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The atypical pattern of cell death in B16F10 melanoma cells treated with TNP-470
Marcin Okrój1, Dorota Stawikowska, Ewa M Słomińska
1Department of Medical Biotechnology, Intercollegiate Faculty of Biotechnology, Medical University of Gdańsk, Debinki 1, Gdańsk, Poland. marcin.okroj@med.lu.se
Abstract:
TNP-470 is an acknowledged anti-angiogenic factor, and was studied clinically as an anti-cancer drug. We previously reported on an additional property of this molecule: the intracellular generation of reactive oxygen species in B16F10 melanoma cells. We showed that a massive generation of ROS occurred in the first few hours after treatment with TNP-470 and that this event was critical to subsequent cell death. In this study, we analyzed the process of cell death and noticed an atypical pattern of death markers. Some of these, such as DNA fragmentation or condensation of chromatin, were characteristic for programmed cell death, while others (the lack of phosphatidylserine flip-flop but permeability to propidium iodide, the maintenance of adhesion to the substratum, no change in mitochondrial transmembrane potential, no effect of the panspecific caspase inhibitor) rather suggested a necrotic outcome. We concluded that TNP-470 induced at least some pathways of programmed cell death. However, increasing damage to critical cell functions appears to cause a rapid switch into the necrotic mode. Our data is similar to that in other reports describing the action of ROS-generating agents. We hypothesize that this rapid programmed cell death/necrosis switch is a common scenario following free radical stress.
Insights
TNP-470 triggers cell death in melanoma cells by generating reactive oxygen species (ROS). This process involves a rapid switch from programmed cell death to necrosis, a common response to free radical stress.
Area of Science:
- Biochemistry
- Cell Biology
- Oncology
Background:
- TNP-470 is recognized for its anti-angiogenic properties and has been investigated as an anti-cancer therapeutic.
- Previous research indicated TNP-470 induces intracellular reactive oxygen species (ROS) generation in B16F10 melanoma cells.
- This ROS generation was found to be critical for subsequent cell death.
Purpose of the Study:
- To analyze the cell death mechanisms induced by TNP-470 in B16F10 melanoma cells.
- To investigate the atypical pattern of death markers observed following TNP-470 treatment.
- To understand the potential switch between programmed cell death and necrosis under ROS-generating conditions.
Main Methods:
- Analysis of cell death markers, including DNA fragmentation, chromatin condensation, phosphatidylserine flip-flop, and propidium iodide permeability.
- Assessment of cell adhesion to the substratum and mitochondrial transmembrane potential.
- Evaluation of the effect of a panspecific caspase inhibitor on cell death.
Main Results:
- TNP-470 treatment induced a mixed pattern of cell death markers, with some indicative of programmed cell death and others suggesting necrosis.
- Key indicators of programmed cell death (DNA fragmentation, chromatin condensation) were observed.
- Markers suggesting necrosis (phosphatidylserine flip-flop absence, propidium iodide permeability, maintained adhesion, intact mitochondrial potential, caspase inhibitor resistance) were also present.
Conclusions:
- TNP-470 initiates programmed cell death pathways in melanoma cells.
- Significant cellular damage rapidly shifts the cell death mode towards necrosis.
- The observed programmed cell death/necrosis switch may be a common response to oxidative stress induced by ROS-generating agents.
