Oxygen imaging of hypoxic pockets in the mouse cerebral cortex.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38547288.
- Also identified by DOI 10.1126/science.adn1011 and PMC identifier 11251491.
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Abstract
Consciousness is lost within seconds upon cessation of cerebral blood flow. The brain cannot store oxygen, and interruption of oxidative phosphorylation is fatal within minutes. Yet only rudimentary knowledge exists regarding cortical partial oxygen tension (<i>P</i>o<sub>2</sub>) dynamics under physiological conditions. Here we introduce Green enhanced Nano-lantern (GeNL), a genetically encoded bioluminescent oxygen indicator for <i>P</i>o<sub>2</sub> imaging. In awake behaving mice, we uncover the existence of spontaneous, spatially defined "hypoxic pockets" and demonstrate their linkage to the abrogation of local capillary flow. Exercise reduced the burden of hypoxic pockets by 52% compared with rest. The study provides insight into cortical oxygen dynamics in awake behaving animals and concurrently establishes a tool to delineate the importance of oxygen tension in physiological processes and neurological diseases.
Medical subject headings
- Cerebral Cortex
- Oxygen
- Cerebrovascular Circulation
- Hypoxia, Brain
- Luminescent Measurements
- Oxygen Saturation