近日,來自美國芝加哥大學的研究人員表示,,轉錄因子ETS1對自然殺傷(NK)細胞具有重要的調節(jié)作用,。而缺乏ETS1的NK細胞,會出現(xiàn)基因失調及慢性免疫激活,。相關研究成果于5月17日在線發(fā)表在Immunity上,。
轉錄因子是能夠結合在基因上游特異核苷酸序列上的蛋白質,活化后從胞質轉位至胞核,,通過識別和結合基因啟動子區(qū)的順式作用元件,啟動和調控基因表達,。已知眾多的轉錄因子調節(jié)了自然殺傷(NK)細胞的發(fā)育,但是到目前為止,,它們的精確功能還不十分明確,。
在該研究中,研究人員利用全局基因表達及全基因組關聯(lián)分析,,并結合發(fā)育及功能研究,,揭示了NK細胞中ETS1轉錄因子的三種作用。
研究發(fā)現(xiàn),,ETS1作用于NK細胞發(fā)育的早期階段,,并促進以下蛋白分子的表達:關鍵性的轉錄調節(jié)因子(包括T-BET及ID2),NK細胞受體(NKRs)(包括NKp46,、Ly49H及Ly49D),,以及對NKR功能必需的信號分子,。因此,在刺激激活NKRs以后,,Ets1-/- 的NK細胞不能成功脫粒,。
盡管如此,這些細胞對細胞因子是高度靈敏的,,并具有慢性刺激的特性,,包括NKRs以及多種激活相關基因的增強表達。
所以,,ETS1調節(jié)NK細胞內廣泛的基因表達程序,,促進靶細胞的識別,同時限制細胞因子誘導的激活作用,。(生物谷Deepblue編譯)
doi: 10.1016/j.immuni.2012.04.006
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Gene Deregulation and Chronic Activation in Natural Killer Cells Deficient in the Transcription Factor ETS1
Kevin Ramirez, Katherine J. Chandler, Christina Spaulding, Sasan Zandi, Mikael Sigvardsson, Barbara J. Graves, Barbara L. Kee.
Multiple transcription factors guide the development of mature functional natural killer (NK) cells, yet little is known about their function.We used global gene expression and genome-wide binding analyses combined with developmental and functional studies to unveil three roles for the ETS1 transcription factor in NK cells.ETS1 functions at the earliest stages of NK cell development to promote expression of critical transcriptional regulators including T-BET and ID2, NK cell receptors (NKRs) including NKp46, Ly49H, and Ly49D, and signaling molecules essential for NKR function.As a consequence, Ets1?/? NK cells fail to degranulate after stimulation through activating NKRs. Nonetheless, these cells are hyperresponsive to cytokines and have characteristics of chronic stimulation including increased expression of inhibitory NKRs and multiple activation-associated genes.Therefore, ETS1 regulates a broad gene expression program in NK cells that promotes target cell recognition while limiting cytokine-driven activation.