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Aim To study the effect of 8-chloroadenosine (8-CA)on undifferentiatied HL-60 cell line.Methods The IC50 of cancer cell proliferation was determined using a microculture plate reader at 570 nm (MTT) and 540 nm (SRB).Morphology of HL-60 cells was observed under a scanning electron microscope and a transmission electron microscope.The differentiation of HL-60 cells was examined by nitro blue tetrazolium reduction (NBT) and acid phosphatase assay.The cycle of HL-60 cells was analyzed by flow cytometry.Results 8-CA inhibited proliferation of eight human cancer cell lines.The IC50 ranked in the following order: KB (0.05 μmol·L-1) ＜ HL-60 (0.25 μmol·L-1) ＜ Bel-7402 (0.56 μmol·L-1) ＜ MCF-7 (0.65 μmol·L-1) ＜ HCT (0.79 μmol·L-1) ＜ HeLa (0.89 μmol·L-1) ＜ BGC-823 (1.149 μmol·L-1) ＜ PG (2.50 μmol·L-1).The scanning and transmission electron microscopy showed that the microvilli of HL-60 cell surface shortened, and the shape of HL-60 cells nuclei changed to kidney-shaped, horse shoe-shaped and bilob ated after treatment with 8-CA.Meanwhile, 8-CA promoted NBT reduction and increased activity of acid phosphatase in HL-60 cells in a time and concentration-dependent manner.Flow cytometry analysis indicated that 8-CA induced an appreciable increase of the cell population in G1 phase with a marked reduction in S phase.Conclusion 8-CA can induce differentiation of HL-60 cells and block the cells at G1 phase, thus inhibiting proliferation of HL-60 cells. 相似文献
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端粒酶活性调控的研究进展 总被引：4，自引：0，他引：4
端粒酶是一种ＲＮＡ－蛋白质复合物,它通过逆转录过程将富含Ｇ的单链ＤＮＡ重复序列合成至染色体末端。端粒酶的激活和抑制影响到端粒长度的改变,进而对衰老和肿瘤发展有所贡献。建立其活性计控模型,讨论细胞内外因子及其自身组分对它活性的影响,将能够给予关于端粒酶的应用性研究奠定重要基础。 相似文献
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端粒酶活性调控的研究进展 总被引：1，自引：0，他引：1
端粒酶是一种ＲＮＡ－蛋白质复合物,它通过逆转录过程将富含Ｇ的单链ＤＮＡ重复序列合成至染色体末端。端粒酶的激活和抑制影响到端粒长度的改变,进而对衰老和肿瘤发展有所贡献。建立其活性调控模型,讨论细胞内外因子及其自身组分对它活性的影响,将能够给予关于端粒酶的应用性研究奠定重要基础。 相似文献
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