Abstract：
:Up-regulation of cytosolic phospholipase A(2) (cPLA(2)) by cigarette smoke extract (CSE) may play a critical role in airway inflammatory diseases. However, the mechanisms underlying CSE-induced cPLA(2) expression in human tracheal smooth muscle cells (HTSMCs) were not completely understood. Here, we demonstrated that CSE-induced cPLA(2) protein and mRNA expression was inhibited by pretreatment with the inhibitors of AP-1 (tanshinone IIA) and p300 (garcinol) or transfection with siRNAs of c-Jun, c-Fos, and p300. Moreover, CSE also induced c-Jun and c-Fos expression, which were inhibited by pretreatment with the inhibitors of NADPH oxidase (diphenyleneiodonium chloride and apocynin) and the ROS scavenger (N-acetyl-L-cysteine) or transfection with siRNAs of p47(phox) and NADPH oxidase (NOX)2. CSE-induced c-Fos expression was inhibited by pretreatment with the inhibitors of MEK1 (U0126) and p38 MAPK (SB202190) or transfection with siRNAs of p42 and p38. CSE-induced c-Jun expression and phosphorylation were inhibited by pretreatment with the inhibitor of JNK1/2 (SP600125) or transfection with JNK2 siRNA. CSE-stimulated p300 phosphorylation was inhibited by pretreatment with the inhibitors of NADPH oxidase and JNK1/2. Furthermore, CSE-induced p300 and c-Jun complex formation was inhibited by pretreatment with diphenyleneiodonium chloride, apocynin, N-acetyl-L-cysteine or SP600125. These results demonstrated that CSE-induced cPLA(2) expression was mediated through NOX2-dependent p42/p44 MAPK and p38 MAPK/c-Fos and JNK1/2/c-Jun/p300 pathways in HTSMCs.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Cheng SE,Lin CC,Lee IT,Hsu CK,Kou YR,Yang CMdoi
10.1002/jcb.22949subject
Has Abstractpub_date
2011-02-01 00:00:00pages
589-99issue
2eissn
0730-2312issn
1097-4644journal_volume
112pub_type
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