Interaction between Radiation and Drug Damage in Mammalian Cells. VI. Radiation and Doxorubicin Age-Response Function of Doxorubicin-Sensitive and -Resistant Chinese Hamster Cells

1992 ◽  
Vol 132 (1) ◽  
pp. 105 ◽  
Author(s):  
Yin Zhang ◽  
Kevin M. Sweet ◽  
Marguerite A. Sognier ◽  
James A. Belli
Keyword(s):  
Response Function ◽  
Mammalian Cells ◽  
Chinese Hamster ◽  
Chinese Hamster Cells

scholarly journals 8-AZAGUANINE RESISTANCE IN MAMMALIAN CELLS I. HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE

Genetics ◽  
1972 ◽  
Vol 72 (2) ◽  
pp. 239-252 ◽  
Author(s):  
F D Gillin ◽  
D J Roufa ◽  
A L Beaudet ◽  
C T Caskey
Keyword(s):  
Nucleic Acid ◽  
Mammalian Cells ◽  
Chinese Hamster ◽  
Acid Synthesis ◽  
Ethyl Methanesulfonate ◽  
Nucleic Acid Synthesis ◽  
Wild Type ◽  
Chinese Hamster Cells ◽  
Hypoxanthine Guanine Phosphoribosyltransferase

ABSTRACT Chinese hamster cells were treated with ethyl methanesulfonate or N-methyl-N'-nitro-N-nitrosoguanidine, and mutants resistant to 8-azaguanine were selected and characterized. Hypoxanthine-guanine phosphoribosyltransferase activity of sixteen mutants is extremely negative, making them suitable for reversion to HGPRTase+. Ten of the extremely negative mutants revert at a frequency higher than 10-7 suggesting their point mutational character. The remaining mutants have demonstrable HGPRTase activity and are not useful for reversion analysis. Five of these mutants have < 2% HGPRTase and are presumably also HGPRTase point mutants. The remaining 14 mutants utilize exogenous hypoxanthine for nucleic acid synthesis poorly, and possess 20-150% of wild-type HGPRTase activity in in vitro. Their mechanism of 8-azaguanine resistance is not yet defined.

Correction of Genetic Defects in Mammalian Cells by the Input of Small Amounts of Foreign Genetic Material

1973 ◽  
Vol 13 (3) ◽  
pp. 841-861
Author(s):  
YVONNE L. BOYD ◽  
H. HARRIS
Keyword(s):  
Thymidine Kinase ◽  
Mammalian Cells ◽  
Hybrid Cell ◽  
Genetic Material ◽  
Chinese Hamster ◽  
Heat Sensitivity ◽  
Chinese Hamster Cells ◽  
Inosinic Acid ◽  
Mouse Cells

Chinese hamster cells lacking inosinic acid pyrophosphorylase and mouse cells lacking thymidine kinase were fused with chick erythrocytes. The resultant heterokaryons were cultivated in a selective medium in which possession of these enzymes was essential for cell survival and growth. Clones of cells able to grow in this medium were isolated and studied. A detailed karyological analysis of these clones failed to reveal any chick chromosomes; nor could any chick-specific antigens be detected on the surface of the cells. Nonetheless, clones arising from the fusion of chick erythrocytes with Chinese hamster cells were shown to possess an inosinic acid pyrophosphorylase which had the electrophoretic characteristics of chick inosinic acid pyrophosphorylase. However, the clones arising from the fusion of the chick erythrocytes with the mouse cells had a thymidine kinase with the electrophoretic mobility and heat sensitivity of murine, not chick, thymidine kinase. Both types of hybrid cell have now been cultivated in vitro for 18 months without the loss of thymidine kinase or inosinic acid pyrophosphorylase activity.

scholarly journals STUDIES OF DNA-INDUCED HERITABLE ALTERATION OF MAMMALIAN CELLS

1970 ◽  
Vol 132 (6) ◽  
pp. 1071-1089 ◽  
Author(s):  
Ellen Borenfreund ◽  
Yuji Honda ◽  
Mildred Steinglass ◽  
Aaron Bendich
Keyword(s):  
Mammalian Cells ◽  
Chinese Hamster ◽  
Ascites Tumor ◽  
Intercellular Interaction ◽  
Oncogenic Potential ◽  
Chinese Hamster Cells ◽  
Direct Microscopic Examination ◽  
Ehrlich Ascites ◽  
Specific Antigens

An intercellular interaction between mouse Ehrlich ascites tumor and non-malignant Chinese hamster cells occurred when these were co-cultured. That the intercellular processes which formed had emanated from the EA cells was revealed by immunofluoroscopy using anti-EA antiserum, and by direct microscopic examination. A passage of DNA from the EA to the CH cells was also observed. On long-term co-culture, new cell forms arose which were isolated, cloned, and propagated. They showed a CH karyotype and had acquired oncogenic potential and the ability to synthesize murine-specific antigens. These same heritable properties were also acquired by CH cells following their exposure to DNA isolated from EA cells.

Mutagenesis in cultured mammalian cells I. Spontaneous gene mutations in human and Chinese hamster cells

1972 ◽  
Vol 15 (2) ◽  
pp. 203-214 ◽  
Author(s):  
N.I. Shapiro ◽  
A.E. Khalizev ◽  
Eugeny V. Luss ◽  
Marina I. Marshak ◽  
Olga N. Petrova ◽  
...  
Keyword(s):  
Mammalian Cells ◽  
Chinese Hamster ◽  
Gene Mutations ◽  
Chinese Hamster Cells

scholarly journals TEMPORAL ORDER IN MAMMALIAN CELLS

1969 ◽  
Vol 43 (2) ◽  
pp. 207-219 ◽  
Author(s):  
Robert R. Klevecz
Keyword(s):  
Enzyme Activity ◽  
Mammalian Cells ◽  
Temporal Order ◽  
Actinomycin D ◽  
Chinese Hamster ◽  
Enzyme Synthesis ◽  
S Phase ◽  
Selection System ◽  
Enzyme Protein ◽  
Chinese Hamster Cells

Chinese hamster cells were synchronized by the Colcemid-selection system. In cells with a division cycle time of 11.5–12 hr, the activity of the enzyme lactate dehydrogenase (LDH) underwent marked oscillations with a 3.5-hr period. Precipitation of labeled LDH enzyme with specific antibody indicated that the enzyme activity changes were the result of intermittent enzyme synthesis and relatively constant degradation. Inhibition of normal DNA replication with 4 mM of thymidine, while reducing the amount of new enzyme synthesized, did not prevent oscillations from occurring. Similarly, actinomycin D (AcD) added at the time of synchronization allowed some new enzyme synthesis to proceed in an oscillatory manner. LDH synthesis went on at nearly normal rates when AcD was added in the middle of S phase. However, addition of cycloheximide to cultures at any time in the cycle caused an immediate drop in levels of activity and in enzyme protein. The half-life of LDH, calculated either from loss of enzyme activity or precipitable radioactivity in cycloheximide-treated cultures, was between 2 and 2.5 hr.

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