title: Assessment of antimetabolite cytotoxicity: a comparison of clonogenic assays and tritiated deoxyuridine incorporation.
abstract: A comparison has been made between the cloning capacity and changes in tritiated deoxyuridine (6-[3H]-UdR) incorporation of L1210 (murine leukaemia) and PMC-22 (human melanoma) cells treated with methotrexate (MTX), 5-fluorouracil (5-FU) and cytosine arabinoside (ARA-C). The labelling-cloning relationship was poor, with brief drug exposure times, but improved progressively after drug treatment of 1 cell-cycle time's duration. Labelling changes resulting from short-term exposure to drug (several hours) provided poor predictions of the cytotoxicity resulting from longer drug exposure.
mesh_terms: D000818:Animals; D002453:Cell Cycle / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects*; D002999:Clone Cells / Q000187:drug effects; D003561:Cytarabine / Q000494:pharmacology*; D003857:Deoxyuridine / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D005472:Fluorouracil / Q000494:pharmacology*; D006801:Humans; D007939:Leukemia L1210 / Q000378:metabolism / Q000473:pathology; D008545:Melanoma / Q000378:metabolism / Q000473:pathology; D008727:Methotrexate / Q000494:pharmacology*; D051379:Mice; D014316:Tritium
chemical_list: D003561:Cytarabine; D014316:Tritium; D005472:Fluorouracil; D003857:Deoxyuridine; D008727:Methotrexate