Astrocytes control breathing through pH-dependent release of ATP
- PMID: 20647426
- PMCID: PMC3160742
- DOI: 10.1126/science.1190721
Astrocytes control breathing through pH-dependent release of ATP
Abstract
Astrocytes provide structural and metabolic support for neuronal networks, but direct evidence demonstrating their active role in complex behaviors is limited. Central respiratory chemosensitivity is an essential mechanism that, via regulation of breathing, maintains constant levels of blood and brain pH and partial pressure of CO2. We found that astrocytes of the brainstem chemoreceptor areas are highly chemosensitive. They responded to physiological decreases in pH with vigorous elevations in intracellular Ca2+ and release of adenosine triphosphate (ATP). ATP propagated astrocytic Ca2+ excitation, activated chemoreceptor neurons, and induced adaptive increases in breathing. Mimicking pH-evoked Ca2+ responses by means of optogenetic stimulation of astrocytes expressing channelrhodopsin-2 activated chemoreceptor neurons via an ATP-dependent mechanism and triggered robust respiratory responses in vivo. This demonstrates a potentially crucial role for brain glial cells in mediating a fundamental physiological reflex.
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Comment in
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Neuron-glia interactions: Astrocytes in the air.Nat Rev Neurosci. 2010 Sep;11(9):610. doi: 10.1038/nrn2905. Nat Rev Neurosci. 2010. PMID: 20803792 No abstract available.
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