Role of microRNAs in kidney sodium regulation

 描述（由申请人提供）：本提案将研究小的非编码RNA（称为microRNA（miR））在远端肾单位钠（Na+）转运调节中的作用。我们将研究盐皮质激素醛固酮调节远端肾单位皮质集合管（CCD）中特定miR簇表达的假设，通过靶向支架蛋白interstin-2的表达来改变Na+转运。使用体内小鼠模型，我们将在CCD的主要细胞中建立miR的调节。将确定由醛固酮和与钠调节相关的其他信号传导途径改变的显著调节的miR。我们将改变miR-23~24~27簇的表达，以证明其在维持肾脏钠平衡中的重要性。最后，将确定interstin-2调节上皮钠通道的机制，以表征这种新的醛固酮抑制蛋白参与肾脏中的Na+调节。

 DESCRIPTION (provided by applicant): This proposal will investigate the role of small non-coding RNAs, termed microRNAs (miRs), in the regulation of sodium (Na+) transport in the distal kidney nephron. We will investigate the hypothesis that the mineralocorticoid hormone, aldosterone regulates the expression of specific miR clusters in the distal kidney nephron cortical collecting duct (CCD), to alter Na+ transport by targeting the expression of the scaffold protein intersectin-2. Using in vivo mouse models we will establish the regulation of miRs in the principal cells of the CCD. The significantly regulated miRs that are altered by aldosterone and other signaling pathways linked to sodium regulation will be determined. We will alter the expression of the miR-23~24~27 clusters to demonstrate its importance in maintaining sodium balance in the kidney. Finally the mechanism of intersectin-2 regulation of the epithelial sodium channel will be determined, to characterize the involvement of this novel aldosterone-repressed protein in Na+ regulation in the kidney.