Inorganic sulfur reduces cell proliferation by inhibiting of ErbB2 and ErbB3 protein and mRNA expression in MDA-MB-231 human breast cancer cells
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Dietary inorganic sulfur is the minor component in our diet, but some studies suggested that inorganic sulfur is maybe effective to treat cancer related illness. Therefore, this study aims to examine the effects of inorganic sulfur on cell proliferation and gene expression in MDA-MB-231human breast cancer cells. MDA-MB-231 cells were cultured the absence or presence of various concentrations (12.5, 25, or 50 μmol/L) of inorganic sulfur. Inorganic sulfur significantly decreased proliferation after 72 h of incubation (P < 0.05). The protein expression of ErbB2 and its active form,pErbB2, were significantly reduced at inorganic sulfur concentrations of 50 μmol/L and greater than 25 μmol/L, respectively (P < 0.05). The mRNA expression of ErbB2 was significantly reduced at an inorganic sulfur concentration of 50 μmol/L (P < 0.05). The protein expression of ErbB3 and its active form, pErbB3, and the mRNA expression of ErbB3 were significantly reduced at inorganic sulfur concentrations greater than 25 μmol/L (P < 0.05). The protein and mRNA expression of Akt were significantly reduced at an inorganic sulfur concentration of 50 μmol/L (P < 0.05), but pAkt was not affected by inorganic sulfur treatment. The protein and mRNA expression of Bax were significantly increased with the addition of inorganic sulfur concentration of 50 μmol/L (P < 0.05). In conclusion, cell proliferation was suppressed by inorganic sulfur treatment through the ErbB-Akt pathway in MDA-MB-231 cells.
Abstract
Dietary inorganic sulfur is the minor component in our diet, but some studies suggested that inorganic sulfur is maybe effective to treat cancer related illness. Therefore, this study aims to examine the effects of inorganic sulfur on cell proliferation and gene expression in MDA-MB-231human breast cancer cells. MDA-MB-231 cells were cultured the absence or presence of various concentrations (12.5, 25, or 50 μmol/L) of inorganic sulfur. Inorganic sulfur significantly decreased proliferation after 72 h of incubation (P < 0.05). The protein expression of ErbB2 and its active form,pErbB2, were significantly reduced at inorganic sulfur concentrations of 50 μmol/L and greater than 25 μmol/L, respectively (P < 0.05). The mRNA expression of ErbB2 was significantly reduced at an inorganic sulfur concentration of 50 μmol/L (P < 0.05). The protein expression of ErbB3 and its active form, pErbB3, and the mRNA expression of ErbB3 were significantly reduced at inorganic sulfur concentrations greater than 25 μmol/L (P < 0.05). The protein and mRNA expression of Akt were significantly reduced at an inorganic sulfur concentration of 50 μmol/L (P < 0.05), but pAkt was not affected by inorganic sulfur treatment. The protein and mRNA expression of Bax were significantly increased with the addition of inorganic sulfur concentration of 50 μmol/L (P < 0.05). In conclusion, cell proliferation was suppressed by inorganic sulfur treatment through the ErbB-Akt pathway in MDA-MB-231 cells.
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