Project description:Caecal contents from three specific pathogen-free (SPF) mice, and three germ-free (GF) mice were analyzed by DIA-MS (SWATH-MS) using TripleTOF 5600+ (SCIEX). Paraprevotella clara (P. clara) culture supernatants nontreated and treated tunicamycin or 2-fluro-L-fucose (2F-Fuc) were analyzed by DIA-MS using Q Exactive HF-X (Thermo Fisher Scientific). In addition, GF mouse caecal contents were incubated with P. clara or medium control. Supernatant samples were collected at the indicated time points and subjected to peptidome analysis using Q Exactive HF-X (Thermo Fisher Scientific).
Project description:00502 protein derived from Paraprevotella clara, as well as mixture of 00502 protein and human PRSS2 were analyzed by Native-PAGE. The observed bands were cut out and digested in-gel. The digested peptides were analyzed by DDA-MS using Q Exactive HF-X .
Project description:Mouse livers were analyzed by lipidomics and urine by metabolomics.An Agilent Ultra-Performance Liquid Chromatography/Electrospray Ion Quadrupole Time-of-Flight-Mass Spectrometer (UPLC-ESI-QTOFMS) (Agilent, Santa Clara, CA) was utilized for lipid and other metabolites proofing in this work.
Project description:Chronic lung diseases are marked by excessive inflammation and epithelial remodeling. Reduced Clara cell secretory function and corresponding decreases in the abundance of the major Clara cell secreted protein, CCSP, are characteristically seen in these disease states. We sought to define the impact of Clara cell and CCSP depletion on regulation of the lung inflammatory response. We used chemical and genetic mouse models of Clara cell and CCSP deficiency (CCSP-/-) coupled with P. aeruginosa lipopolysaccharide (LPS) elicited inflammation. Exposure of Clara cell depleted or CCSP-/- mice to LPS resulted in augmented inflammation as assessed by polymorphonuclear leukocyte recruitment to the airspace. Gene expression analysis and pathway modeling of the CCSP-/- inflammatory response implicated increased TNF-alpha signaling. Consistent with this model was the demonstration of significantly elevated TNF-alpha in airway fluid of LPS-stimulated CCSP-/- mice compared to similarly exposed wild type mice. Increased LPS-elicited TNF-alpha production was also observed in cultured lung macrophages from CCSP-/- mice compared to wild type mice. We demonstrate that macrophages from Clara cell depleted and CCSP-/- mice displayed increased TLR4 surface expression. Our results provide evidence that Clara cells can attenuate inflammation through regulation of macrophage behavior and suggest that epithelial remodeling leading to reduced Clara cell secretory function is an important factor that increases the intensity of lung inflammation in chronic lung disease.