Free Radic Biol Med:p47phox是Nrf2功能新型调节剂,利于抑制肺炎

2017-10-26 MedSci MedSci原创

ROS(活性氧)是体内一类氧的单电子还原产物,,是电子在未能传递到末端氧化酶之前漏出呼吸链并消耗大约2%的氧生成的,包括氧的一电子还原产物超氧阴离子(O2·-)、二电子还原产物过氧化氢(H2O2)、三电子还原产物羟基自由基(·OH)以及一氧化氮等。

ROS(活性氧)是体内一类氧的单电子还原产物,是电子在未能传递到末端氧化酶之前漏出呼吸链并消耗大约2%的氧生成的,包括氧的一电子还原产物超氧阴离子(O2·-)、二电子还原产物过氧化氢(H2O2)、三电子还原产物羟基自由基(·OH)以及一氧化氮等。机体内的ROS并不总是有害的,它对机体也有有利的一面。例如,机体内吞噬细胞在细胞膜受到刺激时,通过呼吸暴发机制,产生大量ROS,ROS是吞噬细胞发挥吞噬和杀伤作用的主要介质,但是在病理条件下,由于ROS的产生和清除失去了正常平衡,并且它们对靶点不加区分,常常会对人体造成损伤。研究提示,Nrf2增加诱导抗氧化酶表达,使ROS无效,ROS激活Nrf2是一个关键的抵御ROS的有害影响的负调节步骤。

研究人员推测随着ROS激活Nrf2,NADPH氧化酶组分也参与Nrf2的直接激活,利于保护机体免受ROS的危害。研究结果表明,p47phox是Nrf2功能的新型调节剂。

其中,NADPH氧化酶的p47phox,而不是p65phox或p40phox,能够物理结合Nrf2,激活Nrf2功能。P47phox结合Nrf2/Keap1复合物抑制Nrf2的泛素化,而p47phox由Keap1泛素化。P47phox增加Nrf2的核易位和Nrf2依赖基因的表达,而p47phox的基因消融降低了这些基因的表达。在脂多糖诱导的急性肺炎小鼠模型中,小鼠肺中p47phox的选择性表达诱导Nrf2依赖性基因的表达,从而抑制肺炎。

原始出处:

Ha Kim K, et al. Suppressed ubiquitination of Nrf2 by p47phox contributes to Nrf2 activation. Free Radic Biol Med. 2017 Sep 19;113:48-58. doi: 10.1016/j.freeradbiomed.2017.09.011.

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    2018-04-16 jeanqiuqiu
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    2017-12-04 sunylz
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    2017-11-01 yfjms

    学习了

    0

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    2017-10-28 minzju5053
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  7. [GetPortalCommentsPageByObjectIdResponse(id=1858814, encodeId=86bc18588148d, content=<a href='/topic/show?id=e0a9593596' target=_blank style='color:#2F92EE;'>#DIC#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5935, encryptionId=e0a9593596, topicName=DIC)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6f7770, createdName=jeanqiuqiu, createdTime=Mon Apr 16 12:15:00 CST 2018, time=2018-04-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1767288, encodeId=9ca11e672884c, content=<a href='/topic/show?id=64f5343e2f' target=_blank style='color:#2F92EE;'>#Biol#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=32, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=3437, encryptionId=64f5343e2f, topicName=Biol)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=446937890434, createdName=12498ebem31暂无昵称, createdTime=Sun Aug 19 05:15:00 CST 2018, time=2018-08-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1917741, encodeId=1328191e74120, content=<a href='/topic/show?id=4f26341994' target=_blank style='color:#2F92EE;'>#Bio#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=3419, encryptionId=4f26341994, topicName=Bio)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=12de429, createdName=sunylz, createdTime=Mon Dec 04 05:15:00 CST 2017, time=2017-12-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=257694, encodeId=d5b625e69406, content=学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3da1990174, createdName=yfjms, createdTime=Wed Nov 01 07:14:22 CST 2017, time=2017-11-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1407699, encodeId=780f140e699a3, content=<a href='/topic/show?id=7ee51303e38' target=_blank style='color:#2F92EE;'>#Nrf2#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13037, encryptionId=7ee51303e38, topicName=Nrf2)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c1842706563, createdName=minzju5053, createdTime=Sat Oct 28 04:15:00 CST 2017, time=2017-10-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1608162, encodeId=6ad51608162a8, content=<a href='/topic/show?id=eb6b1145939' target=_blank style='color:#2F92EE;'>#Med#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11459, encryptionId=eb6b1145939, topicName=Med)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=552a19396740, createdName=ms3994565386320060, createdTime=Sat Oct 28 04:15:00 CST 2017, time=2017-10-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=256336, encodeId=e2ef256336ca, content=学习学习.了解了解, beContent=null, objectType=article, channel=null, level=null, likeNumber=64, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=93f31631454, createdName=1dd8c52fm63(暂无匿称), createdTime=Fri Oct 27 08:47:02 CST 2017, time=2017-10-27, status=1, ipAttribution=)]
    2017-10-27 1dd8c52fm63(暂无匿称)

    学习学习.了解了解

    0

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