Abstract
The cause-and-effect relationships between altered metabolism and neurological conditions are not fully understood. However, some metabolic conditions including ischemia/hypoxia, fasting and ketogenic diet therapy are known to modulate processes in the nervous system such as neuroprotection and seizures, indicating that altered metabolism can regulate neuronal excitability. Adenosine is one of the agents linking metabolism to neuronal activity. In this chapter, we discuss purinergic signaling via ATP release and subsequent activation of adenosine receptors, revealing a CNS pathway for metabolic autocrine regulation. ATP is the final product of brain energy metabolism and it can be an indicator of brain metabolic changes. ATP can be released to the extracellular space through sites including gap junction hemichannels, vesicles, and chloride channels. After subsequent dephosphorylation of ATP by ectonucleotidases, the resulting metabolite adenosine can activate adenosine receptors to limit neuronal excitability. All the proteins for purinergic signaling (ATP releasing sites, ectonucleotidases, and adenosine receptors) may be expressed in the same cell, allowing for autocrine regulation. We give one example: our finding of adenosinergic autoregulation through a cascade involving pannexin-1 channels, adenosine A1 receptors, and ATP-sensitive potassium channels in hippocampal CA3 pyramidal neurons. These neurons can react to changes in ATP and glucose levels with altered electrical activity through this purinergic signaling pathway. This pathway may underlie effects seen in ischemic conditions or during ketogenic diet treatment. Adenosinergic autocrine regulation might have a significant role in neuroprotection and seizure regulation in the CNS.
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Acknowledgments
We acknowledge the support of Grant-in Aid for Scientific Research (KAKENHI) for Young Scientists (B) (No. 23790303 to M.K.Jr.), Takeda Science Foundation (to M.K.Jr.) and of the National Institute of Neurological Disease and Stroke (No. NS-065446 to D.N.R.).
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Kawamura, M., Ruskin, D.N. (2013). Adenosine and Autocrine Metabolic Regulation of Neuronal Activity. In: Masino, S., Boison, D. (eds) Adenosine. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3903-5_4
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