期刊
BIOLOGICAL & PHARMACEUTICAL BULLETIN
卷 42, 期 3, 页码 489-495出版社
PHARMACEUTICAL SOC JAPAN
DOI: 10.1248/bpb.b18-00928
关键词
cystic fibrosis; toll-like receptor-2; curcumin; bronchial epithelial cell; specificity protein 1 (SP1)
资金
- Japan Society for the Promotion Science (JSPS) KAKENHI [JP25460102, JP17H03570, JP15J09420]
- JSPS Program on Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation [S2510]
- Program for Leading Graduate Schools HIGO (Health life science: Interdisciplinary and Glocal Oriented
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
Cystic fibrosis (CF), the most common lethal inherited disorder caused by mutation in the gene encoding the CF transmembrane regulator (CFTR), is characterized by chronic inflammation that ultimately leads to death from respiratory failure. In CF patients, up-regulation of toll-like receptor-2 (TLR2), a pattern recognition receptor that senses CF-pathogenic bacteria Staphylococcus aureus peptidoglycan (PGN), in airway epithelial cells is observed, and enhanced proinflammatory responses towards PGN may result in detrimental effects in CF patients. Here, we showed that curcumin, a well known anti-inflammatory agent derived from the curry spice turmeric, inhibits TLR2 expression in CF bronchial epithelial cell line, CFBE410- cells. Strong suppression of TLR2 gene and protein expression was observed at more than 40 mu M of curcumin treatment in CFBE410- cells. Consistent with decreased expression of TLR2, PGN-dependent interleukin-8 (IL-8) gene up-regulation was markedly reduced by 40 mu M of curcumin treatment. Strong reductions of TLR2 gene expression and function were also observed in primary human CF bronchial epithelial cells, but not in human non-CF primary cells. Interestingly, curcumin treatment decreased nuclear expression of transcription factor specificity protein 1 (SP1), a factor that is critical for increased basal TLR2 expression in CF cell line and primary cells. Finally, curcumin-dependent SP1 reduction was diminished by anti-oxidant N-acetylcystein (NAC) and proteasomal inhibitor MG-132, suggesting the crucial roles of oxidative and proteasomal degradation pathways. Taken together, our study shows that curcumin down-regulates TLR2 gene expression and function in CF bronchial epithelial cells possibly by accelerating SP1 degradation via an oxidative process.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据