https://scholars.lib.ntu.edu.tw/handle/123456789/160842
標題: | STAT1 AND STAT2 BUT NOT STAT3 ARBITRATE CONTRADICTORY GROWTH SIGNALS ELICITED BY IFNα/β IN T LYMPHOCYTES | 作者: | Ramon Gimeno Lee, Chien-kuo Christian Schindler David E. Levy 李建國 |
公開日期: | 七月-2005 | 卷: | 25 | 期: | 13 | 起(迄)頁: | 5456-5465 | 來源出版物: | MOLECULAR AND CELLULAR BIOLOGY | 摘要: | Alpha/beta interferon (IFN-{alpha}/ß) triggers antiviral and antiproliferative responses in target cells through modulation of gene expression. The JAK-STAT pathway is the major mediator of these biological effects through the activation of the transcription factors STAT1 and STAT2, and gene ablation studies have demonstrated that both STAT1 and STAT2 are required for most antiviral responses induced by IFN-{alpha}/ß. However, additional signaling pathways are also activated by IFN. Here, we show that these additional pathways provoke a proliferative response in activated T lymphocytes. While activation of IFN-stimulated gene factor 3 produces a dominant inhibitory signal capable of overriding the mitogenic response, absence of either STAT 1 or STAT2 leads to a proliferative response to IFN. Growth stimulation by IFN-{alpha}/ß is independent of other STAT proteins, particularly of STAT3, since T lymphocytes from STAT1-STAT3 double-knockout mice are growth stimulated by IFN-{alpha}/ß treatment. IFN-{alpha}/ß can cooperate with numerous T-cell mitogens, including interleukin-2 (IL-2), IL-4, IL-7, and IL-12, and can contribute to the rapid restoration of the thymus following glucocorticoid-mediated ablation. These results underscore the complexity of the cellular response to IFN and suggest that the ultimate outcome of IFN action results from a balance between growth-inhibitory and -stimulatory effects. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/233065 |
顯示於: | 免疫學研究所 |
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MCB 2005.pdf | 524 kB | Adobe PDF | 檢視/開啟 |
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