A Dual-Role Played by Extracellular ATP in Frequency-Filtering of the Nucleus Tractus Solltarii Network
ATP is now identified to be an important signaling molecule in the CNS1, 2, 3. However, there are only few brain regions in which the function of ATP-mediated signaling is demonstrated from the molecular to whole animal levels. The caudal part of the nucleus of the solitary tract (cNTS) is such a rare structure. In the cNTS, neuronal ATP release4,5, hypoxia-induced increase in purine concentration6, abundant expression of P2X and P2Y receptors7, 8, 9, 10, 11, 12, extracellular hydrolysis of ATP to adenosine4,13, and rich expression of adenosine transporters14 have been demonstrated. In addition, a microinjection of agonists for P2X and adenosine receptors into cNTS in anesthetized rats exerts profound cardiorespiratory effects15, 16, 17. Taken together, ATP, in tandem with its extracellular metabolite adenosine, is thought to be involved in the neuronal signaling in the cNTS, where various visceral signals including those from pulmonary stretch receptors and peripheral chemoreceptor converge.
KeywordsNucleus Tractus Solitarii Solitary Tract Pulmonary Stretch Receptor Gallamine Triethiodide sEPSC Frequency
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