title: A simple method for producing different growth fractions in vitro for use in anti-cancer drug studies.
abstract: A simple technique has been used experimentally to produce in vitro Chinese hamster ovary cells with growth fractions ranging from 0 to 100%. Known numbers of exponentially growing and plateau-phase tissue culture cells were mixed in various proportions to yield the desired final growth fraction. Cells attach to the culture flask surface within 1 hr of mixing. Treatment at that time with the nitrosourea compounds, CCNU and MeCCNU, resulted in differential drug survival sensitivities that were dependent upon the growth fraction of the population treated.
mesh_terms: D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival; D006224:Cricetinae; D003412:Cricetulus; D004353:Drug Evaluation, Preclinical / Q000379:methods*; D008130:Lomustine / Q000494:pharmacology*; D009607:Nitrosourea Compounds / Q000494:pharmacology*; D012673:Semustine / Q000494:pharmacology*
chemical_list: D009607:Nitrosourea Compounds; D012673:Semustine; D008130:Lomustine