伯豪助力廣州生物院闡明ANGPTL7激活造血干細胞機制
瀏覽次數:2730 發布日期:2015-2-11
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上海伯豪助力廣州生物院闡明ANGPTL7促進造血干細胞擴增機理
2015年1月30日,國際學術期刊Haematologica 在線發表了中國科學院廣州生物醫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促進造血干細胞體外擴增和體內造血系統重建的機制。
成功擴增造血干細胞可有效促進造血干細胞臨床移植應用。一些類血管生成蛋白,如angiopoietin-like 7,可以提高造血干細胞增殖活性。然而,對ANGPTL7促進人體造血干細胞擴增作用及其激活的下游信號通路的了解卻仍然不清晰。
研究中,實驗人員發現了一種可促進人造血干細胞和祖細胞擴增的鼠胚胎肝臟細胞系,該細胞特異性高表達Angptl7[l1] 蛋白。另外,研究還發現ANGPLT7蛋白可促進人體造血干細胞和祖細胞在異種移植宿主體內擴增和造血系統重建。RNA-Seq分析結果顯示,ANGPTL7激活人體造血干細胞和組細胞中CXCR4、HOXB4和WNT下游靶點的表達。另外,通過化學調控WNT信號通路可以弱化ANGTPL7對人體造血干細胞和祖細胞的作用(本研究中RNA-Seq服務由上海伯豪生物技術有限公司提供) 。
該研究發現了分泌生長因子ANGPTL7是人體造血干細胞和祖細胞擴增和造血重建的重要調節因子,對造血干細胞臨床移植應用具有重要的指導意義。
ANGPTL7激活造血干細胞機制
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.
來源:廣州生物醫藥與健康研究院