Hypertension:在体内,AngII是否真的可调控肾素表达系统?

2018-04-21 MedSci MedSci原创

肾素-血管紧张素-醛固酮系统的活性由肾脏释放蛋白酶肾素所触发激活,反过来又通过负反馈控制肾素分泌。广泛认为血管紧张素II(Ang II)通过由I型血管AngII(AT1)受体介导的对肾素分泌细胞(RPCs)产生影响的短环反馈直接抑制肾素表达和分泌。由于这种直接短环负反馈调控的概念,主要来源于体外实验,未在体内进行过系统性证实,现Bjoern Neubauer等人通过在RPCs缺乏Ang II-AT

肾素-血管紧张素-醛固酮系统的活性由肾脏释放蛋白酶肾素所触发激活,反过来又通过负反馈控制肾素分泌。广泛认为血管紧张素II(Ang II)通过由I型血管AngII(AT1)受体介导的对肾素分泌细胞(RPCs)产生影响的短环反馈直接抑制肾素表达和分泌。

由于这种直接短环负反馈调控的概念,主要来源于体外实验,未在体内进行过系统性证实,现Bjoern Neubauer等人通过在RPCs缺乏Ang II-AT1受体的小鼠上研究肾素合成和分泌的调控来验证这一概念的有效性。

研究人员发现肾脏的RPCs可表达Ang II-AT1受体。而条件性敲除RPCs的Ang II-AT1受体的小鼠的肾素细胞数量、肾脏肾素mRNA和血浆肾素浓度均正常。这些小鼠的肾素表达和分泌对AngI(血管紧张素I)-转化酶的抑制作用和输注AngII的反应与在野生型(WT)对照小鼠上的相似。

总而言之,本研究未得到证据支持RPCs上的AngII-AT1受体对小鼠肾素表达和分泌的正常调控有重要意义。因此,Bjoern Neubauer等人怀疑AngII在RPCs上是否真的存在直接负反馈功能。

原始出处:

Bjoern Neubauer,et al.Angiotensin II Short-Loop Feedback.Hypertension. April 16,2018.https://doi.org/10.1161/HYPERTENSIONAHA.117.10357

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    2019-02-18 feather89
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    2018-04-21 大爰

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