Abstract
Purpose: To study the interplay of drugs and energy metabolism of tumor cells, metabolic changes induced by chloroacetaldehyde and cytochalasin B were analyzed in colon carcinoma cells LS174T. Methods: O2-consumption and extracellular acidification were recorded using a bioelectronic sensor-chip system, which monitors these parameters in a culture continuously for at least 24 h. In parallel cultures cell number, cellular ATP-content, mitochondrial transmembrane potential, and the content of reactive oxygen species (ROS) were determined. Results: When cell death was induced by chloroacetaldehyde (50 μM), the rate of acidification declined gradually for the next 15 h, while O2-consumption decreased rapidly within 30 min. This correlated with a loss in mitochondrial potential. However, cellular ATP-level showed a transient increase at 2 h; also ROS levels increased up to 6 h. In cells treated with cytochalasin B (2 μM), which inhibits glucose uptake, the rate of O2-consumption increased and the acidification activity dropped, even upon glutamine depletion. Mitochondrial membrane potential transiently increased after 1 h, while ATP-content decreased; there was no change in the level of ROS. Conclusion: The pattern of changes in basic energy metabolism differs with the type of cell death and growth inhibition involved in the cytotoxic action of two different drugs.
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The technical assistance of Gudrun Teschner and Alfred Michelfelder is gratefully acknowledged. We thank Dr. Lisa Sprague for fruitful discussions on the manuscript.
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Motrescu, E.R., Otto, A.M., Brischwein, M. et al. Dynamic analysis of metabolic effects of chloroacetaldehyde and cytochalasin B on tumor cells using bioelectronic sensor chips. J Cancer Res Clin Oncol 131, 683–691 (2005). https://doi.org/10.1007/s00432-005-0015-2
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DOI: https://doi.org/10.1007/s00432-005-0015-2