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Dietary Supplementation with Methylseleninic Acid Inhibits Mammary Tumorigenesis and Metastasis in Male MMTV-PyMT Mice.
Biological Trace Element Research 2018 July
Male breast cancer, which makes up approximately 1% of all breast cancers, is an aggressive disease with poor prognosis. We investigated the effects of dietary supplementation with selenium in the form of methylseleninic acid [(MSeA) 2.5 mg selenium/kg] on mammary tumorigenesis in male MMTV-PyMT mice. The mammary tumor latency was 14.6 weeks for the MSeA-fed group and 13.8 weeks for the controls fed the AIN93G diet (p < 0.05). Dietary supplementation with MSeA, versus the control, resulted in a 72% reduction in tumor progression, a 46% reduction in both final volume and weight of mammary tumors, and a 70% reduction in the number of lung metastases. Mammary tumorigenesis in MMTV-PyMT mice, versus non-tumor-bearing wild-type mice, resulted in significant increases in concentrations of plasminogen activator inhibitor-1, urokinase plasminogen activator, monocyte chemotactic protein-1, and vascular endothelial growth factor, but not aromatase and estrogen, in the plasma. Concentrations of all variables mentioned above in both plasma and mammary tumors were lower in MSeA-fed mice. Mammary tumorigenesis reduced plasma levels of adiponectin compared to non-tumor-bearing controls. Adiponectin concentrations in mammary tumors, but not in plasma, were higher in MSeA-fed mice than in controls. In summary, dietary supplementation with selenium in the form of MSeA inhibits mammary tumorigenesis and its pulmonary metastasis in male MMTV-PyMT mice.
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