Autophagy:华人科学家阐述自噬如何介导肝纤维化

2017-11-22 海北 MedSci原创

细菌移位和脂多糖(LPS)泄漏发生在动物肝纤维化模型的非常早期。来自中山大学的研究人员研究了LPS在肝星状细胞(HSC)激活中的作用,以及体内和体外的潜在机制。

细菌移位和脂多糖(LPS)泄漏发生在动物肝纤维化模型的非常早期。来自中山大学的研究人员研究了LPS在肝星状细胞(HSC)激活中的作用,以及体内和体外的潜在机制。

研究人员发现,LPS的处理能够导致LX-2细胞和HSC中通过AKT-MTORAMPK-ULK1途径介导的自噬体的形成和自噬流的急剧增加。LPS可显着降低HSCs中脂质的含量,包括脂滴(LD)数量和脂质染色面积。用宏自噬 /自噬抑制剂或ATG5的沉默预处理细胞能够防止脂质含量的下降。此外,在LX-2细胞和HSC中,LPS是通过自噬 - 溶酶体途径来诱导脂质自噬的。由细胞内RA水平和Rar靶基因的减少表明,LPS诱导的自噬可以进一步减少视黄酸(RA)信号传导,导致Bambi下调,并促进HSCTGFB纤维化应答的敏感化。

与单独CCl4注射相比,CCl4LPS同时注射可以增加小鼠肝纤维化程度,其能够增加Col1a1Acta2TgfbTimp1mRNA表达,ACTA2 /α-SMACOL1A1的蛋白表达,天狼星红染色区。这些现象可以通过注入自噬抑制剂来减弱。

LPS也可以降低体内HSC中的脂质含量,这种变化可以施用氯喹(CQ)以减弱。

因此,研究人员的数据表明,LPS诱导的自噬可以导致脂滴的损失,RA信号传导功能障碍,和TGFB假受体Bambi的下调,从而使HSC对TGFB信号敏感。


原始出处:

Ming Chen et al. Lipopolysaccharide mediates hepatic stellate cell activation by regulating autophagy and retinoic acid signalingAutophagy, 2017. DOI: https://doi.org/10.1080/15548627.2017.1356550


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  3. [GetPortalCommentsPageByObjectIdResponse(id=1808171, encodeId=590818081e13b, content=<a href='/topic/show?id=f94d81342e5' target=_blank style='color:#2F92EE;'>#肝纤维#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=25, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81342, encryptionId=f94d81342e5, topicName=肝纤维)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=8942242, createdName=jj000001, createdTime=Mon May 07 03:43:00 CST 2018, time=2018-05-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1581991, encodeId=90811581991ad, content=<a href='/topic/show?id=830c35868ec' target=_blank style='color:#2F92EE;'>#华人#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=26, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=35868, encryptionId=830c35868ec, topicName=华人)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=3f7716881423, createdName=ms4468361851264128, createdTime=Fri Nov 24 12:43:00 CST 2017, time=2017-11-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=263591, encodeId=0d31263591e2, content=学习了.谢谢分享., beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160914/IMG57D82E721DB581755.jpg, createdBy=4fc81933929, createdName=明天会更好!, createdTime=Thu Nov 23 10:56:27 CST 2017, time=2017-11-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=263531, encodeId=b519263531f5, content=学习.谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyhb9xDeHojCicsdRdyC3XXdGk2ib9yLypZuHN06WeW4HO8WN0GGrgEfvnTX8gsckof05GHOU5OM4Mvx/0, createdBy=9cee1982656, createdName=执着追梦, createdTime=Thu Nov 23 07:14:37 CST 2017, time=2017-11-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=263491, encodeId=3de526349192, content=学习了很有用不错, beContent=null, objectType=article, channel=null, level=null, likeNumber=59, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Thu Nov 23 05:53:56 CST 2017, time=2017-11-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=263449, encodeId=093526344965, content=学习了.好文章, beContent=null, objectType=article, channel=null, level=null, likeNumber=1, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20220115/46bcf39c32de4aa6b45c5f9d66c8ee77/6cb4a20c55bb4b7691122f47747bfca2.jpg, createdBy=9dad1662329, createdName=1ddf0692m34(暂无匿称), createdTime=Wed Nov 22 22:32:18 CST 2017, time=2017-11-22, status=1, ipAttribution=)]
    2017-11-23 明天会更好!

    学习了.谢谢分享.

    0

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    2017-11-23 执着追梦

    学习.谢谢分享

    0

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    2017-11-23 飛歌

    学习了很有用不错

    0

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    2017-11-22 1ddf0692m34(暂无匿称)

    学习了.好文章

    0

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