Rabbit distal convoluted tubule coexpresses NaCl cotransporter and 11 beta-hydroxysteroid dehydrogenase II mRNA.

Rabbit distal convoluted tubule coexpresses NaCl cotransporter and 11 beta-hydroxysteroid dehydrogenase II mRNA.
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兔远曲小管共表达 NaCl 协同转运蛋白和 11 β-羟基类固醇脱氢酶 II mRNA。

DOI:
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发表时间:
1998
影响因子:
19.6
通讯作者:
D. Ellison
D. Ellison
中科院分区:
医学1区
文献类型:
--
作者:
H. Velázquez;A. Náray;T. Silva;E. Andújar;R. Reilly;G. Desir;D. Ellison

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背景 虽然肾皮质集合管(CCD)是醛固酮的主要靶点,但最近的证据表明,其他肾单位节段的盐转运也可能受醛固酮调节。在剥夺饮食NaCl的动物中,大鼠远曲小管(DCT)的电中性和噻嗪敏感性NaCl共转运增加。我们检验了家兔DCT是醛固酮靶组织的假设。 方法 采用单肾单位逆转录聚合酶链反应(RT-PCR)技术,检测NaCl协同转运蛋白和11 β-HSD 2 mRNA在肾单位中的表达。首先克隆了兔NaCl协同转运蛋白,并选择了兔特异性引物。开发了微量测定以评估相同肾单位节段的0.5mm样品中的11 β-HSD 2酶活性。 结果 NaCl共转运蛋白在6例近端小管(PT)、6例DCT和3例CCD中均有表达,而11 β-HSD在7例PT、7例DCT和9例CCD中均有表达。皮质酮转化为11-脱氢皮质酮在一个高的速度和相似的程度由DCT和CCD,但不是PT。 结论 我们得出结论,DCT是醛固酮作用的靶组织。沿着远端肾单位的电中性(DCT)和生电(CCD)Na转运蛋白的轴向异质性可能改善低盐和低容量状态下的钠恢复。
BACKGROUND Although the renal cortical collecting duct (CCD) is a principal target for aldosterone, recent evidence suggests that salt transport by other nephron segments may also be regulated by aldosterone. Electroneutral and thiazide-sensitive NaCl cotransport by the distal convoluted tubule (DCT) of the rat is increased in animals deprived of dietary NaCl. We tested the hypothesis that the DCT of the rabbit is an aldosterone target tissue. METHODS The single-nephron reverse-transcriptase/polymerase chain reaction (RT-PCR) technique was used to determine mRNA expression of NaCl cotransporter and 11 beta-HSD 2 in dissected nephron segments. The rabbit NaCl cotransporter was first cloned and rabbit-specific primers selected. A micro-assay was developed to assess 11 beta-HSD 2 enzyme activity in 0.5 mm samples of the same nephron segments. RESULTS NaCl cotransporter was expressed in 0 of 6 proximal tubule (PT), 6 of 6 DCT and 3 of 6 CCD samples, while 11 beta-HSD was found in 0 of 7 PT, 7 of 7 DCT and 9 of 9 CCD samples. Corticosterone was converted to 11-dehydrocorticosterone at a high rate and to a similar extent by both the DCT and CCD, but not the PT. CONCLUSIONS We conclude that the DCT is a target tissue for the action of aldosterone. Axial heterogeneity of electroneutral (in DCT) and electrogenic (in CCD) Na transporters along the distal nephron may improve sodium recovery in low salt and volume states.
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