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A method for estimating the oxygen consumption rate in multicellular tumour spheroids
David Robert Grimes1, Catherine Kelly, Katarzyna Bloch
1The Gray Institute for Radiation Oncology and Biology, University of Oxford, , Old Road Campus Research Building, Oxford OX3 7DQ, UK.
Journal of the Royal Society, Interface
|January 17, 2014
Summary
This study presents a new method to measure oxygen consumption in three-dimensional tumor spheroids, crucial for understanding tumor hypoxia and improving cancer imaging and radiotherapy. The findings provide key parameters for oxygen diffusion and consumption rates in these models.
Area of Science:
- Biomedical Engineering
- Cancer Research
- Mathematical Modeling
Background:
- Tumor hypoxia, a state of low oxygen, is linked to poor cancer prognosis, metastasis, and treatment resistance.
- Current imaging techniques like positron emission tomography aid in monitoring tumor hypoxia for radiotherapy planning.
- Understanding the relationship between imaging contrast and oxygen distribution is vital, yet tumor oxygen consumption is often overlooked in models.
Purpose of the Study:
- To develop and validate a method for estimating oxygen consumption rates in three-dimensional (3D) tumor spheroids.
- To derive methods for quantifying local oxygen partial pressure, diffusion limits, and the extent of necrotic, hypoxic, and proliferating regions within spheroids.
- To bridge the gap between mathematical modeling of tissue hypoxia and experimental validation for improved tumor characterization.
Main Methods:
- Building upon existing models of oxygen diffusion and consumption in 3D tumor spheroids.
- Developing novel methods to estimate oxygen consumption rates, validated with stained spheroid sections.
- Deriving techniques to measure oxygen partial pressure, diffusion limits, and regional extents (necrotic, hypoxic, proliferating) within spheroids.
- Validating derived methods using experimental data from DLD1 spheroids at various growth stages.
Main Results:
- A method for estimating oxygen consumption rates in 3D tumor spheroids was successfully developed and validated.
- Experimental data yielded a consistent diffusion limit of 232 ± 22 micrometers.
- An average oxygen consumption rate of 7.29 ± 1.4 × 10⁻⁷ m³ kg⁻¹ s⁻¹ was measured for the studied spheroids, aligning with laboratory findings.
Conclusions:
- The study provides a validated method for quantifying oxygen consumption and diffusion parameters in 3D tumor spheroids.
- These findings contribute to a better understanding of the link between quantitative oxygen distribution and imaging contrast in tumors.
- The derived parameters are valuable for improving mathematical models of tumor hypoxia and informing radiotherapy strategies.
