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  • Title: Aldosterone and high-NaCl diet modulate ClC-2 chloride channel gene expression in rat kidney.
    Author: Ornellas DS, Nascimento DS, Christoph DH, Guggino WB, Morales MM.
    Journal: Pflugers Arch; 2002 May; 444(1-2):193-201. PubMed ID: 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.
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