Blood:单细胞测序揭示内皮细胞到造血干细胞前体的发育轨迹

2020-06-06 QQY MedSci原创

单细胞分析确定了从内皮细胞到造血干细胞前体的轨迹,并确定了中间阶段。 动脉血源性内皮细胞产生两波CD45+细胞;早期的一波是祖细胞,随后是造血干细胞前体。

骨髓中的造血干细胞和祖细胞(HSPCs)来源于哺乳动物胚胎大动脉中的一小群血原性内皮细胞(HE)。在定植于胎儿肝脏之前,HE细胞经历了从内皮细胞到造血细胞的转化(EHT),引起HSPCs在动脉内聚集(IAC)。

为了检查内皮细胞(E)、HE和IAC细胞之间的细胞和分子转化,以及IACs内HSPCs的异质性,研究人员通过单细胞RNA测序(scRNA-Seq)和单细胞转座酶可及染色质测序(scATAC-Seq),分析了胚胎第9.5天(E9.5)至E11.5天小鼠胚胎尾动脉[背主动脉(DA)、脐带(U)、卵黄(V)]中的37000个细胞,确定了从E细胞到HE细胞再到IAC细胞的连续发展轨迹,以及可识别的中间阶段。

最接近HE的中间阶段,研究人员称之为pre-HE,其特征是富含SOX、FOX、GATA和SMAD模体的染色质的可及性增加。一个发育瓶颈将pre-HE和HE区分开来,此外,RUNX1水平调控pre-HE向HE转化的效率。在瓶颈时,pre-HE细胞中一个较远的候选Runx1增强子表现出较高的染色质可及性特异性

IAC细胞内不同的发育轨迹导致了CD45+ HSPCs的两个群体;先是淋巴髓系偏倚祖细胞,后是造血干细胞(pre-HSCs)前体。

总而言之,本研究的多组学单细胞图谱大大扩展了我们对HSC前体发生的理解。

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    2020-06-09 独孤立克

    干细胞是热点,但是进入临床仍然需要时间和临床疗效验证哦

    0

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    2020-06-08 neurowu
  4. [GetPortalCommentsPageByObjectIdResponse(id=1025462, encodeId=1030102546277, content=干细胞是热点,但是进入临床仍然需要时间和临床疗效验证哦, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0620, createdName=独孤立克, createdTime=Tue Jun 09 12:16:47 CST 2020, time=2020-06-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1271517, encodeId=354112e1517f3, content=<a href='/topic/show?id=a0ff950018f' target=_blank style='color:#2F92EE;'>#造血干细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=32, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=95001, encryptionId=a0ff950018f, topicName=造血干细胞)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e729101, createdName=huanbaofeng, createdTime=Mon Jun 08 03:16:47 CST 2020, time=2020-06-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1347477, encodeId=3bca134e4776a, content=<a href='/topic/show?id=88713e938c1' target=_blank style='color:#2F92EE;'>#发育#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=37938, encryptionId=88713e938c1, topicName=发育)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f4c124, createdName=neurowu, createdTime=Mon Jun 08 03:16:47 CST 2020, time=2020-06-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1494735, encodeId=aad11494e35c0, content=<a href='/topic/show?id=084d9499599' target=_blank style='color:#2F92EE;'>#造血#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=94995, encryptionId=084d9499599, topicName=造血)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=caed9138962, createdName=俅侠, createdTime=Mon Jun 08 03:16:47 CST 2020, time=2020-06-08, status=1, ipAttribution=)]
    2020-06-08 俅侠

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