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Arsenic trioxide up-regulates Fas expression in human osteosarcoma cells
作者单位:YANG Guo-fu,ZHAO Zhe,WANG Wen-bo(Department of Orthopaedics,the First Affiliated Hospital of Harbin Medical University,Harbin,Heilongjiang 150001,China);LI Xiang-hui(Department of Pharmacy,the Second Affiliated Hospital of Harbin Medical University,Harbin,Heilongjiang 150086,China) 
基金项目:This study was supported by a grant from the Science and Technology Key Projects of Heilongjiang Province (No. GC08C421).
摘    要:Background Osteosarcoma is a common primary malignant tumor of bone with a poor prognosis due to its propensity for metastasis. The prognosis of patients is highly dependent on the presence or absence of lung metastasis and on the effectiveness of treatment against it. It has been reported that low level expression of Fas protein in human osteosarcoma cell is closely associated with lung metastasis. A large number of studies have shown that arsenic trioxide (ATO) can inhibit proliferation and induce apoptosis of many cancer cell lines; however, its effects on human osteosarcoma cells (Saos-2 cell line) remains unknown. The aim of this study was to investigate the effects of ATO on Saos-2 cells and to characterize its mechanism of Fas-expressing. Methods A group of Saos-2 cells was treated with or without 0.5, 1, 2, 4 and 8 pmol/L ATO for three successive days, and the cytotoxicity of ATO was determined by an 3-4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay. Morphological changes in cells were studied by acridine orange/ethidium bromide (AO/EB) double staining. Flow cytometry (FCM) was used to assay cell DNA distribution. Another group of cells was pretreated with 10 nmol/L matrix metalloproteinase 7 (MMP-7) for 3 hours. They were then incubated with or without 2 pmol/L ATO for 24, 48 and 72 hours. Cytotoxicity, Fas protein and mRNA levels were systematically studied using MTT, Western blotting and real-time PCR, respectively. Cell proliferation, cell cycle progression and apoptosis were examined in this study. Results Proliferation of Saos-2 cells was inhibited by ATO in both a dose- and time-dependent manner. The IC50 values at 24, 48 and 72 hours were 9.30, 5.54 and 3.49 pmol/L, respectively. The survival rate of Saos-2 cells in the MMP-7 and ATO co-treated group was significantly higher than the ATO group, but it was lower than the control group. ATO induced G1 phase arrest of the cell cycle and very efficiently stimulated apoptosis in Saos-2 cells, as evidenced by flow cytometric detection of sub-G1 DNA content and AO/EB staining. Western blotting results indicated that Fas (FasL) protein expression in osteosarcoma cultures markedly increases in a time dependent manner after exposure to ATO. Compared with control, treatment with ATO 2 IJmol/L and 4 pmol/L for 48 hours, resulted in increase of Fas gene expression to 28.31% and 56.74%, respectively. Our results indicated that ATO induced-apoptosis of Saos-2 cells may be mediated through the Fas pathway. Conclusions ATO suppressed cell proliferation of Saos-2 cell in a dose- and time-dependent manner and increased Fas protein expression. However, Fas-mediated apoptosis was incompletely interrupted by MMP-7, which suggested that other molecular mechanisms may mediate this process.

关 键 词:三氧化二砷  细胞增殖  FasL  骨肉瘤  Western印迹  时间依赖性  细胞周期阻滞  基质金属蛋白酶

Arsenic trioxide up-regulates Fas expression in human osteosarcoma cells
Authors:YANG Guo-fu  LI Xiang-hui  ZHAO Zhe  WANG Wen-bo
Affiliation:[1]Department of Orthopaedics, the First Affiliated Hospital ofHarbin Medical University, Harbin, Heilongjiang 150001, China [2]Department of Pharmacy, the Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China
Abstract:Background Osteosarcoma is a common primary malignant tumor of bone with a poor prognosis due to its propensity for metastasis. The prognosis of patients is highly dependent on the presence or absence of lung metastasis and on the effectiveness of treatment against it. It has been reported that low level expression of Fas protein in human osteosarcoma cell is closely associated with lung metastasis. A large number of studies have shown that arsenic trioxide (ATO) can inhibit proliferation and induce apoptosis of many cancer cell lines; however, its effects on human osteosarcoma cells (Saos-2 cell line) remains unknown. The aim of this study was to investigate the effects of ATO on Saos-2 cells and to characterize its mechanism of Fas-expressing.Methods A group of Saos-2 cells was treated with or without 0.5,1,2,4 and 8 urnol/L ATO for three successive days, and the cytotoxicity of ATO was determined by an 3-4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay. Morphological changes in cells were studied by acridine orange/ethidium bromide (AO/EB) double staining. Flow cytometry (FCM) was used to assay cell DNA distribution. Another group of cells was pretreated with 10 nmol/L matrix metalloproteinase 7 (MMP-7) for 3 hours. They were then incubated with or without 2 umol/L ATO for 24, 48 and 72 hours. Cytotoxicity, Fas protein and mRNA levels were systematically studied using MTT, Western blotting and real-time PCR, respectively. Cell proliferation, cell cycle progression and apoptosis were examined in this study. Results Proliferation of Saos-2 cells was inhibited by ATO in both a dose- and time-dependent manner. The IC50 values at 24, 48 and 72 hours were 9.30, 5.54 and 3.49 μmol/L, respectively. The survival rate of Saos-2 cells in the MMP-7 and ATO co-treated group was significantly higher than the ATO group, but it was lower than the control group. ATO induced G1 phase arrest of the cell cycle and very efficiently stimulated apoptosis in Saos-2 cells, as evidenced by flow cytometric detection of sub-G1 DNA content and AO/EB staining. Western blotting results indicated that Fas (FasL) protein expression in osteosarcoma cultures markedly increases in a time dependent manner after exposure to ATO. Compared with control, treatment with ATO 2 μmol/L and 4 μmol/L for 48 hours, resulted in increase of Fas gene expression to 28.31% and 56.74%, respectively. Our results indicated that ATO induced-apoptosis of Saos-2 cells may be mediated through the Fas pathway.Conclusions ATO suppressed cell proliferation of Saos-2 cell in a dose- and time-dependent manner and increased Fas protein expression. However, Fas-mediated apoptosis was incompletely interrupted by MMP-7, which suggested that other molecular mechanisms may mediate this process.
Keywords:arsenic trioxide  Saos-2  Fas  Fas ligand  matrix metalloproteinase 7
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