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Nat Commun:科学家发现抗衰老关键,维生素B3能延缓衰老

2016-03-23 生物谷 生物谷

逐渐积累的细胞损伤对老化的起因起到非常重要的作用。但是,细胞损伤有很多种来源,到底哪些真正对衰老至关重要,哪些无关紧要,仍是个没有答案的问题。衰老的氧化假说——也称自由基假说,是由1956年Denham Harman提出的。从那时起, 很多试图证明衰老与氧化损伤关系的努力都失败了,包括抗氧化物相关的多个临床试验。因此,虽然在衰老过程中氧化损伤的积累显而易见,大多数科学家仍然认为其与衰老的成因几乎不

逐渐积累的细胞损伤对老化的起因起到非常重要的作用。但是,细胞损伤有很多种来源,到底哪些真正对衰老至关重要,哪些无关紧要,仍是个没有答案的问题。

衰老的氧化假说——也称自由基假说,是由1956年Denham Harman提出的。从那时起, 很多试图证明衰老与氧化损伤关系的努力都失败了,包括抗氧化物相关的多个临床试验。因此,虽然在衰老过程中氧化损伤的积累显而易见,大多数科学家仍然认为其与衰老的成因几乎不相干。

然而,最近发表的结果可能将改变这一切。西班牙国家癌症研究中心(CNIO)的科学家们与Valencia大学的科学家、马德里IMDEA合作,提高整体的细胞抗氧能力,而不是仅仅集中抗氧化酶。为了达到抗氧化能力的整体提高,研究人员聚焦于提高NADPH的水平。NADPH是抗氧化反应中起关键作用的一个相对简单的分子。到目前为止其他人并没有将NADPH的研究与衰老联系起来。

研究人员利用基因手段提高的NADPH含量,他们使用了转基因小鼠,此小鼠在整个体内高水平表达产生NADPH最重要的酶—葡萄糖-6-磷酸脱氢酶。研究结果在Nature Communications上发表,结果表明增加G6PD酶,从而增加NADPH增强了机体的自然抗氧化能力,防止氧化损伤,减少了衰老相关过程,例如胰岛素抵抗,并延长了寿命。

延缓衰老的抗氧化剂

正如预期的,这些转基因动物对剧毒的人工氧化处理更具有抵抗力,因此证明了G6PD的增长能够提高抗氧化能力。此外,当研究人员分析发现长寿的转基因动物与相同年龄的非转基因动物相比氧化损伤更小。他们还研究了癌症的倾向发现两者并没有差异,说明G6PD的增强对癌症的形成没有太大影响。

对团队来说,最大的惊喜就是他们测量转基因小鼠衰老进程时:随着小鼠衰老,高表达G6PD所带来的高水平NADPH,延缓了衰老,能更好地代谢糖,表现出更好的运动协调性。另外,转基因雌鼠比非转基因小鼠寿命延长14%,然而在雄鼠中却并没有此现象。

寿命的延长虽然不多,但考虑到之前对抗氧化酶的操纵失败了,这个结果还是很振奋人心的。

全面提高细胞抗氧化能力

也许,关键就在于该文章的研究人员以一个全面的方式增强所有抗氧化酶。与传统的处理直接与氧反应的氧化剂的方法相比,我们通过提高G6PD水平与的副产物NADPH,提高了细胞所有的天然抗氧化机制。

基于这些研究结果,研究人员倾向于使用能提高NADPH水平的药剂或营养品作为潜在工具,延缓衰老,延缓衰老相关疾病如糖尿病。具体来说,维他命B3与其衍生物对NADPH前提合成其重要作用,适合作为今后研究的候选药物。

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    2017-01-13 liye789132251
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    2016-08-02 liuli5079
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    2016-03-25 马龙
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    2016-03-23 dhzzm

    有类似报到,有待临床循征进一步支持

    0

  8. [GetPortalCommentsPageByObjectIdResponse(id=1880974, encodeId=b4de18809e402, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=85, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Fri Jan 13 02:12:00 CST 2017, time=2017-01-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1932368, encodeId=22ca193236857, content=<a href='/topic/show?id=d8de4951168' target=_blank style='color:#2F92EE;'>#延缓衰老#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=71, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=49511, encryptionId=d8de4951168, topicName=延缓衰老)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7f52347, createdName=soongzhihua, createdTime=Thu Sep 29 13:12:00 CST 2016, time=2016-09-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2086853, encodeId=b0e9208685374, content=<a href='/topic/show?id=490750196b' target=_blank style='color:#2F92EE;'>#COMMUN#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=86, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5019, encryptionId=490750196b, topicName=COMMUN)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7931272, createdName=liuli5079, createdTime=Tue Aug 02 10:12:00 CST 2016, time=2016-08-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1802311, encodeId=cbb618023116f, 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=63, 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 Jul 01 18:12:00 CST 2016, time=2016-07-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1701401, encodeId=d9061e01401e1, content=<a href='/topic/show?id=220ee90625a' target=_blank style='color:#2F92EE;'>#维生素B3#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=143, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=79062, encryptionId=220ee90625a, topicName=维生素B3)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=d94630353217, createdName=wleon8905, createdTime=Wed Sep 07 20:12:00 CST 2016, time=2016-09-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1508504, encodeId=06ed15085045a, content=<a href='/topic/show?id=68b0e9055f7' target=_blank style='color:#2F92EE;'>#维生素B#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=77, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=79055, encryptionId=68b0e9055f7, topicName=维生素B)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=17599981768, createdName=马龙, createdTime=Fri Mar 25 01:12:00 CST 2016, time=2016-03-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=72993, encodeId=73d1e299377, content=有类似报到,有待临床循征进一步支持, beContent=null, objectType=article, channel=null, level=null, likeNumber=142, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=387d1660055, createdName=dhzzm, createdTime=Wed Mar 23 16:59:00 CST 2016, time=2016-03-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=72873, encodeId=9007e28731f, content=厉害厉害, beContent=null, objectType=article, channel=null, level=null, likeNumber=147, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7cde98330, createdName=milkshark, createdTime=Wed Mar 23 12:17:00 CST 2016, time=2016-03-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=72874, encodeId=8ef0e28748c, content=厉害厉害, beContent=null, objectType=article, channel=null, level=null, likeNumber=169, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7cde98330, createdName=milkshark, createdTime=Wed Mar 23 12:17:00 CST 2016, time=2016-03-23, status=1, ipAttribution=)]
    2016-03-23 milkshark

    厉害厉害

    0

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    2016-03-23 milkshark

    厉害厉害

    0

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