3-(1-deoxyribofuranosyl)benzamide and Leukemia--Promyelocytic--Acute

The inosine monophosphate (IMP) dehydrogenase inhibitor benzamide riboside (BR) induced apoptosis (detected with the aid of flow cytometric identification of cells with sub-G0 DNA content and increased side angle light scatter) equally or slightly more intensively in the multidrug-resistant human promyelocytic leukemia cell line (HL-60/VCR: MDR-1 gene, Pgp positive) in comparison with the parental drug sensitive HL-60 cells. Staurosporine alone induced relatively low level of apoptosis in parental HL-60 cells but higher level (approximately 35%) of apoptosis in multidrug-resistant HL-60/VCR cells after 24 hour induction. The combination of benzamide riboside and staurosporine induced in both drug-sensitive and drug-resistant HL-60 cells a marked proportion of apoptotic cells already after short (6 hour) induction (more than 30% of apoptotic cells).

Topics: Apoptosis; ATP Binding Cassette Transporter, Subfamily B, Member 1; DNA Fragmentation; Drug Resistance, Multiple; Drug Resistance, Neoplasm; Drug Synergism; Enzyme Inhibitors; Flow Cytometry; HL-60 Cells; Humans; IMP Dehydrogenase; Leukemia, Promyelocytic, Acute; Neoplasm Proteins; Nucleosides; Staurosporine