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- W2120072015 abstract "Cyclooxygenase-2 activity is required for the development of lithium-induced polyuria. However, the involvement of a specific, terminal prostaglandin (PG) isomerase has not been evaluated. The present study was undertaken to assess lithium-induced polyuria in mice deficient in microsomal prostaglandin E synthase-1 (mPGES-1). A 2-wk administration of LiCl (4 mmol·kg −1 ·day −1 ip) in mPGES-1 +/+ mice led to a marked polyuria with hyposmotic urine. This was associated with elevated renal mPGES-1 protein expression and increased urine PGE 2 excretion. In contrast, mPGES-1 −/− mice were largely resistant to lithium-induced polyuria and a urine concentrating defect, accompanied by nearly complete blockade of high urine PGE 2 and cAMP output. Immunoblotting, immunohistochemistry, and quantitative (q) RT-PCR consistently detected a significant decrease in aquaporin-2 (AQP2) protein expression in both the renal cortex and medulla of lithium-treated +/+ mice. This decrease was significantly attenuated in the −/− mice. qRT-PCR detected similar patterns of changes in AQP2 mRNA in the medulla but not in the cortex. Similarly, the total protein abundance of the Na-K-2Cl cotransporter (NKCC2) in the medulla but not in the cortex of the +/+ mice was significantly reduced by lithium treatment. In contrast, the dowregulation of renal medullary NKCC2 expression was significantly attenuated in the −/− mice. We conclude that mPGES-1-derived PGE 2 mediates lithium-induced polyuria likely via inhibition of AQP2 and NKCC2 expression." @default.
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- W2120072015 date "2009-12-01" @default.
- W2120072015 modified "2023-10-16" @default.
- W2120072015 title "Mice lacking mPGES-1 are resistant to lithium-induced polyuria" @default.
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- W2120072015 doi "https://doi.org/10.1152/ajprenal.00117.2009" @default.
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