MOL CELL:饥饿为何也能引起脂肪肝?

2020-06-10 MedSci原创 MedSci原创

已有的研究显示,自噬能够被长期禁食激活,但不能克服随之而来的肝脏脂质超载,导致脂肪肝。

已有的研究显示,自噬能够被长期禁食激活,但不能克服随之而来的肝脏脂质超载,导致脂肪肝。

最近,研究人员发现了一个限制自噬降解脂质的过氧体-溶酶体代谢环节。酰基辅酶A氧化酶1(Acox1)是催化过氧体β-氧化的第一步的酶,其在肝脏中富集,并随着空腹或高脂饮食(HFD)进一步增加。

肝脏特异性Acox1基因敲除(Acox1-LKO)可保护小鼠免受饥饿或HFD引起的肝脏脂肪变性,原因是诱导脂滴的自噬降解。肝脏Acox1缺失明显降低了细胞总乙酰辅酶A水平,导致Raptor蛋白乙酰化减少,mTOR的溶酶体定位减少,导致自噬的中枢调节因子mTORC1的激活受损。

二氯乙酸处理可提高乙酰辅酶A水平,恢复mTORC1激活,抑制自噬,并增加Acox1-LKO小鼠的肝脏甘油三酯。

这些结果确定了过氧化物酶体衍生的乙酰辅酶A是控制肝脏脂质稳态的自噬的关键代谢调节剂。

 

原始出处:

Anyuan He et al. Acetyl-CoA Derived from Hepatic Peroxisomal β-Oxidation Inhibits Autophagy and Promotes Steatosis via mTORC1 Activation. Molecular Cell (2020). DOI:https://doi.org/10.1016/j.molcel.2020.05.007

 

 

版权声明:
本网站所有内容来源注明为“梅斯医学”或“MedSci原创”的文字、图片和音视频资料,版权均属于梅斯医学所有。非经授权,任何媒体、网站或个人不得转载,授权转载时须注明来源为“梅斯医学”。其它来源的文章系转载文章,或“梅斯号”自媒体发布的文章,仅系出于传递更多信息之目的,本站仅负责审核内容合规,其内容不代表本站立场,本站不负责内容的准确性和版权。如果存在侵权、或不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
在此留言
评论区 (3)
#插入话题
  1. [GetPortalCommentsPageByObjectIdResponse(id=1871801, encodeId=3f3818e18016f, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Wed Nov 04 19:26:39 CST 2020, time=2020-11-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1962097, encodeId=bf2c196209e75, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Mon Feb 15 14:26:39 CST 2021, time=2021-02-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1454759, encodeId=18e11454e5958, content=<a href='/topic/show?id=d370101185d7' target=_blank style='color:#2F92EE;'>#饥饿#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=101185, encryptionId=d370101185d7, topicName=饥饿)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=5c9a5593064, createdName=guojianrong, createdTime=Fri Jun 12 01:26:39 CST 2020, time=2020-06-12, status=1, ipAttribution=)]
  2. [GetPortalCommentsPageByObjectIdResponse(id=1871801, encodeId=3f3818e18016f, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Wed Nov 04 19:26:39 CST 2020, time=2020-11-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1962097, encodeId=bf2c196209e75, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Mon Feb 15 14:26:39 CST 2021, time=2021-02-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1454759, encodeId=18e11454e5958, content=<a href='/topic/show?id=d370101185d7' target=_blank style='color:#2F92EE;'>#饥饿#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=101185, encryptionId=d370101185d7, topicName=饥饿)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=5c9a5593064, createdName=guojianrong, createdTime=Fri Jun 12 01:26:39 CST 2020, time=2020-06-12, status=1, ipAttribution=)]
    2021-02-15 维他命
  3. [GetPortalCommentsPageByObjectIdResponse(id=1871801, encodeId=3f3818e18016f, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Wed Nov 04 19:26:39 CST 2020, time=2020-11-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1962097, encodeId=bf2c196209e75, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Mon Feb 15 14:26:39 CST 2021, time=2021-02-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1454759, encodeId=18e11454e5958, content=<a href='/topic/show?id=d370101185d7' target=_blank style='color:#2F92EE;'>#饥饿#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=101185, encryptionId=d370101185d7, topicName=饥饿)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=5c9a5593064, createdName=guojianrong, createdTime=Fri Jun 12 01:26:39 CST 2020, time=2020-06-12, status=1, ipAttribution=)]

相关资讯

BMC Gastroenterol: 隔天禁食可治疗脂肪肝!?湖南学者研究称:可安全减肥且改善血脂

每10个国人中约有3个人有脂肪肝,来个“时髦”的间歇性禁食会有什么变化?

NATURE:微生物代谢膳食果糖,促进肝脏脂肪生成

饮食中的果糖通过肠道微生物转化为醋酸盐,从而独立于ACLY,提供脂肪生成所需的乙酰辅酶a。

J Diabetes Investig: 无论是否患有糖尿病,脂肪肝都会影响β细胞功能

一项最新研究发现,对于成年人来说,无论是否患有糖尿病,当肝脏中存在多余脂肪时,β细胞功能都可能会恶化。

Cell Death Dis:TNFAIP8调节细胞自噬、脂肪变性并促进肝癌细胞增殖

TNFAIP8(肿瘤坏死因子α诱导蛋白8)是TNFAIP8/TIPE蛋白家族的成员,该家族还包括TIPE1、TIPE2和TIPE3。TNFAIP8的表达与各种类型的肿瘤发生发展息息相关,其

J Nutr Biochem: 得了脂肪肝怎么办?美动物研究称,绿茶+规律锻炼或有效

近期一项美国宾州州立大学学者进行的研究提示,或者喝绿茶并规律锻炼会大大改善脂肪在肝脏的沉积。

患者很瘦,检查却有脂肪肝,要不要治疗?

越来越多体型偏瘦的患者也被检查出了脂肪肝,临床上称为「瘦人脂肪肝」,这与我们所知道的「脂肪肝与肥胖密切相关」有些矛盾,是怎么回事呢?