from the circumgalactic medium of
moderate redshift (z~0.7) galaxies for the first time. FIREBall observes a
component of galaxies that plays a key role in how galaxies form and evolve,
likely contains a significant amount of baryons, and has only recently been
observed at higher redshifts in the visible. Here we report on the 2018 flight
of the FIREBall-2 Balloon telescope, which occurred on September 22nd, 2018
from Fort Sumner, New Mexico. The flight was the culmination of a complete
redesign of the spectrograph from the original FIREBall fiber-fed IFU to a
wide-field multi-object spectrograph. The flight was terminated early due to a
hole in the balloon, and our original science objectives were not achieved. The
overall sensitivity of the instrument and telescope was 90,000 LU, due
primarily to increased noise from stray light. We discuss the design of the
FIREBall-2 spectrograph, modifications from the original FIREBall payload, and
provide an overview of the performance of all systems. We were able to
successfully flight test a new pointing control system, a UV-optimized,
delta-doped and coated EMCCD, and an aspheric grating. The FIREBall-2 team is
rebuilding the payload for another flight attempt in the Fall of 2021, delayed
from 2020 due to COVID-19.Comment: 23 Pages, 14 Figures, Accepted for Publication in Ap
The Oxygen Paradox, the French Paradox, and age-related diseases
open46openDavies, Joanna M. S.; Cillard, Josiane; Friguet, Bertrand; Cadenas, Enrique; Cadet, Jean; Cayce, Rachael; Fishmann, Andrew; Liao, David; Bulteau, Anne-Laure; DerbrĂŠ, FrĂŠdĂŠric; RĂŠbillard, AmĂŠlie; Burstein, Steven; Hirsch, Etienne; Kloner, Robert A.; Jakowec, Michael; Petzinger, Giselle; Sauce, Delphine; Sennlaub, Florian; Limon, Isabelle; Ursini, Fulvio; Maiorino, Matilde; Economides, Christina; Pike, Christian J.; Cohen, Pinchas; Salvayre, Anne Negre; Halliday, Matthew R.; Lundquist, Adam J.; Jakowec, Nicolaus A.; Mechta-Grigoriou, Fatima; Mericskay, Mathias; Mariani, Jean; Li, Zhenlin; Huang, David; Grant, Ellsworth; Forman, Henry J.; Finch, Caleb E.; Sun, Patrick Y.; Pomatto, Laura C. D.; Agbulut, Onnik; Warburton, David; Neri, Christian; Rouis, Mustapha; Cillard, Pierre; Capeau, Jacqueline; Rosenbaum, Jean; Davies, Kelvin J. A.Davies, Joanna M. S.; Cillard, Josiane; Friguet, Bertrand; Cadenas, Enrique; Cadet, Jean; Cayce, Rachael; Fishmann, Andrew; Liao, David; Bulteau, Anne-Laure; DerbrĂŠ, FrĂŠdĂŠric; RĂŠbillard, AmĂŠlie; Burstein, Steven; Hirsch, Etienne; Kloner, Robert A.; Jakowec, Michael; Petzinger, Giselle; Sauce, Delphine; Sennlaub, Florian; Limon, Isabelle; Ursini, Fulvio; Maiorino, Matilde; Economides, Christina; Pike, Christian J.; Cohen, Pinchas; Salvayre, Anne Negre; Halliday, Matthew R.; Lundquist, Adam J.; Jakowec, Nicolaus A.; Mechta-Grigoriou, Fatima; Mericskay, Mathias; Mariani, Jean; Li, Zhenlin; Huang, David; Grant, Ellsworth; Forman, HENRY J.; Finch, Caleb E.; Sun, Patrick Y.; Pomatto, Laura C. D.; Agbulut, Onnik; Warburton, David; Neri, Christian; Rouis, Mustapha; Cillard, Pierre; Capeau, Jacqueline; Rosenbaum, Jean; Davies, Kelvin J. A
Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at âs=0.9 and 2.36 TeV
Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at root s = 0.9 and 2.36 TeV. The data were collected with the CMS detector during the LHC commissioning in December 2009. For non-single-diffractive interactions, the average charged-hadron transverse momentum is measured to be 0.46 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 0.9 TeV and 0.50 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between -2.4 and +2.4. At these energies, the measured pseudorapidity densities in the central region, dN(ch)/d eta vertical bar(vertical bar eta vertical bar and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date
Implication des voies de signalisation de la PGE2 et de Notch dans la transition phĂŠnotypique des cellules musculaires vasculaires vers un ĂŠtat inflammatoire
PARIS-BIUSJ-Thèses (751052125) / SudocPARIS-BIUSJ-Physique recherche (751052113) / SudocSudocFranceF