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J immunol: 树突状细胞分泌IL-27的新调节机制

2017-01-11 佚名 生物谷

(图片摘自www.sciencealert.com)IL-27是一类IL-12家族的细胞因子,它的两个亚基EBI3与p28能够形成异源二聚体,并通过IL-27R激活下游信号。髓系来源的树突状细胞在受到特定刺激后能够导致TLR、CD40以及IFN 等受体的激活,并最终引发IL-27的分泌。此前也有研究表明DC是IL-27的主要分泌来源。之前的研究已经证明IL-27在感染性疾病与自体免疫疾病中


(图片摘自www.sciencealert.com)

IL-27是一类IL-12家族的细胞因子,它的两个亚基EBI3与p28能够形成异源二聚体,并通过IL-27R激活下游信号。髓系来源的树突状细胞在受到特定刺激后能够导致TLR、CD40以及IFN 等受体的激活,并最终引发IL-27的分泌。此前也有研究表明DC是IL-27的主要分泌来源。

之前的研究已经证明IL-27在感染性疾病与自体免疫疾病中的作用,IL-27R缺失突变的小鼠水平的试验也表明其能够负向调节T细胞的活性。其中,IL-27被认为能够限制Th1与Th17的分化与功能。尽管IL-27的产生机制已经被研究的十分完善,但负向调控的机制目前并没有得到完全的阐释。

PGE2是一类花生四烯酸的前列腺素,包括DC在内的多种免疫细胞都是其分泌的来源。PGE2通过EP受体能够激活下游信号,从而引起炎症反应。为了研究PGE2在调节DC分泌IL-27过程中的作用,来自美国temple大学的Doina Ganea课题组进行了深入的研究,相关结果发表在最近一期的《Journal of Immunology》杂志上。

首先,作者通过体外实验对小鼠来源的DC进行LPS刺激,并在此基础上进行了PGE2的刺激。结果显示,PGE2能够显著抑制LPS引起的IL-27的分泌,而且存在明显的剂量依赖性。

之后,作者发现PGE2能够结合其特定的受体EP2/EP4,并进一步激活DC胞浆中的cAMP。cAMP的激活能够有效抑制DC表达IL-27。因此,作者认为PGE2能够通过刺激DC表面的受体EP2/EP4以及下游的一系列胞内信号,最终影响IL-27的表达水平。

接下来,作者发现细胞转录因子IRF1参与了PGE2抑制IL-27分泌的这一过程,但STAT1或STAT2则没有参与这一过程。

最后,作者还通过体外实验证明了IFN-beta也一定程度上参与了这一信号的调节过程。

综上,作者通过一系列体外实验阐释了PGE2负向调节IL-27分泌的分子机制。

原始出处

Kirsten M. Hooper, Jui-Hung Yen, Weimin Kong, Kate M. Rahbari, Ping-Chang Kuo, Ana M. Gamero and Doina Ganea.Prostaglandin E2 Inhibition of IL-27 Production in Murine Dendritic Cells: A Novel Mechanism That Involves IRF1.J immunol.2016

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    2017-06-06 gwc392
  3. [GetPortalCommentsPageByObjectIdResponse(id=1910917, encodeId=c3ea191091eb5, content=<a href='/topic/show?id=04d99206316' target=_blank style='color:#2F92EE;'>#调节机制#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=97, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=92063, encryptionId=04d99206316, topicName=调节机制)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=bf1b289, createdName=villahu, createdTime=Sun Feb 12 21:43:00 CST 2017, time=2017-02-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1682280, encodeId=dd91168228047, content=<a href='/topic/show?id=d4d031e8074' target=_blank style='color:#2F92EE;'>#分泌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=67, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=31780, encryptionId=d4d031e8074, topicName=分泌)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=0da227938338, createdName=gwc392, createdTime=Tue Jun 06 05:43:00 CST 2017, time=2017-06-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1626029, encodeId=76bd162602917, content=<a href='/topic/show?id=87369652f3' target=_blank style='color:#2F92EE;'>#IL-2#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=64, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=9652, encryptionId=87369652f3, topicName=IL-2)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ea8220955712, createdName=tomyang93, createdTime=Fri Jan 13 03:43:00 CST 2017, time=2017-01-13, status=1, ipAttribution=)]
    2017-01-13 tomyang93
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