Toshihiko Hayakawa

Randomized clinical trial: rikkunshito in the treatment of functional dyspepsia—a multicenter, double-blind, randomized, placebo-controlled study

Rikkunshito, a standardized Japanese herbal medicine, is thought to accelerate gastric emptying and relieve dyspepsia, although no large‐scale, randomized, placebo‐controlled trials of rikkunshito have been conducted. This study aimed to determine the efficacy and safety of rikkunshito for treating functional dyspepsia (FD).

Interactions among gastric somatostatin, interleukin-8 and mucosal inflammation in Helicobacter pylori-positive peptic ulcer patients.

Background. To investigate whether Helicobacter pylori infection, but not drugs, affects gastric somatostatin, interleukin‐8 (IL‐8), histological inflammation through eradication therapy, and interactions among these parameters.

Association of baseline plasma des-acyl ghrelin level with the response to rikkunshito in patients with functional dyspepsia

We recently conducted a randomized placebo‐controlled trial on the efficacy and safety of rikkunshito, a standardized Japanese herbal medicine, for the treatment of functional dyspepsia (FD). The present post‐hoc study aimed to evaluate the differences in clinical characteristics between responders and non‐responders among FD patients who received rikkunshito for 8 weeks.

Enhanced somatostatin secretion into the gastric juice with recovery of basal acid output after Helicobacter pylori eradication in gastric ulcers.

Background and Aim: Antral somatostatin interacts with gastric acid secretion. We aimed to investigate the effect of eradication on gastric acid, somatostatin secretion and mucosal histology in gastric ulcer patients with Helicobacter pylori (H. pylori) infection.

In vitro effects of endothelin-1 on somatostatin and thyrotropin-releasing hormone release from the rat stomach

The effects of endothelin (ET) 1 on the release of somatostatin (SS) and thyrotropin-releasing hormone (TRH) from the rat stomach were studied in vitro. The rat stomach was incubated in medium 199 with 1.0 mg/ml of bacitracin (pH 7.4) for 20 min. The amounts of SS and TRH released into the medium were measured by individual radioimmunoassays. With the addition of ET-1, the release of SS from the rat stomach was inhibited significantly in a dose-related manner, whereas TRH released from the stomach was enhanced significantly. These effects of ET-1 on SS or TRH release were blocked by BQ-485, a blocker of ETA receptor. These findings suggest that ET-1 inhibits SS and stimulates TRH release from the rat stomach in vitro, and that these effects are mediate via ETA receptor.

Sa1331 Efficacy and Safety of Rikkunshito, a Japanese Herbal Medicine, on the Treatment of Functional Dyspepsia: A Multi-Center, Double-Blind, Randomized, Placebo-Controlled Study

Efficacy and Safety of Rikkunshito, a Japanese Herbal Medicine, on the Treatment of Functional Dyspepsia: A Multi-Center, Double-Blind, Randomized, Placebo-Controlled Study Hidekazu Suzuki, Juntaro Matsuzaki, Yasushi Fukushima, Fumio Suzaki, Kunio Kasugai, Toshihiro Nishizawa, Yuji Naito, Toshihiko Hayakawa, Takeshi Kamiya, Takashi Ando, Hideo Yoshida, Yoshifumi Tokura, Hiroshi Nagata, Masao Kobayakawa, Mikiji Mori, Kimihiko Kato, Hiroshi Hosoda, Toru Takebayashi, Soichiro Miura, Naomi Uemura, Takashi Joh, Toshifumi Hibi, Jan F. Tack