ID 110638
Author
Momen, Mohammed Abdul Second Department of Surgery, University Hospital, The University of Tokushima School of Medicine
Monden, Yasumasa Second Department of Surgery, University Hospital, The University of Tokushima School of Medicine Tokushima University Educator and Researcher Directory
Houchi, Hitoshi Division of Pharmacy, University Hospital, The University of Tokushima School of Medicine
Umemoto, Atsushi Second Department of Surgery, University Hospital, The University of Tokushima School of Medicine
Keywords
ursodeoxycholic acid
aberrant crypt foci
colon cancer
bile acid
intracellular Ca2+
Content Type
Journal Article
Description
The studies were conducted to examine the precise nature of the suppressive effect of ursodeoxycholic acid (UDCA) on colonic aberrant crypt foci (ACF) formation. Fischer 344 rats were treated with a single dose of azoxymethane (AOM) (20 mg/kg, s.c.) and fed basal diet (MF) supplemented with UDCA (0.4%) during an initiation or a post-initiation stage. ACF were enumerated at the 2nd, 5th and 8th weeks after AOM administration (15-18 rats/group).The number of ACF in the UDCA treated group was decreased significantly in the initiation and post-initiation stages at the 2nd (Plt0.01, Plt0.0001) and 8th weeks (Plt0.001, Plt0.0001),respectively, compared with untreated controls. In the time-course experiments, the effect of continuous feeding of UDCA (0.4%) on ACF formation was evaluated. ACF number was decreased significantly (Plt0.005) until the 16thweek.UDCAshowed a significant dose-dependent suppression of ACF number from a range of 0.1-0.4%UDCA.To approach the subcellular mechanisms of the effect of bile acids, the intracellular free Ca2+ concentration ([Ca2+]i) of bile acid-treated rat colonic cancer cells (ACL-15) was examined. DCA and CDCA, which are promotive on ACF formation, induced a rapid increase in [Ca2+]i, while UDCA and CA, which are suppressive or non-effective on ACF formation, did not. These findings suggest that the promotive effect of bile acids may involve intracellular Ca2+ signaling.
Journal Title
The journal of medical investigation : JMI
ISSN
13431420
NCID
AA11166929
Volume
49
Issue
1-2
Start Page
67
End Page
73
Sort Key
67
Published Date
2002
FullText File
language
eng
TextVersion
Publisher
departments
Medical Sciences