American journal of physiology. Renal physiology
-
Am. J. Physiol. Renal Physiol. · Jan 2003
Altered expression of major renal Na transporters in rats with unilateral ureteral obstruction.
It has been demonstrated previously that ureteral obstruction was associated with downregulation of renal AQP2 expression and an impaired urinary concentrating capacity (Li C, Wang W, Kwon TH, Isikay L, Wen JG, Marples D, Djurhuus JC, Stockwell A, Knepper MA, Nielsen S, and Frøkiaer J. Am J Physiol Renal Physiol 281: F163-F171, 2001). In the present study, changes in the expression of major renal Na transporters were examined in a rat model with 24 h of unilateral ureteral obstruction (UUO) to clarify the molecular mechanisms of the marked natriuresis seen after release of UUO. ⋯ In nonobstructed contralateral kidneys, a significant reduction in the abundance of inner medullary Na-K-ATPase and cortical NaPi-2 was found. This may contribute to the compensatory increase in urinary production (23 +/- 2 vs. 13 +/- 1 microl x min(-1). kg(-1)) and increased fractional excretion of urinary Na (0.62 +/- 0.03 vs. 0.44 +/- 0.03%, P < 0.05). In conclusion, downregulation of major renal Na transporters in rats with UUO may contribute to the impairment in urinary concentrating capacity and natriuresis after release of obstruction, and reduced levels of Na-K-ATPase and NaPi-2 in the contralateral nonobstructed kidney may contribute to the compensatory increase in water and Na excretion from that kidney during UUO and after release of obstruction.