Hepatology:研究揭示iNKT抑制肝脏再生的机制

2020-03-18 MedSci原创 MedSci原创

不变的自然杀伤T(iNKT)细胞是在肝脏中发现的淋巴细胞的主要子集。这些细胞介导各种功能,包括肝损伤,纤维化和癌变。但是,iNKT细胞在肝再生中的功能仍不清楚。

不变的自然杀伤T(iNKT)细胞是在肝脏中发现的淋巴细胞的主要子集。这些细胞介导各种功能,包括肝损伤,纤维化和癌变。但是,iNKT细胞在肝再生中的功能仍不清楚。

 

在本研究中,采用部分肝切除术(PHx)研究肝再生。使用iNKT细胞的特异性配体α-GalCer诱导iNKT细胞活化。PHx后,两株iNKT细胞缺陷型小鼠CD1d-/-和Jα281-/-小鼠表现出正常的肝再生。在PHx之前或之后注射α-GalCer可迅速刺激iNKT细胞产生IFN-γ和IL-4,从而显著抑制肝脏再生。IFN-γ的体外治疗抑制了肝细胞增殖。与该体外发现一致,IFN-γ或其下游信号分子信号转导子和转录激活子(STAT)1的遗传破坏显着消除了α-GalCer介导的肝再生抑制作用。体外暴露于IL-4不会影响肝细胞增殖,但令人惊讶的是,IL-4或其下游信号分子STAT6的遗传消融部分消除了α-GalCer对肝脏再生的抑制作用。进一步的研究表明,IL-4有助于α-GalCer诱导的iNKT细胞扩增和IFN-γ产生,从而抑制肝脏再生。

 

总之,在健康条件下,iNKT细胞在控制PHx后的肝再生中起次要作用。α-GalCer激活iNKT细胞会诱导IFN-γ的产生,直接抑制肝脏的再生;IL-4会通过刺激iNKT细胞的扩增和IFN-γ的产生而间接地减弱肝脏的再生。

 

原始出处:

 

Shi YinHua Wang, et al., Activation of invariant natural killer T cells impedes liver regeneration via both IFN-γ- and IL-4-dependent mechanisms. Hepatology. 2014 Oct; 60(4): 1356–1366. doi: 10.1002/hep.27128

 

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    2021-01-14 xuruicheng
  2. [GetPortalCommentsPageByObjectIdResponse(id=1751740, encodeId=23aa1e51740ca, content=<a href='/topic/show?id=ba8612842b3' target=_blank style='color:#2F92EE;'>#NKT#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=32, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12842, encryptionId=ba8612842b3, topicName=NKT)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=74e936405699, createdName=xuruicheng, createdTime=Thu Jan 14 01:40:43 CST 2021, time=2021-01-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1989641, encodeId=dcda198964167, content=<a href='/topic/show?id=13c698665d' target=_blank style='color:#2F92EE;'>#iNKT#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=9866, encryptionId=13c698665d, topicName=iNKT)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=930e243, createdName=dingxiaobo, createdTime=Sun Dec 20 11:40:43 CST 2020, time=2020-12-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1427404, encodeId=512f142e40476, content=<a href='/topic/show?id=221d685172' target=_blank style='color:#2F92EE;'>#EPA#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=21, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6851, encryptionId=221d685172, topicName=EPA)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=4a9b4077760, createdName=gwc384, createdTime=Fri Mar 20 10:40:43 CST 2020, time=2020-03-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1524077, encodeId=a6e915240e77e, content=<a href='/topic/show?id=07d0814257c' target=_blank style='color:#2F92EE;'>#肝脏再生#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81425, encryptionId=07d0814257c, topicName=肝脏再生)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=fc5711566942, createdName=echonoir, createdTime=Fri Mar 20 10:40:43 CST 2020, time=2020-03-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1039208, encodeId=a0ad10392081d, content=机制研究离临床仍然有距离,不过与临床结合思考,仍然有帮助的,不能仅仅是纯临床思维,转化思维同样重要, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0620, createdName=肿肿, createdTime=Wed Mar 18 22:40:43 CST 2020, time=2020-03-18, status=1, ipAttribution=)]
    2020-12-20 dingxiaobo
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    2020-03-20 gwc384
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    2020-03-18 肿肿

    机制研究离临床仍然有距离,不过与临床结合思考,仍然有帮助的,不能仅仅是纯临床思维,转化思维同样重要

    0