Claudin-14 Regulates Renal Ca⁺⁺ Transport in Response to CaSR Signalling Via a Novel MicroRNA Pathway

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 2012 Mar 1

PMID 22373575

Citations 119

Authors

Yongfeng Gong

Vijayaram Renigunta

Nina Himmerkus

Jiaqi Zhang

Aparna Renigunta

Markus Bleich

Jianghui Hou

Affiliations

Soon will be listed here.

Abstract

The paracellular claudin channel of the thick ascending limb (TAL) of Henle is critical for Ca(++) reabsorption in the kidney. Genome-wide association studies (GWASs) have identified claudin-14 associated with hypercalciuric nephrolithiasis. Here, we show that claudin-14 promoter activity and transcript are exclusively localized in the TAL. Under normal dietary condition, claudin-14 proteins are suppressed by two microRNA molecules (miR-9 and miR-374). Both microRNAs directly target the 3'-UTR of claudin-14 mRNA; induce its mRNA decay and translational repression in a synergistic manner. Through physical interaction, claudin-14 blocks the paracellular cation channel made of claudin-16 and -19, critical for Ca(++) reabsorption in the TAL. The transcript and protein levels of claudin-14 are upregulated by high Ca(++) diet, while downregulated by low Ca(++) diet. Claudin-14 knockout animals develop hypermagnesaemia, hypomagnesiuria, and hypocalciuria under high Ca(++) dietary condition. MiR-9 and miR-374 transcript levels are regulated by extracellular Ca(++) in a reciprocal manner as claudin-14. The Ca(++) sensing receptor (CaSR) acts upstream of the microRNA-claudin-14 axis. Together, these data have established a key regulatory role for claudin-14 in renal Ca(++) homeostasis.

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