Biomaterial Database

Evidence that thioguanine-resistant lymphocytes detected by autoradiography are mutant cells. 1983

J L Dempsey, and A A Morley

The autoradiographic detection of thioguanine-resistant (TGR) cells has been proposed as a method for measurement of in vivo mutation frequency. This proposition was tested by combining the autoradiographic technique with the technique of long-term lymphocyte culture. Irradiation of lymphocytes on day 0 following by culture showed a dose-related increase the frequency of TGR cells with an expression time of approx. 7 days. There was a suggestion that mis-sense mutations as well as non-sense mutations and deletions were increased. Incubation with aminopterin for 10 days prevented the increase in TGR cells after irradiation and probably decreased the frequency of TGR cells prior to irradiation. The results suggest that many or most of the TGR cells measured autoradiographically are mutant cells. However, the variability observed with the method imposes limitations on its use and suggests that it will be of more value in studying populations rather than individuals.

UI	MeSH Term	Description	Entries
D008214	Lymphocytes	White blood cells formed in the body's lymphoid tissue. The nucleus is round or ovoid with coarse, irregularly clumped chromatin while the cytoplasm is typically pale blue with azurophilic (if any) granules. Most lymphocytes can be classified as either T or B (with subpopulations of each), or NATURAL KILLER CELLS.	Lymphoid Cells,Cell, Lymphoid,Cells, Lymphoid,Lymphocyte,Lymphoid Cell
D009152	Mutagenicity Tests	Tests of chemical substances and physical agents for mutagenic potential. They include microbial, insect, mammalian cell, and whole animal tests.	Genetic Toxicity Tests,Genotoxicity Tests,Mutagen Screening,Tests, Genetic Toxicity,Toxicity Tests, Genetic,Genetic Toxicity Test,Genotoxicity Test,Mutagen Screenings,Mutagenicity Test,Screening, Mutagen,Screenings, Mutagen,Test, Genotoxicity,Tests, Genotoxicity,Toxicity Test, Genetic
D009154	Mutation	Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.	Mutations
D004351	Drug Resistance	Diminished or failed response of an organism, disease or tissue to the intended effectiveness of a chemical or drug. It should be differentiated from DRUG TOLERANCE which is the progressive diminution of the susceptibility of a human or animal to the effects of a drug, as a result of continued administration.	Resistance, Drug
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000630	Aminopterin	A folic acid derivative used as a rodenticide that has been shown to be teratogenic.	Aminopterin Sodium,Aminopterin, Disodium Salt,Disodium Salt Aminopterin,Sodium, Aminopterin
D001345	Autoradiography	The making of a radiograph of an object or tissue by recording on a photographic plate the radiation emitted by radioactive material within the object. (Dorland, 27th ed)	Radioautography
D013866	Thioguanine	An antineoplastic compound which also has antimetabolite action. The drug is used in the therapy of acute leukemia.	6-Thioguanine,2-Amino-6-Purinethiol,Lanvis,Tabloid,Thioguanin-GSK,Thioguanine Anhydrous,Thioguanine Hemihydrate,Thioguanine Monosodium Salt,Thioguanine Tabloid,Tioguanina Wellcome,Tioguanine,2 Amino 6 Purinethiol,6 Thioguanine,Anhydrous, Thioguanine,Thioguanin GSK,ThioguaninGSK
D014965	X-Rays	Penetrating electromagnetic radiation emitted when the inner orbital electrons of an atom are excited and release radiant energy. X-ray wavelengths range from 1 pm to 10 nm. Hard X-rays are the higher energy, shorter wavelength X-rays. Soft x-rays or Grenz rays are less energetic and longer in wavelength. The short wavelength end of the X-ray spectrum overlaps the GAMMA RAYS wavelength range. The distinction between gamma rays and X-rays is based on their radiation source.	Grenz Ray,Grenz Rays,Roentgen Ray,Roentgen Rays,X Ray,X-Ray,Xray,Radiation, X,X-Radiation,Xrays,Ray, Grenz,Ray, Roentgen,Ray, X,Rays, Grenz,Rays, Roentgen,Rays, X,X Radiation,X Rays,X-Radiations