褐藻多糖硫酸酯通过调控HDAC1基因的表达促进胃癌细胞凋亡

Fucoidan sulfate promotes apoptosis of gastric cancer cells by regulating expression of HDAC1

目的:研究褐藻多糖硫酸酯对胃癌细胞凋亡的影响,并探讨其与组蛋白脱乙酰酶1(HDAC1)的作用关系。方法:运用MTT法检测褐藻多糖硫酸酯对胃癌BGC-823细胞活力的影响;将细胞分为si-HDAC1组、si-NC组、褐藻多糖硫酸酯+pcDNA 3.1-HDAC1组和褐藻多糖硫酸酯+pcDNA 3.1组,均以脂质体法转染BGC-823细胞;流式细胞术检测各组细胞的凋亡;Western blot检测各组细胞的HDAC1、Bcl-2和Bax蛋白的表达;RT-qPCR检测各组细胞HDAC1的mRNA表达。结果:与未用褐藻多糖硫酸酯处理的BGC-823细胞相比,褐藻多糖硫酸酯(0.2、0.4、0.6、0.8和1.0 g/L)对BGC-823细胞活力的抑制率均显著上升,选取最适浓度0.6 g/L进行后续实验;与control组相比,褐藻多糖硫酸酯处理的细胞中HDAC1 mRNA和HDAC1、Bcl-2蛋白表达均显著下调,Bax蛋白表达和细胞凋亡率显著上升(P<0.05);敲减HDAC1表达可显著上调BGC-823细胞的凋亡率,且过表达HDAC1可逆转褐藻多糖硫酸酯对BGC-823细胞凋亡的促进作用。结论:褐藻多糖硫酸酯可促进胃癌细胞凋亡,其机制可能与直接抑制HDAC1表达有关。本研究可能为褐藻多糖硫酸酯的临床应用提供支持。

AIM: To study the effects of fucoidan sulfate on the apoptosis of gastric cancer cells, and to explore its relationship with histone deacetylase 1(HDAC1). METHODS: The effects of fucoidan sulfate on the viability of gastric cancer BGC-823 cells were measured by MTT assay. The cells were divided into si-HDAC1 group, si-NC group and fucoidan+pcDNA 3.1-HDAC1 group and fucoidan+pcDNA 3.1 group. The transfection were performed by liposome method. The apoptosis was analyzed by flow cytometry. The protein expression of HDAC1, Bcl-2 and Bax was determined by Western blot. The mRNA expression of HDAC1 was detected by RT-qPCR. RESULTS: Compared with the control cells, the inhibitory rates of the cell viability by fucoidan sulfate(0.2, 0.4, 0.6, 0.8 and 1.0 g/L) were increased signi-ficantly(P<0.05). The appropriate concentration was 0.6 g/L. Compared with control group, the expression of HDAC1 at mRNA and protein levels in fucoidan sulfate group was significantly down-regulated, while the apoptotic rate was significantly increased(P<0.05). Knock-down of HDAC1 expression significantly up-regulated the apoptotic rate, while over-expression of HDAC1 reversed the apoptosis-promoting effect of fucoidan sulfate on the BGC-823 cells. CONCLUSION: Fucoidan sulfate promotes apoptosis of gastric cancer cells. The mechanism may be related to the direct inhibition of HDAC1, which provides support for the clinical application of fucoidan sulfate.