Soyasaponin Ag inhibits triple-negative breast cancer progression via targeting the DUSP6/MAPK signaling
Abstract
Introduction. Soyasaponins are triterpenoid glycosides discovered in soybean and have anti-cancer properties. Soyasaponin A was reported to repress estrogen-insensitive breast cancer cell proliferation. This study intends to explore the role of one isomer of soyasaponin A, i.e. soyasaponin Ag (Ssa Ag), in triple-negative breast cancer (TNBC) development.
Material and methods. Bioinformatic databases were used to predict DUSP6 expression in breast cancer (BC) as well as the correlation between the expression of DUSP6 (or MAPK1, MAPK14) with the prognosis of patients with BC. The expression of DUSP6/MAPK signaling-related genes (DUSP6, MAPK1, and MAPK14) in TNBC cell lines was assessed via Western blot analysis and RT-qPCR. Levels of cell apoptosis proteins (Bax and Bcl-2) in TNBC cells were assessed via Western blot analysis. CCK-8 assay, colony formation assay, and flow cytometry analysis were conducted for the measurement of TNBC cell growth and apoptosis. In vivo xenograft assay was employed for investigating the biological influence of Ssa Ag on tumor growth.
Results. The poor prognosis of BC patients was linked to the aberrant expression of DUSP6/MAPK pathway
genes. Low expression of DUSP6 or high expression of MAPK1 (or MAPK14) was correlated to poor prognosis. DUSP6 was downregulated while MAPK1 and MAPK14 were upregulated in TNBC cells versus normal cells. Ssa Ag upregulated DUSP6 expression while downregulated MAPK1 and MAPK14 expression, inhibiting the MAPK signaling pathway. Additionally, Ssa Ag promoted in vitro TNBC cell apoptosis and restrained cell growth, and repressed in vivo tumor growth.
Conclusions. Ssa Ag inhibited TNBC progression via upregulating DUSP6 and inactivating the MAPK signaling pathway.
Keywords: soyasaponin AgDUSP6/MAPK signalingtriple-negative breast cancerproliferationapoptosis
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