Journal Article

Effects of 1,4-phenylenebis(methylene)selenocyanate and selenomethionine on 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone-induced tumorigenesis in A/J mouse lung.

B Prokopczyk, S Amin, D H Desai, C Kurtzke, P Upadhyaya and K El-Bayoumy

in Carcinogenesis

Volume 18, issue 9, pages 1855-1857
Published in print January 1997 | ISSN: 0143-3334
Published online January 1997 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/18.9.1855
Effects of 1,4-phenylenebis(methylene)selenocyanate and selenomethionine on 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone-induced tumorigenesis in A/J mouse lung.

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We reported earlier that continuous feeding of 1,4-phenylenebis(methylene)selenocyanate (p-XSC) inhibited lung tumor induction by the tobacco-specific nitrosamine, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) in the A/J mouse (El-Bayoumy et al., Carcinogenesis, 14, 1111-1113, 1993). The present investigation was designed to determine whether p-XSC inhibits pulmonary neoplasia induced by NNK in female A/J mice during the initiation phase of carcinogenesis or during the post-initiation phase. The naturally occurring selenomethionine was also included in this study. Doses higher than 4 p.p.m. of selenomethionine can induce toxic effects, therefore, dietary supplementation of this compound was selected at a dose level of 3.75 p.p.m. However, we were able to give p-XSC at selenium levels of 7.5 and 15 p.p.m., as mice can tolerate such doses in this form without any adverse effects. NNK was given by a single i.p. injection at dose of 10 micromol in 0.1 ml of saline. Selenomethionine did not show chemopreventive activity when administered in either phase of tumorigenesis. In contrast, p-XSC significantly reduced lung tumor multiplicity regardless of whether it was given during the initiation phase of tumorigenesis (P = 0.0009 at both levels of selenium) or post-initiation (P = 0.0009 at 15 p.p.m. and P = 0.036 for 7.5 p.p.m.). This is the first report describing that the synthetic organoselenium compound, p-XSC, can effectively block and suppress chemically (NNK)-induced lung tumor development in mice.

Journal Article.  0 words. 

Subjects: Clinical Cytogenetics and Molecular Genetics

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