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Mithramycin inhibits epithelial-to-mesenchymal transition and invasion by downregulating SP1 and SNAI1 in salivary adenoid cystic carcinoma.
Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine 2017 June
Mithramycin exhibits certain anticancer effects in glioma, metastatic cerebral carcinoma, malignant lymphoma, chorionic carcinoma and breast cancer. However, its effects on salivary adenoid cystic carcinoma remain unclear. Here, we report that mithramycin significantly inhibited epithelial-to-mesenchymal transition and invasion in human salivary adenoid cystic carcinoma cell lines. The underlying mechanism for this activity was further demonstrated to involve decreasing the expression of the transcription factors specificity protein 1 and SNAI1. Specificity protein 1 is a pro-tumourigenic transcription factor that is overexpressed in SACC-LM and SACC-83 cells, and its expression is inhibited by mithramycin. Moreover, chromatin immunoprecipitation assays showed that specificity protein 1 induced SNAI1 transcription through direct binding to the SNAI1 promoter. In summary, this study uncovered the mechanism through which mithramycin inhibits epithelial-to-mesenchymal transition and invasion in salivary adenoid cystic carcinoma cell lines, namely, via downregulating specificity protein 1 and SNAI1 expression, which suggests mithramycin may be a promising therapeutic option for salivary adenoid cystic carcinoma.
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