Regulation of the Human FcεRI α-Chain Distal Promoter
| Autor: | Makoto Nishiyama, Hideoki Ogawa, Chisei Ra, Susumu Furukawa, Ko Okumura, Chiharu Nishiyama, Kyoko Takahashi, Masanari Hasegawa, Yushiro Akizawa, Tomonobu Ito |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | The Journal of Immunology. 170:3732-3738 |
| ISSN: | 1550-6606 0022-1767 |
| DOI: | 10.4049/jimmunol.170.7.3732 |
| Popis: | The α-chain of the high affinity receptor for IgE (FcεRI) is essential for cell surface expression of FcεRI and binding of the IgE Ab. The human α-chain gene possesses two promoters: the proximal promoter, which is highly conserved with that of rodent; and the distal promoter, the structure and role of which are largely unknown. Transcriptional regulation of the α-chain distal promoter was investigated in this study. Transient reporter assay revealed critical region for transcription activity located within −27/−17. EMSA identified Elf-1, YY1, and PU.1 as transcription factors binding to this region. In contrast to the proximal promoter, which was trans-activated by YY1 and PU.1, these transcription factors exhibited repressive function on this promoter. Addition of IL-4 caused a marked increase in transcription from the distal promoter and subsequently increased the intracellular production of the α-chain. These results indicate that IL-4-dependent up-regulation of the human α-chain was due to enhancement of distal promoter activity and suggests that the two promoters have different regulatory mechanisms for α-chain expression. |
| Databáze: | OpenAIRE |
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