A panel of doxorubicin-resistant sublines of the human small-cell lung carcinoma cell line GLC4 displays decreasing DNA topoisomerase II alpha (TopoII alpha) mRNA levels with increasing resistance.
Differential expression of DNA topoisomerase II alpha and -beta in P-gp and MRP-negative VM26, mAMSA and mitoxantrone-resistant sublines of the human SCLC cell line GLC4.
The titration assay was used to quantitate the amount of DNA topoisomerase II alpha mRNA in a human small cell lung carcinoma cell line, GLC4 and its drug-resistant sublines, GLC4/ADR and GLC4/CDDP.
We characterized a rearrangement of the topoisomerase II p170 gene (also known as TOP2) in a relatively chemoresistant SCLC cell line, NCI-H69, and compared topoisomerase II expression and activity in this line with those in the chemosensitive NCI-H187 cell line.