BACKGROUND: Osteosarcoma is characterized by high neovascularization and a high propensity for metastasis through bloodstream. This study was to examine whether there is evidence for vasculogenic mimicry in osteosarco...BACKGROUND: Osteosarcoma is characterized by high neovascularization and a high propensity for metastasis through bloodstream. This study was to examine whether there is evidence for vasculogenic mimicry in osteosarcoma and to illustrate mechanism of tumor blood vessels formation in osteosarcoma. METHODS: Osteosarcoma cell lines (U-2OS) were tested for their ability to form tubular networks in three-dimensional culture containing type I collagen. The structures of the tubular networks were observed with phase contrast microscope and transmission electron microscope (TEM). Morphometric studies using hematoxylin and eosin (HE) stain and CD31 immunohistochemical stain to show tumor-lined channels in human osteosarcoma were also performed. RESULTS: Observation with light microscope and TEM showed that highly aggressive osteosarcoma cell lines (U-2OS) formed networks containing channels when grown in three-dimensional culture containing type I collagen, in the absence of endothelial cells or fibroblasts. Morphometric observation using HE stain and CD31 immunohistochemical stain showed that tumor cell-lined channels were also detected in vivo in osteosarcoma; by comparison, all vascular areas in the pedicle of osteochondroma or outside osteochondroma were endothelial-lined. CONCLUSION: These observations strongly suggest that aggressive osteosarcoma cells may generate vascular channels that facilitate tumor perfusion independent of tumor angiogenesis and have the ability of vasculogenic mimicry.展开更多
目的探讨分化抑制因子1(inhibitor of differentiation factor 1,Id1)对人骨肉瘤细胞MG63恶性逆转向成骨分化的影响。方法用重组腺病毒调控MG63细胞中Id1过表达后,RT-PCR及Western blot检测验证Id1的表达情况,CCK-8检测细胞增殖能力,划...目的探讨分化抑制因子1(inhibitor of differentiation factor 1,Id1)对人骨肉瘤细胞MG63恶性逆转向成骨分化的影响。方法用重组腺病毒调控MG63细胞中Id1过表达后,RT-PCR及Western blot检测验证Id1的表达情况,CCK-8检测细胞增殖能力,划痕实验检测细胞迁移能力,Transwell实验检测细胞侵袭能力,流式细胞术检测细胞周期,ALP读数法检测成骨分化早期指标ALP的活力。结果 Ad Id1重组腺病毒可以使MG63细胞中的Id1表达量增高,Adsi Id1重组腺病毒可以使MG63细胞中的Id1表达量降低(P<0.05);Id1过表达后,MG63细胞的增殖能力、迁移能力、侵袭能力等恶性生物学行为均增强,G1期细胞比例降低,Id1表达量下调后则逆转MG63细胞的恶性生物学行为,G1期细胞比例增高(P<0.05);Id1表达量下调后,正常成骨分化的早期指标碱性磷酸酶(ALP)表达量增高(P<0.05)。结论抑制Id1基因表达可以促使骨肉瘤的恶性生物学行为逆转并诱导骨肉瘤细胞发生成骨分化。展开更多
Human osteosarcoma MG-63 cells were induced into differentiation by 5 mmol/L hexamethylene bisacetamide （HMBA）. Their nuclear matrix proteins （NMPs） were selectively extracted and subjected to two-dimensional gel ...Human osteosarcoma MG-63 cells were induced into differentiation by 5 mmol/L hexamethylene bisacetamide （HMBA）. Their nuclear matrix proteins （NMPs） were selectively extracted and subjected to two-dimensional gel electrophoresis analysis. The results of protein patterns were analyzed by Melanie software. The spots of differentially expressed NMPs were excised and subjected to in situ digestion with trypsin. The maps of peptide mass fingerprinting were obtained by MALDI-TOF-MS analysis, and were submitted for NCBI database searches by Mascot tool. There were twelve spots changed remarkably during the differentiation induced by HMBA, nine of which were identified. The roles of the regulated proteins during the MG-63 differentiation were analyzed. This study suggests that the induced differentiation of cancer cells is accompanied by the changes of NMPs, and confirms the presence of some specific NMPs related to the cancer cell proliferation and differentiation. The changed NMPs are potential markers for cancer diagnosis or targets for cancer therapy.展开更多
基金ThisstudywassupportedinpartbyagrantfromtheNationalNaturalScienceFoundationofChina (No 3 0 2 713 14 )
文摘BACKGROUND: Osteosarcoma is characterized by high neovascularization and a high propensity for metastasis through bloodstream. This study was to examine whether there is evidence for vasculogenic mimicry in osteosarcoma and to illustrate mechanism of tumor blood vessels formation in osteosarcoma. METHODS: Osteosarcoma cell lines (U-2OS) were tested for their ability to form tubular networks in three-dimensional culture containing type I collagen. The structures of the tubular networks were observed with phase contrast microscope and transmission electron microscope (TEM). Morphometric studies using hematoxylin and eosin (HE) stain and CD31 immunohistochemical stain to show tumor-lined channels in human osteosarcoma were also performed. RESULTS: Observation with light microscope and TEM showed that highly aggressive osteosarcoma cell lines (U-2OS) formed networks containing channels when grown in three-dimensional culture containing type I collagen, in the absence of endothelial cells or fibroblasts. Morphometric observation using HE stain and CD31 immunohistochemical stain showed that tumor cell-lined channels were also detected in vivo in osteosarcoma; by comparison, all vascular areas in the pedicle of osteochondroma or outside osteochondroma were endothelial-lined. CONCLUSION: These observations strongly suggest that aggressive osteosarcoma cells may generate vascular channels that facilitate tumor perfusion independent of tumor angiogenesis and have the ability of vasculogenic mimicry.
文摘目的探讨分化抑制因子1(inhibitor of differentiation factor 1,Id1)对人骨肉瘤细胞MG63恶性逆转向成骨分化的影响。方法用重组腺病毒调控MG63细胞中Id1过表达后,RT-PCR及Western blot检测验证Id1的表达情况,CCK-8检测细胞增殖能力,划痕实验检测细胞迁移能力,Transwell实验检测细胞侵袭能力,流式细胞术检测细胞周期,ALP读数法检测成骨分化早期指标ALP的活力。结果 Ad Id1重组腺病毒可以使MG63细胞中的Id1表达量增高,Adsi Id1重组腺病毒可以使MG63细胞中的Id1表达量降低(P<0.05);Id1过表达后,MG63细胞的增殖能力、迁移能力、侵袭能力等恶性生物学行为均增强,G1期细胞比例降低,Id1表达量下调后则逆转MG63细胞的恶性生物学行为,G1期细胞比例增高(P<0.05);Id1表达量下调后,正常成骨分化的早期指标碱性磷酸酶(ALP)表达量增高(P<0.05)。结论抑制Id1基因表达可以促使骨肉瘤的恶性生物学行为逆转并诱导骨肉瘤细胞发生成骨分化。
文摘Human osteosarcoma MG-63 cells were induced into differentiation by 5 mmol/L hexamethylene bisacetamide （HMBA）. Their nuclear matrix proteins （NMPs） were selectively extracted and subjected to two-dimensional gel electrophoresis analysis. The results of protein patterns were analyzed by Melanie software. The spots of differentially expressed NMPs were excised and subjected to in situ digestion with trypsin. The maps of peptide mass fingerprinting were obtained by MALDI-TOF-MS analysis, and were submitted for NCBI database searches by Mascot tool. There were twelve spots changed remarkably during the differentiation induced by HMBA, nine of which were identified. The roles of the regulated proteins during the MG-63 differentiation were analyzed. This study suggests that the induced differentiation of cancer cells is accompanied by the changes of NMPs, and confirms the presence of some specific NMPs related to the cancer cell proliferation and differentiation. The changed NMPs are potential markers for cancer diagnosis or targets for cancer therapy.
