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Mapping oxygen concentration in the awake mouse brain.

Declan G Lyons1,2, Alexandre Parpaleix1,2, Morgane Roche1,2

  • 1Institut National de la Santé et de la Recherche Médicale, U1128, Paris, France.

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|February 3, 2016
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Summary

Researchers mapped cerebral oxygen levels in awake mice, revealing lower oxygen partial pressure (Po2) than previously measured under anesthesia. This non-invasive technique provides crucial insights into brain metabolism under physiological conditions.

Keywords:
blood flowcortexhuman biologymedicinemouseneuroscienceolfactory bulboxygenphosphorescencetwo-photon microscopy

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Area of Science:

  • Neuroscience
  • Physiology
  • Biophysics

Background:

  • Cerebral oxygen concentration is vital for brain function but difficult to measure accurately.
  • Previous high-resolution studies were conducted under anesthesia, altering neuronal activity and blood flow.
  • Anesthesia's impact on brain oxygenation parameters necessitates studies under physiological conditions.

Purpose of the Study:

  • To perform the first non-invasive, micron-scale mapping of cerebral oxygen partial pressure (Po2) in awake, resting mice.
  • To compare cerebral Po2 measurements in awake mice with those obtained under anesthesia.
  • To investigate layer-specific differences in vascular and interstitial Po2 within the cortex.

Main Methods:

  • Utilized measurements of capillary erythrocyte-associated transients to infer neuropil Po2.
  • Developed a non-invasive technique for micron-scale mapping of cerebral Po2.
  • Conducted measurements in awake, resting mice, comparing results with data from isoflurane anesthesia.

Main Results:

  • Interstitial Po2 values were similar in the olfactory bulb glomerular layer and somatosensory cortex.
  • Significant differences were observed in capillary hematocrit and erythrocyte flux between brain regions.
  • Awake tissue Po2 was approximately half that measured under isoflurane anesthesia.
  • Cortical vascular and interstitial Po2 exhibited layer-specific differences distinct from anesthetized conditions.

Conclusions:

  • Non-invasive Po2 mapping in awake mice reveals significantly lower oxygen levels than previously reported under anesthesia.
  • Physiological Po2 values in the brain differ substantially from those measured under anesthesia.
  • Accurate quantification and modeling of brain metabolism require non-invasive measurements under physiological conditions.