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In vitro simultaneous mapping of the partial pressure of oxygen, pH and inorganic phosphate using electron paramagnetic resonance

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Abstract

The partial pressure of oxygen (pO2) and the extracellular pH in the tumour microenvironment are essential parameters for understanding the physiological state of a solid tumour. Also, phosphate-containing metabolites are involved in energy metabolism, and interstitial inorganic phosphate (Pi) is an informative marker for tumour growth. This article describes the simultaneous mapping of pO2, pH and Pi using 750 MHz continuous-wave (CW) electron paramagnetic resonance (EPR) and a multifunctional probe, monophosphonated trityl radical p1TAM-D. The concept was demonstrated by acquiring three-dimensional (3D) maps of pO2, pH and Pi for multiple solution samples. This was made possible by combining a multifunctional radical probe, fast CW-EPR spectral acquisition, four-dimensional (4D) spectral–spatial image reconstruction, and spectral fitting. The experimental results of mapping pO2, pH and Pi suggest that the concept of simultaneous mapping using EPR is potentially applicable for the multifunctional measurements of a mouse tumour model.

Graphical abstract: In vitro simultaneous mapping of the partial pressure of oxygen, pH and inorganic phosphate using electron paramagnetic resonance

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Article information


Submitted
22 Jan 2020
Accepted
25 Feb 2020
First published
26 Feb 2020

Analyst, 2020, Advance Article
Article type
Paper

In vitro simultaneous mapping of the partial pressure of oxygen, pH and inorganic phosphate using electron paramagnetic resonance

A. Taguchi, S. DeVience, B. Driesschaert, V. V. Khramtsov and H. Hirata, Analyst, 2020, Advance Article , DOI: 10.1039/D0AN00168F

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