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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Jpn+J+Cancer+Res
1991 ; 82
(12
): 1397-405
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Enhancing potential of 6 different carcinogens on multi-organ tumorigenesis after
initial treatment with N-methyl-N-nitrosourea in rats
#MMPMID1778764
Uwagawa S
; Tsuda H
; Inoue T
; Tagawa Y
; Aoki T
; Kagawa M
; Ogiso T
; Ito N
Jpn J Cancer Res
1991[Dec]; 82
(12
): 1397-405
PMID1778764
show ga
The advantages of applying a whole-body concept to the assessment of carcinogenic
potential of compounds in a two-stage model after initiation by
N-methyl-N-nitrosourea (MNU) were investigated. Male, 6-week-old F344 rats were
injected with MNU (20 mg/kg, i.p.) twice a week for 4 weeks and they then
received 3,2'-dimethyl-4-aminobiphenyl (DMAB) (50 mg/kg, s.c., once a week),
N,N'-dibutylnitrosamine (DBN) (0.05%, in drinking water),
N-bis(2-hydroxypropyl)nitrosamine (DHPN) (0.1%, in drinking water),
diethylstilbestrol (DES) (2.5 ppm, in diet), sodium o-phenylphenate (S.OPP) (2%,
in diet) or captafol (0.15%, in diet) for 20 weeks. All six carcinogens enhanced
the incidences of preneoplastic and neoplastic lesions in their respective target
organs: liver, pancreas, small intestine and urinary bladder with DMAB; liver,
esophagus, forestomach and urinary bladder with DBN; thyroid, lung, liver,
esophagus, forestomach, small intestine and urinary bladder with DHPN; liver and
forestomach with DES; and thyroid, forestomach, kidney and urinary bladder with
S.OPP; liver and forestomach with captafol. The results suggested that prior
treatment with MNU sensitized the tissues to the organotropic carcinogenic
potential of chemicals given thereafter for as short a period as 20 weeks. Thus,
this system could be utilized as a whole-body medium-term bioassay system for the
screening of environmental carcinogens, bridging the gap between in vitro
mutagenicity and long-term carcinogenicity tests.