mPGES-1 deletion impairs diuretic response to acute water loading

作者：Soodvilai Sunhapas; Jia Zhanjun; Wang Mong Heng; Dong Zheng; Yang Tianxin^*

来源：American Journal of Physiology - Renal Fluid and Electrolyte Physiology, 2009, 296(5): F1129-F1135.

DOI：10.1152/ajprenal.90478.2008

• water loading
• aquaporin-2
• collecting duct
• diuresis

Soodvilai S, Jia Z, Wang M, Dong Z, Yang T. mPGES-1 deletion impairs diuretic response to acute water loading. Am J Physiol Renal Physiol 296: F1129-F1135, 2009. First published February 18, 2009; doi:10.1152/ajprenal.90478.2008.-PGE2 has an established role in renal water handling. The present study was undertaken to examine the role of microsomal prostaglandin E synthase-1 (mPGES-1) in the diuretic response to acute and chronic water loading. Compared with wild-type (+/+) controls, mPGES-1 -/- mice exhibited impaired ability to excrete an acute, but not chronic water load. In response to acute water loading, urinary PGE2 excretion in the +/+ mice increased at 2 h, in parallel with increased urine flow. In contrast, the -/- mice exhibited a delayed increase in urinary PGE2 excretion, coinciding with the stimulation of renal medullary mRNA expression of cytosolic prostaglandin E synthase but not mPGES-2. At baseline, renal aquaporin-2 (AQP2) expression in mPGES-1 -/- mice was enhanced compared with the +/+ control. In response to acute water loading, renal AQP2 expression in the +/+ mice was significantly reduced, and this reduction was blunted in the -/- mice. Despite striking changes in AQP2 protein expression, renal AQP2 mRNA in both genotypes largely remained unchanged. Overall, these data support an important role of mPGES-1 in provoking the diuretic response to acute water loading.

• 出版日期2009-5