Biomaterial Database

Ehrlich ascites tumor (EAT) chalone effects on nascent DNA synthesis and DNA polymerase alpha and beta. 1976

G S Nakai

EAT chalone effects on nascent DNA synthesis and DNA polymerase were examined. Concentration related inhibition of 3H-thymidine (3H-TdR) incorporation into EAT cell DNA was noted over a chalone range of 50-200 mug/ml. RNA synthesis was not affected, but protein synthesis decreased an average of 82% during 3 hr. Nascent DNA pulse-labeled for 2 min was normally incorporated into bulk DNA in the presence of chalone, but crude alpha- and beta-polymerase activities were inhibited. Crude DNA polymerase for C3H mouse kidney and spleen was also partially inhibited by EAT chalone, suggesting non-specific inhibition of DNA polymerase. Preincubation studies of chalone with crude EAT DNA polymerase or 'gapped' DNA primer had no effect on chalone activity. Chalone may control mitotic activity by inhibiting alpha- and beta-polymerase activity, thereby decreasing nascent DNA synthesis. Nascent DNA is incorporated normally into bulk DNA in the presence of chalone, indicating the DNA ligase is not inhibited.

UI	MeSH Term	Description	Entries
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
D002460	Cell Line	Established cell cultures that have the potential to propagate indefinitely.	Cell Lines,Line, Cell,Lines, Cell
D004256	DNA Polymerase I	A DNA-dependent DNA polymerase characterized in prokaryotes and may be present in higher organisms. It has both 3'-5' and 5'-3' exonuclease activity, but cannot use native double-stranded DNA as template-primer. It is not inhibited by sulfhydryl reagents and is active in both DNA synthesis and repair.	DNA Polymerase alpha,DNA-Dependent DNA Polymerase I,Klenow Fragment,DNA Pol I,DNA Dependent DNA Polymerase I,Polymerase alpha, DNA
D004257	DNA Polymerase II	A DNA-dependent DNA polymerase characterized in E. coli and other lower organisms. It may be present in higher organisms and has an intrinsic molecular activity only 5% of that of DNA Polymerase I. This polymerase has 3'-5' exonuclease activity, is effective only on duplex DNA with gaps or single-strand ends of less than 100 nucleotides as template, and is inhibited by sulfhydryl reagents.	DNA Polymerase epsilon,DNA-Dependent DNA Polymerase II,DNA Pol II,DNA Dependent DNA Polymerase II
D004259	DNA-Directed DNA Polymerase	DNA-dependent DNA polymerases found in bacteria, animal and plant cells. During the replication process, these enzymes catalyze the addition of deoxyribonucleotide residues to the end of a DNA strand in the presence of DNA as template-primer. They also possess exonuclease activity and therefore function in DNA repair.	DNA Polymerase,DNA Polymerases,DNA-Dependent DNA Polymerases,DNA Polymerase N3,DNA Dependent DNA Polymerases,DNA Directed DNA Polymerase,DNA Polymerase, DNA-Directed,DNA Polymerases, DNA-Dependent,Polymerase N3, DNA,Polymerase, DNA,Polymerase, DNA-Directed DNA,Polymerases, DNA,Polymerases, DNA-Dependent DNA
D004273	DNA, Neoplasm	DNA present in neoplastic tissue.	Neoplasm 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
D012334	RNA, Neoplasm	RNA present in neoplastic tissue.	Neoplasm RNA