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Cell:tRNA碎片或可揭示恶性癌症发生转移之谜

2015-05-12 佚名 生物谷

很多年来科学家们一直非常好奇,不管是细菌还是哺乳动物(包括人类)为何其机体中的小段遗传物质总是“漂浮”在各式各样的细胞中,这些片段携带着细胞的遗传指令,用于制造蛋白质,但其长度太短并不足以发挥其正常的作用;近日一篇刊登在Cell上的研究论文中,来自洛克菲勒大学的科学家就发现了这些遗传片段在机体中扮演重要角色的重要线索,这或为后期开发抵御乳腺癌等疾病的新疗法带来帮助。 研究者Sohail Ta

很多年来科学家们一直非常好奇,不管是细菌还是哺乳动物(包括人类)为何其机体中的小段遗传物质总是“漂浮”在各式各样的细胞中,这些片段携带着细胞的遗传指令,用于制造蛋白质,但其长度太短并不足以发挥其正常的作用;近日一篇刊登在Cell上的研究论文中,来自洛克菲勒大学的科学家就发现了这些遗传片段在机体中扮演重要角色的重要线索,这或为后期开发抵御乳腺癌等疾病的新疗法带来帮助。

研究者Sohail Tavazoie表示,我们发现这些名为转移RNA(tRNA)的小片段遗传物质可以减少乳腺癌细胞的生长和扩散,于是我们就可以利用这一机理来控制乳腺癌的发展;tRNA碎片存在于生命发展的各个阶段,其数量可以持续性地增长,即便细胞暴露于低氧水平及其它细胞压力条件下;但tRNA在机体中的真正目的至今研究者并不清楚,那么这些小的遗传片段到底扮演着什么样的角色呢?

研究者发现当乳腺癌细胞暴露于低氧水平下时就可以产生tRNA碎片,而且携带越多tRNA碎片的癌细胞越不容易发涩还呢个转移,因此研究者就可以将tRNA碎片添加入癌细胞中来减少其生长及转移恶化,但一旦阻断tRNA碎片就会导致完全相反的结果。研究者表示,来自于特殊的tRNAs(谷氨酸、天冬氨酸、甘氨酸及酪氨酸)tRNA碎片可以结合到对癌细胞生命周期尤为重要的癌基因上,正常情况下爱基因会结合其它RNAs并且增加其数量,从而制造更多的爱基因来帮助实现癌细胞的分裂和扩散;但当tRNA碎片结合名为YBX1的癌基因后就会“排挤”编码其它癌基因的RNAs,从而降低癌细胞生长和转移的能力,因此基于以上研究,研究人员或可开发出一类特殊分子来抑制肿瘤的生长。

这些tRNA碎片可以阐明调节基因表达的一个完整的新型途径,Tavazoie说道,通过阻断YBX1结合其它RNA的能力,就可以揭示tRNA碎片在机体表达基因过程中的重要作用及所扮演的角色;tRNA碎片的数量在细胞压力期间会不断增加,比如当细胞暴露于低氧水平下,而此时细胞可以感知其是否没有足够的能量供给,于是tRNA碎片就会开始帮助抑制细胞的生长率从而保证细胞的能量及营养物质在所需要的时候利用。

恶性的乳腺癌细胞往往会另辟蹊径来躲避机体的控制,包括产生tRNA碎片,目前研究者非常感兴趣研究恶性乳腺癌细胞阻断tRNA碎片产生的分子机理,而通过以癌基因的表达被调节作为一种控制癌症的方式,这些癌细胞也会帮助揭示一种新型完整的信号通路,这对于后期开发新型抵御乳腺癌的新型疗法无疑将是一大帮助。

原始出处:

Hani Goodarzi, Xuhang Liu, Hoang C.B. Nguyen, Steven Zhang, Lisa Fish, Sohail F. Tavazoie.Endogenous tRNA-Derived Fragments Suppress Breast Cancer Progression via YBX1 Displacement.Cell, May 7, 2015, 161(4):790-802.DOI: http://dx.doi.org/10.1016/j.cell.2015.02.053

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    2018-04-28 1e19f4d1m16(暂无匿称)

    标记

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  2. [GetPortalCommentsPageByObjectIdResponse(id=310177, encodeId=d18c3101e769, content=标记, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=de0e1989352, createdName=1e19f4d1m16(暂无匿称), createdTime=Sat Apr 28 21:59:16 CST 2018, time=2018-04-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1959359, encodeId=5359195935945, 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=Tue Oct 06 10:04:00 CST 2015, time=2015-10-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869108, encodeId=ed691869108a7, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=70, 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 Feb 02 17:04:00 CST 2016, time=2016-02-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=23584, encodeId=b3f023584d1, content=错别字也太多了吧,发之前能不能检查下。。。, beContent=null, objectType=article, channel=null, level=null, likeNumber=108, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=42a41624971, createdName=Kingday, createdTime=Fri May 15 11:00:00 CST 2015, time=2015-05-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1486554, encodeId=5d18148655457, content=<a href='/topic/show?id=cd401e84239' target=_blank style='color:#2F92EE;'>#tRNA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=80, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=17842, encryptionId=cd401e84239, topicName=tRNA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=89bf8152050, createdName=liao1622, createdTime=Thu May 14 00:04:00 CST 2015, time=2015-05-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=23383, encodeId=c5a0233831b, content=看看, beContent=null, objectType=article, channel=null, level=null, likeNumber=135, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ee0d1618732, createdName=huaxipanxing, createdTime=Wed May 13 21:01:00 CST 2015, time=2015-05-13, status=1, ipAttribution=)]
    2015-10-06 维他命
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    2015-05-15 Kingday

    错别字也太多了吧,发之前能不能检查下。。。

    0

  5. [GetPortalCommentsPageByObjectIdResponse(id=310177, encodeId=d18c3101e769, content=标记, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=de0e1989352, createdName=1e19f4d1m16(暂无匿称), createdTime=Sat Apr 28 21:59:16 CST 2018, time=2018-04-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1959359, encodeId=5359195935945, 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=Tue Oct 06 10:04:00 CST 2015, time=2015-10-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869108, encodeId=ed691869108a7, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=70, 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 Feb 02 17:04:00 CST 2016, time=2016-02-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=23584, encodeId=b3f023584d1, content=错别字也太多了吧,发之前能不能检查下。。。, beContent=null, objectType=article, channel=null, level=null, likeNumber=108, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=42a41624971, createdName=Kingday, createdTime=Fri May 15 11:00:00 CST 2015, time=2015-05-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1486554, encodeId=5d18148655457, content=<a href='/topic/show?id=cd401e84239' target=_blank style='color:#2F92EE;'>#tRNA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=80, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=17842, encryptionId=cd401e84239, topicName=tRNA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=89bf8152050, createdName=liao1622, createdTime=Thu May 14 00:04:00 CST 2015, time=2015-05-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=23383, encodeId=c5a0233831b, content=看看, beContent=null, objectType=article, channel=null, level=null, likeNumber=135, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ee0d1618732, createdName=huaxipanxing, createdTime=Wed May 13 21:01:00 CST 2015, time=2015-05-13, status=1, ipAttribution=)]
    2015-05-14 liao1622
  6. [GetPortalCommentsPageByObjectIdResponse(id=310177, encodeId=d18c3101e769, content=标记, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=de0e1989352, createdName=1e19f4d1m16(暂无匿称), createdTime=Sat Apr 28 21:59:16 CST 2018, time=2018-04-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1959359, encodeId=5359195935945, 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=Tue Oct 06 10:04:00 CST 2015, time=2015-10-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869108, encodeId=ed691869108a7, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=70, 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 Feb 02 17:04:00 CST 2016, time=2016-02-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=23584, encodeId=b3f023584d1, content=错别字也太多了吧,发之前能不能检查下。。。, beContent=null, objectType=article, channel=null, level=null, likeNumber=108, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=42a41624971, createdName=Kingday, createdTime=Fri May 15 11:00:00 CST 2015, time=2015-05-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1486554, encodeId=5d18148655457, content=<a href='/topic/show?id=cd401e84239' target=_blank style='color:#2F92EE;'>#tRNA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=80, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=17842, encryptionId=cd401e84239, topicName=tRNA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=89bf8152050, createdName=liao1622, createdTime=Thu May 14 00:04:00 CST 2015, time=2015-05-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=23383, encodeId=c5a0233831b, content=看看, beContent=null, objectType=article, channel=null, level=null, likeNumber=135, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ee0d1618732, createdName=huaxipanxing, createdTime=Wed May 13 21:01:00 CST 2015, time=2015-05-13, status=1, ipAttribution=)]
    2015-05-13 huaxipanxing

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