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Related Experiment Video

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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging

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Transient decrease in tumor oxygenation after intravenous administration of pyruvate.

Keita Saito¹, Shingo Matsumoto, Nallathamby Devasahayam

¹Radiation Biology Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland 20892-1002, USA.

Magnetic Resonance in Medicine

|October 19, 2011

Summary

This summary is machine-generated.

Injecting hyperpolarized carbon-13 labeled pyruvate for MRI scans temporarily lowers tumor oxygen levels. This transient hypoxia can impact radiotherapy effectiveness, highlighting the need to consider oxygen status in cancer imaging and treatment.

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Area of Science:

Biomedical Imaging
Oncology
Medical Physics

Background:

Hyperpolarized carbon-13 labeled pyruvate MRI is a key tool for tumor biochemical profiling and therapy response monitoring.
Exogenous pyruvate injection's impact on the tumor microenvironment, particularly oxygen status, is not fully understood.

Purpose of the Study:

To investigate the effect of bolus pyruvate injection on tumor oxygen status.
To assess the influence of pyruvate-induced transient hypoxia on radiotherapy efficacy.

Main Methods:

Electron paramagnetic resonance (EPR) oxygen imaging to measure partial pressure of oxygen (pO(2)).
Dynamic contrast-enhanced MRI (DCE-MRI) to evaluate tumor perfusion.
Immunohistochemical analysis using pimonidazole to detect hypoxia.

Main Results:

Pyruvate injection caused a significant, transient decrease in tumor pO(2) within 30 minutes, returning to baseline after 5 hours.
No significant changes in tumor perfusion were observed at the administered pyruvate dose.
Pyruvate injection led to transient tumor hypoxia, verified by pimonidazole staining.
Radiotherapy efficacy was reduced when administered during the period of pyruvate-induced transient hypoxia.

Conclusions:

Exogenous pyruvate injection transiently decreases tumor oxygen levels, a critical factor in hyperpolarized MRI.
The transient hypoxia induced by pyruvate can suppress radiotherapy efficacy.
Consideration of pyruvate-induced transient changes in tumor oxygen status is crucial for accurate interpretation of hyperpolarized MRI and optimizing cancer therapy.