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KIDNEY INT:肾小管NHE3是维持水和氯化钠平衡所必需的!

2017-04-05 xing.T MedSci原创

因此,当膳食中氯化钠摄入量变化时,肾脏NHE3在维持血压和血钠水平稳态上是必需的。

钠/质子交换蛋白3(NHE3)在小肠和肾脏中均有表达,它有利于钠的(重)吸收和质子分泌。相对于肠道,NHE3在肾脏中维持氯化钠平衡的重要性仍是未知。近日,肾脏病领域权威杂志kidney international上针对这一问题发表了一篇研究文章。

研究人员发现组成性小管特异性NHE3基因敲除小鼠(NHE3loxloxCre)在体重、血液pH值和碳酸氢盐、血浆中钠、钾、醛固酮水平方面与对照小鼠相比并没有表现出显著的差异。但在液体摄入量、尿流率、尿钠/尿肌酐和尿pH值方面,NHE3loxloxCre小鼠明显升高,而尿渗透压和肾小球滤过率明显降低。控制饮食的NHE3loxloxCre小鼠进行水剥夺后出现了一个小的尿浓缩缺陷,加重了低氯化钠水平。研究人员将对照小鼠进行10天的低氯化钠或高氯化钠饮食并不会影响小鼠血浆钠水平;然而,NHE3loxloxCre小鼠则易受低氯化钠(约4mM)或高氯化钠(约2mM)摄入影响,但对血浆醛固酮浓度的影响两组间也没有差异。

NHE3loxloxCre小鼠中血压明显降低,并且对氯化钠敏感。在对照小鼠中,钠/磷协同转运蛋白Npt2c的表达对氯化钠敏感。然而,肾小管NHE3缺乏降低了Npt2c的表达。钠/氯协同转运体和其58位苏氨酸磷酸化水平在NHE3loxloxCre小鼠中明显增加,同样上皮钠通道α-亚基及其裂解形式在NHE3loxloxCre小鼠中也都明显增加。

因此,当膳食中氯化钠摄入量变化时,肾脏NHE3在维持血压和血钠水平稳态上是必需的。

原始出处:


Robert A. Fenton,et al. Renal tubular NHE3 is required in the maintenance of water and sodium chloride homeostasis.kidney-international.2017. http://www.kidney-international.org/article/S0085-2538(17)30096-0/fulltext

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  2. [GetPortalCommentsPageByObjectIdResponse(id=2080275, encodeId=0fcc20802e5df, content=<a href='/topic/show?id=73b88253ed5' target=_blank style='color:#2F92EE;'>#肾小管#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=108, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=82537, encryptionId=73b88253ed5, topicName=肾小管)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e07307, createdName=lingaifan, createdTime=Wed Jan 24 20:15:00 CST 2018, time=2018-01-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2036830, encodeId=5b2a203683089, content=<a href='/topic/show?id=c06f12e76a2' target=_blank style='color:#2F92EE;'>#NHE3#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=86, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12776, encryptionId=c06f12e76a2, topicName=NHE3)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=ec53439, createdName=zhty5337, createdTime=Tue Aug 15 08:15:00 CST 2017, time=2017-08-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1603018, encodeId=d9a01603018ba, content=<a href='/topic/show?id=81b91049067' target=_blank style='color:#2F92EE;'>#kidney#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=86, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10490, encryptionId=81b91049067, topicName=kidney)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c36e18990621, createdName=gwc389, createdTime=Fri Apr 07 10:15:00 CST 2017, time=2017-04-07, status=1, ipAttribution=)]
    2017-08-15 zhty5337
  3. [GetPortalCommentsPageByObjectIdResponse(id=2080275, encodeId=0fcc20802e5df, content=<a href='/topic/show?id=73b88253ed5' target=_blank style='color:#2F92EE;'>#肾小管#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=108, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=82537, encryptionId=73b88253ed5, topicName=肾小管)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e07307, createdName=lingaifan, createdTime=Wed Jan 24 20:15:00 CST 2018, time=2018-01-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2036830, encodeId=5b2a203683089, content=<a href='/topic/show?id=c06f12e76a2' target=_blank style='color:#2F92EE;'>#NHE3#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=86, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12776, encryptionId=c06f12e76a2, topicName=NHE3)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=ec53439, createdName=zhty5337, createdTime=Tue Aug 15 08:15:00 CST 2017, time=2017-08-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1603018, encodeId=d9a01603018ba, content=<a href='/topic/show?id=81b91049067' target=_blank style='color:#2F92EE;'>#kidney#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=86, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10490, encryptionId=81b91049067, topicName=kidney)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c36e18990621, createdName=gwc389, createdTime=Fri Apr 07 10:15:00 CST 2017, time=2017-04-07, status=1, ipAttribution=)]
    2017-04-07 gwc389
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