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Related Experiment Video

Updated: Jan 20, 2026

Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
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Atherosclerosis is associated with a decrease in cerebral microvascular blood flow and tissue oxygenation.

Baoqiang Li1,2, Xuecong Lu1,2, Mohammad Moeini3

  • 1Institute of Biomedical Engineering, École Polytechnique de Montréal, Montréal, QC, Canada.

Plos One
|August 31, 2019
PubMed
Summary
This summary is machine-generated.

Atherosclerosis impairs brain oxygenation and cognitive function. Old atherosclerotic mice showed reduced oxygen levels and blood flow compared to young mice, indicating less efficient oxygen extraction.

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Area of Science:

  • Neuroscience
  • Cardiovascular Science
  • Medical Imaging

Background:

  • Chronic atherosclerosis can lead to cerebral hypoperfusion and inadequate brain oxygenation.
  • These conditions are implicated in the progression of cognitive decline.

Purpose of the Study:

  • To investigate the relationship between atherosclerosis, cerebral oxygenation, and microvascular function.
  • To compare tissue oxygen levels and capillary dynamics in young versus old atherosclerotic mice.

Main Methods:

  • Utilized two-photon phosphorescence lifetime microscopy to measure absolute partial pressure of oxygen (PO2) in cortical tissue.
  • Assessed capillary red-blood-cell (RBC) speed, flux, hematocrit, and diameter using two-photon imaging of labeled blood plasma.
  • Studied young and old LDLR-/-, hApoB100+/+ mice models of spontaneous atherosclerosis.

Main Results:

  • Found positive correlations between RBC speed, flux, diameter, and capillary-adjacent tissue PO2.
  • Observed significantly lower tissue PO2, RBC speed and flux, and smaller capillary diameter in old atherosclerotic mice compared to young mice.
  • Noted increased spatial heterogeneity of tissue PO2, RBC speed, and flux in older mice, suggesting impaired oxygen extraction.

Conclusions:

  • Age-related atherosclerosis exacerbates cerebral hypoperfusion and impairs oxygen delivery to the brain.
  • Reduced capillary blood flow and increased heterogeneity in oxygen levels contribute to less efficient brain oxygen extraction in aged atherosclerotic mice.