Akira Sugimoto1,#, Kazuhiro Goto2,*,
Atsushi Ishige2, Yasuhiro Komatsu2 and Ken-ichi Miyamoto3
1DepartmentÊof Pharmacology and Pharmaceutics, Division of
Pharmacy and Health Sciences, Graduate School of Natural Science
and Technology, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934,
Japan
2KampoÊand Pharmacognosy Laboratories, Tsumura & Co., 3586 Yoshiwara,
Ami-machi, Ibaraki 300-1192, Japan
3DepartmentÊof Hospitalpharmacy, School of Medicine, Kanazawa
University, 13-1 Takara-machi, Kanazawa 920-0934, Japan
#ÊPresent address: Medical Development
DepartmentÊII, Tsumura & Co., 2 Rokuban-cho, Chiyoda-ku, Tokyo 102-0085,
Japan
*ÊTo whom correspondence should be addressed.
Abstract: To clarify the mechanism of the benefical effect of
Choto-san on cerebral circulation in hypertensive patients, the influence
of Choto-san on cerebral blood flow (CBF) during hemorrhagic hypotension
was evaluated in 10- to 11-month-old spontaneously hypertensive rats. The
lower limit of CBF autoregulation, defined as the mean arterial blood pressure
at which CBF decreased by 10% of the baseline value, was dose-dependently
lowered when Choto-san (0.5-2.0Êg/kg per day, p.o.) was administered
for 14 consecutive days. Uncariae Ramulus et Uncus (150Êmg/kg per day, p.o.),
one of the crude drug components of Choto-san, showed an effect equivalent
to that of Choto-san. The action of Choto-san (2.0Êg/kg per
day, p.o.) or Uncariae
Keywords: Choto-san, Cerebral blood flow autoregulation, Uncariae
Ramulus et Uncus, Nitric oxide,
Spontaneously hypertensive rat
Copyright© The Japanese Pharmacological Society 2000
[Back to TOC]