Abstract
The antibacterial amino-acid derivative taurolidine (TAU) has been recently shown to exhibit anti-neoplastic activity based on a mechanism, which is still unknown in detail. Cytotoxicity and clonogenic assays were performed and the impact of apoptosis modulators, a radical scavenger, autophagy inhibitors, silencing of apoptosis inducing actor (AIF) and cytochrome-c (Cyt-C) by siRNA, and knockdown of autophagy related genes were evaluated in vitro. The intracellular ATP-content, release of AIF and Cyt-C, and DNA-laddering were investigated. This study could demonstrate cell killing, inhibition of proliferation, and inhibition or prevention of colony formation in human glioma cell lines and ex vivo glioblastoma cells after incubation with TAU. This effect is based on the induction of a mixed type of programmed cell death with the main preference of autophagy, and involvement of senescence, necroptosis and necrosis. This mechanism of action may open a new approach for therapeutic intervention.
MeSH terms
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Adenosine Triphosphate / metabolism
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Anti-Bacterial Agents / pharmacology*
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Antineoplastic Agents / pharmacology*
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Apoptosis / drug effects*
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Apoptosis Inducing Factor / metabolism
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Caspase Inhibitors
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Cell Membrane / drug effects
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Cell Membrane / ultrastructure
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Cell Proliferation / drug effects
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Cell Shape / drug effects
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Cell Survival / drug effects
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Cellular Senescence / drug effects
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Cytochromes c / genetics
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Cytochromes c / metabolism
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DNA Fragmentation / drug effects
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Enzyme Inhibitors / pharmacology
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Exocytosis / drug effects
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Flow Cytometry
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Gene Silencing / drug effects
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Genetic Vectors / genetics
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Humans
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Intracellular Space / drug effects
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Intracellular Space / metabolism
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Microtubule-Associated Proteins / metabolism
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Neoplastic Stem Cells / drug effects
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Neoplastic Stem Cells / pathology
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Phosphatidylserines / metabolism
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RNA, Small Interfering / metabolism
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Recombinant Fusion Proteins / metabolism
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Taurine / analogs & derivatives*
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Taurine / pharmacology
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Thiadiazines / pharmacology*
Substances
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Anti-Bacterial Agents
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Antineoplastic Agents
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Apoptosis Inducing Factor
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Caspase Inhibitors
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Enzyme Inhibitors
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MAP1LC3A protein, human
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Microtubule-Associated Proteins
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Phosphatidylserines
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RNA, Small Interfering
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Recombinant Fusion Proteins
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Thiadiazines
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Taurine
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Adenosine Triphosphate
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taurolidine
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Cytochromes c