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Structure-function relationship of T-2 toxin and its metabolites in inducing thymic apoptosis in vivo in mice
Abstract:
Recently we found that a single administration of T-2 toxin (T-2), a trichothecene mycotoxin, into mice induced DNA fragmentation, a biochemical hallmark of apoptosis, in the thymus. In this study, we investigated the effective chemical structure(s) of T-2-derived metabolites capable of inducing thymic apoptosis in vivo in mice. Metabolic conversion of T-2 to 3'-hydroxy-T-2 toxin (3'-OH-T-2) did not diminish the apoptosis-inducing activity, since essentially the same level of fragmented DNA was detected in the thymus taken from mice injected with either T-2 or 3'-OH-T-2. In contrast, hydrolysis of T-2 and 3'-OH-T-2 at the carbon-4 (C-4) position to HT-2 toxin (HT-2) and 3'-hydroxy-HT-2 toxin (3'-OH-HT-2), respectively, greatly decreased the level of DNA fragmentation. Similarly, hydrolysis of T-2 at the carbon-8 (C-8) position to neosolaniol strongly diminished its ability to induce DNA fragmentation. T-2 tetraol, having no ester groups, was unable to induce apoptosis. Based on the data presented in this study, we concluded that both the acetyl group at the C-4 position and the isovaleryl or 3'-hydroxyisovaleryl group at the C-8 position of the T-2 molecule are important for inducing cell death through apoptosis in the thymus.
Insights
T-2 toxin, a mycotoxin, induces thymic apoptosis. Its metabolites, 3'-hydroxy-T-2 toxin, retain this activity, while hydrolysis at C-4 or C-8 positions significantly reduces it, indicating key structural requirements for apoptosis induction.
Area of Science:
- Toxicology
- Immunology
- Molecular Biology
Background:
- T-2 toxin is a trichothecene mycotoxin known to induce apoptosis.
- Previous studies indicated T-2 toxin causes DNA fragmentation in the thymus, a marker of apoptosis.
Purpose of the Study:
- To identify the specific chemical structures of T-2 toxin metabolites responsible for inducing thymic apoptosis in vivo.
- To elucidate the role of functional groups on the T-2 molecule in mediating apoptosis.
Main Methods:
- Administration of T-2 toxin and its derivatives to mice.
- Assessment of DNA fragmentation in thymocytes as a measure of apoptosis.
- Chemical structure analysis of T-2 toxin and its metabolites.
Main Results:
- Metabolic conversion to 3"-hydroxy-T-2 toxin (3"-OH-T-2) did not alter apoptosis-inducing activity compared to T-2 toxin.
- Hydrolysis at the C-4 position (to HT-2 toxin or 3"-OH-HT-2) significantly reduced DNA fragmentation.
- Hydrolysis at the C-8 position (to neosolaniol) also markedly diminished the apoptosis-inducing potential.
- T-2 tetraol, lacking ester groups, failed to induce apoptosis.
Conclusions:
- The acetyl group at the C-4 position and the isovaleryl or 3"-hydroxyisovaleryl group at the C-8 position of T-2 toxin are crucial for inducing thymic apoptosis.
- Structural integrity of these ester groups is essential for the mycotoxin's ability to trigger programmed cell death in the thymus.
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