| Title | Disruption of prostaglandin E2 receptor EP4 impairs urinary concentration via decreasing aquaporin 2 in renal collecting ducts |
| Authors | Gao, Min Cao, Rong Du, Shengnan Jia, Xiao Zheng, Senfeng Huang, Shizheng Han, Qifei Liu, Jia Zhang, Xiaoyan Miao, Yifei Kang, Jihong Gustafsson, Jan-Ake Guan, Youfei |
| Affiliation | Peking Univ, Sch Basic Med Sci, Dept Physiol & Pathophysiol, Hlth Sci Ctr, Beijing 100191, Peoples R China. Shenzhen Univ, Hlth Sci Ctr, AstraZeneca Shenzhen Univ Joint Inst Nephrol, Dept Physiol, Shenzhen 518060, Peoples R China. Univ Houston, Ctr Nucl Receptors & Cell Signaling, Houston, TX 77204 USA. Dalian Med Univ, Dept Physiol, Dalian 116044, Liaoning, Peoples R China. |
| Keywords | arachidonic acid cyclooxygenase antidiuretic hormone gene targeting water homeostasis VASOPRESSIN-INDUCED ANTIDIURESIS WATER CHANNEL CAMP PRODUCTION MICE LACKING RAT-KIDNEY EXPRESSION ESCAPE INACTIVATION CELLS GENE |
| Issue Date | 2015 |
| Publisher | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
| Citation | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA.2015,112,(27),8397-8402. |
| 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 adenovirus-mediated 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. |
| URI | http://hdl.handle.net/20.500.11897/418557 |
| ISSN | 0027-8424 |
| DOI | 10.1073/pnas.1509565112 |
| Indexed | SCI(E) PubMed |
| Appears in Collections: | 基础医学院 |
