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1992 ; 83
(8
): 812-20
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Modifying effects of various chemicals on tumor development in a rat
wide-spectrum organ carcinogenesis model
#MMPMID1399818
Uwagawa S
; Tsuda H
; Ozaki K
; Takahashi S
; Yamaguchi S
; Mutai M
; Aoki T
; Ito N
Jpn J Cancer Res
1992[Aug]; 83
(8
): 812-20
PMID1399818
show ga
The efficacy of a wide-spectrum organ carcinogenesis model for detection of
modification potential of exogenous agents was investigated in F344 male rats.
Groups of animals were sequentially injected with
N-bis(2-hydroxypropyl)nitrosamine (1000 mg/kg body weight, i.p., in saline, twice
in week 1), N-ethyl-N-hydroxyethylnitrosamine (1500 mg/kg body weight, i.g., in
distilled water, twice in week 2) and 3,2'-dimethyl-4-aminobiphenyl (75 mg/kg
body weight, s.c., in corn oil, twice in week 3) for wide-spectrum initiation of
target organs and then given one of 10 test chemicals, comprising 6
hepatocarcinogens and 4 non-hepatocarcinogens, for 12 weeks. All 10 chemicals
exerted modifying effects in their respective target organs. Enhancing influence
could be detected in the liver and urinary bladder with 2-acetylaminofluorene,
ethionine, and 3'-methyl-4-dimethylaminoazobenzene; in the liver and thyroid with
4,4'-diaminodiphenylmethane and phenobarbital; in the esophagus and urinary
bladder with N-butyl-N-(4-hydroxybutyl)nitrosamine; in the forestomach and
urinary bladder with butylated hydroxyanisole; in the liver with
7,12-dimethylbenz[a]anthracene and in the liver and lung with
3-methylcholanthrene. Inhibitory effects on development of glutathione
S-transferase placental form-positive liver cell foci were observed with
clofibrate. The results indicate that the present model can be reliably utilized
as a whole body medium-term bioassay system for assessment of environmental
cancer modifiers.