Induction of tumour hypoxia by a vasoactive agent. A combined NMR and radiobiological study |
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| Authors: | J F Dunn S Frostick G E Adams I J Stratford N Howells G Hogan G K Radda |
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| Institution: | MRC Biochemical & Clinical Magnetic Resonance Unit, Department of Biochemistry, University of Oxford, England. |
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| Abstract: | The effect of hydralazine treatment on 3 murine tumours (RIF-1, KHT and 16/C) was monitored using 31P-NMR. Changes in the 31P-NMR spectrum are compared with measurements of radiobiological hypoxic fraction (RHF) in the RIF-1 and KHT. Hydralazine is known to reduce temporarily blood flow in experimental tumours, and thus cause a transient increase in the RHF to 100% (in RIF-1 and KHT). This correlates with a decline in energy status as measured by 31P-NMR (i.e. there was an increase in Pi in all three tumours). Time-course data from the RIF-1 and KHT tumours show that maintenance of anaesthesia prolongs the hypoxia induced by hydralazine. |
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