science子刊:免疫治疗新突破!CD47抗体有望治疗5种恶性儿童脑瘤

2017-04-04 王新凯 奇点网

如果患了感冒,很多人都会说,多喝水过几天就好了。那如果患了癌症呢?我们的免疫系统为什么没有将「不正常」的癌细胞「正常」消灭?科学家发现,癌细胞的「狡猾」之处,在于它极善「伪装」。因此,如果能够通过某种办法,阻止癌细胞的「伪装」,也就有可能像对待感冒一样将癌症治愈。近年来,这种癌症的免疫疗法,已经成为生物科学领域的研究热点。

如果患了感冒,很多人都会说,多喝水过几天就好了。那如果患了癌症呢?我们的免疫系统为什么没有将「不正常」的癌细胞「正常」消灭?科学家发现,癌细胞的「狡猾」之处,在于它极善「伪装」。因此,如果能够通过某种办法,阻止癌细胞的「伪装」,也就有可能像对待感冒一样将癌症治愈。近年来,这种癌症的免疫疗法,已经成为生物科学领域的研究热点。

最近,斯坦福大学研究人员开发出的一种抗体,通过阻断癌细胞发出的「伪装」信号,引发巨噬细胞对癌细胞的吞噬作用。目前这个药物在动物体内被证明可以安全、有效地治疗五种恶性儿童脑瘤。最新的研究成功发表在《科学》子刊《转化医学》杂志上。

癌细胞本身作为一种变异的细胞,细胞表面的特殊蛋白,会向我们的免疫系统传递一种「吃我」的信号(对于一些老化的红细胞,也会发出这种「吃我」的自我毁灭信号)。我们身体中的免疫系统就是根据这种信号,识别出哪些是需要消灭的对象。但是大部分情况下,癌细胞都会通过「伪装」,逃避免疫系统的监视。科学家已经发现,大部分的癌细胞表面都存在一种CD47蛋白的过表达,包括各种实体瘤和血液肿瘤。进一步的研究发现,CD47蛋白正是通过传递一种「不要吃我」的信号,来避免巨噬细胞的吞噬作用。



癌细胞表面的CDs47与信号调节蛋白α相互作用,向巨噬细胞传递出“不要吃我”的信号

信号调节蛋白α(SIRPα),是CD47的一种重要表面受体。CD47和SIRPα结合后,向巨噬细胞传递出抑制信号,避免了吞噬作用的发生。CD47-SIRPα信号通路的发现,给研究癌症治疗的科学家们提供了一个具体的突破口。去年,斯坦福大学成立了一家名为Forty Seven的公司,专门开发阻断CD47-SIRPα信号通路的靶向药物。成立之初,Forty Seven公司便获得Alphabet(谷歌母公司)和Sutter Hill Ventures7500万美元的风险投资。

研究人员开发的抗CD47抗体Hu5F9-G4,能够阻断CD47蛋白与SIRPα的结合,从而也阻断了癌细胞的「不要吃我」信号。虽然正常细胞的「不要吃我」信号通路也会被抗体阻断,但是这并不会因此而引起巨噬细胞的攻击,因为健康的细胞本身就缺乏「吃我」信号表达。而癌细胞表面的「吃我」信号,是一直就存在的,只不过在抗体Hu5F9-G4的作用下,就有了出头之日。



抗CD47抗体阻断“不要吃我”通路,引发吞噬作用

这次研究人员选取的五种恶性儿童脑瘤分别是三型髓母细胞瘤(MB)、非典型畸胎样横纹肌样瘤(ATRT)、原发性原始神经外胚层瘤(PNET)、儿童胶质母细胞瘤(GBM)和弥漫性真性脑桥神经胶质瘤(DIPG)。这五种儿童脑瘤,要么是极具侵袭性、致命性,要么是恶性程度极高、难以治疗和预后极差,常规的治疗手段往往还会对发育中的大脑造成不可预知的伤害。「对于许多这样的肿瘤来说,根本没有治疗的手段。」研究团队的Samuel Cheshier教授说,「确诊就等同于是死亡判决。」

但是研究人员通过实验发现,对于这五种儿童脑瘤,抗体Hu5F9-G4有着非常活跃的肿瘤杀伤效果,对肿瘤的生长和转移均表现出显着抑制。在对移植了神经胶质瘤的小鼠试验中,低剂量和高剂量Hu5F9-G4将小鼠的平均存活期分别从21天延长至32和38天。

斯坦福大学医学院Cheshier说:「在大脑中进行免疫治疗是一个很大的挑战,目前的一些免疫治疗方法是用T细胞攻击和杀死肿瘤细胞,但是这些细胞裂解所释放的内容物会进一步刺激免疫系统,引起十分严重的炎症反应。并且因为脑肿瘤被颅骨所限制,所以这种肿胀会严重影响脑功能。」

而抗体Hu5F9-G4引发的吞噬作用,是一种先天性免疫,巨噬细胞可以完全将癌细胞吞噬,而不会像杀伤性T细胞治疗那样产生严重的副作用。

实验结果同时显示,Hu5F9-G4对正常神经祖细胞(具有分化为各种类型细胞的能力)的存活和增殖没有产生影响。这意味着,通过Hu5F9-G4治疗儿童脑瘤,能够避免对儿童大脑发育的不利影响。

研究人员表示,接下来他们会尝试将抗体Hu5F9-G4与其他癌症疗法结合使用,来最大限度地发挥其作用。

鉴于之前Forty Seven公司已经针对成人患者就抗体Hu5F9-G4进行了早期临床研究(NCT02216409),并取得了令人鼓舞的结果,抗体Hu5F9-G4也有望在一至两年内进入儿童脑瘤的临床试验。相信在不久的将来,抗体Hu5F9-G4会有更多崭露头角的机会。

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    2018-06-10 1e145228m78(暂无匿称)

    学习了.谢谢作者分享!

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    2017-06-18 zxxiang
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    2017-06-25 qidongfanjian
  4. [GetPortalCommentsPageByObjectIdResponse(id=322926, encodeId=4ca93229263f, content=学习了.谢谢作者分享!, beContent=null, objectType=article, channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3xJXLtMtt5B40XXuPjn9xn1rBhrM6fHLkX1hI86ZoWoPJkgDkZuJNKkBfBHOcRd1fAdezg7JlHNOokohdAp3WkI/0, createdBy=32c81964262, createdName=1e145228m78(暂无匿称), createdTime=Sun Jun 10 06:24:02 CST 2018, time=2018-06-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1724923, encodeId=86691e24923db, content=<a href='/topic/show?id=9ee758586bb' target=_blank style='color:#2F92EE;'>#新突破#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=21, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=58586, encryptionId=9ee758586bb, topicName=新突破)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=792a33728807, createdName=zxxiang, createdTime=Sun Jun 18 21:46:00 CST 2017, time=2017-06-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1864220, encodeId=b5af1864220b9, content=<a href='/topic/show?id=f930432538' target=_blank style='color:#2F92EE;'>#CD4#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4325, encryptionId=f930432538, topicName=CD4)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b09892, createdName=qidongfanjian, createdTime=Sun Jun 25 01:46:00 CST 2017, time=2017-06-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=186432, encodeId=7ac718643272, content=谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4Nel6t0yibZpzs7ebia02vqicCibzuDEgS0KrfzepRJ2YxPed0KVoueicRRyRcNuPfy6ZCiaY7Lib04FNicQdGuGI93WUAl5/0, createdBy=4ca92045820, createdName=南宫少天, createdTime=Mon Apr 10 15:28:05 CST 2017, time=2017-04-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1275684, encodeId=448612e5684d4, content=<a href='/topic/show?id=aad38494640' target=_blank style='color:#2F92EE;'>#脑瘤#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=84946, encryptionId=aad38494640, topicName=脑瘤)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=373a131, createdName=jxrzshh, createdTime=Thu Apr 06 02:46:00 CST 2017, time=2017-04-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1375538, encodeId=984613e55385b, content=<a href='/topic/show?id=2949159989d' target=_blank style='color:#2F92EE;'>#SCIE#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15998, encryptionId=2949159989d, topicName=SCIE)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=17a3387, createdName=jichang, createdTime=Thu Apr 06 02:46:00 CST 2017, time=2017-04-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=185150, encodeId=07e11851505d, content=比较好的思路, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=80ca1736230, createdName=为了家庭奋斗, createdTime=Tue Apr 04 18:36:36 CST 2017, time=2017-04-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=185130, encodeId=391418513085, content=好文章。 , beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzfPkmqRTH5rHib5mcib8Wb3QdXjhfOK1UubQL2lictjJFdFJ6Lc3cnnCOSWqxXZ4Kk6y5GdzDoy764R/0, createdBy=156e1644785, createdName=doctorJiangchao, createdTime=Tue Apr 04 15:43:29 CST 2017, time=2017-04-04, status=1, ipAttribution=)]
    2017-04-10 南宫少天

    谢谢分享

    0

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    2017-04-06 jxrzshh
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    2017-04-06 jichang
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    2017-04-04 为了家庭奋斗

    比较好的思路

    0

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    2017-04-04 doctorJiangchao

    好文章。

    0