Abstract
In this study, we investigated the effects of biapigenin, a biflavone present in the extracts of Hypericum perforatum, in rat brain mitochondrial bioenergetics and calcium homeostasis. We found that biapigenin significantly decreased adenosine diphosphate (ADP)-induced membrane depolarization and increased repolarization (by 68 and 37%, respectively). These effects were blocked by atractyloside and bongkrekic acid, but not oligomycin. In the presence of biapigenin, an ADP-stimulated state 3 respiration was still noticeable, which did not happen in the presence of adenine nucleotide translocator (ANT) inhibitors. Taking in consideration the relevance of the ANT in the modulation of the mitochondrial permeability transition pore (mPTP), mitochondrial calcium homeostasis was evaluated alone or in the presence of biapigenin. We found that biapigenin reduces mitochondrial calcium retention by increasing calcium efflux, an effect that was blocked by ADP plus oligomycin, an efficient blocker of the mPTP in brain mitochondria. Taken together, the results in this article suggest that biapigenin modulates mPTP opening, possibly by modulating ANT function, contributing for enhanced mitochondrial calcium efflux, thereby reducing calcium burden and contributing for neuroprotection against excitotoxicity.
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Abbreviations
- ΔΨm :
-
Mitochondrial transmembrane electric potential
- ANT:
-
Adenosine nucleotide translocator
- CsA:
-
Cyclosporin A
- FCCP:
-
Carbonyl cyanide 4-(trifluoromethoxy) phenylhydrazone
- mPTP:
-
Mitochondrial permeability transition pore
- TPP:
-
Tetraphenylphosphonium-chloride
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Acknowledgment
We acknowledge the Portuguese Foundation for Science and Technology and FEDER for support, PhD grant SFRH/BD/13488/2003, and research projects POCI/SAU-NEU/58492/2004.
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Silva, B.A., Oliveira, P.J., Cristóvão, A. et al. Biapigenin Modulates the Activity of the Adenine Nucleotide Translocator in Isolated Rat Brain Mitochondria. Neurotox Res 17, 75–90 (2010). https://doi.org/10.1007/s12640-009-9082-5
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DOI: https://doi.org/10.1007/s12640-009-9082-5