Chemical Composition of RR Lyn - an Eclipsing Binary System with Am and Boo Type Components
JOURNAL OF ASTRONOMY AND SPACE SCIENCE
Authors: Jeong, Yeuncheol; Yushchenko, Alexander V.; Doikov, Dmytry N.; Gopka, Vira F.; Yushchenko, Volodymyr O.
Abstract
High-resolution spectroscopic observations of the eclipsing binary system RR Lyn were made using the 1.8 m telescope at the Bohuynsan Optical Astronomical Observatory in Korea. The spectral resolving power was R = 82,000, with a signal to noise ratio of S/N > 150. We found the effective temperatures and surface gravities of the primary and secondary components to be equal to T-eff = 7,920 & 7,210 K and log(g) = 3.80 & 4.16, respectively. The abundances of 34 and 17 different chemical elements were found in the atmospheric components. Correlations between the derived abundances with condensation temperatures and the second ionization potentials of these elements are discussed. The primary component is a typical metallic line star with the abundances of light and iron group elements close to solar values, while elements with atomic numbers Z > 30 are overabundant by 0.5-1.5 dex with respect to solar values. The secondary component is a. Boo type star. In this type of stars, CNO abundances are close to solar values, while the abundance pattern shows a negative correlation with condensation temperatures.
Apolipoprotein C3 induces inflammation and organ damage by alternative inflammasome activation
NATURE IMMUNOLOGY
Authors: Zewinger, Stephen; Reiser, Jochen; Jankowski, Vera; Alansary, Dalia; Hahm, Eunsil; Triem, Sarah; Klug, Mira; Schunk, Stefan J.; Schmit, David; Kramann, Rafael; Koerbel, Christina; Ampofo, Emmanuel; Laschke, Matthias W.; Selejan, Simina-Ramona; Paschen, Anna; Herter, Tobias; Schuster, Susanne; Silbernagel, Guenther; Sester, Martina; Sester, Urban; Assmann, Gunter; Bals, Robert; Kostner, Gerhard; Jahnen-Dechent, Willi; Menger, Michael D.; Rohrer, Lucia; Maerz, Winfried; Boehm, Michael; Jankowski, Joachim; Kopf, Manfred; Latz, Eicke; Niemeyer, Barbara A.; Fliser, Danilo; Laufs, Ulrich; Speer, Thimoteus
Abstract
NLRP3-inflammasome-driven inflammation is involved in the pathogenesis of a variety of diseases. Identification of endogenous inflammasome activators is essential for the development of new anti-inflammatory treatment strategies. Here, we identified that apolipoprotein C3 (ApoC3) activates the NLRP3 inflammasome in human monocytes by inducing an alternative NLRP3 inflammasome via caspase-8 and dimerization of Toll-like receptors 2 and 4. Alternative inflammasome activation in human monocytes is mediated by the Toll-like receptor adapter protein SCIMP. This triggers Lyn/Syk-dependent calcium entry and the production of reactive oxygen species, leading to activation of caspase-8. In humanized mouse models, ApoC3 activated human monocytes in vivo to impede endothelial regeneration and promote kidney injury in an NLRP3- and caspase-8-dependent manner. These data provide new insights into the regulation of the NLRP3 inflammasome and the pathophysiological role of triglyceride-rich lipoproteins containing ApoC3. Targeting ApoC3 might prevent organ damage and provide an anti-inflammatory treatment for vascular and kidney diseases.