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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Respir+Cell+Mol+Biol
2014 ; 50
(4
): 737-47
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Inhibition of transglutaminase 2, a novel target for pulmonary fibrosis, by two
small electrophilic molecules
#MMPMID24175906
Olsen KC
; Epa AP
; Kulkarni AA
; Kottmann RM
; McCarthy CE
; Johnson GV
; Thatcher TH
; Phipps RP
; Sime PJ
Am J Respir Cell Mol Biol
2014[Apr]; 50
(4
): 737-47
PMID24175906
show ga
Idiopathic pulmonary fibrosis (IPF) is characterized by progressive fibrotic
destruction of normal lung architecture. Due to a lack of effective treatment
options, new treatment approaches are needed. We previously identified
transglutaminase (TG)2, a multifunctional protein expressed by human lung
fibroblasts (HLFs), as a positive driver of fibrosis. TG2 catalyzes crosslinking
of extracellular matrix proteins, enhances cell binding to fibronectin and
integrin, and promotes fibronectin expression. We investigated whether the small
electrophilic molecules 2-cyano-3,12-dioxoolean-1,9-dien-28-oic acid (CDDO) and
15-deoxy-delta-12,14-prostaglandin J2 (15d-PGJ2) inhibit the expression and
profibrotic functions of TG2. CDDO and 15d-PGJ2 reduced expression of TG2 mRNA
and protein in primary HLFs from control donors and donors with IPF. CDDO and
15d-PGJ2 also decreased the in vitro profibrotic effector functions of HLFs
including collagen gel contraction and cell migration. The decrease in TG2
expression did not occur through activation of the peroxisome proliferator
activated receptor ? or generation of reactive oxidative species. CDDO and
15d-PGJ2 inhibited the extracellular signal-regulated kinase pathway, resulting
in the suppression of TG2 expression. This is the first study to show that small
electrophilic compounds inhibit the expression and profibrotic effector functions
of TG2, a key promoter of fibrosis. These studies identify new and important
antifibrotic activities of these two small molecules, which could lead to new
treatments for fibrotic lung disease.