Redox proteomics of the inflammatory secretome identifies a common set of redoxins and other glutathionylated proteins released in inflammation, influenza virus infection and oxidative stress

• Published in: PloS one 2015-05, Vol.10 (5), p.e0127086-e0127086
• Main Authors: Checconi, Paola, Salzano, Sonia, Bowler, Lucas, Mullen, Lisa, Mengozzi, Manuela, Hanschmann, Eva-Maria, Lillig, Christopher Horst, Sgarbanti, Rossella, Panella, Simona, Nencioni, Lucia, Palamara, Anna Teresa, Ghezzi, Pietro
• Format: Article
• Language: English
• Subjects: Acetylcysteine; Analysis; Animals; Antioxidants; Antioxidants - pharmacology; Avian flu; Biochemistry; Biomarkers; Blotting, Western; Cell Line; Cytokines; Dexamethasone; Dexamethasone - pharmacology; Down-Regulation - drug effects; Epithelial cells; Glucocorticoids; Glutathione; Glutathione - metabolism; Health aspects; HIV; Human immunodeficiency virus; Humans; Immunity; Immunoregulation; Infections; Infectious diseases; Inflammation; Inflammation - complications; Inflammation - metabolism; Inflammation - pathology; Influenza; Influenza, Human - complications; Influenza, Human - metabolism; Influenza, Human - pathology; Kinases; Lipopolysaccharides; Lipopolysaccharides - pharmacology; Macrophages; Medical schools; Mice; Molecular biology; Oxidation-Reduction - drug effects; Oxidative stress; Oxidative Stress - drug effects; Peroxiredoxin; Peroxiredoxins - metabolism; Physiological aspects; Profilins - metabolism; Protein research; Proteins; Proteins - metabolism; Proteomics; Public health; RAW 264.7 Cells; Redox properties; Rodents; Secretome; Sulfhydryl Compounds - pharmacology; Thioredoxin; Thioredoxins - metabolism; Tumor necrosis factor-TNF; Tumor necrosis factor-α; Vimentin; Vimentin - metabolism; Viruses
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0127086

Protein cysteines can form transient disulfides with glutathione (GSH), resulting in the production of glutathionylated proteins, and this process is regarded as a mechanism by which the redox state of the cell can regulate protein function. Most studies on redox regulation of immunity have focused on intracellular proteins. In this study we have used redox proteomics to identify those proteins released in glutathionylated form by macrophages stimulated with lipopolysaccharide (LPS) after pre-loading the cells with biotinylated GSH. Of the several proteins identified in the redox secretome, we have selected a number for validation. Proteomic analysis indicated that LPS stimulated the release of peroxiredoxin (PRDX) 1, PRDX2, vimentin (VIM), profilin1 (PFN1) and thioredoxin 1 (TXN1). For PRDX1 and TXN1, we were able to confirm that the released protein is glutathionylated. PRDX1, PRDX2 and TXN1 were also released by the human pulmonary epithelial cell line, A549, infected with influenza virus. The release of the proteins identified was inhibited by the anti-inflammatory glucocorticoid, dexamethasone (DEX), which also inhibited tumor necrosis factor (TNF)-α release, and by thiol antioxidants (N-butanoyl GSH derivative, GSH-C4, and N-acetylcysteine (NAC), which did not affect TNF-α production. The proteins identified could be useful as biomarkers of oxidative stress associated with inflammation, and further studies will be required to investigate if the extracellular forms of these proteins has immunoregulatory functions.