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Advances in cellular and integrative control of oxygen homeostasis within the central nervous system

Journal of Physiology, ISSN: 1469-7793, Vol: 596, Issue: 15, Page: 3043-3065
2018
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Mammals must continuously regulate the levels of O and CO, which is particularly important for the brain. Failure to maintain adequate O/CO homeostasis has been associated with numerous disorders including sleep apnoea, Rett syndrome and sudden infant death syndrome. But, O/CO homeostasis poses major regulatory challenges, even in the healthy brain. Neuronal activities change in a differentiated, spatially and temporally complex manner, which is reflected in equally complex changes in O demand. This raises important questions: is oxygen sensing an emergent property, locally generated within all active neuronal networks, and/or the property of specialized O-sensitive CNS regions? Increasing evidence suggests that the regulation of the brain's redox state involves properties that are intrinsic to many networks, but that specialized regions in the brainstem orchestrate the integrated control of respiratory and cardiovascular functions. Although the levels of O in arterial blood and the CNS are very different, neuro-glial interactions and purinergic signalling are critical for both peripheral and CNS chemosensation. Indeed, the specificity of neuroglial interactions seems to determine the differential responses to O, CO and the changes in pH. (Figure presented.).

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