Document Type
Article
Date
4-24-2006
Keywords
Pd phosphor, palladium derivative of meso-tetra-(4-sulfonatophenyl)-tetrabenzoporphyrin; k, zero-order rate constant for cellular oxygen consumption; zVAD-fmk, benzyloxycarbonyl-val-alaasp- fluoromethyl ketone
Disciplines
Chemistry
Description/Abstract
The effect of dactinomycin on cellular respiration and accompanying ATP formation was investigated in Jurkat and HL-60 cells. Cellular mitochondrial oxygen consumption (measured by a homemade phosphorescence analyzer) and ATP content (measured by the luciferin-luciferase bioluminescence system) were determined as functions of time t during continuous exposure to the drug. The rate of respiration, k, was the negative of the slope of [O2] versus t. Oxygen consumption and ATP content were diminished by cyanide, confirming that both processes involved oxidations in the mitochondrial respiratory chain. In the presence of dactinomycin, k decreased gradually with t, the decrease being more pronounced at higher drug concentrations. Cellular ATP remained constant for 5 h in untreated cells, but in the presence of 20 microM dactinomycin it decreased gradually (to one-tenth the value at 5 h for untreated cells). The drug-induced inhibition of respiration and decrease in ATP were blocked by the pancaspase inhibitor benzyloxycarbonyl-Val-Ala-DL-Asp-fluoromethyl ketone (zVAD-fmk). A rapid but temporary decrease in cellular ATP observed on the addition of zVAD-fmk was shown to be due to DMSO (added with zVAD-fmk). The effect of dactinomycin on respiration differed from that of doxorubicin. Plots of [O2] versus t were curved for dactinomycin so that k decreased gradually with t. The corresponding plots for doxorubicin were well fit by two straight lines; so k was constant for approximately 150 min, at which time k decreased, remaining constant at a lower level thereafter. The results for cells treated with mixtures of the two drugs indicated that the drugs acted synergistically. These results show the onset and severity of mitochondrial dysfunction in cells undergoing apoptosis induced by dactinomycin.
Recommended Citation
Tao, Z., Ahmad, S. S., Penefsky, H. S., Goodisman, J., & Souid, A. -. (2006). Dactinomycin impairs cellular respiration and reduces accompanying ATP formation. Molecular Pharmaceutics, 3(6), 762-772.
Source
Local input
Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.
Additional Information
Reprinted with permission from Tao, Z., Ahmad, S. S., Penefsky, H. S., Goodisman, J., & Souid, A. -. (2006). Dactinomycin impairs cellular respiration and reduces accompanying ATP formation. Molecular Pharmaceutics, 3(6), 762-772. Copyright 2006 American Chemical Society.
http://pubs.acs.org/doi/pdf/10.1021/mp0600485