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Alteration of cellular oncogene expression in L1210 cells by a nitrosourea analog of thymidine.
- Source :
-
Cancer communications [Cancer Commun] 1991 Apr; Vol. 3 (4), pp. 119-26. - Publication Year :
- 1991
-
Abstract
- 3'[3-(2-Chloroethyl)-3'nitrosoureido]-3'-deoxythymidine (3'-CTNU), a chloroethylnitrosourea analog of thymidine, is a potent antineoplastic agent against murine leukemia L1210. In this study, we have examined the effects of 3'-CTNU on cellular oncogene (proto-oncogene) expression. We found that the expression of the c-myb proto-oncogene was dramatically enhanced in a concentration- and time-dependent manner by 3'-CTNU in murine leukemia L1210 cells, whereas the expression of the c-myc proto-oncogene was suppressed. The enhancement of c-myb gene expression was found to be cell type-specific and to involve an increase of the c-myb transcription rate rather than an alteration of c-myb gene structure or increased stability of c-myb mRNA. Further analysis demonstrated that the altered c-myb gene expression was largely due to the presence of 3'-amino-3'-deoxythymidine, a decomposition product of 3'-CNTU. The expression of five other proto-oncogenes was unaffected by 3'-CTNU treatment. Our study showed that an antineoplastic agent can increase or decrease the expression of proto-oncogenes.
- Subjects :
- Actins biosynthesis
Animals
Blotting, Northern
Blotting, Southern
DNA analysis
Dose-Response Relationship, Drug
Genes, myc drug effects
Leukemia L1210 metabolism
Mice
Proto-Oncogene Proteins biosynthesis
Proto-Oncogene Proteins c-myb
RNA analysis
Time Factors
Transcription, Genetic drug effects
Tumor Cells, Cultured
Antineoplastic Agents pharmacology
Dideoxynucleosides pharmacology
Gene Expression Regulation, Neoplastic drug effects
Leukemia L1210 drug therapy
Proto-Oncogenes drug effects
Subjects
Details
- Language :
- English
- ISSN :
- 0955-3541
- Volume :
- 3
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Cancer communications
- Publication Type :
- Academic Journal
- Accession number :
- 1709036
- Full Text :
- https://doi.org/10.3727/095535491820873452