A benzimidazole fungicide, benomyl, and its metabolite, carbendazim, induce aromatase activity in a human ovarian granulose-like tumor cell line (KGN)

Hidetaka Morinaga, Toshihiko Yanase, Masatoshi Nomura, Taijiro Okabe, Kiminobu Goto, Nobuhiro Harada, Hajime Nawata

Research output: Contribution to journalArticle

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Abstract

Endocrine disruptor chemicals are known to cause a range of abnormalities in sexual differentiation and reproduction. One mechanism underlying such effects may be via alteration of aromatase activity, which is responsible for estrogen production. A good screening system for identifying endocrine disruptors has long been desired. We have recently established a human ovarian granulosa-like tumor cell line, KGN, which possesses a relatively high level of aromatase expression and is considered a useful mammalian model for investigating the in vitro effects of various chemicals on aromatase activity. In this study we screened 55 different candidate chemicals for endocrine disruptors by assaying aromatase activity. Only benomyl, known as both a benzimidazole fungicide and a microtubule-interfering agent, was found to induce aromatase activity in association with increased levels of aromatase mRNA in KGN cells. The effect of benomyl was presumed to be mediated by its metabolite carbendazim, because it produced an effect equivalent to that of benomyl. The mechanism underlying the benomyl-induced increase in aromatase activity appears independent of the cAMP-protein kinase A pathway. Treatment with taxol, another class of microtubule-interfering agents, also caused induction of aromatase in KGN cells. Both benomyl and taxol changed KGN cell morphology, including the development of cell roundness and a disorganized network of microtubules. These results indicate that benomyl is a potential endocrine disruptor that provides a novel estrogenicity and operates through a microtubule-interfering mechanism.

Original languageEnglish
Pages (from-to)1860-1869
Number of pages10
JournalEndocrinology
Volume145
Issue number4
DOIs
Publication statusPublished - Apr 1 2004

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Benomyl
Aromatase
Tumor Cell Line
Endocrine Disruptors
Microtubules
Paclitaxel
Sex Differentiation
granulose
benzimidazole
carbendazim
Cyclic AMP-Dependent Protein Kinases
Reproduction
Estrogens
Messenger RNA

All Science Journal Classification (ASJC) codes

  • Endocrinology

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A benzimidazole fungicide, benomyl, and its metabolite, carbendazim, induce aromatase activity in a human ovarian granulose-like tumor cell line (KGN). / Morinaga, Hidetaka; Yanase, Toshihiko; Nomura, Masatoshi; Okabe, Taijiro; Goto, Kiminobu; Harada, Nobuhiro; Nawata, Hajime.

In: Endocrinology, Vol. 145, No. 4, 01.04.2004, p. 1860-1869.

Research output: Contribution to journalArticle

Morinaga, Hidetaka ; Yanase, Toshihiko ; Nomura, Masatoshi ; Okabe, Taijiro ; Goto, Kiminobu ; Harada, Nobuhiro ; Nawata, Hajime. / A benzimidazole fungicide, benomyl, and its metabolite, carbendazim, induce aromatase activity in a human ovarian granulose-like tumor cell line (KGN). In: Endocrinology. 2004 ; Vol. 145, No. 4. pp. 1860-1869.
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