Cell Host Microbe:衰老导致肠道菌群失衡促进慢性炎症

2017-04-13 MedSci MedSci原创

这项研究发现了随着机体的衰老以及肠道功能问题会造成肠道微生物的紊乱,导致部分部分肠道微生物进入血循环系统,从而激发更强的炎症反应。这一炎症反应慢慢积累并且反过头来继续破坏肠道功能,导致恶性循环。

伴随着机体能力的衰老,体内炎症的程度反而慢慢积累。然而这一上升的炎症程度并没有提高机体的免疫力,反而使免疫力慢慢失活。并且积累的炎症也会损害各个器官组织的功能。在最新一期的Cell Host&Microbe 杂志中,来自加拿大McMaster大学的Netusha Thevaranjan及其同事报道了他们的发现:肠道微生物菌群在调控与衰老相关的炎症有重要的作用。

研究组首先发现来自于年老的实验鼠的巨噬细胞(macrophage)相比于来自年轻老鼠的巨噬细胞,在杀死细菌的能力上有缺陷。并且从年老老鼠的血液上清及肺液中检测到更多的TNF和IL6。TNF和IL6是经典的体现机体炎症程度的细胞激素。在体外刺激年老老鼠的巨噬细胞也产生更多的TNF和IL6。这些现象可能是因为年老老鼠的机体长期暴露于细胞激素TNF的刺激下。因为,在TNF受体缺陷的老鼠上,年老和年轻的老鼠之间的区别就不明显。

那么是什么因素导致了随着衰老带来的细胞激素TNF的积累呢?研究组发现,随着年龄的增长,肠道组织的功能慢慢受到破坏,表现为慢性炎症,以及肠通透性的增加。其直接的结果就是导致在肠道中的微生物慢慢的渗透入血循环。相对应的,在无菌环境下长大的老鼠比在有菌环境下长大的老鼠的寿命更长,系统性的炎症程度(IL6)大大小于有菌环境下长大的老鼠。

研究组接着发现,如果将来自年老老鼠的肠道微生物和来自年轻老鼠的肠道微生物接种到同年龄的无菌老鼠后,年老老鼠的肠道微生物会造成更多的系统性炎症以及更多的肠道功能失调。

这项研究发现了随着机体的衰老以及肠道功能问题会造成肠道微生物的紊乱,导致部分部分肠道微生物进入血循环系统,从而激发更强的炎症反应。这一炎症反应慢慢积累并且反过头来继续破坏肠道功能,导致恶性循环。

原始初始:
Netusha Thevaranjan, Alicja Puchta, Christian Schulz et al., Age-Associated Microbial Dysbiosis Promotes Intestinal Permeability, Systemic Inflammation, and Macrophage Dysfunction. Cell Host & Microbe 21, 455–466 April 12, 2017. http://dx.doi.org/10.1016/j.chom.2017.03.002

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    2017-08-26 zhaojie88
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    2017-08-21 xjy02
  5. [GetPortalCommentsPageByObjectIdResponse(id=1869876, encodeId=3e4918698e663, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Sun Dec 24 06:03:00 CST 2017, time=2017-12-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960135, encodeId=d69f1960135dc, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=32, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=zhaojie88, createdTime=Sat Aug 26 00:03:00 CST 2017, time=2017-08-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1857425, encodeId=055a185e42530, content=<a href='/topic/show?id=3f48525849' target=_blank style='color:#2F92EE;'>#CRO#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5258, encryptionId=3f48525849, topicName=CRO)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c30265, createdName=jiafufeng@yaho, createdTime=Sun Mar 11 05:03:00 CST 2018, time=2018-03-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2084193, encodeId=988c20841933d, content=<a href='/topic/show?id=61f411e013b' target=_blank style='color:#2F92EE;'>#Micro#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11701, encryptionId=61f411e013b, topicName=Micro)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=d59291, createdName=xjy02, createdTime=Mon Aug 21 01:03:00 CST 2017, time=2017-08-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=193409, encodeId=a89819340980, content=纯净的能量循环非常重要, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/04/24/1c2dbd6706e64df33befd6663f1d6b37.jpg, createdBy=94f61661779, createdName=lyh994, createdTime=Wed May 03 22:09:27 CST 2017, time=2017-05-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1392239, encodeId=a89d13922395f, content=<a href='/topic/show?id=223081e33b6' target=_blank style='color:#2F92EE;'>#肠道菌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81733, encryptionId=223081e33b6, topicName=肠道菌)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=aa292500107, createdName=1249897bm37(暂无昵称), createdTime=Sat Apr 15 09:03:00 CST 2017, time=2017-04-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=187377, encodeId=1e4918e377d8, content=mark, beContent=null, objectType=article, channel=null, level=null, likeNumber=43, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/05/02/48d1fec880a796cc2ad284d7b18e6017.jpg, createdBy=43e51704272, createdName=九天., createdTime=Fri Apr 14 14:14:37 CST 2017, time=2017-04-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=187367, encodeId=92da18e367b6, content=mark, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/05/02/48d1fec880a796cc2ad284d7b18e6017.jpg, createdBy=43e51704272, createdName=九天., createdTime=Fri Apr 14 14:10:34 CST 2017, time=2017-04-14, status=1, ipAttribution=)]
    2017-05-03 lyh994

    纯净的能量循环非常重要

    0

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  7. [GetPortalCommentsPageByObjectIdResponse(id=1869876, encodeId=3e4918698e663, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Sun Dec 24 06:03:00 CST 2017, time=2017-12-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960135, encodeId=d69f1960135dc, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=32, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=zhaojie88, createdTime=Sat Aug 26 00:03:00 CST 2017, time=2017-08-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1857425, encodeId=055a185e42530, content=<a href='/topic/show?id=3f48525849' target=_blank style='color:#2F92EE;'>#CRO#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5258, encryptionId=3f48525849, topicName=CRO)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c30265, createdName=jiafufeng@yaho, createdTime=Sun Mar 11 05:03:00 CST 2018, time=2018-03-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2084193, encodeId=988c20841933d, content=<a href='/topic/show?id=61f411e013b' target=_blank style='color:#2F92EE;'>#Micro#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11701, encryptionId=61f411e013b, topicName=Micro)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=d59291, createdName=xjy02, createdTime=Mon Aug 21 01:03:00 CST 2017, time=2017-08-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=193409, encodeId=a89819340980, content=纯净的能量循环非常重要, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/04/24/1c2dbd6706e64df33befd6663f1d6b37.jpg, createdBy=94f61661779, createdName=lyh994, createdTime=Wed May 03 22:09:27 CST 2017, time=2017-05-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1392239, encodeId=a89d13922395f, content=<a href='/topic/show?id=223081e33b6' target=_blank style='color:#2F92EE;'>#肠道菌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81733, encryptionId=223081e33b6, topicName=肠道菌)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=aa292500107, createdName=1249897bm37(暂无昵称), createdTime=Sat Apr 15 09:03:00 CST 2017, time=2017-04-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=187377, encodeId=1e4918e377d8, content=mark, beContent=null, objectType=article, channel=null, level=null, likeNumber=43, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/05/02/48d1fec880a796cc2ad284d7b18e6017.jpg, createdBy=43e51704272, createdName=九天., createdTime=Fri Apr 14 14:14:37 CST 2017, time=2017-04-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=187367, encodeId=92da18e367b6, content=mark, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/05/02/48d1fec880a796cc2ad284d7b18e6017.jpg, createdBy=43e51704272, createdName=九天., createdTime=Fri Apr 14 14:10:34 CST 2017, time=2017-04-14, status=1, ipAttribution=)]
    2017-04-14 九天.

    mark

    0

  8. [GetPortalCommentsPageByObjectIdResponse(id=1869876, encodeId=3e4918698e663, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Sun Dec 24 06:03:00 CST 2017, time=2017-12-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960135, encodeId=d69f1960135dc, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=32, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=zhaojie88, createdTime=Sat Aug 26 00:03:00 CST 2017, time=2017-08-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1857425, encodeId=055a185e42530, content=<a href='/topic/show?id=3f48525849' target=_blank style='color:#2F92EE;'>#CRO#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5258, encryptionId=3f48525849, topicName=CRO)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c30265, createdName=jiafufeng@yaho, createdTime=Sun Mar 11 05:03:00 CST 2018, time=2018-03-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2084193, encodeId=988c20841933d, content=<a href='/topic/show?id=61f411e013b' target=_blank style='color:#2F92EE;'>#Micro#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11701, encryptionId=61f411e013b, topicName=Micro)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=d59291, createdName=xjy02, createdTime=Mon Aug 21 01:03:00 CST 2017, time=2017-08-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=193409, encodeId=a89819340980, content=纯净的能量循环非常重要, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/04/24/1c2dbd6706e64df33befd6663f1d6b37.jpg, createdBy=94f61661779, createdName=lyh994, createdTime=Wed May 03 22:09:27 CST 2017, time=2017-05-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1392239, encodeId=a89d13922395f, content=<a href='/topic/show?id=223081e33b6' target=_blank style='color:#2F92EE;'>#肠道菌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81733, encryptionId=223081e33b6, topicName=肠道菌)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=aa292500107, createdName=1249897bm37(暂无昵称), createdTime=Sat Apr 15 09:03:00 CST 2017, time=2017-04-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=187377, encodeId=1e4918e377d8, content=mark, beContent=null, objectType=article, channel=null, level=null, likeNumber=43, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/05/02/48d1fec880a796cc2ad284d7b18e6017.jpg, createdBy=43e51704272, createdName=九天., createdTime=Fri Apr 14 14:14:37 CST 2017, time=2017-04-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=187367, encodeId=92da18e367b6, content=mark, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/05/02/48d1fec880a796cc2ad284d7b18e6017.jpg, createdBy=43e51704272, createdName=九天., createdTime=Fri Apr 14 14:10:34 CST 2017, time=2017-04-14, status=1, ipAttribution=)]
    2017-04-14 九天.

    mark

    0

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Science:为什么随年龄增长免疫系统也会衰老?

3月31日发表在Science上的这篇文章揭示了,与年轻人相比老年人的免疫细胞缺乏协调性,基因表达具有多变且不稳定的特定。 我们能够看到因衰老导致的身体功能下降,但究竟是什么原因导致了这些机能衰退?为什么身体不同部位的衰老程度不同? 为了找到答案,科学家们需要从分子水平上分别了解每一个组织的老化机制。今天我们就来讲讲免疫组织,特别是CD4+T细胞的衰老机制。 人体的免疫系统像一个交响乐团,由

Science:重大突破!利单细胞测序揭示免疫细胞衰老之谜

在一项新的研究中,来自欧洲生物信息研究所(EMBL-EBI)、英国剑桥大学、韦尔科姆基金会桑格研究所和英国癌症研究所(CRUK-CI)的研究人员针对免疫系统为何随着年龄的增加而减弱存在的长期争论提出新的认识。他们的发现表明相比

Nature子刊:重磅级研究或将开启人类长生不老的神话!

老化,即随着机体衰老,细胞的分裂和生长能力不断退化的一种表现,其会诱发机体功能退化以及年龄相关的疾病,抗衰老一直是人类所梦寐以求的,然而对于生物学家而言,寻找能够有效控制机体衰老的物质以及阐明机体衰老的分子机制或许并非一件易事。 近日,刊登在国际杂志Nature Chemical Biology上的一项

突破性研究共同解读炎症与多种疾病发生的关联

近年来,随着科学家们研究的深入,他们慢慢发现人类机体多种疾病的发生都与机体炎症之间存在着密切的关联,于是很多研究者就重点对炎症和某一疾病的发生进行了大量研究,当然他们也取得了很多研究成果,比如来自匹兹堡大学的研究人员就通过研究深入解读了癌症、老化及机体炎症发生三者之间的分子机制和关联。 本文中,小编整理了多篇突破性研究,来阐明炎症和多种疾病发生之间的关系,分享给各位! 【1】JLB:

New Scientist:年轻血液中起逆衰老作用的物质到底是什么

根据《New Scientist》的报道,研究人员在一项新的研究中发现,一种称为骨桥蛋白的蛋白质在年老老鼠体内含量较低,并且干细胞注入老鼠体内后会迅速老化。相反,如果将老化的干细胞与骨桥蛋白混合,则干细胞逐渐恢复活力。研究团队表示,他们将继续开展该方面的研究工作,致力于开发一种药物,希望该药物能够使老年人再次“年轻”并提升老年人的免疫系统。

Science:衰老造成CD4+T细胞免疫力下降和基因表达不稳定

年轻的CD4+T细胞在受到刺激后,就算来自不同种族的CD4+T细胞,也统一的表达调节免疫的关键基因群。相反,年老的CD4+T细胞在受到刺激后,节免疫的关键基因群的表达程度下降,但是细胞和细胞间的基因表达的一致性下降,造成了更多的个体差异。这项研究,为衰老引起的免疫力低下,以及基因表达的不稳定和突变几率的上升提供了理论支持。