Toxicol Sci:烟草烟雾中苯并[a]芘对肺上皮细胞具有遗传毒性!

2017-11-18 Emma MedSci原创

烟草烟雾是指吸烟时产生的烟雾。气相成分占总量的92%,主要是一氧化碳、二氧化碳、氮氧化物、挥发性低分子烷烃和烯烃等;固相成分占总量的8%,为粒径0.1-2μm的烟尘,冷凝即为焦油,每支纸烟约产生20-35mg焦油。

烟草烟雾是指吸烟时产生的烟雾。气相成分占总量的92%,主要是一氧化碳、二氧化碳、氮氧化物、挥发性低分子烷烃和烯烃等;固相成分占总量的8%,为粒径0.1-2μm的烟尘,冷凝即为焦油,每支纸烟约产生20-35mg焦油。B[a]P(苯并[a]芘)是一种日常生活或工业生产过程中产生的副产物,属于多环芳烃中毒性最大的一种强烈致癌物,在烟草烟雾中也发现它的存在,会导致吸烟者的肺中出现高水平的DNA加合物。B[a]P能够使染色体错误分离和非整倍性,导致有丝分裂纺锤体装置改变,引起基因组不稳定性。研究人员试图探究B[a]P暴露改变正常肺上皮细胞中的有丝分裂装置的作用机制。

试验研究采用了肺上皮BEAS-2B细胞,暴露于B[a]P。利用共焦成像观察纺锤丝形态,检测有丝分裂纺锤体相关基因的表达情况,使用γ-H2AX研究DNA的损伤情况。

研究发现,B[a]P暴露能够显著导致纺锤体错误定向、染色体滞后、桥梁形式错误分离,中心体复制和过早的中心分离导致错位和多极纺锤体形成,DNA损伤显著。基因组比较分析发现,B[a]P显著影响AurA-Plk1-AurB(有丝分裂纺锤体相关基因)信号通路的作用。B[a]P暴露的细胞中p53和其下游的p21受到抑制。该研究结果表明,B[a]P能够诱导有丝分裂异常,DNA损伤和遗传不稳定性。

原始出处:

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    2017-11-20 mnda
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    2017-11-18 明天会更好!

    好消息.值得学习

    0

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    2017-11-18 明天会更好!

    好消息.值得学习

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=1814329, encodeId=2b19181432983, content=<a href='/topic/show?id=969895183a0' target=_blank style='color:#2F92EE;'>#遗传毒性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=23, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=95183, encryptionId=969895183a0, topicName=遗传毒性)], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyheQLjPSX3OUs5GmkyBlcCOwTPIeq3why9NGibxxUqYo6hcx8qZLHZFgNPnBK1yzWeOFpyg2OnWOt0/0, createdBy=fa4716, createdName=zhouqu_8, createdTime=Mon Apr 23 15:58:00 CST 2018, time=2018-04-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1310192, encodeId=da2213101928f, content=<a href='/topic/show?id=53036e11185' target=_blank style='color:#2F92EE;'>#烟草#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=67111, encryptionId=53036e11185, topicName=烟草)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6a8d381, createdName=mnda, createdTime=Mon Nov 20 07:58:00 CST 2017, time=2017-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1533841, encodeId=7213153384131, content=<a href='/topic/show?id=4be9200308c' target=_blank style='color:#2F92EE;'>#上皮细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=20030, encryptionId=4be9200308c, topicName=上皮细胞)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=3a5d12492718, createdName=lizhou0208, createdTime=Mon Nov 20 07:58:00 CST 2017, time=2017-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=262339, encodeId=d1dd26233914, content=好消息.值得学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=67, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160914/IMG57D82E721DB581755.jpg, createdBy=4fc81933929, createdName=明天会更好!, createdTime=Sat Nov 18 19:38:28 CST 2017, time=2017-11-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=262338, encodeId=08cb262338b8, content=好消息.值得学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=71, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160914/IMG57D82E721DB581755.jpg, createdBy=4fc81933929, createdName=明天会更好!, createdTime=Sat Nov 18 19:38:21 CST 2017, time=2017-11-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=262335, encodeId=c36e26233535, content=非常好的文章.学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=74, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7LIiaRZTzJ3SEfiauCzTMPW7YvPPYLNJBXG9oh6Al1icq2VQQkIHWxqXehcicTS62YKJVBhxeth3wggw/0, createdBy=7ce01621306, createdName=天涯183, createdTime=Sat Nov 18 19:34:18 CST 2017, time=2017-11-18, status=1, ipAttribution=)]
    2017-11-18 天涯183

    非常好的文章.学习了

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