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Renal expression and urinary excretion of Na + /dicarboxylate cotransporter 1 (NaDC1) in obstructive nephropathy: a candidate biomarker for this pathology.
Pflügers Archiv : European Journal of Physiology 2018 December
Obstructive nephropathy is characterized by alterations in renal function that depends on the degree and type of obstruction. To increase the knowledge about the physiopathological mechanisms involved in the renal damage associated with bilateral ureteral obstruction (BUO), we studied the renal expression and function (as urinary citrate excretion) of sodium-dependent dicarboxylate cotransporter (NaDC1) in rats. In addition, we evaluated the urinary excretion of NaDC1 as a candidate biomarker for this pathology. Male Wistar rats underwent bilateral ureteral obstruction for 1 (BUO1), 2 (BUO2), 5 (BUO5), and 24 (BUO24) h or sham operation. After 24 h of ureteral releasing, traditional parameters of renal function and citrate levels were determined, and NaDC1 levels were evaluated in total renal homogenates, apical plasma membranes, and urine by electrophoresis and Western blotting. Traditional parameters of renal function were only modified in BUO5 and BUO24. The renal expression of NaDC1 was decreased in BUO5 and BUO24, with a concomitant increase in urinary excretion of citrate. Moreover, the urinary excretion of NaDC1 increased after short times of ureteral obstruction (BUO1 and BUO2) and was positively correlated with the time elapsed after obstruction. The results obtained from the renal expression of NaDC1 could explain an adaptive mechanism to prevent the formation of kidney stones by increasing the levels of citrate, a calcium chelator. The urinary excretion of NaDC1 could be postulated as an early biomarker of obstructive nephropathy that also gives information about the duration of the obstruction.
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