The effects of flavoxate hydrochloride on voltage-dependent L-type Ca 2+ currents in human urinary bladder

Toshihisa Tomoda, Manami Aishima, Naruaki Takano, Toshiaki Nakano, Narihito Seki, Yoshikazu Yonemitsu, Katsuo Sueishi, Seiji Naito, Yushi Ito, Noriyoshi Teramoto

研究成果: ジャーナルへの寄稿記事

13 引用 (Scopus)


The effects of flavoxate hydrochloride (Bladderon®, piperidinoethyl-3-methylflavone-8-carboxylate; hereafter referred as flavoxate) on voltage-dependent nifedipine-sensitive inward Ba 2+ currents in human detrusor myocytes were investigated using a conventional whole-cell patch-clamp. Tension measurement was also performed to study the effects of flavoxate on K +-induced contraction in human urinary bladder. Flavoxate caused a concentration-dependent reduction of the K +-induced contraction of human urinary bladder. In human detrusor myocytes, flavoxate inhibited the peak amplitude of voltage-dependent nifedipine-sensitive inward Ba 2+ currents in a voltage- and concentration-dependent manner (K i = 10 μM), and shifted the steady-state inactivation curve of Ba 2+ currents to the left at a holding potential of -90mV. Immunohistochemical studies indicated the presence of the α 1c subunit protein, which is a constituent of human L-type Ca 2+ channels (Ca v1-2), in the bundles of human detrusor smooth muscle. These results suggest that flavoxate caused muscle relaxation through the inhibition of L-type Ca 2+ channels in human detrusor.

ジャーナルBritish Journal of Pharmacology
出版物ステータス出版済み - 12 1 2005


All Science Journal Classification (ASJC) codes

  • Pharmacology