A rapid anticancer drug screening assay by [14C] thymidine uptake in cultured human cancer cells

Area of Science:

• Oncology
• Biochemistry
• Pharmacology

Background:

• Accurate assessment of anticancer drug efficacy is crucial for cancer treatment.
• Existing screening methods may have limitations in detecting drug-induced cellular changes.

Purpose of the Study:

• To develop and evaluate a rapid screening test for anticancer drug efficacy based on DNA synthesis suppression.
• To compare the performance of the [methyl-14C]-thymidine (14C-TdR) assay with other methods like MTT and cell count.

Main Methods:

• Development of a rapid screening test utilizing [methyl-14C]-thymidine (14C-TdR) to measure DNA synthesis suppression in cancer cells.
• Application of the assay using a microculture filtration plate and radiochromatoscanner.
• Testing of mitomycin, tamoxifen, and 5-fluorouracil (5-FU) against human gastric cancer cell lines and HeLa cells.

Main Results:

• The 14C-TdR assay and cell count provided more accurate assessments of mitomycin's cell inactivation compared to the MTT assay in several cell lines.
• The 14C-TdR uptake assay showed lower inactivation by 5-FU in one cell line than other methods.
• Discrepancies indicate that neither radio-labelled DNA precursor uptake nor MTT assays are universally suitable for all anticancer drugs.

Conclusions:

• The developed [methyl-14C]-thymidine assay offers a valuable tool for screening anticancer drugs by measuring DNA synthesis inhibition.
• Both radio-labelled DNA precursor uptake and MTT assays have limitations and can be complementary in evaluating drug efficacy.
• Careful selection of assay methods is necessary depending on the specific anticancer drug being tested.