Abstract
Nitric oxide (•NO) is an ubiquitous signaling molecule that participates in molecular processes associated with several neural phenomena ranging from memory formation to excitotoxicity. In the hippocampus, neuronal •NO production is coupled to the activation of NMDA type glutamate receptors. Cytochrome c oxidase has emerged as a novel target for •NO, which competes with O2 for binding to this mitochondrial complex. This reaction establishes •NO as a regulator of cellular metabolism and, possibly, mitochondrial production of reactive oxygen species which participate in cellular signaling. A major gap in the understanding of •NO bioactivity, namely, in the hippocampus, has been the lack of knowledge of its concentration dynamics. Here, we present a detailed description of the simultaneous recording of •NO and O2 concentration dynamics in rat hippocampal slices. Carbon fiber microelectrodes are fabricated and applied for real-time measurements of both gases in a system close to in vivo models. This approach allows for a better understanding of the current paradigm by which an intricate interplay between •NO and O2 regulates cellular respiration.
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Acknowledgments
This work was funded by FEDER via the COMPETE 2020 Program and National Funds via FCT (Fundação para a Ciência e Tecnologia, Portugal) through the strategical project POCI-01-0145-FEDER-007440.
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Ledo, A., Barbosa, R.M., Laranjinha, J. (2018). Modulation of Cellular Respiration by Endogenously Produced Nitric Oxide in Rat Hippocampal Slices. In: Palmeira, C., Moreno, A. (eds) Mitochondrial Bioenergetics. Methods in Molecular Biology, vol 1782. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-7831-1_5
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DOI: https://doi.org/10.1007/978-1-4939-7831-1_5
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