Abstract
The polyamine spermine is transported into the matrix of various types of mitochondria by a specific uniporter system identified as a protein channel. This mechanism is regulated by the membrane potential; other regulatory effectors are unknown. This study analyzes the transport of spermine in the presence of peroxides in both isolated rat liver and brain mitochondria, in order to evaluate the involvement of the redox state in this mechanism, and to compare its effect in both types of mitochondria. In liver mitochondria peroxides are able to inhibit spermine transport. This effect is indicative of redox regulation by the transporter, probably due to the presence of critical thiol groups along the transport pathway, or in close association with it, with different accessibility for the peroxides and performing different functions. In brain mitochondria, peroxides have several effects, supporting the hypothesis of a different regulation of spermine transport. The fact that peroxovanadate can inhibit tyrosine phosphatases in brain mitochondria suggests that mitochondrial spermine transport is regulated by tyrosine phosphorylation in this organ. In this regard, the evaluation of spermine transport in the presence of Src inhibitors suggests the involvement of Src family kinases in this process. It is possible that phosphorylation sites for Src kinases are present in the channel pathway and have an inhibitory effect on spermine transport under regulation by Src kinases. The results of this study suggest that the activity of the spermine transporter probably depends on the redox and/or tyrosine phosphorylation state of mitochondria, and that its regulation may be different in distinct organs.
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Abbreviations
- AIF:
-
Apoptosis-inducing factor
- PP2:
-
Amino-5-(4-chlorophenyl)-7-(t-butyl) pyrazolo [3,4d] pyrimidine
- PTP-1B:
-
Protein tyrosine phosphatase 1B
- RBM:
-
Rat brain mitochondria
- RLM:
-
Rat liver mitochondria
- ROS:
-
Reactive oxygen species
- SFKs:
-
Src family kinases
- SPM:
-
Spermine
- SU6656:
-
2,3-Dihydro-N,N-dimethyl-2-oxo-3-[(4,5,6,7-tetrahydro-1H-indol-2-yl)methylene]-1H-indole-5-sulfonamide
- tBOOH:
-
tert-Butyl-hydroperoxide
- TPP+ :
-
Tetraphenylphosphonium
- ΔΨ:
-
Electrical transmembrane potential
- ΔμH + :
-
Transmembrane electrochemical gradient
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We would like to thank the Institute Pasteur-Cenci Bolognetti foundation for financial support.
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The authors declare that they have no conflicts of interest.
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V. Battaglia, E. Tibaldi contributed equally to this work.
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Battaglia, V., Tibaldi, E., Grancara, S. et al. Effect of peroxides on spermine transport in rat brain and liver mitochondria. Amino Acids 42, 741–749 (2012). https://doi.org/10.1007/s00726-011-0990-3
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DOI: https://doi.org/10.1007/s00726-011-0990-3