Referenced in: none

Automatically associated channels: ClC2 , ClC4

Title: Aldosterone and high-NaCl diet modulate ClC-2 chloride channel gene expression in rat kidney.

Authors: Debora S Ornellas, Danielle S Nascimento, Daniel H Christoph, William B Guggino, Marcelo M Morales

Journal, date & volume: Pflugers Arch., 2002 May , 444, 193-201

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/11976932

Abstract
It is well known that Na+ reabsorption in the kidney can be regulated by aldosterone. Although Cl- is the most abundant anion present in the extra cellular fluids the involvement of aldosterone in the regulation of Cl- conductance through Cl- channels at the molecular level is unknown. In this study, the effects of aldosterone and high-Na+ diet on the expression of ClC-2, a cell volume-, pH- and voltage-sensitive Cl- channel, was examined in the rat kidney. Total RNA isolated from Wistar rats fed a high-Na+ diet for 5 days, furosemide treatment, adrenalectomy and adrenalectomy with replacement of normal plasma levels of aldosterone were compared by the use of ribonuclease protection assay (RPA), and/or a semi-quantitative RT-PCR. The high-Na+ diet reduced renal mRNA and protein ClC-2 expression. The renal expression of ClC-2 mRNA decreased in adrenalectomized rats and was restored by plasma aldosterone replacement. In addition, the semi-quantitative RT-PCR in different segments of the nephron showed that these changes were secondary to the modulation of ClC-2 mRNA expression by aldosterone in the cortical and medullary segments of thick ascending limbs of Henle's loop. These results suggest that ClC-2 may be involved with aldosterone-induced Cl- transport in the kidney.