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Cell Rep:如何开启DNA修复 延缓机体衰老和疾病的发生?

2016-09-13 佚名 生物谷

图片来源:www.phys.org 近日,一项刊登在国际杂志Cell Reports上的研究报告中,来自美国罗彻斯特大学的研究人员在寻找激活SIRT6的机制时,他们将化学抑制剂应用于人类皮肤细胞中来确定到底哪种蛋白质对于修复破碎的DNA链非常关键,结果研究者发现了一种关键蛋白c-Jun氨基末端激酶(JNK),该蛋白能够激活基因对氧化性应激的反应,当JNK被抑制时,SIRT6就不会被激活,而且破碎

图片来源:www.phys.org

近日,一项刊登在国际杂志Cell Reports上的研究报告中,来自美国罗彻斯特大学的研究人员在寻找激活SIRT6的机制时,他们将化学抑制剂应用于人类皮肤细胞中来确定到底哪种蛋白质对于修复破碎的DNA链非常关键,结果研究者发现了一种关键蛋白c-Jun氨基末端激酶(JNK),该蛋白能够激活基因对氧化性应激的反应,当JNK被抑制时,SIRT6就不会被激活,而且破碎的DNA链也不会被有效地修复。

为了在细胞内部传递压力信号,JNKs会将磷酸基团添加到蛋白质上,研究者发现,JNK能够修饰SIRT6上的氨基酸残基,一旦被修饰,SIRT6就能够将PARP1酶吸引到DNA的损伤位点中,在损伤位点处PARP1就能会进行一系列化学过程来修复DNA;实际上,激活的基因能够充当第一响应者来将DNA修复酶类招募到事故位点并且促进其发挥DNA修复的过程。

研究者Gorbunova表示,这项研究中我们揭示了机体老化过程发生的分子机制,此前研究中我们通过研究阐明了机体在以后生活中出现的“次级”DNA修复过程,同时还揭示了跳跃基因如何保持无活性状态。理解机体老化的分子、化学及遗传过程对于个体保持长寿以及较好的生活质量非常关键,当然后期还需要进行更多的研究以及临床实践,而且这对于开发新型抗衰老疗法也至关重要。

最后研究者表示,本文的研究结果还能够帮助制药研究者未来设计新型药物来激活SIRT6从而降低机体DNA的损伤过程;这些药物或许能够被用来保护机体基因组免受损伤,当然也能够抑制癌症及其它疾病的发生,并且延长个体的健康寿命。

原始出处

Michael Van Meter, Matthew Simon, Gregory Tombline, Alfred May, Timothy D. Morello, Basil P. Hubbard, Katie Bredbenner, Rosa Park, David A. Sinclair, Vilhelm A. Bohr, Vera Gorbunova4, Andrei Seluanov.JNK Phosphorylates SIRT6 to Stimulate DNA Double-Strand Break Repair in Response to Oxidative Stress by Recruiting PARP1 to DNA Breaks.Cell Rep.2016

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    2017-06-25 我爱光明2009

    很有研究前景

    0

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    2016-09-13 维他命
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    2017-03-15 仁医06
  4. 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createdTime=Wed Sep 14 14:14:00 CST 2016, time=2016-09-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=126649, encodeId=a1901266498c, content=学习了,赞一个!, beContent=null, objectType=article, channel=null, level=null, likeNumber=146, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160905/IMG57CD39B82D12E7926.jpg, createdBy=ac2c1946830, createdName=青龙偃月, createdTime=Wed Sep 14 14:13:00 CST 2016, time=2016-09-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=126216, encodeId=b59f1262160f, content=学习了,赞一个!!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=102, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRuUXgacXpPeW0x8Z3Qr9c3I2kTic4ZIpR29iaftYgkjRcbv982icYMtqANBPYBgPnOia6mVtX76qMXuc/0, 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createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzSEB4Gw5zzMTFicSXpRPB29ZqXZWCwpKGlNQClGxQkM0V13y0nwwfOibuwhkgK3VibicMKbKcMSUzTzp/0, createdBy=e5131935950, createdName=1e0dde21m68(暂无匿称), createdTime=Tue Sep 13 20:19:00 CST 2016, time=2016-09-13, status=1, ipAttribution=)]
    2016-09-15 jambiya
  5. 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createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzSEB4Gw5zzMTFicSXpRPB29ZqXZWCwpKGlNQClGxQkM0V13y0nwwfOibuwhkgK3VibicMKbKcMSUzTzp/0, createdBy=e5131935950, createdName=1e0dde21m68(暂无匿称), createdTime=Tue Sep 13 20:19:00 CST 2016, time=2016-09-13, status=1, ipAttribution=)]
    2016-09-14 青龙偃月

    学习了,赞一个!

    0

  6. 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createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzSEB4Gw5zzMTFicSXpRPB29ZqXZWCwpKGlNQClGxQkM0V13y0nwwfOibuwhkgK3VibicMKbKcMSUzTzp/0, createdBy=e5131935950, createdName=1e0dde21m68(暂无匿称), createdTime=Tue Sep 13 20:19:00 CST 2016, time=2016-09-13, status=1, ipAttribution=)]
    2016-09-14 青龙偃月

    学习了,赞一个!

    0

  7. 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createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzSEB4Gw5zzMTFicSXpRPB29ZqXZWCwpKGlNQClGxQkM0V13y0nwwfOibuwhkgK3VibicMKbKcMSUzTzp/0, createdBy=e5131935950, createdName=1e0dde21m68(暂无匿称), createdTime=Tue Sep 13 20:19:00 CST 2016, time=2016-09-13, status=1, ipAttribution=)]
    2016-09-14 青龙偃月

    学习了,赞一个!

    0

  8. 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createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzSEB4Gw5zzMTFicSXpRPB29ZqXZWCwpKGlNQClGxQkM0V13y0nwwfOibuwhkgK3VibicMKbKcMSUzTzp/0, createdBy=e5131935950, createdName=1e0dde21m68(暂无匿称), createdTime=Tue Sep 13 20:19:00 CST 2016, time=2016-09-13, status=1, ipAttribution=)]
    2016-09-14 1dd8a7c5m95(暂无匿称)

    学习了,赞一个!!!

    0

  9. 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createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzSEB4Gw5zzMTFicSXpRPB29ZqXZWCwpKGlNQClGxQkM0V13y0nwwfOibuwhkgK3VibicMKbKcMSUzTzp/0, createdBy=e5131935950, createdName=1e0dde21m68(暂无匿称), createdTime=Tue Sep 13 20:19:00 CST 2016, time=2016-09-13, status=1, ipAttribution=)]
    2016-09-14 1dd8a7c5m95(暂无匿称)

    学习了,赞一个!!!

    0

  10. 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createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzSEB4Gw5zzMTFicSXpRPB29ZqXZWCwpKGlNQClGxQkM0V13y0nwwfOibuwhkgK3VibicMKbKcMSUzTzp/0, createdBy=e5131935950, createdName=1e0dde21m68(暂无匿称), createdTime=Tue Sep 13 20:19:00 CST 2016, time=2016-09-13, status=1, ipAttribution=)]
    2016-09-13 1e0dde21m68(暂无匿称)

    这种修复是异源重组修复么?如果是的话,会增加细胞突变频率,诱发癌症的!

    0

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 一直以来,来自哥本哈根大学的Anja Groth教授以及她的研究团队对人体内多种特定细胞类型的发育和维持进行了大量研究,最近他们又取得了新的突破性进展,并将研究结果发表在国际学术期刊Nature上。Anja Groth教授对他们的工作进行了这样的总结:“在这项研究中,我们证明了细胞如何通过组蛋白修饰指引一种细胞内DNA修复蛋白到达DNA损伤位置。癌细胞快速分裂的过程中会产生许多DNA损

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最近,华人科学家张锋与美国科学家Dr. Jennifer Doudna就CRISPR技术专利之争因为一封邮件而再起波澜。令人庆幸的是,法律层面的争夺似乎并未令CRISPR技术明显受限。最近,CRISPR技术领域的先驱Caribou公司就再次发布了他们在CRISPR-Cas9研究领域的最新进展。公司的研究团队发现了CRISPR-Cas9基因编辑技术在不同细胞系中的响应模式。公司在最新进展中表示,

Nat Commun:特殊压力应答器助力DNA修复

DNA损伤会增加癌症的风险,近日一项刊登在Nature Communications上的研究论文中,来自乔治亚医科大学的科学家通过研究发现,一种当细胞受压力时聚集产生的特殊蛋白活在DNA修复的早期阶段扮演重要角色。在进行DNA损伤修复过程中,一种名为ATF3的活性转录因子3似乎是第一个应答者,其会增加自身的水平,随后寻找并且同另外一种名为Tip60的蛋白结合,最终帮助吸引一大群损伤位点的蛋白质。

Sci Rep:癌细胞的克星—狼疮抗体

近日,来自耶鲁大学癌症研究中心的科学家通过研究发现狼疮抗体或许会摧毁癌细胞,相关研究成果刊登于国际杂志Scientific Reports上。 文章中研究人员James E. Hansen表示,缺失DNA修复机制的癌细胞往往会对狼疮抗体的攻击更为敏感;狼疮患者会产生许多自身抗体来攻击患者自身的细胞,从而产生狼疮的典型症状;实际上这些抗体中的一部分往往会渗入到细胞核中损伤DNA,研究人员假设,或许

三篇Nature文章深入解析DNA修复的关键过程

图片摘自:en.wikipedia.org我们细胞中的DNA会被多种外部因子持续损伤,比如包含烟草烟雾的致癌物或来源于太阳光的紫外线辐射等;如果未被修复,这些损伤就会引发突变,最终就会导致细胞癌变;那么细胞为何不快速有效地进行DNA损伤的修复呢?为了完成该目的,细胞会利用一系列酶类,而且这些酶类必须同时采取行动才能够鉴别并且修复基因组的损伤,然而长期以来科学家们往往难以理解上述过程的复杂性及其相关

Science:重大突破!鉴定出保持细菌基因组完整性的关键分子ppGpp

在一项新的研究中,来自美国纽约大学朗格尼医学中心和俄罗斯科学院的研究人员发现一种关键的生物化学分子ppGpp能够让细菌修复它们DNA上的致命性损伤,包括抗生素导致的DNA损伤。

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