Circ Res:缺血性心律失常导致心室重构的新机制

2017-04-17 MedSci MedSci原创

室性心律失常仍然是心肌缺血患者死亡的主要原因。髓过氧化物酶(MPO)是由中性粒细胞释放的血红素酶,其在缺血的心肌内积聚,并与左心室重构有关。近期,一项发表在杂志Circ Res上的研究旨在揭示MPO对室性心律失常发展的作用。研究者们在不同的心肌缺血模型中进行试验,予以异丙肾上腺素注射后遥测ECG。结果发现,MPO缺乏严重降低了室性心动过速(VT)对右心室和爆发刺激的脆弱性。使用CD11b / CD

室性心律失常仍然是心肌缺血患者死亡的主要原因。髓过氧化物酶(MPO)是由中性粒细胞释放的血红素酶,其在缺血的心肌内积聚,并与左心室重构有关。


近期,一项发表在杂志Circ Res上的研究旨在揭示MPO对室性心律失常发展的作用。

研究者们在不同的心肌缺血模型中进行试验,予以异丙肾上腺素注射后遥测ECG。结果发现,MPO缺乏严重降低了室性心动过速(VT)对右心室和爆发刺激的脆弱性。

使用CD11b / CD18-整联蛋白缺陷型(CD11b -/-)小鼠并静脉注射MPO后显示,嗜中性粒细胞的浸润是心肌中MPO积累的先决条件。来自MPO缺陷型(Mpo -/-)小鼠的心肌显示,与WT小鼠相比,其有更明显的减慢和减少围手术期的电传导异质性。与Mpo -/-小鼠相比,氧化还原敏感性间隙连接蛋白连接蛋白43(Cx43)在野生型小鼠心肌梗死面积周围的表达降低。在分离的WT小鼠心肌细胞中,Cx43蛋白含量在MPO / H2O2诱导后降低。

诱导多能干细胞衍生的心肌细胞(iPSCM)网和体内研究将Cx43的分解与基质金属蛋白酶7的MPO依赖性活化相关联。

Mpo-/-小鼠显示肌成纤维细胞的积累减少,表明心肌缺血后纤维化减少。体外研究证明MPO通过激活p38丝裂原活化蛋白激酶(MAPK)诱导成纤维细胞对肌成纤维细胞转分化,导致胶原蛋白的产生上调。

此外,在2622例射血分数高于35%的稳定患者中发现,基线MPO血浆水平与室性心律失常,心源性猝死或植入式心律转复除颤器植入史独立相关。

此项研究表明:MPO作为缺血后心肌重塑的重要调控因子,可能作为心肌缺血后继发性疾病预防的新型药理学靶点。

原始出处:
Mollenhauer M, Friedrichs K, et al. Myeloperoxidase Mediates Postischemic Arrhythmogenic Ventricular Remodeling. Circ Res. 2017 Apr 12. pii: CIRCRESAHA.117.310870. doi: 10.1161/CIRCRESAHA.117.310870. 

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    2017-04-20 龙胆草

    学习了,谢谢分享

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    2017-04-19 往日如昨

    学习了谢谢分享

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    2017-04-18 flysky120

    谢谢,分享的文章

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=1892853, encodeId=1aea18928535a, content=<a href='/topic/show?id=c738e93521f' target=_blank style='color:#2F92EE;'>#缺血性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=26, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=79352, encryptionId=c738e93521f, topicName=缺血性)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=66ec123, createdName=guihongzh, createdTime=Fri Jan 12 04:52:00 CST 2018, time=2018-01-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=188969, encodeId=435218896956, content=学习了,谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4Nd44v3xHnnictn9UpctwtH62EPQ59TMdI9lnqHMgQ16nH7GmGCfpzicsHgjibYVk6vwSpXrC86gMibRkoaIzf5HwSz7/0, createdBy=78cc1691107, createdName=龙胆草, createdTime=Thu Apr 20 05:59:24 CST 2017, time=2017-04-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1297772, encodeId=4fde129e77204, content=<a href='/topic/show?id=33c1509e135' target=_blank style='color:#2F92EE;'>#心室重构#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=50971, encryptionId=33c1509e135, topicName=心室重构)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=80ca273, createdName=fanweitanzhen, createdTime=Wed Apr 19 11:52:00 CST 2017, time=2017-04-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=188751, encodeId=d694188e51f7, content=学习了谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c0a61971598, createdName=往日如昨, createdTime=Wed Apr 19 09:46:35 CST 2017, time=2017-04-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=188473, encodeId=65661884e30e, content=谢谢,分享的文章, beContent=null, objectType=article, channel=null, level=null, likeNumber=19, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160718/IMG578C993D395567540.jpg, createdBy=59b81918946, createdName=flysky120, createdTime=Tue Apr 18 08:57:18 CST 2017, time=2017-04-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=188305, encodeId=12eb1883055b, content=感谢分享一下!, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=20971999626, createdName=laymankey, createdTime=Mon Apr 17 21:27:47 CST 2017, time=2017-04-17, status=1, ipAttribution=)]
    2017-04-17 laymankey

    感谢分享一下!

    0

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