The effects of growth factors and calcium concentrations present in different culture media on induction of terminal differentiation were investigated for four different epidermoid carcinoma cell lines, Hela, KB, A431...The effects of growth factors and calcium concentrations present in different culture media on induction of terminal differentiation were investigated for four different epidermoid carcinoma cell lines, Hela, KB, A431, and SCC-25, and their responses determined relative to those elicited by normal human keratinocytes subjected to these culture conditions. Differentiation status was determined cyto-chemically by a validated keratin protein staining method, and by autoradiographic analyses. Growth and differentiation promoting factors that influenced the direction of integrated control of growth and differentiation in normal human keratinocytes were found to be effective for some cell lines but not others. The factors examined were 1) high density arrest in serum-free and serum-containing media, 2) media shifts from high density culture in serum-containing media to low density growth factor-depleted or supplemented serum-free medium, and 3) the concentration of calcium in the media. The extent and degree of differentiation achieved varied among different cell lines depend on the presence or absence of serum, EGF and insulin protein growth factors. Certain growth media appear to sponsor keratin protein, cyto-chemically-detected differentiation, and evidence of quantal mitotic division in low density HeLa cell and SCC25 cell cultures. Epidermoid carcinoma cell lines retain limited capacity to commit to early stages of cell differentiation.展开更多
目的观察正常和不同病变程度的口腔黏膜上皮细胞对α干扰素(IFN-α)敏感性的差异,为IFN-α的抗肿瘤应用和机制的研究提供基础。方法分别培养正常口腔黏膜上皮细胞株(NOK)、口腔黏膜异常增生上皮细胞株(DOK)、口腔表皮样癌细胞株(KB),取...目的观察正常和不同病变程度的口腔黏膜上皮细胞对α干扰素(IFN-α)敏感性的差异,为IFN-α的抗肿瘤应用和机制的研究提供基础。方法分别培养正常口腔黏膜上皮细胞株(NOK)、口腔黏膜异常增生上皮细胞株(DOK)、口腔表皮样癌细胞株(KB),取传至第3代对数生长期细胞接种于细胞培养板,对照组每孔加入2 m L含10%胎牛血清的完全培养液,实验组设IFN-α浓度100、500、1 000 U/m L 3个浓度组,实验组每孔分别加入含相应浓度IFN-α的完全培养液,常规培养24 h后检测细胞增殖能力、细胞凋亡和细胞周期变化情况。结果不同浓度的IFN-α分别作用于3种细胞,对NOK细胞株的增殖能力无影响,而DOK、KB细胞株各实验组与对照组相比增殖能力明显减慢,差异均有显著统计学意义(均P<0.01)。浓度500 U/m L IFN-α对NOK细胞株的凋亡无影响,但有促进DOK、KB细胞株凋亡的作用。浓度500 U/m L IFN-α对NOK细胞株周期无影响,DOK细胞株G0/G1期细胞比例显著减少,而G2/M期细胞比例显著增加,KB细胞株G2/M期细胞比例显著增加。结论正常上皮细胞对IFN-α不敏感,而DOK、KB细胞株对IFN-α敏感;IFN-α有抑制DOK、KB细胞株的增殖能力、促其凋亡的作用,且细胞周期阻滞于G2/M期。展开更多
The differential distribution between cancer cells and normal adult tissues makes survivin a very attractive cancer drug target. We have previously reported a series of novel selective survivin inhibitors with the mos...The differential distribution between cancer cells and normal adult tissues makes survivin a very attractive cancer drug target. We have previously reported a series of novel selective survivin inhibitors with the most potent compound MX 106 reaching nanomolar activity in several cancer cell lines. Further optimization of the MX 106 scaffold leads to the discovery of more potent and more selective survivin inhibitors. Various structural modifications were synthesized and their anticancer activities were evaluated to determine the structure activity relationships for this MX 106 scaffold. In vitro anti-proliferative assays using two human melanoma cell lines showed that several new analogs have improved potency compared to MX 106. Very interestingly, these new analogs generally showed significantly higher potency against P-glycoprotein overexpressed cells compared with the corresponding parental cells, suggesting that these compounds may strongly sensitize tumors that have high expressions of the Pglycoprotein drug efflux pumps. Western blotting analysis confirmed that the new MX 106 analogs maintained their mechanism of actions by selectively suppressing survivin expression level among major inhibitors of apoptotic proteins and induced strong apoptosis in melanoma tumor cells.展开更多
文摘The effects of growth factors and calcium concentrations present in different culture media on induction of terminal differentiation were investigated for four different epidermoid carcinoma cell lines, Hela, KB, A431, and SCC-25, and their responses determined relative to those elicited by normal human keratinocytes subjected to these culture conditions. Differentiation status was determined cyto-chemically by a validated keratin protein staining method, and by autoradiographic analyses. Growth and differentiation promoting factors that influenced the direction of integrated control of growth and differentiation in normal human keratinocytes were found to be effective for some cell lines but not others. The factors examined were 1) high density arrest in serum-free and serum-containing media, 2) media shifts from high density culture in serum-containing media to low density growth factor-depleted or supplemented serum-free medium, and 3) the concentration of calcium in the media. The extent and degree of differentiation achieved varied among different cell lines depend on the presence or absence of serum, EGF and insulin protein growth factors. Certain growth media appear to sponsor keratin protein, cyto-chemically-detected differentiation, and evidence of quantal mitotic division in low density HeLa cell and SCC25 cell cultures. Epidermoid carcinoma cell lines retain limited capacity to commit to early stages of cell differentiation.
文摘目的观察正常和不同病变程度的口腔黏膜上皮细胞对α干扰素(IFN-α)敏感性的差异,为IFN-α的抗肿瘤应用和机制的研究提供基础。方法分别培养正常口腔黏膜上皮细胞株(NOK)、口腔黏膜异常增生上皮细胞株(DOK)、口腔表皮样癌细胞株(KB),取传至第3代对数生长期细胞接种于细胞培养板,对照组每孔加入2 m L含10%胎牛血清的完全培养液,实验组设IFN-α浓度100、500、1 000 U/m L 3个浓度组,实验组每孔分别加入含相应浓度IFN-α的完全培养液,常规培养24 h后检测细胞增殖能力、细胞凋亡和细胞周期变化情况。结果不同浓度的IFN-α分别作用于3种细胞,对NOK细胞株的增殖能力无影响,而DOK、KB细胞株各实验组与对照组相比增殖能力明显减慢,差异均有显著统计学意义(均P<0.01)。浓度500 U/m L IFN-α对NOK细胞株的凋亡无影响,但有促进DOK、KB细胞株凋亡的作用。浓度500 U/m L IFN-α对NOK细胞株周期无影响,DOK细胞株G0/G1期细胞比例显著减少,而G2/M期细胞比例显著增加,KB细胞株G2/M期细胞比例显著增加。结论正常上皮细胞对IFN-α不敏感,而DOK、KB细胞株对IFN-α敏感;IFN-α有抑制DOK、KB细胞株的增殖能力、促其凋亡的作用,且细胞周期阻滞于G2/M期。
文摘The differential distribution between cancer cells and normal adult tissues makes survivin a very attractive cancer drug target. We have previously reported a series of novel selective survivin inhibitors with the most potent compound MX 106 reaching nanomolar activity in several cancer cell lines. Further optimization of the MX 106 scaffold leads to the discovery of more potent and more selective survivin inhibitors. Various structural modifications were synthesized and their anticancer activities were evaluated to determine the structure activity relationships for this MX 106 scaffold. In vitro anti-proliferative assays using two human melanoma cell lines showed that several new analogs have improved potency compared to MX 106. Very interestingly, these new analogs generally showed significantly higher potency against P-glycoprotein overexpressed cells compared with the corresponding parental cells, suggesting that these compounds may strongly sensitize tumors that have high expressions of the Pglycoprotein drug efflux pumps. Western blotting analysis confirmed that the new MX 106 analogs maintained their mechanism of actions by selectively suppressing survivin expression level among major inhibitors of apoptotic proteins and induced strong apoptosis in melanoma tumor cells.
