OBJECTIVE The human leukemia K562-n cell line displays much higher tumorigenic actively in nude mice compared with its parental K562 cell line. The molecular mechanism of the differences in tumorigenicity between K562...OBJECTIVE The human leukemia K562-n cell line displays much higher tumorigenic actively in nude mice compared with its parental K562 cell line. The molecular mechanism of the differences in tumorigenicity between K562-n and K562 in nude mice was examined.METHODS The differences in gene expression between K562 and K562-n cells were analyzed by using cDNA microarrays.RESULTS Among the 12,800 genes examined, there was a significant difference in expression of 139 genes between K562-n and K562 cells.Eighty-five of these genes have been registered in the GeneBank and 54 are unknown. The genes accessible from the GeneBank include:l) oncogenes and tumor-supressor genes; 2) genes related to transcription regulation, the cell cycle and apoptosis; 3) genes related to the cytoskeleton and cytokinetics; 4) genes related to metabolism and transport; 5) genes related to immune function. There were also some differently expressed genes with mixed functions.CONCLUSION There are many genes differentially expressed between K562-n and K562 cells .The high tumorigenicity of the human leukemia K562-n cell line in nude mice might be related to its specific geneexpression profile.展开更多
Apoptosis as a mechanism of deleting cells from tissues plays an important role in physiological and varieties of pathological situations, especially cancer conditions. In order to search for tumor cells apoptosis ind...Apoptosis as a mechanism of deleting cells from tissues plays an important role in physiological and varieties of pathological situations, especially cancer conditions. In order to search for tumor cells apoptosis inducers, the inhibition effects on K562 cells of N-phosphoryl dipeptide methyl esters were studied by MTT assays, and (DIPP-L-Leu)2- L-Lys-OCH3 was the compound which had the best activity. From the studies of the typical apoptotic morphologic changes, DNA agarose gel electrophoresis, and flow cytometry analysis, it could be concluded that (DIPP-L-Leu)2- L-Lys-OCH3 could induce apoptosis of K562 cells in a dose-dependent manner, and the IC50 was 22.66 mol/L according to MTT assays.展开更多
文摘OBJECTIVE The human leukemia K562-n cell line displays much higher tumorigenic actively in nude mice compared with its parental K562 cell line. The molecular mechanism of the differences in tumorigenicity between K562-n and K562 in nude mice was examined.METHODS The differences in gene expression between K562 and K562-n cells were analyzed by using cDNA microarrays.RESULTS Among the 12,800 genes examined, there was a significant difference in expression of 139 genes between K562-n and K562 cells.Eighty-five of these genes have been registered in the GeneBank and 54 are unknown. The genes accessible from the GeneBank include:l) oncogenes and tumor-supressor genes; 2) genes related to transcription regulation, the cell cycle and apoptosis; 3) genes related to the cytoskeleton and cytokinetics; 4) genes related to metabolism and transport; 5) genes related to immune function. There were also some differently expressed genes with mixed functions.CONCLUSION There are many genes differentially expressed between K562-n and K562 cells .The high tumorigenicity of the human leukemia K562-n cell line in nude mice might be related to its specific geneexpression profile.
基金supported by the National Natural Science Foundation of China(Grant No.20132020).
文摘Apoptosis as a mechanism of deleting cells from tissues plays an important role in physiological and varieties of pathological situations, especially cancer conditions. In order to search for tumor cells apoptosis inducers, the inhibition effects on K562 cells of N-phosphoryl dipeptide methyl esters were studied by MTT assays, and (DIPP-L-Leu)2- L-Lys-OCH3 was the compound which had the best activity. From the studies of the typical apoptotic morphologic changes, DNA agarose gel electrophoresis, and flow cytometry analysis, it could be concluded that (DIPP-L-Leu)2- L-Lys-OCH3 could induce apoptosis of K562 cells in a dose-dependent manner, and the IC50 was 22.66 mol/L according to MTT assays.
