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  • Title: Effects of danazol on proliferation and viability of 7,12-dimethylbenz(a)anthracene-induced mammary tumours in rats.
    Author: Yoshimura S, Sakamoto S, Kudo H, Suzuki S, Sassa S, Matsubara M, Nagasawa H.
    Journal: Anticancer Res; 1995; 15(1):61-5. PubMed ID: 7733642.
    Abstract:
    The suppressive effects of danazol, an isoxazol derivative of a synthetic steroid 17 alpha-ethinyltestosterone, on cellular viability and DNA synthesis in 7,12-dimethylbenz(a)anthracene induced mammary tumours were investigated in adult female rats by enzyme assays and immunohistochemistry with bromodeoxyuridine (BrdU). Rats treated with danazol for 30 days showed a decrease of plasma levels of luteinizing hormone and estradiol associated with a dysfunction in hypothalamo-hypophysial-gonadal axis, resulting in lower activities in succinate dehydrogenase and thymidine kinase, and a reduction of BrdU-immunoreactive cells in mammary tumours compared with the control, i.e., decreases of viability and pyrimidine nucleotide synthesis in tumour cells in danazol-treated rats.
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