J immunol:HIF-1α在抗结核杆菌感染中的作用

2016-07-25 佚名 生物谷

肺结核是一类全球感染人数最多(20亿人),并且每年造成死亡人数最多的疾病,结核杆菌是肺结核的感染源,而机体中巨噬细胞分泌的IFN-gamma对于宿主抵抗结核杆菌的感染具有重要的作用。小鼠试验以及临床检测结果均表明,缺乏IFN-gamma后机体更加容易受到结核杆菌侵染。IFN-gamma信号的抗感染机制包括抑制病原体的营养摄入,促进细胞自噬反应,表达内源性的抑毒因子(IFN诱导的GTPase等),以

肺结核是一类全球感染人数最多(20亿人),并且每年造成死亡人数最多的疾病,结核杆菌是肺结核的感染源,而机体中巨噬细胞分泌的IFN-gamma对于宿主抵抗结核杆菌的感染具有重要的作用。小鼠试验以及临床检测结果均表明,缺乏IFN-gamma后机体更加容易受到结核杆菌侵染。IFN-gamma信号的抗感染机制包括抑制病原体的营养摄入,促进细胞自噬反应,表达内源性的抑毒因子(IFN诱导的GTPase等),以及产生NO。其中,NO具有明显的抑制结核杆菌感染的效果。

HIF-1a是一类转录因子,在低氧环境下能够诱导糖酵解相关基因的表达。最近研究表明,在LPS的刺激下HIF-1a能够诱导巨噬细胞向M1方向分化。在脓毒症发病过程中,HIF-1a能够介导宿主的免疫耐受效应,同时保持对病原体的杀伤活性。另外,HIF-1a还被证明能够有效控制金黄色葡萄球菌,绿脓杆菌以及尿路感染的大肠杆菌的感染。缺乏HIF-1a的小鼠体内巨噬细胞缺乏ATP供应,因而难以迁移至炎症区域,同时,体内iNOS以及抗菌肽的表达也受到了明显的影响。最近一些研究发现,HIF-1a可能参与了宿主的抗结核杆菌感染免疫反应。人为提高小鼠体内HIF-1a的水平有助于增强抗菌反应的效果。

为了进一步研究这一问题,来自美国加州伯克利分校的Sarah A. Stanley课题组进行了深入研究,相关结果发表在最近一期的《Journal of Immunology》杂志上。

首先,作者检测了小鼠感染结核杆菌之后体内巨噬细胞的状态。结果显示,在感染之后巨噬细胞内HIF-1a的表达量有较低水平的上升。但在经过LPS刺激之后,HIF-1a的水平开始明显升高,进一步,作者发现IFN-g的刺激与结合杆菌的侵染协同刺激了HIF-1a的大量产生。之后,作者发现HIF-1a能够有效促进受到IFN-g激活的巨噬细胞杀伤细菌的能力。

由于HIF-1a能够调节多种基因的表达,为了寻找HIF-1a可能调节的抑制结合杆菌侵染的基因,作者进行了RNA-seq检测。结果显示,受到感染的巨噬细胞中有3330个基因的表达量有了上调,而IFN-g的刺激再次提高了其中2595个基因的表达量。其中,HIF-1a在未受刺激的巨噬细胞中仅调节118个基因,而在受到IFN刺激的巨噬细胞中,HIF-1a则能够调节1191个基因的表达。在这些基因中,作者发现IL-1aIL-1bIL-6以及区划因子CXCL1等的表达量都受到HIF-1a的调节。

之后,作者发现HIF-1a能够调节巨噬细胞中PG以及NO的产生,进而对入侵的结合杆菌起到杀伤的作用。另外,在受到感染的巨噬细胞中,整个低氧的糖酵解代谢途径的活跃程度有明显的升高,这与HIF-1a也有重要的联系。

最后,作者通过体内试验比较野生型小鼠与HIF-1a突变体小鼠在结合杆菌感染过程中的症状差异,证明了HIF-1a对于宿主抵抗结核杆菌的感染具有重要的意义。

原始出处

Jonathan Braverma, Kimberly M. Sogi, Daniel Benjamin, Daniel K. Nomur‡ and Sarah A. Stanley.HIF-1α Is an Essential Mediator of IFN-γ–Dependent Immunity to Mycobacterium tuberculosis.J immunol.2016

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    2016-07-27 wgx309
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    2016-07-27 changfy
  5. [GetPortalCommentsPageByObjectIdResponse(id=1253991, encodeId=7867125399129, content=<a href='/topic/show?id=f30ae86297d' target=_blank style='color:#2F92EE;'>#结核#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78629, encryptionId=f30ae86297d, topicName=结核)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4dfa37, createdName=huhuaidong387, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1509882, encodeId=77db1509882f0, content=<a href='/topic/show?id=d9d855612c2' target=_blank style='color:#2F92EE;'>#抗结核#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=55612, encryptionId=d9d855612c2, topicName=抗结核)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c49410165177, createdName=wgx309, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1510527, encodeId=becd151052ecb, content=<a href='/topic/show?id=ccbce864958' target=_blank style='color:#2F92EE;'>#结核杆菌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=45, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78649, encryptionId=ccbce864958, topicName=结核杆菌)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=27ac10195745, createdName=yangfl09, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1522144, encodeId=fad715221440d, content=<a href='/topic/show?id=1b34881e59' target=_blank style='color:#2F92EE;'>#HIF-1α#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=8817, encryptionId=1b34881e59, topicName=HIF-1α)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=847f11414102, createdName=changfy, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1556020, encodeId=5046155602052, content=<a href='/topic/show?id=b3e98813c3' target=_blank style='color:#2F92EE;'>#HIF#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=8813, encryptionId=b3e98813c3, topicName=HIF)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=293014689254, createdName=wrj0126, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=94721, encodeId=056c94e21c8, content=受益匪浅, beContent=null, objectType=article, channel=null, level=null, likeNumber=99, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=90ea1614944, createdName=huangwukui, createdTime=Tue Jul 26 08:47:00 CST 2016, time=2016-07-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=94661, encodeId=450094661dd, content=学习学习!, beContent=null, objectType=article, channel=null, level=null, likeNumber=100, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=93f31631454, createdName=1dd8c52fm63(暂无匿称), createdTime=Mon Jul 25 21:44:00 CST 2016, time=2016-07-25, status=1, ipAttribution=)]
    2016-07-27 wrj0126
  6. [GetPortalCommentsPageByObjectIdResponse(id=1253991, encodeId=7867125399129, content=<a href='/topic/show?id=f30ae86297d' target=_blank style='color:#2F92EE;'>#结核#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78629, encryptionId=f30ae86297d, topicName=结核)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4dfa37, createdName=huhuaidong387, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1509882, encodeId=77db1509882f0, content=<a href='/topic/show?id=d9d855612c2' target=_blank style='color:#2F92EE;'>#抗结核#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=55612, encryptionId=d9d855612c2, topicName=抗结核)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c49410165177, createdName=wgx309, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1510527, encodeId=becd151052ecb, content=<a href='/topic/show?id=ccbce864958' target=_blank style='color:#2F92EE;'>#结核杆菌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=45, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78649, encryptionId=ccbce864958, topicName=结核杆菌)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=27ac10195745, createdName=yangfl09, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1522144, encodeId=fad715221440d, content=<a href='/topic/show?id=1b34881e59' target=_blank style='color:#2F92EE;'>#HIF-1α#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=8817, encryptionId=1b34881e59, topicName=HIF-1α)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=847f11414102, createdName=changfy, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1556020, encodeId=5046155602052, content=<a href='/topic/show?id=b3e98813c3' target=_blank style='color:#2F92EE;'>#HIF#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=8813, encryptionId=b3e98813c3, topicName=HIF)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=293014689254, createdName=wrj0126, createdTime=Wed Jul 27 06:08:00 CST 2016, time=2016-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=94721, encodeId=056c94e21c8, content=受益匪浅, beContent=null, objectType=article, channel=null, level=null, likeNumber=99, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=90ea1614944, createdName=huangwukui, createdTime=Tue Jul 26 08:47:00 CST 2016, time=2016-07-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=94661, encodeId=450094661dd, content=学习学习!, beContent=null, objectType=article, channel=null, level=null, likeNumber=100, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=93f31631454, createdName=1dd8c52fm63(暂无匿称), createdTime=Mon Jul 25 21:44:00 CST 2016, time=2016-07-25, status=1, ipAttribution=)]
    2016-07-26 huangwukui

    受益匪浅

    0

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    2016-07-25 1dd8c52fm63(暂无匿称)

    学习学习!

    0

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