RT Journal Article
SR Electronic
T1 Effect of ASP6432, a Novel Type 1 Lysophosphatidic Acid Receptor Antagonist, on Urethral Function and Prostate Cell Proliferation
JF Journal of Pharmacology and Experimental Therapeutics
JO J Pharmacol Exp Ther
FD American Society for Pharmacology and Experimental Therapeutics
SP 390
OP 396
DO 10.1124/jpet.118.247908
VO 366
IS 2
A1 Kazuyuki Sakamoto
A1 Yukiko Noguchi
A1 Koji Ueshima
A1 Hisashi Yamakuni
A1 Akiyoshi Ohtake
A1 Shuichi Sato
A1 Kenichiro Ishizu
A1 Naomi Hosogai
A1 Eiji Kawaminami
A1 Masahiro Takeda
A1 Noriyuki Masuda
YR 2018
UL http://jpet.aspetjournals.org/content/366/2/390.abstract
AB Current pharmacotherapies for lower urinary tract symptoms associated with benign prostate hyperplasia (LUTS/BPH) are in need of improvement. Lysophosphatidic acid (LPA) is a phospholipid with various biologic functions. However, its exact role in the lower urinary tract and its target receptor subtype have not been fully elucidated. We investigated the role of LPA and the type 1 LPA receptor (LPA1) in urethral/prostatic contractile function and prostate cell proliferation by pharmacologically characterizing ASP6432 (potassium 1-(2-{[3,5-dimethoxy-4-methyl-N-(3-phenylpropyl)benzamido]methyl}-1,3-thiazole-4-carbonyl)-3-ethyl-2,2-dioxo-2λ6-diazathian-1-ide), a novel LPA1 antagonist. ASP6432 exhibited potent and selective antagonistic activity against LPA1 in cells expressing LPA receptor subtypes. In isolated rat tissue strips and anesthetized rats, ASP6432 concentration-/dose-dependently inhibited LPA-induced urethra and prostate contractions. In addition, in anesthetized rats, ASP6432 maximally decreased the urethral perfusion pressure (UPP) in the absence of exogenous LPA stimulation by 43% from baseline, whereas tamsulosin, an α1-adrenoceptor antagonist, reduced UPP by 22%. Further, in human prostate stromal cells, ASP6432 significantly and concentration-dependently suppressed LPA-induced bromodeoxyuridine incorporation. These results demonstrate a pivotal role for LPA and LPA1 in the regulation of urethral tonus and prostate cell proliferation. The potent urethral relaxation and inhibition of prostatic stromal cell growth indicate the potential of ASP6432 as a novel therapeutic agent for LUTS/BPH.