RESUMO
To study the effect of serum containing Xihuang pill on the proliferation of human breast cancer cell lines MDA-MB-435 and MCF-7 and the gene and protein expressions of Bcl-2, Bax, TP53, in order to explore the effect and mechanism of Xihuang pill in resisting breast cancer. The serum of the rats was prepared by the method of MTT assay. The expressions of Bcl-2 and Bax were detected by RT-PCR. The serum levels of Bcl-2 and Bax and the mRNA expression of TP53 were detected by immunofluorescence. The rats with serum containing Xihuang pill could inhibit the proliferation of MDA-MB-435 cells and MCF-7 cells (<0.05). The serum containing Xihuang pill increased TP53 and Bax in MDA-MB-435 cells (<0.05), and the ratio of Bcl-2/Bax was decreased (<0.05). Meanwhile, the serum containing Xihuang pill could up-regulate the mRNA expression of Bax in MCF-7 cells and decrease the expression of Bcl (<0.05), but there was no significant difference between the expression of TP53mRNA and Bax protein expressions after the treatment of MCF-7 cells with Xihuang pill serum. Serum containing Xihuang pill can induce the apoptosis of human breast cancer cells, and the mechanism of estrogen receptor-negative breast cancer cell apoptosis may be induced by up-regulating the mRNA expression of TP53, which can induce the expression of Bax and promote the metastasis of Bax to mitochondria, and ultimately play the role of inducing apoptosis.