著作: [廣島 佑香]/Hsu Kenneth/Tedla Nicodemus/Wong Wing Sze/Chow Sharron/Kawaguchi Naomi/Geczy L Carolyn/S100A8/A9 and S100A9 reduce acute lung injury./[Immunology and Cell Biology]
(英) S100A8/A9 and S100A9 reduce acute lung injury.
(英) S100A8 and S100A9 are myeloid cell-derived proteins that are elevated in several types of inflammatory lung disorders. Pro- and anti-inflammatory properties are reported and these proteins are proposed to activate TLR4. S100A8 and S100A9 can function separately, likely through distinct receptors but a systematic comparison of their effects in vivo are limited. Here we assess inflammation in murine lung following S100A9 and S100A8/A9 inhalation. Unlike S100A8, S100A9 promoted mild neutrophil and lymphocyte influx, possibly mediated in part, by increased mast cell degranulation and selective upregulation of some chemokine genes, particularly CXCL-10. S100 proteins did not significantly induce proinflammatory mediators including TNF-, IL-1, IL-6 or serum amyloid A3 (SAA3). In contrast to S100A8, neither preparation induced S100A8 or IL-10 mRNA/protein in airway epithelial cells, or in tracheal epithelial cells in vitro. Like S100A8, S100A9 and S100A8/A9 reduced neutrophil influx in acute lung injury (ALI) provoked by LPS challenge but were somewhat less inhibitory, possibly because of differential effects on expression of some chemokines, IL-1, SAA3 and IL-10. Novel common pathways including increased induction of an NAD(+)-dependent protein deacetylase sirtuin-1 (SIRT1) that may reduce NF-B signalling, and increased STAT3 activation may reduce LPS activation. Results suggest a role for these proteins in normal homeostasis and protective mechanisms in the lung.Immunology and Cell Biology accepted article preview online, 11 January 2017. doi:10.1038/icb.2017.2.
Immunology and Cell Biology(Australian Society for Immunology)
|年月日||必須||2017年 1月 11日|