Carcinogenesis, Vol 19, 281-285, Copyright © 1998 by Oxford University Press
IR Rowland, CJ Rumney, JT Coutts and LC Lievense
The effect of Bifidobacterium longum (4 x 10(8) viable cells/g diet) and a
derivative of inulin ('Raftiline HP'; 5% w/w in diet) on colonic aberrant
crypt foci (ACF) induced by the colon carcinogen azoxymethane (AOM) has
been studied. The concentration of ammonia, a putative tumour promoter
produced by bacterial degradation of protein and urea, and the activities
of certain bacterial enzymes thought to play a role in colon
carcinogenesis, beta-glucuronidase and beta-glucosidase were also assayed.
Consumption of either B. longum or inulin was associated with a decrease
(26 and 41%, respectively) in AOM-induced small ACF (i.e. those comprising
1-3 aberrant crypts per focus). Combined administration of the
bifidobacterium and inulin resulted in more potent inhibition of ACF than
administration of the two separately, achieving 80% inhibition of small
ACF. Furthermore, the combined administration significantly decreased the
incidence (by 59%) of large ACF (>4 aberrant crypts per focus), which
are considered to be predictive of eventual tumour incidence. Since the
dietary treatments were started 1 week after the carcinogen dose, the
results suggest that B. longum and inulin may be affecting the early
promotion phase of the carcinogenic process. Consumption of diets
containing B. longum, inulin or both were also associated with decreases in
beta-glucuronidase activity and ammonia concentration in the caecal
contents. Both these factors have been associated with carcinogenesis of
the colon in experimental animal models. In rats given inulin-containing
diets (with or without B. longum) an increase in caecal wt and
beta-glucosidase activity and a decrease in caecal pH were observed. The
results suggest that consumption of B. longum or inulin was associated with
potentially beneficial changes in caecal physiology and bacterial metabolic
activity in relation to tumour risk and in the incidence of putative
preneoplastic lesions in the colon. The results also indicated that
combined treatment with the two agents was more effective in reducing
colonic lesions.
ARTICLES
Effect of Bifidobacterium longum and inulin on gut bacterial metabolism and carcinogen-induced aberrant crypt foci in rats
Northern Ireland Centre for Diet and Health, School of Biomedical Sciences, University of Ulster, Coleraine, UK. I.Rowland@ulst.ac.uk
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