Abstract:
:Krüppel-like factor 4 (KLF4), a zinc finger transcription factor, has been implicated in the inflammation mediated by macrophages and endothelial cells by regulating the expression of inflammatory mediators. Here, we investigated whether KLF4 affects the expression of inducible nitric oxide synthase (iNOS), an important inflammatory mediator, in the human RA fibroblast-like synovial cell line MH7A. A pcDNA3.1-KLF4 plasmid or short interfering RNA KLF4 was transfected into MH7A cells, and the iNOS expression and nitric oxide (NO) production were analyzed by quantitative PCR, immunoblotting, and nitrite measurement. The iNOS promoter activity was determined by luciferase assay. The results showed overexpression of KLF4 increased iNOS expression and NO production in the presence or absence of TNF-α. Conversely, KLF4 knockdown markedly reduced iNOS expression and NO production induced by TNF-α. KLF4 activated the transcription activity of iNOS promoter in MH7A cells stimulated by TNF-α. This study indicates that KLF4 is important for regulating the expression of iNOS by TNF-α in human synoviocytes.
journal_name
Mol Cell Biochemjournal_title
Molecular and cellular biochemistryauthors
Mo X,Chen J,Wang X,Pan Z,Ke Y,Zhou Z,Xie J,Lv G,Luo Xdoi
10.1007/s11010-017-3115-9subject
Has Abstractpub_date
2018-01-01 00:00:00pages
77-84issue
1-2eissn
0300-8177issn
1573-4919pii
10.1007/s11010-017-3115-9journal_volume
438pub_type
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