Renoprotective effects of the novel prostaglandin EP4 receptor-selective antagonist ASP7657 in 5/6 nephrectomized chronic kidney disease rats

  • Kazuhiko MizukamiEmail author
  • Hiroyuki Yoshida
  • Eisuke Nozawa
  • Koichi Wada
  • Tohru Ugawa
Original Article


Prostaglandins (PGs) are important lipid mediators of numerous physiologic and pathophysiologic processes in the kidney. PGE2, the most abundant renal PG, plays a major role in renal physiology, including renin release and glomerular hemodynamics. We investigated the renoprotective properties of the novel PGE2 EP4 receptor-selective antagonist ASP7657 in 5/6 nephrectomized rats, a chronic kidney disease (CKD) model. Eight weeks of repeated administration of ASP7657 (0.001–0.1 mg/kg) dose-dependently and significantly reduced urinary protein excretion and attenuated the development of glomerulosclerosis and tubulointerstitial damage, including fibrosis and inflammatory cell infiltration, without affecting blood pressure. Additionally, ASP7657 tended to have beneficial effects on renal function, as indicated by the decrease in plasma creatinine and blood urea nitrogen levels and attenuation of the decline in creatinine clearance (Ccr). The angiotensin II receptor blocker losartan (10 mg/kg) also showed these renoprotective effects while significantly reducing blood pressure. ASP7657 dose-dependently and significantly reduced the EP4 receptor agonist-induced increase in plasma renin activity, as assessed by angiotensin I release in normal rats. Additionally, ASP7657 attenuated hyperfiltration assessed by Ccr without changing the renal blood flow or blood pressure in diabetic rats. These results suggest that ASP7657 suppresses the progression of chronic renal failure by modulating renin release and improving renal hemodynamics, and may therefore be a promising therapeutic option for inhibiting the progression of CKD.


Prostaglandin EP4 receptor antagonist Hyperfiltration Renin release Chronic kidney disease 



The authors thank Drs. Akiyoshi Shimaya, Yuichi Tomura, and Atsuo Tahara (Astellas Pharma Inc.) for their valuable comments and continuing encouragement.

Author contributions

KM, HY, EN, KW, and TU conceived and designed the research. KM, HY, and TU performed experiments and analyzed the data. EN contributed to the synthesis of ASP7657. KM and KW wrote the manuscript. All authors read and approved the manuscript.

Compliance with ethical standards

Animal studies were approved by the Institutional Animal Care and Use Committee of Astellas Pharma Inc., Tsukuba Research Center, which is accredited by the Association for Assessment and Accreditation of Laboratory Animal Care (AAALAC) International.

Conflict of interest

The authors have no conflict of interest other than being employees of Astellas Pharma Inc.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Drug Discovery ResearchAstellas Pharma Inc.IbarakiJapan

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