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Cell:维生素C可能促使血癌干细胞死亡,有望抗白血病

2017-08-18 佚名 medicalxpress

维生素C可以“告知”骨髓中的有缺陷的干细胞成熟并正常死亡,而不是倍增引起血液癌。这是由纽约大学Langone Health Perlmutter癌症中心的研究人员领导的一项研究的发现,并于8月17日在“Cell”杂志上发表。

维生素C可以“告知”骨髓中的有缺陷的干细胞成熟并正常死亡,而不是倍增引起血液癌。这是由纽约大学Langone Health Perlmutter癌症中心的研究人员领导的一项研究的发现,并于8月17日在“Cell”杂志上发表。


作者说,在许多患有某些白血病的患者中某些遗传变化已知会降低称为TET2的酶的能力,以鼓励干细胞成为成熟的血细胞,最终死亡。新研究发现维生素C在缺乏酶的小鼠中能够活化TET2功能。

相应的研究作者Benjamin G. Neel说:“高剂量维生素C可能成为TET2缺陷性白血病干细胞引起的血液疾病的安全治疗,最有可能与其他靶向治疗相结合的前景令我们感到兴奋。”

在10%的急性骨髓性白血病(AML)患者中发现了减少TET2功能的遗传密码(突变)的变化,30%的具有称为骨髓增生异常综合征的前白血病形式的患者,以及近50%的患有慢性骨髓单核细胞白血病。这样的癌症导致贫血,感染风险和出血,因为异常干细胞在骨髓中繁殖,直到它们干扰血细胞生成,随着人群数量的增加,病例数量增加。

作者认为,随着这些疾病的发展,新的检测结果表明,美国所有癌症患者中约有2.5%(即每年大约42,500名新患者)可能会出现TET2突变(包括淋巴瘤和实体瘤)。

细胞死亡开关

研究结果围绕着TET2与胞嘧啶之间的关系,四核苷酸是包含基因DNA代码的四个核酸“字母”之一。每个细胞类型具有相同的基因,但是每个细胞类型都具有不同的指令,以仅打开给定细胞背景中需要的那些。

这些“表观遗传学”调节机制包括DNA甲基化,称为甲基的小分子与胞嘧啶碱基的连接,其关闭含有它们的基因的作用。

甲基的前后连接和除去也可以调节干细胞中的基因表达,干细胞可以成熟,专门化并繁殖成为肌肉,骨骼,神经或其他细胞类型。但是骨髓也将保持干细胞池成熟,准备根据需要成为替代细胞。在白血病中,通常会告诉血液干细胞成熟的信号,使其不断繁殖和“自我更新”,而不是产生与感染相抵消的正常白细胞。

在本报告中研究的酶,Tet甲基胞嘧啶双加氧酶2(TET2)能使甲基的分子结构(氧化)发生变化,这些甲基被从胞嘧啶中除去。这种“去甲基化”导致干细胞直接成熟的基因,并开始反向自我毁灭作为正常工作的一部分。 Neel说,这是一种抗癌安全性机制,在TET2突变的血液癌患者中被破坏。

为了确定在异常干细胞中减少TET2功能的突变的影响,研究小组对小鼠进行了遗传改造,使得科学家们可以开启或关闭TET2基因。

类似于TET2突变在小鼠或人类中的天然存在的影响,可以使用分子生物学技术来关闭小鼠中的TET2引起异常的干细胞行为。值得注意的是,当TET2表达被遗传技术恢复时,这些变化是相反的。以前的工作表明,维生素C可以刺激TET2及其亲属TET1和TET3的活性。因为每个干细胞中TET2基因的两个拷贝中只有一个拷贝通常在TET2突变体血液疾病中受到影响,所以作者假设高剂量的维生素C只能静脉注射,可能会逆转TET2缺陷的作用提高剩余功能基因的作用。

事实上,他们发现维生素C与遗传上恢复TET2功能相同。通过促进DNA去甲基化,大剂量维生素C治疗诱导干细胞成熟,并且还抑制了植入小鼠的人类患者的白血病癌症干细胞的生长。

“有趣的是,我们还发现维生素C治疗对白血病干细胞具有类似于DNA损伤的作用,”首席研究人员Luisa Cimmino博士说。 “因此,我们决定将维生素C与PARP抑制剂(一种已知通过阻断DNA损伤修复引起癌细胞死亡的药物)相结合,并已经批准用于治疗某些卵巢癌患者。”

研究人员发现,这种组合对白血病干细胞的作用增强,进一步将其从自我更新转向成熟和细胞死亡。结果还表明,Cimmino说,维生素C可能驱动没有TET2突变的白血病干细胞死亡,因为它可以使任何TET2活性到位。

相应的作者Iannis Aifantis博士,纽约大学兰贡健康病理学系教授兼主任说:“我们的团队正在努力系统地鉴定遗传变化,从而有助于白血病患者的治疗。 “本研究将异常TET2驱动的DNA去甲基化的靶点添加到我们潜在的新治疗方法列表中。”
原始出处:
Luisa Cimmino,Igor Dolgalev,Akihide Yoshimi.et al.Restoration of TET2 Function Blocks Aberrant Self-Renewal and Leukemia Progression.Cell

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    2018-06-10 维他命
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    2017-09-09 colleenld

    总量有参考吗?

    0

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    2017-08-24 方舒

    学习

    0

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  6. [GetPortalCommentsPageByObjectIdResponse(id=1960391, encodeId=7181196039187, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, 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 Jun 10 22:48:00 CST 2018, time=2018-06-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1870131, encodeId=e9b118e0131b2, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Sun Mar 18 23:48:00 CST 2018, time=2018-03-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=242285, encodeId=7225242285fc, content=总量有参考吗?, beContent=null, objectType=article, channel=null, level=null, likeNumber=131, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTL4bZibSxNmZ2cwRHIWMqW3XrRJuaEXN59AmibCl2qNAPCTmFGs2UcUyc5O5Qib4zwkZ8OiczoFD2QpcA/0, createdBy=bb1d2145213, createdName=colleenld, createdTime=Sat Sep 09 22:26:34 CST 2017, time=2017-09-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=236818, encodeId=c5012368180f, content=学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=92, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib06iaV3D9Tg5KiblTyxD95ExbzUoCVcRuhPibXboL28wicFMTXUhCA0RWCyQZYC5Na3ap7CxjialMkB50VEJ0XToQQTC/0, createdBy=470c1945776, createdName=方舒, createdTime=Thu Aug 24 23:42:52 CST 2017, time=2017-08-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1544981, encodeId=b4e61544981ff, content=<a href='/topic/show?id=7a0fe1289c2' target=_blank style='color:#2F92EE;'>#癌干细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=81, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=71289, encryptionId=7a0fe1289c2, topicName=癌干细胞)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=340013676140, createdName=1249898am19暂无昵称, createdTime=Sun Aug 20 02:48:00 CST 2017, time=2017-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1589577, encodeId=f38715895e7a8, content=<a href='/topic/show?id=8b378949642' target=_blank style='color:#2F92EE;'>#血癌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=80, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=89496, encryptionId=8b378949642, topicName=血癌)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=8db117750430, createdName=liuhuangbo, createdTime=Sun Aug 20 02:48:00 CST 2017, time=2017-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=234771, encodeId=1e7a234e718d, content=很好的文章,学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=96, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/Q3auHgzwzM4o2XVpJ6449yqDsjibydI5HnJ8MibGxNn4HZiaZib0bdfibbwoz3KQrIyN9AGxq36ZlZRNicYlPfOOWMtwgsajY6mGNFiaPclFdowjD0/0, createdBy=97bd1338592, createdName=清风拂面, createdTime=Fri Aug 18 14:51:32 CST 2017, time=2017-08-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=234760, encodeId=07a8234e603d, content=很好,不错,以后会多学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=146, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzUn81b5CF5ibVPib8jWI92iciaxmqGHlwruOnK4SVZykd4iahqo1hicklIibyZoxm55X7EM8BW9eX1h1hQ2/0, createdBy=8aa81937526, createdName=李东泽, createdTime=Fri Aug 18 12:39:29 CST 2017, time=2017-08-18, status=1, ipAttribution=)]
    2017-08-20 liuhuangbo
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    2017-08-18 清风拂面

    很好的文章,学习了

    0

  8. [GetPortalCommentsPageByObjectIdResponse(id=1960391, encodeId=7181196039187, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, 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 Jun 10 22:48:00 CST 2018, time=2018-06-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1870131, encodeId=e9b118e0131b2, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Sun Mar 18 23:48:00 CST 2018, time=2018-03-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=242285, encodeId=7225242285fc, content=总量有参考吗?, beContent=null, objectType=article, channel=null, level=null, likeNumber=131, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTL4bZibSxNmZ2cwRHIWMqW3XrRJuaEXN59AmibCl2qNAPCTmFGs2UcUyc5O5Qib4zwkZ8OiczoFD2QpcA/0, createdBy=bb1d2145213, createdName=colleenld, createdTime=Sat Sep 09 22:26:34 CST 2017, time=2017-09-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=236818, encodeId=c5012368180f, content=学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=92, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib06iaV3D9Tg5KiblTyxD95ExbzUoCVcRuhPibXboL28wicFMTXUhCA0RWCyQZYC5Na3ap7CxjialMkB50VEJ0XToQQTC/0, createdBy=470c1945776, createdName=方舒, createdTime=Thu Aug 24 23:42:52 CST 2017, time=2017-08-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1544981, encodeId=b4e61544981ff, content=<a href='/topic/show?id=7a0fe1289c2' target=_blank style='color:#2F92EE;'>#癌干细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=81, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=71289, encryptionId=7a0fe1289c2, topicName=癌干细胞)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=340013676140, createdName=1249898am19暂无昵称, createdTime=Sun Aug 20 02:48:00 CST 2017, time=2017-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1589577, encodeId=f38715895e7a8, content=<a href='/topic/show?id=8b378949642' target=_blank style='color:#2F92EE;'>#血癌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=80, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=89496, encryptionId=8b378949642, topicName=血癌)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=8db117750430, createdName=liuhuangbo, createdTime=Sun Aug 20 02:48:00 CST 2017, time=2017-08-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=234771, encodeId=1e7a234e718d, content=很好的文章,学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=96, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/Q3auHgzwzM4o2XVpJ6449yqDsjibydI5HnJ8MibGxNn4HZiaZib0bdfibbwoz3KQrIyN9AGxq36ZlZRNicYlPfOOWMtwgsajY6mGNFiaPclFdowjD0/0, createdBy=97bd1338592, createdName=清风拂面, createdTime=Fri Aug 18 14:51:32 CST 2017, time=2017-08-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=234760, encodeId=07a8234e603d, content=很好,不错,以后会多学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=146, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzUn81b5CF5ibVPib8jWI92iciaxmqGHlwruOnK4SVZykd4iahqo1hicklIibyZoxm55X7EM8BW9eX1h1hQ2/0, createdBy=8aa81937526, createdName=李东泽, createdTime=Fri Aug 18 12:39:29 CST 2017, time=2017-08-18, status=1, ipAttribution=)]
    2017-08-18 李东泽

    很好,不错,以后会多学习

    0

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