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KMID : 0923620120120050207
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Immune Network
2012 Volume.12 No. 5 p.207 ~ p.212
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T Cell Immunoglobulin Mucin Domain (TIM)-3 Promoter Activity in a Human Mast Cell Line
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Kim Jung-Sik
Shin Dong-Chul
Woo Min-Yeong
Kwon Myung-Hee
Kim Kyong-Min
Park Sun
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Abstract
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T cell immunoglobulin mucin domain (TIM)-3 is an immunomodulatory molecule and upregulated in T cells by several cytokines. TIM-3 also influences mast cell function but its transcriptional regulation in mast cells has not been clarified. Therefore, we examined the transcript level and the promoter activity of TIM-3 in mast cells. The TIM-3 transcript level was assessed by real-time RT-PCR and promoter activity by luciferase reporter assay. TIM-3 mRNA levels were increased in HMC-1, a human mast cell line by TGF-β1 stimulation but not by stimulation with interferon (IFN)-α, IFN-λ, TNF-α, or IL-10. TIM-3 promoter ?349∼＋144 bp region relative to the transcription start site was crucial for the basal and TGF-β1-induced TIM-3 promoter activities in HMC-1 cells. TIM-3 promoter activity was increased by overexpression of Smad2 and Smad4, downstream molecules of TGF-β1 signaling. Our results localize TIM-3 promoter activity to the region spanning ?349 to ＋144 bp in resting and TGF-β1 stimulated mast cells.
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KEYWORD
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T cell immunoglobulin mucin domain-3, TGF-β1, Transcription, Mast cells, Smad
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