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Nature:西班牙科学家发现肿瘤转移关键分子

2016-12-11 科学网 孙学军 科学网 孙学军

最新动物实验结果表明,癌细胞转移需要脂肪提高能源,这一发现给癌症转移的治疗带来新的策略。正常组织细胞一旦从原位脱离往往会启动自杀程序,不会带来对躯体的危害。癌细胞转移是癌症恶变的典型特征,也是患者死亡的关键。癌细胞转移对癌症细胞来说也是非常艰巨的任务,癌细胞转移过程包括从原位组织脱离,进入血液和淋巴等转移到身体其它部位,在完全不同的区域重新生长形成肿块。科学家一直在努力理解癌细胞转移的启动信号和具

最新动物实验结果表明,癌细胞转移需要脂肪提高能源,这一发现给癌症转移的治疗带来新的策略。


正常组织细胞一旦从原位脱离往往会启动自杀程序,不会带来对躯体的危害。癌细胞转移是癌症恶变的典型特征,也是患者死亡的关键。癌细胞转移对癌症细胞来说也是非常艰巨的任务,癌细胞转移过程包括从原位组织脱离,进入血液和淋巴等转移到身体其它部位,在完全不同的区域重新生长形成肿块。



科学家一直在努力理解癌细胞转移的启动信号和具体细节。2016年12月7日Nature发表的论文中确定了一类口腔肿瘤细胞如何实现转移的步骤,其中关键过程是这些肿瘤细胞转移需要的能量要依靠脂肪来提供。未参加该研究的休斯顿贝勒医学院癌症学家Xiang Zhang说,确定癌症转移过程,也就是癌症恶变过程的程序十分重要。

西班牙巴塞罗那理工学院Salvador Aznar Benitah等,通过对潜在具有转移能力的癌细胞进行研究,发现口腔癌症细胞中一些表达高水平CD36的细胞。CD36是一种脂肪酸受体,负责脂肪酸的识别和细胞跨膜转运,CD36能帮助肿瘤细胞从周围环境中摄取脂肪分子,这些脂肪分子成为这些细胞转移的能量来源。他们认为,肿瘤细胞转移需要大量额外能量,这些细胞能从环境中摄取脂肪使之具有了转移的能力。芝加哥大学妇科肿瘤学家Ernst Lengyel说:“转移需要大量的能量,癌细胞必须能够适应不断变化的环境,重新改变基因表达模式,建立滩头阵地并迅速开始增殖。”
Benitah等发现,小鼠体内转移的癌症细胞需要CD36的高表达,利用抗体阻断CD36与脂肪酸的结合就可以完全抑制肿瘤细胞的转移。但是这种抗体不会影响原位癌症的生长。

研究人员通过挖掘公共数据库,发现许多人类癌症如膀胱、肺癌、乳腺癌高表达CD36与恶劣预后存在相关关系,这提示这些癌症也存在类似的情况。Benitah团队正在努力开发CD36抗体药物,争取早日用于临床研究,初步估计4年后可以达到这一目标。Benitah指出,这是癌症细胞转移的针对性治疗策略,小鼠实验中这种抗体可以消除15%,剩余的转移肿瘤细胞也萎缩了80%以上。
团队也在思考另一个现象,给小鼠喂养高脂饮食导致肿瘤增长速度加快,有更多的淋巴结和肺转移现象。Benitah团队正在进行一项研究,计划招募1000人类癌症患者,通过分析这些患者血液中脂肪酸类型,寻找那些促进癌症转移的脂肪酸类型。根据现在的研究结果,建议人们控制脂肪类食物仍然为时过早,而且癌症患者往往需要更多热量维持生命,建议控制脂肪饮食可能适得其反。

原始出处:

Gloria Pascual,et al. Targeting metastasis-initiating cells through the fatty acid receptor CD36. Nature. 07 December 2016.

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    2017-07-22 liye789132251
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    2016-12-13 xzw115
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    2016-12-12 天仙居

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  6. [GetPortalCommentsPageByObjectIdResponse(id=1881502, encodeId=99891881502c5, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Sat Jul 22 18:17:00 CST 2017, time=2017-07-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1802364, encodeId=0b7e1802364ca, content=<a href='/topic/show?id=acfae485578' target=_blank style='color:#2F92EE;'>#科学家发现#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=36, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=74855, encryptionId=acfae485578, topicName=科学家发现)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e572480, createdName=旅苦化文_208, createdTime=Fri Nov 03 15:17:00 CST 2017, time=2017-11-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1291629, encodeId=838a1291629c5, content=<a href='/topic/show?id=137a831151a' target=_blank style='color:#2F92EE;'>#肿瘤转移#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=77, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=83115, encryptionId=137a831151a, topicName=肿瘤转移)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=1be8234, createdName=sunyl07, createdTime=Tue Dec 13 10:17:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1461312, encodeId=0cec1461312cf, content=<a href='/topic/show?id=67356e62003' target=_blank style='color:#2F92EE;'>#牙科#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=59, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=67620, encryptionId=67356e62003, topicName=牙科)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=2d786418402, createdName=xzw115, createdTime=Tue Dec 13 10:17:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=162297, encodeId=dc4416229e8e, content=顶, beContent=null, objectType=article, channel=null, level=null, likeNumber=74, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=88ff1949572, createdName=天仙居, createdTime=Mon Dec 12 23:58:23 CST 2016, time=2016-12-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=162001, encodeId=dbd7162001e5, content=优秀, beContent=null, objectType=article, channel=null, level=null, likeNumber=69, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20161001/IMG57EE8DCCA0CBC2639.jpg, createdBy=88e51960023, createdName=陈安安, createdTime=Sun Dec 11 19:24:21 CST 2016, time=2016-12-11, status=1, ipAttribution=)]
    2016-12-11 陈安安

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