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Effect of Ehrlich ascites cell chalone on nascent DNA synthesis in isolated nuclei. 1980

G S Nakai, and H Gergely

Ehrlich Ascites Tumor (EAT) chalone has been shown to inhibit nascent DNA synthesis by inhibiting DNA polymerase alpha and beta (Nakai, 1976), but one of the problems in studying eurkaryotic DNA replication has been the relative impermeability of the cell membrane to precursors and macromolecules; hence, to circumvent this restriction without sacrificing the integrity of the replication process, a broken cell system utilizing nuclei in aqueous media was investigated. Isolated nuclei appear to continue the process of DNA replication that was proceeding in vivo before their isolation and under optimal concitions are able to initiate new synthesis (Fraser & Huberman, 1977). The effects of partially purified EAT chalone on nascent DNA could be studied directly in this nuclear system, which excluded effects of the cell membrane, nucleotide pools and other cytosol elements. A concentration-related inhibition of [3H]thymidine triphosphate ([3H]dTTP) incorporation was noted over a chalone range of 50-200 micrograms/ml. It appears that chalone can inhibit DNA polymerase alpha directly within the nucleus without an intermediate step such as a cell membrane receptor.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D002286 Carcinoma, Ehrlich Tumor A transplantable, poorly differentiated malignant tumor which appeared originally as a spontaneous breast carcinoma in a mouse. It grows in both solid and ascitic forms. Ehrlich Ascites Tumor,Ascites Tumor, Ehrlich,Ehrlich Tumor Carcinoma,Tumor, Ehrlich Ascites
D002458 Cell Fractionation Techniques to partition various components of the cell into SUBCELLULAR FRACTIONS. Cell Fractionations,Fractionation, Cell,Fractionations, Cell
D002467 Cell Nucleus Within a eukaryotic cell, a membrane-limited body which contains chromosomes and one or more nucleoli (CELL NUCLEOLUS). The nuclear membrane consists of a double unit-type membrane which is perforated by a number of pores; the outermost membrane is continuous with the ENDOPLASMIC RETICULUM. A cell may contain more than one nucleus. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed) Cell Nuclei,Nuclei, Cell,Nucleus, Cell
D004247 DNA A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine). DNA, Double-Stranded,Deoxyribonucleic Acid,ds-DNA,DNA, Double Stranded,Double-Stranded DNA,ds DNA
D004305 Dose-Response Relationship, Drug The relationship between the dose of an administered drug and the response of the organism to the drug. Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D006131 Growth Inhibitors Endogenous or exogenous substances which inhibit the normal growth of human and animal cells or micro-organisms, as distinguished from those affecting plant growth ( Cell Growth Inhibitor,Cell Growth Inhibitors,Growth Inhibitor,Growth Inhibitor, Cell,Growth Inhibitors, Cell,Inhibitor, Cell Growth,Inhibitor, Growth,Inhibitors, Cell Growth,Inhibitors, Growth
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013942 Thymine Nucleotides Phosphate esters of THYMIDINE in N-glycosidic linkage with ribose or deoxyribose, as occurs in nucleic acids. (From Dorland, 28th ed, p1154) Thymidine Phosphates,Nucleotides, Thymine,Phosphates, Thymidine

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