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Modulation of a Plant Mitochondrial K+ ATP Channel and Its Involvement in Cytochrome c Release

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Abstract

Pea stem mitochondria, resuspended in a KCl medium (de-energized mitochondria), underwent a swelling, as a consequence of K+ entry, that was inhibited by ATP. This inhibition was partially restored by GTP and diazoxide (K+ ATP channel openers). In addition, glyburide and 5-hydroxydecanate (K+ ATP channel blockers) induced an inhibition of the GTP-stimulated swelling. Mitochondrial swelling was inhibited by H2O2, but stimulated by NO. The same type of responses was also obtained in succinate-energized mitochondria. When the succinate-dependent transmembrane electrical potential (ΔΨ) had reached a steady state, the addition of KCl induced a dissipation that was inhibited by H2O2 and stimulated by NO. The latter stimulation was prevented by carboxy-PTIO, a NO scavenger. Phenylarsine oxide (a thiol oxidant) and NEM (a thiol blocker) stimulated the KCl-induced dissipation of ΔΨ, while DTE prevented this effect in both cases. In addition, DTE transiently inhibited the NO-induced dissipation of ΔΨ, but then it caused a more rapid collapse. These results, therefore, show that the plant mitochondrial K+ ATP channel resembles that present in mammalian mitochondria and that it appears to be modulated by dithiol–disulfide interconversion, NO and H2O2. The aperture of this channel was linked to the partial rupture of the outer membrane. The latter effect led to a release of cytochrome c, thus suggesting that this release may be involved in the manifestation of programmed cell death.

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Authors and Affiliations

  1. Department of Biology and Agro-industrial Economics, Section of Plant Biology, University of Udine, via Cotonificio 108, I-33100, Udine, Italy

    Elisa Chiandussi, Elisa Petrussa, Francesco Macrì & Angelo Vianello

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  1. Elisa Chiandussi
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  2. Elisa Petrussa
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  3. Francesco Macrì
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  4. Angelo Vianello
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Correspondence to Angelo Vianello.

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Chiandussi, E., Petrussa, E., Macrì, F. et al. Modulation of a Plant Mitochondrial K+ ATP Channel and Its Involvement in Cytochrome c Release. J Bioenerg Biomembr 34, 177–184 (2002). https://doi.org/10.1023/A:1016079319070

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