イチハラ　アツヒロ   ICHIHARA Atsuhiro   市原　淳弘    所属   医学部 医学科（東京女子医科大学病院）    職種   教授・基幹分野長
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Antidiuretic Action of Collecting Duct (Pro)Renin Receptor Downstream of Vasopressin and PGE2 Receptor EP4.
掲載誌名	正式名：Journal of the American Society of Nephrology : JASN 略　 称：J Am Soc Nephrol ISSNコード：15333450(Electronic)10466673(Linking)
巻・号・頁	27(10),pp.3022-3034
著者・共著者	Wang Fei†, Lu Xiaohan, Peng Kexin, Fang Hui, Zhou Li, Su Jiahui, Nau Adam, Yang Kevin T, ICHIHARA Atsuhiro, Lu Aihua, Zhou Shu-Feng, Yang Tianxin
発行年月	2016/10
概要	UNASSIGNED:Within the kidney, the (pro)renin receptor (PRR) is predominantly expressed in the collecting duct (CD), particularly in intercalated cells, and it is regulated by the PGE2 receptor EP4. Notably, EP4 also controls urinary concentration through regulation of aquaporin 2 (AQP2). Here, we tested the hypothesis that sequential activation of EP4 and PRR determines AQP2 expression in the CD, thus mediating the antidiuretic action of vasopressin (AVP). Water deprivation (WD) elevated renal PRR expression and urinary soluble PRR excretion in rats. Intrarenal infusion of a PRR decoy peptide, PRO20, or an EP4 antagonist partially prevented the decrease in urine volume and the increase in urine osmolality and AQP2 expression induced by 48-hour WD. In primary cultures of rat inner medullary CD cells, AQP2 expression induced by AVP treatment for 24 hours depended on sequential activation of the EP4 receptor and PRR. Additionally, mice lacking PRR in the CD exhibited increased urine volume and decreased urine osmolality under basal conditions and impaired urine concentrating capability accompanied by severe volume loss and a dangerous level of plasma hyperosmolality after WD. Together, these results suggest a previously undescribed linear AVP/PGE2/EP4/PRR pathway in the CD for regulation of AQP2 expression and urine concentrating capability.
DOI	10.1681/ASN.2015050592
文献番号	27000064