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CLIN CHEM:血清制备过程产生的小分子会影响心肌梗死的诊断?

2017-06-01 MedSci MedSci原创

心肌肌钙蛋白T(cTnT)是目前已知急性心肌梗死(AMI)的公认生物标志,但是它在血清中易于被蛋白水解降解。这种降解通常归因于μ钙蛋白酶的作用,尽管也可能有其它原因。近日,临床化学杂志(Clinical Chemistry)在线发表了一项采用免疫印迹和质谱(MS)分析方法研究 cTnT降解的研究。在本研究中,研究人员探讨了血清样品制备的过程中凝血酶介导的cTnT切割发生的假说。

心肌肌钙蛋白TcTnT)是目前已知急性心肌梗死AMI)的公认生物标志,但是它在血清中易于被蛋白水解降解。这种降解通常归因于μ钙蛋白酶的作用,尽管也可能有其它原因。近日,临床化学杂志(Clinical Chemistry)在线发表了一项采用免疫印迹和质谱(MS)分析方法研究 cTnT降解的研究。在本研究中,研究人员探讨了血清样品制备的过程中凝血酶介导的cTnT切割发生的假说。

AMI肝素血浆和血清样品中分离的cTnT的比较显示,血浆样品中的cTnT主要作为全长分子(约35kDa)存在,而在血清样品中,其仅仅以29kDa的片段存在。重组cTnT或天然三元心肌肌钙蛋白复合物与凝血酶或正常人血清(NHS)孵育导致形成与AMI血清样品中检测到的29kDa产物相似的29-kDa的产物。当凝血酶或NHS用水蛭素(凝血酶的特异性抑制剂)提前处理,或在正常肝素血浆中培养肌钙蛋白时,没有观察到cTnT发生降解。当通过MS分析凝血酶介导的cTnT蛋白水解产物时,鉴定出由氨基酸残基(aar2-6869-288组成的2个片段,这表明凝血酶在R68S69之间的切割cTnT

研究结果表明,AMI血清样品中cTnT29kDa片段主要是由血清样品制备过程中凝血酶裂解所产生的。

原始出处:

Ivan A. Katrukha, Alexander E. Kogan, Alexandra V. et al. Thrombin-Mediated Degradation of Human Cardiac Troponin T.Clinical Chemistry Jun 2017, 63 (6) 1094-1100; DOI: 10.1373/clinchem.2016.266635

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    2017-07-06 宋威
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    2017-06-03 changjiu

    学习了

    0

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    2017-06-03 明天会更好!

    学习过了,感谢分享!

    0

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    2017-06-02 明天会更好!

    谢谢分享,学习了!!!

    0

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    2017-06-02 明月清辉

    谢谢分享,学习了

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=1914643, encodeId=69131914643bc, content=<a href='/topic/show?id=84d7469559b' target=_blank style='color:#2F92EE;'>#小分子#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=112, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=46955, encryptionId=84d7469559b, topicName=小分子)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6105386, createdName=宋威, createdTime=Thu Jul 06 02:29:00 CST 2017, time=2017-07-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=205987, encodeId=e34f20598e02, content=学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=136, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3zSn0GqHrsfLGSUSR8zwnWWLT4FMl5XH8S58HuZslVkLsAPbXDXaliagK7TOxQfmngKibG1yrDonepCLDkcxGk8hS/0, createdBy=b8282062892, createdName=changjiu, createdTime=Sat Jun 03 11:27:12 CST 2017, time=2017-06-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=205955, encodeId=9ddd2059556a, content=学习过了,感谢分享!, beContent=null, objectType=article, channel=null, level=null, likeNumber=89, 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=Sat Jun 03 10:08:57 CST 2017, time=2017-06-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=205557, encodeId=340120555e93, content=谢谢分享,学习了!!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=105, 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=Fri Jun 02 09:22:17 CST 2017, time=2017-06-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=205521, encodeId=fbd9205521cd, content=谢谢分享,学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=140, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6Nx0VGA4QMDzOP8oAgnV4h51EjSfehJ9QxyiaSmw8PB56BhY8KXFSxHCibXrzcy4abrzSibXQPxJ9kzrLcJyhhB8a/0, createdBy=1d3b1672603, createdName=明月清辉, createdTime=Fri Jun 02 08:15:11 CST 2017, time=2017-06-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=205433, encodeId=8ce12054331c, content=值得推荐一下, beContent=null, objectType=article, channel=null, level=null, likeNumber=88, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/ajNVdqHZLLBWOEtiahpXHGVdbFId5PLgK775YNA1ria3lM9KsJT6iczgIhov5sobd1Nr0raUBP58GkUDzvfDic9RCg/0, createdBy=0d021989245, createdName=189****1577, createdTime=Fri Jun 02 05:59:27 CST 2017, time=2017-06-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=205428, encodeId=ea5d205428e9, content=谢谢了,学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=112, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=30331616752, createdName=txqjm, createdTime=Fri Jun 02 05:40:57 CST 2017, time=2017-06-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=205423, encodeId=1d0e20542306, content=有意义的事!, beContent=null, objectType=article, channel=null, level=null, likeNumber=81, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRkia1DP5MpwEgtXo1XhXA11xD6MWKxunAZFXKSNic0fWHUQx83oNHPlRMxxIctM83QKeCLkJpMibibiaC/0, createdBy=7e581734408, createdName=深海的鱼, createdTime=Fri Jun 02 05:15:57 CST 2017, time=2017-06-02, status=1, ipAttribution=)]
    2017-06-02 189****1577

    值得推荐一下

    0

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    2017-06-02 txqjm

    谢谢了,学习

    0

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    2017-06-02 深海的鱼

    有意义的事!

    0

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