journal article Nov 17, 2021

Quantification of cytochrome c oxidase and tissue oxygenation using CW-NIRS in a mouse cerebral cortex

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Abstract
We provide a protocol for measuring the absolute concentration of the oxidized and reduced state of cytochrome c oxidase (CCO) in the cerebral cortex of mice, using broadband continuous-wave NIRS. The algorithm (NIR-AQUA) allows for absolute quantification of CCO and deoxyhemoglobin. Combined with an anoxia pulse, this also allows for quantification of total hemoglobin, and tissue oxygen saturation. CCO in the cortex was 4.9 ± 0.1 μM (mean ± SD, n=6). In normoxia, 84% of CCO was oxidized. We include hypoxia and cyanide validation studies to show CCO can be quantified independently to hemoglobin. This can be applied to study oxidative metabolism in the many rodent models of neurological disease.
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Details
Published
Nov 17, 2021
Vol/Issue
12(12)
Pages
7632
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Funding
National Institutes of Health Award: R21 EB021397
Canada Foundation for Innovation Award: Project 4933
Natural Sciences and Engineering Research Council of Canada Award: RGPIN-2015-06517
Alberta Graduate Excellence Scholarship
Eyes High International Doctoral Scholarship
Cite This Article
Mada Hashem, Ying Wu, Jeff F. Dunn (2021). Quantification of cytochrome c oxidase and tissue oxygenation using CW-NIRS in a mouse cerebral cortex. Biomedical Optics Express, 12(12), 7632. https://doi.org/10.1364/boe.435532