Circulation:Par4缺失可增加心肌梗死后的心脏破裂风险

2020-08-27 QQY MedSci原创

心脏破裂是急性心肌梗死(MI)的主要致死并发症。虽然再灌注策略取得了重大进展,但心脏破裂的死亡率仍然很高。研究表明,溶栓治疗可加速心脏破裂,但这一危险因素的相关性仍存在争议。

心脏破裂是急性心肌梗死(MI)的主要致死并发症。虽然再灌注策略取得了重大进展,但心脏破裂的死亡率仍然很高。研究表明,溶栓治疗可加速心脏破裂,但这一危险因素的相关性仍存在争议。
Kolpakov等分析了MI小鼠心脏的蛋白酶激活受体4(Par4)的表达,研究了Par4缺失对MI后的心室重塑和心功能的影响。
结果发现,Par4在MI后的小鼠心脏和分离的心肌细胞中的mRNA和蛋白水平均增加,以响应肥厚和炎症刺激。在急性MI后,与野生型(WT)相比,Par4缺陷小鼠的心肌细胞凋亡更少、梗死面积更小和功能恢复更好。相反,在慢性MI后,与WT小鼠相比,Par4-/-小鼠的心功能受损、心脏破裂率及死亡率均更高。
对Par4-/-小鼠心脏的病理评估显示,与WT相比,心肌梗死扩张更大、出血增多、中性粒细胞蓄积延迟,导致心肌梗死后愈合受损。
在体外和体内心肌梗死后,Par4缺乏还可减弱中性粒细胞的凋亡,并影响梗死心肌的炎症溶解。给WT小鼠输注Par4-/-中性粒细胞可延缓炎症的消退,增加心脏出血,并会加重心功能障碍,但输注Par-/-血小板无此效应。与此类似,给Par4-/-小鼠输注WT中性粒细胞可以恢复炎症的消退,降低心脏破裂发生率,并改善心肌梗死后的心功能。
 
结论:本研究揭示了Par4在心肌愈合过程中中性粒细胞凋亡和炎症消退中的重要作用,提示Par4抑制或可作为潜在的治疗靶点,且只适用于缺血损伤的急性期,不可作为MI的长期治疗
 
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    2021-11-04 ms9000000466496502

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    2020-10-25 清幽蓝燕yan

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    2020-08-29 qinqiyun

    good

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=1066954, encodeId=933b1066954c8, content=标记, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=0a3f5473270, createdName=ms9000000466496502, createdTime=Thu Nov 04 15:31:57 CST 2021, time=2021-11-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2041717, encodeId=df172041e17f4, content=<a href='/topic/show?id=9ce4e34862a' target=_blank style='color:#2F92EE;'>#破裂风险#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=45, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=73486, encryptionId=9ce4e34862a, topicName=破裂风险)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=21015, createdName=heli0118, createdTime=Tue Apr 27 07:06:40 CST 2021, time=2021-04-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=894385, encodeId=e2f08943851a, content=新文章, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTJHmctib8wsjB1Y0etxU20nsCbR8rZ2fpibp2STmwH2YzicIsTe9oHRGB6XIMeBqNdIvxODicmzfeQibIw/132, createdBy=82211964557, createdName=清幽蓝燕yan, createdTime=Sun Oct 25 20:08:51 CST 2020, time=2020-10-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1623124, encodeId=3b1516231246d, content=<a href='/topic/show?id=09c751628fe' target=_blank style='color:#2F92EE;'>#心脏破裂#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=51628, encryptionId=09c751628fe, topicName=心脏破裂)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=bee920492824, createdName=liye789132258, createdTime=Sat Aug 29 11:06:40 CST 2020, time=2020-08-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=880513, encodeId=cffe8805138f, content=good, beContent=null, objectType=article, channel=null, level=null, likeNumber=98, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20210725/69b5882b3c3845c19efa131b4ff8b1f7/06ccd8f1857e4e14862049ab235618eb.jpg, createdBy=74c72110107, createdName=qinqiyun, createdTime=Sat Aug 29 00:01:16 CST 2020, time=2020-08-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=814309, encodeId=79048143094c, content=标记一下回头来看, beContent=null, objectType=article, channel=null, level=null, likeNumber=76, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=8ce05381686, createdName=ms4000002082197205, createdTime=Thu Aug 27 21:52:16 CST 2020, time=2020-08-27, status=1, ipAttribution=)]
    2020-08-27 ms4000002082197205

    标记一下回头来看

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