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Cell Res:破冰!推广脐带血治疗成人疾病指日可待

2018-08-06 小通 生物通

来自Stowers医学研究所的科学家们发现了从人类脐带血扩增造血干细胞的新方法,这项技术将极大地促进缺乏适合骨髓配型的白血病、血液病、免疫系统疾病和癌症等成人患者的干细胞治疗。


来自Stowers医学研究所的科学家们发现了从人类脐带血扩增造血干细胞的新方法,这项技术将极大地促进缺乏适合骨髓配型的白血病、血液病、免疫系统疾病和癌症等成人患者的干细胞治疗。

“几十年来,骨髓移植是挽救生命的常见操作,然而,并非所有患者都有条件做骨髓移植,”癌症生物学项目领导者Linheng Li博士说。

根据美国卫生和人类服务部数据,全美只有30%患者能在家族中找到合适的骨髓配型,根据美国癌症协会数据,预计美国超过170000人将被确诊为血癌(白血病、淋巴瘤或骨髓瘤)。

脐带血中的成体干细胞的兼容性更高,更容易找到合适的配型。但是,对一个成人患者来说,至少需要2条脐带才能满足血液治疗需要,缺乏足够单位脐带是阻碍脐带血干细胞移植的一大瓶颈。

“如果我们可以拓展脐带血中的成体干细胞,就能减少每次治疗所需的脐带条数,摆在我们面前的是一个巨大的优势,”Li说。

据7月31日他们发表在《Cell Research》的这项研究,他们将注意力集中在影响造血干细胞自我更新的多个靶点和途径上的蛋白,相比过去只研究单一靶点或途径,这项研究的关注范围更广。这促使研究人员发现,一个名为Ythdf2的蛋白质可以识别一组编码干细胞自我更新相关关键转录因子的mRNA的特定修饰,它的存在促进了这些mRNA在细胞内的衰减。

当课题组敲除小鼠模型Ythdf2功能或单独敲除hUCB细胞的Ythdf2功能时,转录因子表达量升高,造血干细胞(hUCB中成体干细胞的主要类型)出现扩增。他们观察到,损害Ythdf2功能并不会影响干细胞生产的细胞类型,也不会导致血细胞恶性肿瘤增加。此外,敲除治疗不是永久性的,这意味着移植后Ythdf2功能是可以恢复的。

“我们使用的是以RNA为基础的靶向Ythdf2功能技术,这有助于避免更持久的DNA相关变异,如表观遗传调节器突变,”文章一作Zhenrui Li博士说。

Zhenrui Li解释,基因突变可能导致白血病或癌症复发,由于Ythdf2蛋白存在于不同类型的成体干细胞中,靶向它和它影响造血干细胞的方式似乎是一种更安全的方法,如果被进一步证明有效,将具有广泛适用性。

Linheng Li认为,这种方法可能会应用到其他类型的成体干细胞中,帮助扩大成体干细胞数量,以达到治疗人类患者标准。它可以与单倍体成人干细胞移植法相辅相成,在捐献者虽然是患者的直系亲属,但配型并不成功的情况下,目前这些患者通常需要免疫抑制剂治疗来抑制抗宿主病。

“脐带血能可靠地扩增成体干细胞,而不是将细胞直接分化成成熟的和相对短命的血细胞,这项研究为我们指出了一条前进的道路,”堪萨斯大学卫生系统血液和骨髓移植医学主任Joseph McGuirk教授说,他并没有参与本研究。“这是该领域的一项重大进展。可改善每年数千名儿童和成人接受脐带血移植治疗。”

原始出处:

Zhenrui Li, et al.Suppression of m6A reader Ythdf2 promotes hematopoietic stem cell expansion.Cell Research, 1–14 Rights & permissions.July 2018

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    2018-08-07 chinadoctorliu_19344479

    这个还真有意思

    0

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    2018-08-06 ylzr123

    好文,值得点赞!认真学习了,把经验应用于实践,为患者解除病痛。

    0

  8. [GetPortalCommentsPageByObjectIdResponse(id=1961068, encodeId=cf0619610688f, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=72, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Sun Oct 14 13:36:00 CST 2018, time=2018-10-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1870799, encodeId=e2ec18e07993d, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Tue Oct 30 18:36:00 CST 2018, time=2018-10-30, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1355159, encodeId=af7d135515904, content=<a href='/topic/show?id=3b47846692b' target=_blank style='color:#2F92EE;'>#脐带血#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=68, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=84669, encryptionId=3b47846692b, topicName=脐带血)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=zhaojie88, createdTime=Wed Aug 08 11:36:00 CST 2018, time=2018-08-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1542398, encodeId=830a154239809, content=<a href='/topic/show?id=82c0846654a' target=_blank style='color:#2F92EE;'>#脐带#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=70, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=84665, encryptionId=82c0846654a, topicName=脐带)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f06713409761, createdName=1249859em42(暂无昵称), createdTime=Wed Aug 08 11:36:00 CST 2018, time=2018-08-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1587379, encodeId=995a158e379d4, content=<a href='/topic/show?id=7e9a56e67a0' target=_blank style='color:#2F92EE;'>#推广#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=117, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=56767, encryptionId=7e9a56e67a0, topicName=推广)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=dff417466583, createdName=zhangxingru, createdTime=Wed Aug 08 11:36:00 CST 2018, time=2018-08-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=336982, encodeId=634c336982b0, content=这个还真有意思, beContent=null, objectType=article, channel=null, level=null, likeNumber=180, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2018/08/06/a313b29462d38919a70f6ff00472d6b4.jpg, createdBy=86572414239, createdName=chinadoctorliu_19344479, createdTime=Tue Aug 07 07:18:18 CST 2018, time=2018-08-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=336896, encodeId=f5b7336896d3, content=好文,值得点赞!认真学习了,把经验应用于实践,为患者解除病痛。, beContent=null, objectType=article, channel=null, level=null, likeNumber=107, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7s7ZCKOmmbBTD6nE7gcd5OZpvyGEzkxBP3S275k5ZJVrsPkotZhBglRHM9rKvcj1OgkssqhcnoPw8zIaMZTF8c/0, createdBy=4c441942088, createdName=ylzr123, createdTime=Mon Aug 06 22:24:45 CST 2018, time=2018-08-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=336887, encodeId=a95133688e0a, content=厉害了!, beContent=null, objectType=article, channel=null, level=null, likeNumber=175, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2018/04/29/6566d3ba9f44e0ed586bf56437c16db3.jpg, createdBy=24c12049526, createdName=chenweilong, createdTime=Mon Aug 06 22:00:52 CST 2018, time=2018-08-06, status=1, ipAttribution=)]
    2018-08-06 chenweilong

    厉害了!

    0

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