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伯豪助力廣州生物院闡明ANGPTL7激活造血干細(xì)胞機(jī)制

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上海伯豪助力廣州生物院闡明ANGPTL7促進(jìn)造血干細(xì)胞擴(kuò)增機(jī)理
 
2015年1月30日,國(guó)際學(xué)術(shù)期刊Haematologica 在線發(fā)表了中國(guó)科學(xué)院廣州生物醫(yī)藥與健康研究院李鵬研究組的最新研究成果ANGPTL7 regulates the expansion and repopulation of human hematopoietic stem and progenitor cells,該研究成果揭示了分泌蛋白ANGPLT7促進(jìn)造血干細(xì)胞體外擴(kuò)增和體內(nèi)造血系統(tǒng)重建的機(jī)制。
 
成功擴(kuò)增造血干細(xì)胞可有效促進(jìn)造血干細(xì)胞臨床移植應(yīng)用。一些類(lèi)血管生成蛋白,如angiopoietin-like 7,可以提高造血干細(xì)胞增殖活性。然而,對(duì)ANGPTL7促進(jìn)人體造血干細(xì)胞擴(kuò)增作用及其激活的下游信號(hào)通路的了解卻仍然不清晰。
 
研究中,實(shí)驗(yàn)人員發(fā)現(xiàn)了一種可促進(jìn)人造血干細(xì)胞和祖細(xì)胞擴(kuò)增的鼠胚胎肝臟細(xì)胞系,該細(xì)胞特異性高表達(dá)Angptl7[l1] 蛋白。另外,研究還發(fā)現(xiàn)ANGPLT7蛋白可促進(jìn)人體造血干細(xì)胞和祖細(xì)胞在異種移植宿主體內(nèi)擴(kuò)增和造血系統(tǒng)重建。RNA-Seq分析結(jié)果顯示,ANGPTL7激活人體造血干細(xì)胞和組細(xì)胞中CXCR4、HOXB4和WNT下游靶點(diǎn)的表達(dá)。另外,通過(guò)化學(xué)調(diào)控WNT信號(hào)通路可以弱化ANGTPL7對(duì)人體造血干細(xì)胞和祖細(xì)胞的作用(本研究中RNA-Seq服務(wù)由上海伯豪生物技術(shù)有限公司提供) 。
 
該研究發(fā)現(xiàn)了分泌生長(zhǎng)因子ANGPTL7是人體造血干細(xì)胞和祖細(xì)胞擴(kuò)增和造血重建的重要調(diào)節(jié)因子,對(duì)造血干細(xì)胞臨床移植應(yīng)用具有重要的指導(dǎo)意義。
 
ANGPTL7激活造血干細(xì)胞機(jī)制 
 
原文出處:Yiren Xiao, Zhiwu Jiang, Yin Li, et al. ANGPTL7 regulates the expansion and repopulation of human hematopoietic stem and progenitor cells. Haematologica. 2015.
 
Abstract:
Successful expansion of hematopoietic stem cells would benefit the use of hematopoietic stem cell transplants in the clinic. Several angiopoietin-like proteins, including angiopoietin-like 7, can support the activity of hematopoietic stem cells. However, effects of ANGPTL7 on human hematopoietic stem cells and the downstream signaling cascade activated by ANGPTL7 are poorly understood. Here, we established a human hematopoietic stem and progenitor cell-supportive mouse fetal liver cell line that specifically expressed the Angptl7 protein. Furthermore, we found ANGPTL7 is capable of stimulating human hematopoietic stem and progenitor cell expansion and increasing the repopulation activities of human hematopoietic progenitors in xenografts. RNA-sequencing analysis showed that ANGPTL7 activated the expression of CXCR4, HOXB4 and Wnt downstream targets in human hematopoietic progenitors. In addition, chemical manipulation of Wnt signaling diminished the effects of ANGPTL7 on human hematopoietic stem and progenitor cells in culture. In summary, we identify the secreted growth factor ANGPTL7 as a regulator of both human hematopoietic stem and progenitor cells expansion and regeneration.
 
來(lái)源:廣州生物醫(yī)藥與健康研究院
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