枸杞多糖调控Shh信号影响骨肉瘤HOS细胞增殖和凋亡

目的:研究枸杞多糖(LBP)调控Sonic Hedgehog(Shh)信号通路对骨肉瘤HOS细胞增殖和凋亡的影响和机制。方法:骨肉瘤HOS细胞分成Control(空白对照)、LBP-I(110 μg/mL枸杞多糖)、LBP-II(220 μg/mL枸杞多糖)、LBP-III(440 μg/mL枸杞多糖)共4组,MTT测定细胞增殖,PI单染法检测细胞周期,Annexin V-FITC/PI双染法测定凋亡,Western blot测定Cleaved Caspase-3、Cleaved PARP、细胞周期依赖性蛋白激酶4(CDK4)、细胞周期蛋白D1(cyclin D1)、Shh、Gli1蛋白表达。Shh信号激活剂和枸杞多糖共同处理骨肉瘤HOS细胞,利用上述方法测定细胞增殖、周期和凋亡变化。结果:与Control组比较,LBP-I、LBP-II、LBP-III组细胞增殖能力依次降低,细胞G0/G1期细胞比例依次升高[(51.2±4.1)% vs. (59.1±3.2)%,(66.8±2.0)%,(72.3±3.2)%,F=72.76,P<0.001],细胞凋亡水平依次升高[(3.9±0.3)% vs. (13.2±1.2)%,(17.6±1.3)%,(24.8±2.1)%,F=364.50,P<0.001],细胞中Cleaved Caspase-3、Cleaved PARP蛋白表达水平依次升高,CDK4、cyclin D1、Shh、Gli1蛋白表达水平依次降低(P<0.05)。与未经Shh信号激活剂处理的细胞比较,经过Shh信号激活剂处理的细胞可以逆转枸杞多糖对骨肉瘤HOS细胞增殖抑制、周期阻滞和凋亡促进作用。结论:枸杞多糖通过抑制Shh信号通路阻滞骨肉瘤HOS细胞周期、抑制细胞增殖并促进细胞凋亡。

Lycium barbarum polysaccharide inhibits the proliferation and promots the apoptosis of osteosarcoma HOS cells by blocking Shh signaling pathway

AIM: To study the effects and mechanism of Lycium barbarum polysaccharide on the proliferation and apoptosis of osteosarcoma HOS cells. METHODS: Osteosarcoma HOS cells were divided into four groups: control group, LBP-I group, LBP-II group and LBP-III group. MTT was used to detect cell proliferation; PI single staining was used to detect cell cycle; Annexin V-FITC/PI double staining was used to detect apoptosis; Western blot was used to detect the expression of Cleaved Caspase-3, Cleaved PARP, cyclin-dependent kinase 4 (CDK4), cyclin D1, Shh and Gli1. Shh signal activator and Lycium barbarum polysaccharide treated osteosarcoma HOS cells together; the changes of cell proliferation, cell cycle and apoptosis were observed. RESULTS: Compared with the control group, the proliferation ability of LBP-I group, LBP-II group and LBP-III group decreased, the proportion of cells in G0/G1 phase increased[(51.2±4.1)% vs. (59.1±3.2)%, (66.8±2.0)%, (72.3±3.2)%, F=72.76, P<0.001], the level of apoptosis increased[(3.9±0.3)% vs. (13.2±1.2)%, (17.6±1.3)%, (24.8±2.1)%, F=364.50, P<0.001], the expression levels of Cleaved Caspase-3, Cleaved PARP protein increased, the expression levels of CDK4, cyclin D1, Shh and Gli1 decreased (P<0.05). Compared with cells not treated with Shh signal activator, the cells treated with Shh signal activator could reverse the effect of Lycium barbarum polysaccharide on the proliferation, cycle arrest and apoptosis of osteosarcoma HOS cells. CONCLUSION: Lycium barbarum polysaccharides blocked the cell cycle of osteosarcoma HOS cells, inhibited cell proliferation and promoted cell apoptosis by inhibiting Shh signaling pathway.