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1988 ; 79
(4
): 413-7
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Wide-spectrum initiation models: possible applications to medium-term multiple
organ bioassays for carcinogenesis modifiers
#MMPMID3133331
Ito N
; Imaida K
; Tsuda H
; Shibata M
; Aoki T
; de Camargo JL
; Fukushima S
Jpn J Cancer Res
1988[Apr]; 79
(4
): 413-7
PMID3133331
show ga
Two wide-spectrum initiation models were investigated in F344 male rats. Model I:
After sequential treatment with diethylnitrosamine (DEN), N-methylnitrosourea
(MNU) and dihydroxy-di-N-propylnitrosamine (DHPN), animals were given
phenobarbital (PB) or N,N-dibutylnitrosamine (DBN) as a test compound for 14
weeks and sacrificed at week 18. Model II: Animals were treated with DHPN,
followed by N-ethyl-N-hydroxyethylnitrosamine (EHEN), and then
3,2'-dimethyl-4-aminobiphenyl (DMAB) as initiators and were subsequently given
3-methylcholanthrene (MCA) or PB as a test compound for 11 weeks. Animals were
sacrificed 16 weeks after the commencement. In both models, assessment of lesion
yield revealed significant enhancement of carcinogenesis by the test compounds in
their respective target organs. Since, in many cases, treatment with PB, DBN and
MCA subsequent to the combined initiation procedures brought about a marked
increase in lesion development, far greater than a simple sum of the yields given
by initiators and test compounds alone, the presently described approach appears
promising for development of medium-term bioassay systems for detection of
environmental carcinogens.