Carcinogenicity of nitropyrenes in the newborn female rat.

Abstract:

:The carcinogenicities of 1-nitropyrene (1-NP), 4-nitropyrene (4-NP), 1,3-dinitropyrene (1,3-DNP), 1,6-dinitropyrene (1,6-DNP), 1,8-dinitropyrene (1,8-DNP), 3-hydroxy-1-nitropyrene (3-OH-1-NP) and a mixture of 6- and 8-hydroxy-1-nitropyrene (6/8-OH-1-NP) were investigated in newborn female rats. Newborn female CD rats were treated s.c. eight times at weekly intervals with a total dose of 6.3 mumol 1-NP,1,3-DNP,1,6-DNP or 1,8-DNP; control animals received only dimethylsulfoxide (DMSO). The experiment was terminated at 67 weeks. With the exception of 1,6-DNP- and 1,8-DNP-treated animals, which had average survival periods of 149 and 164 days respectively, the animals administered the other compounds did not show decreased survival. Malignant fibrous histiocytomas were observed in 12%, 100% and 100% of the rats treated with 1,3-, 1,6- and 1,8-DNP respectively. Leukemia was found in 20% and 22% of the animals treated with 1,6- and 1,8-DNP respectively. No control rats developed these tumors. Additionally, mammary tumors were induced in rats treated with 1-NP. Newborn female CD rats were similarly treated with 1-NP, 4-NP, 3-OH-1-NP, 6/8-OH-1-NP or DMSO and newborn female F344 rats were treated with 1-NP or DMSO. The experiment was terminated at 86 weeks, 1-NP and 4-NP produced mammary adenocarcinoma in CD rats. Although 1-NP did not produce mammary adenocarcinoma in F344 rats, it induced leukemia. 4-NP also induced malignant fibrous histiocytomas in CD rats. This study demonstrates that 4-NP is more carcinogenic than 1-NP and that CD rats are more susceptible than F344 rats to mammary carcinogenesis by 1-NP. Additionally, 1,6- and 1,8-DNP are more potent than 1-NP in inducing malignant fibrous histiocytomas and leukemia.

journal_name

Carcinogenesis

journal_title

Carcinogenesis

authors

Imaida K,Lee MS,Land SJ,Wang CY,King CM

doi

10.1093/carcin/16.12.3027

subject

Has Abstract

pub_date

1995-12-01 00:00:00

pages

3027-30

issue

12

eissn

0143-3334

issn

1460-2180

journal_volume

16

pub_type

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