Abstract
Selenium (Se) has been widely reported to possess anti-tumor effects. Angiogenesis is the formation of new blood vessels and is required to supply oxygen, nutrients, and growth factors for tumor growth, progression, and metastasis. To explore whether the anti-tumor effect of Se was associated with angiogenesis in vivo, we studied the effects of sodium selenite (Sel) and methylseleninic acid (MSA) on tumors induced by canine mammary tumor cells (CMT1211) in mice; cyclophosphamide (CTX) served as a positive control. The results showed that the Se content was significantly increased in the Sel and MSA groups. Se significantly inhibited the tumor weights and volumes. Large necrotic areas and scattered and abnormal small necrotic areas were observed in the Se treatment group. Immunofluorescence double staining showed a reduction in the microvessel density (MVD) and increment in the vessel maturation index (VMI) compared with the untreated control group. As expected, the protein and mRNA levels of the angiogenesis factors angiopoietin-2 (Ang-2), platelet-derived growth factor (PDGF), and vascular endothelial growth factor (VEGF) were decreased in the Se-treated tumors by IHC, as shown by western blotting and RT-QPCR. We also found that organic Se MSA provided stronger inhibition of tumor growth compared with inorganic sodium selenite (Sel). Altogether, our results indicated that Se exerted anti-tumor effects in vivo at least partially by inhibiting angiogenic factors.
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This work was financially supported by the National Natural Science Foundation of China (NO. 4004-114060) and the Fundamental Research Funds for the Central Universities (NO. 2662015JC006).
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All experiments were performed in accordance with protocols approved by the Animal Care and Use Committees of both the Chinese Academy of Medical Sciences and Huazhong Agricultural University.
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Wenyu Li and Mengyao Guo contributed equally to this work.
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Li, W., Guo, M., Liu, Y. et al. Selenium Induces an Anti-tumor Effect Via Inhibiting Intratumoral Angiogenesis in a Mouse Model of Transplanted Canine Mammary Tumor Cells. Biol Trace Elem Res 171, 371–379 (2016). https://doi.org/10.1007/s12011-015-0554-6
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DOI: https://doi.org/10.1007/s12011-015-0554-6