Disruption of prostaglandin E2 receptor EP4 impairs urinary concentration via decreasing aquaporin 2 in renal collecting ducts

Min Gao, Rong Cao, Shengnan Du, Xiao Jia, Senfeng Zheng, Shizheng Huang, Qifei Han, Jia Liu, Xiaoyan Zhang, Yifei Miao, Jihong Kang, Jan Åke Gustafsson, Youfei Guan

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

The antidiuretic hormone arginine vasopressin is a systemic effector in urinary concentration. However, increasing evidence suggests that other locally produced factors may also play an important role in the regulation of water reabsorption in renal collecting ducts. Recently, prostaglandin E2 (PGE2) receptor EP4 has emerged as a potential therapeutic target for the treatment of nephrogenic diabetes insipidus, but the underlying mechanism is unknown. To evaluate the role of EP4 in regulating water homeostasis, mice with renal tubule-specific knockout of EP4 (Ksp-EP4-/-) and collecting duct-specific knockout of EP4 (AQP2-EP4-/-) were generated using the Cre-loxP recombination system. Urine concentrating defect was observed in both Ksp-EP4-/- And AQP2-EP4-/- mice. Decreased aquaporin 2 (AQP2) abundance and apical membrane targeting in renal collecting ducts were evident in Ksp-EP4-/- mice. In vitro studies demonstrated that AQP2 mRNA and protein levels were significantly up-regulated in mouse primary inner medullary collecting duct (IMCD) cells after pharmacological activation or adenovirusmediated overexpression of EP4 in a cAMP/cAMP-response element binding protein-dependent manner. In addition, EP4 activation or overexpression also increased AQP2 membrane accumulation in a mouse IMCD cell line (IMCD3) stably transfected with the AQP2 gene, mainly through the cAMP/protein kinase A and extracellular signal-regulated kinase pathways. In summary, the EP4 receptor in renal collecting ducts plays an important role in regulating urinary concentration under physiological conditions. The ability of EP4 to promote AQP2 membrane targeting and increase AQP2 abundance makes it a potential therapeutic target for the treatment of clinical disorders including acquired and congenital diabetes insipidus.

Original languageEnglish (US)
Pages (from-to)8397-8402
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume112
Issue number27
DOIs
StatePublished - Jul 7 2015

Keywords

  • Antidiuretic hormone
  • Arachidonic acid
  • Cyclooxygenase
  • Gene targeting
  • Water homeostasis

ASJC Scopus subject areas

  • General

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