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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Rep 2016 ; 6 (ä): ä Nephropedia Template TP
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Identification of P-Rex1 as an anti-inflammatory and anti-fibrogenic target for pulmonary fibrosis #MMPMID27173636
Pulmonary fibrosis (PF) leads to progressive and often irreversible loss of lung functions, posing a health threat with no effective cure. We examined P-Rex1, a PI3K- and G protein ??-regulated guanine nucleotide exchange factor (GEF) of the Rac small GTPase, for its potential involvement in PF. In a bleomycin-induced PF model, mice deficient in p-rex1 had well-preserved alveolar structure and survived significantly better than their wild type (WT) littermates. The p-rex1?/? mice expressed significantly less proinflammatory cytokines and chemokines and had reduced leukocyte infiltration in the lung tissue than their WT littermates. P-Rex1 was detected in lung fibroblasts of WT mice, and its genetic deletion attenuated TGF?-1-stimulated lung fibroblast migration, Rac1 activation and p38 MAPK phosphorylation. The p-rex1?/? mice showed significantly reduced pathological changes including the expression of ?-smooth muscle actin, fibronectin and TGF?-1 compared with their WT controls. Expression of a GEF-deficient P-Rex1 mutant effectively blocked Smads-dependent transcriptional activation, suggesting that P-Rex1 is a downstream mediator of TGF?-1 signaling. These findings identify P-Rex1 as a novel player of PF, suggesting that targeting P-Rex1 may simultaneously block the inflammatory and fibrogenic processes of PF.