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- W100688064 abstract "Hydralazine can substantially decrease the blood flow, oxygen status and energy metabolism of transplanted tumours. In spontaneous tumours, two recent studies reported no effects of hydralazine on energy metabolism measured by 31P-magnetic resonance spectroscopy (31P-MRS), although another study saw changes in oxygen partial pressure (pO2) distributions measured with electrodes. We have now performed 31P-MRS and pO2 measurements in the same T138 spontaneous tumours, before and after intravenously (i.v.) injecting anaesthetised mice with 5 mg kg-1 hydralazine. Tumour pO2 was measured with an Eppendorf oxygen electrode and 31P-MRS spectra obtained with a 7-tesla SISCO magnet. Of 12 tumours all showed an increase in the percentage of pO2 values < or = 5 mmHg after hydralazine treatment and 10/12 showed a decrease in median pO2. The average (+/-1 s.e.) values for the percentage < or = 5 mmHg went from 45% (+/-9) to 79% (+/-5) and the median from 9 mmHg (+/-2) to 2 mmHg (+/-1). With the 31P-MRS 8/12 tumours showed an increase in the ratio of the peaks of inorganic phosphate to beta-nucleoside triphosphate with the average (+/-1 s.e.) values going from 1.1 (+/-0.2) to 2.4 (+/-0.9). Thus spontaneous tumours can respond to hydralazine and do so in a way consistent with that reported for transplanted tumours." @default.
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- W100688064 date "1996-07-01" @default.
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- W100688064 title "Effect of hydralazine in spontaneous tumours assessed by oxygen electrodes and 31P-magnetic resonance spectroscopy." @default.
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