Cell Death Dis:HMGA1通过抑制自噬加重糖尿病心肌病患者的心功能不全

2020-03-17 MedSci原创 MedSci原创

流行病学研究表明,糖尿病(DM)与心力衰竭(HF)密切相关;在2型糖尿病的患者人群中,心力衰竭比心肌梗塞更为常见。结构转录因子HMGA1,对糖尿病心肌病的心脏重塑的影响尚不明确。

流行病学研究表明,糖尿病(DM)与心力衰竭(HF)密切相关;在2型糖尿病的患者人群中,心力衰竭比心肌梗塞更为常见。HMGA1作为一种结构转录因子,在分子及细胞水平上参与细胞周期进程、胚胎发育、肿瘤转化、分化、凋亡细胞代谢及DNA修复等一系列生物学过程。然而,其对于糖尿病心肌病中的心脏重塑(指心脏炎症、细胞凋亡及功能障碍)的影响目前尚不清楚。

在该研究中,研究人员发现HMGA1在糖尿病小鼠的心脏及高糖刺激处理的心肌细胞中高表达。过表达HMGA1能够加速高糖诱导的心肌细胞炎症及细胞凋亡反应,而敲低HMGA1可以缓解这些反应。在链霉素诱导的糖尿病小鼠模型中,通过AAV9病毒转运系统在小鼠心脏中过表达HMGA1则会恶化炎症反应、增加细胞凋亡反应,并加速心脏功能障碍。通过AAV9-shHMGA1敲低内源HMGA1可以改善糖尿病小鼠的心脏重塑。

机制研究发现,HMGA1可以通过调节P27/CDK2/mTOR信号转导通路来抑制自噬形成,而非降解。 敲低CDK2或过表达P27可缓解过表达HMGA1所诱导的体外恶化作用。在糖尿病小鼠心脏中,过表达P27能够抵消过表达HMGA1诱导的心脏重塑恶化。荧光素酶报告基因实验证实,HMGA1对于P27的调节作用主要是由miR-222所介导的。此外,miR-222拮抗剂可以抵消过表达HMGA1所诱导的恶化作用。

综上所述,HMGA1可以通过直接调节miR-222启动子活性,加强P27/mTOR诱导的自噬反应,进而提高糖尿病心肌病的发病风险。

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    2020-04-05 docwu2019
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  6. [GetPortalCommentsPageByObjectIdResponse(id=1871611, encodeId=071318e1611c6, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=45, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Tue Nov 17 22:53:52 CST 2020, time=2020-11-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2013217, encodeId=d514201321eb2, content=<a href='/topic/show?id=7d69598468' target=_blank style='color:#2F92EE;'>#Dis#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5984, encryptionId=7d69598468, topicName=Dis)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c689267, createdName=cmj8wellington, createdTime=Wed Jan 13 01:53:52 CST 2021, time=2021-01-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1961904, encodeId=fbe0196190449, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=43, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a12645, createdName=docwu2019, createdTime=Sun Apr 05 12:53:52 CST 2020, time=2020-04-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1378773, encodeId=892a13e877373, content=<a href='/topic/show?id=b60d5089495' target=_blank style='color:#2F92EE;'>#心功能不全#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=54, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=50894, encryptionId=b60d5089495, topicName=心功能不全)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=d784426, createdName=isabellayj, createdTime=Thu Mar 19 11:53:52 CST 2020, time=2020-03-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1465699, encodeId=0baa14656999a, content=<a href='/topic/show?id=5f5f508933f' target=_blank style='color:#2F92EE;'>#心功能#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=65, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=50893, encryptionId=5f5f508933f, topicName=心功能)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6df96750284, createdName=caobinglei8081, createdTime=Thu Mar 19 11:53:52 CST 2020, time=2020-03-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1531544, encodeId=20b4153154436, content=<a href='/topic/show?id=770e5e9457' target=_blank style='color:#2F92EE;'>#Death#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=26, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5794, encryptionId=770e5e9457, topicName=Death)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=32e312278742, createdName=cy0328, createdTime=Thu Mar 19 11:53:52 CST 2020, time=2020-03-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1622441, encodeId=44701622441eb, content=<a href='/topic/show?id=b9578094833' target=_blank style='color:#2F92EE;'>#肌病#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=26, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=80948, encryptionId=b9578094833, topicName=肌病)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=395f25, createdName=爆笑小医, createdTime=Thu Mar 19 11:53:52 CST 2020, time=2020-03-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1043008, encodeId=b76410430085b, content=谢谢MedSci提供最新的资讯, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0620, createdName=misszhang, createdTime=Tue Mar 17 23:53:52 CST 2020, time=2020-03-17, status=1, ipAttribution=)]
    2020-03-19 cy0328
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    2020-03-17 misszhang

    谢谢MedSci提供最新的资讯

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 糖尿病心肌病(DCM)是由糖尿病引起的、以左室舒张和(或)收缩功能障碍为表现的心肌病变,且与高血压性心脏病、冠状动脉粥样硬化性心脏病、心脏瓣膜病及其他心脏病变无关。该疾病在代谢紊乱及微血管病变的基础上引发心肌广泛灶性坏死,出现亚临床心功能异常,最终进展为心力衰竭、心律失常及心源性休克,重症患者甚至发生猝死。   潘静, 美国心脏学会(AHA)、美国糖尿病学会(ADA)会员,美国得克萨斯A&

Diabetes:MICU1通过线粒体Ca2+依赖的抗氧化反应缓解糖尿病心肌病!

总的来说,该研究结果首次提供了直接证据证实上调MICU1可以保护db/db小鼠的心脏功能,这表明增加MICU1的表达或活性可能是改善心肌病糖尿病的一种药物治疗方法。