| Literature DB >> 9155641 |
A Andoh1, Y Fujiyama, K Sumiyoshi, H Sakumoto, H Okabe, T Bamba.
Abstract
The increased expression of decay-accelerating factor (DAF) has been detected in intestinal epithelial cells at the inflamed mucosa. In this study, we examined the effects of tumour necrosis factor (TNF)-alpha on DAF expression in three intestinal epithelial cell lines. DAF mRNA expression was evaluated by Northern blot analysis, and DAF protein expression was analysed by biotin labelling and immunoprecipitation. TNF-alpha induced a marked increase in DAF mRNA and protein expression in HT-29, T84 and Caco-2 cells. In HT-29 cells, the effects of TNF-a on DAF mRNA accumulation were observed in a dose-dependent manner; DAF mRNA accumulation reached a maximum at 3-6 hr, and then gradually decreased. These effects of TNF-alpha required de novo protein synthesis. Messenger RNA stability studies suggested that TNF-alpha partially regulated DAF gene expression by a posttranscriptional mechanism. Moreover, the combination of TNF-alpha and interleukin (IL)-4 induced an additive increase in DAF mRNA accumulation in HT-29 and T84 cells. In human intestinal epithelial cells, TNF-alpha acts as a potent inducer of DAF mRNA expression, indicating an important role for TNF-alpha in the regulation of DAF expression at the inflamed mucosa.Entities:
Mesh：
Substances：
Year: 1997 PMID： 9155641 PMCID： PMC1456598 DOI： 10.1111/j.1365-2567.1997.00358.x
Source DB: PubMed Journal: Immunology ISSN： 0019-2805 Impact factor: 7.397