美國(guó)研究人員10月13日?qǐng)?bào)告說(shuō),他們通過(guò)剔除某種關(guān)鍵基因,,明顯改善了患鐮狀細(xì)胞貧血病小鼠的癥狀,。這一研究為治療人類鐮狀細(xì)胞貧血病提供了新思路,。
鐮狀細(xì)胞貧血病是一種較常見的遺傳性血液疾病,,患者紅細(xì)胞中的血紅蛋白突變,由圓圈形變?yōu)殓牭缎?,而且變得僵硬,,進(jìn)而阻塞毛細(xì)血管,阻礙血液流動(dòng),。與此同時(shí),,紅細(xì)胞的存活期也縮短,從而導(dǎo)致貧血,。
通常,,嬰兒出生6個(gè)月左右體內(nèi)就不再制造“胚胎版”血紅蛋白,轉(zhuǎn)而制造“成人版”血紅蛋白,,“成人版”血紅蛋白發(fā)生突變后會(huì)引發(fā)鐮狀細(xì)胞貧血病,。此前研究表明,對(duì)患有該病的孩子,,如果能將“胚胎版”血紅蛋白重新引入其體內(nèi),可以幫助減輕鐮狀細(xì)胞貧血病的損害,。
哈佛大學(xué)醫(yī)學(xué)院等機(jī)構(gòu)研究人員在實(shí)驗(yàn)中發(fā)現(xiàn),,一種名為BCL11a的基因會(huì)間接地抑制“胚胎版”血紅蛋白的制造。他們利用基因工程技術(shù),,把患鐮狀細(xì)胞貧血病的成年實(shí)驗(yàn)鼠體內(nèi)的BCL11a基因剔除,。結(jié)果發(fā)現(xiàn),實(shí)驗(yàn)鼠開始重新生產(chǎn)“胚胎版”血紅蛋白,,其鐮狀細(xì)胞貧血病癥狀也得到明顯改善,。
相關(guān)研究成果將發(fā)表在最新一期美國(guó)《科學(xué)》雜志上,。資助這項(xiàng)研究的美國(guó)全國(guó)心、肺,、血液研究所代理所長(zhǎng)蘇珊·舒林表示,,這一發(fā)現(xiàn)為未來(lái)治療鐮狀細(xì)胞貧血病提供了重要的新靶點(diǎn)。(生物谷 Bioon.com)
doi:10.1126/science.1211053
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Correction of Sickle Cell Disease in Adult Mice by Interference with Fetal Hemoglobin Silencing
Jian Xu, Cong Peng, Vijay G. Sankaran, Zhen Shao, Erica B. Esrick, Bryan G. Chong, Gregory C. Ippolito, Yuko Fujiwara, Benjamin L. Ebert, Philip W. Tucker, Stuart H. Orkin
Persistence of human fetal hemoglobin (HbF, α2γ2) in adults lessens the severity of sickle cell disease (SCD) and the β-thalassemias. Here, we show that the repressor BCL11A is required in vivo for silencing of γ-globin expression in adult animals, yet dispensable for red cell production. BCL11A serves as a barrier to HbF reactivation by known HbF-inducing agents. In a proof of principle test of BCL11A as a potential therapeutic target, we demonstrate that inactivation of BCL11A in SCD transgenic mice corrects the hematologic and pathologic defects associated with SCD through high-level pancellular HbF induction. Thus, interference with HbF silencing by manipulation of a single target protein is sufficient to reverse SCD.