The potential for prazosin and calcitonin gene-related peptide (CGRP) in causing hypoxia in tumours

Using 31P NMR spectroscopy, changes in tumour metabolic status were studied in a transplanted rat fibrosarcoma following the administration of vasodilators. Mean Arterial Blood Pressure (MABP) was monitored simultaneously. Two vasodilators were studied, prazosin and CGRP, which altered the NMR param...

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Bibliographic Details
Published in:	British journal of cancer Vol. 64; no. 4; pp. 683 - 688
Main Authors:	BURNEY, I. A, MAWXELL, R. J, GRIFFITHS, J. R, FIELD, S. B
Format:	Journal Article
Language:	English
Published:	Basingstoke Nature Publishing Group 01-10-1991
Subjects:	Animals Biological and medical sciences Blood Pressure - drug effects Calcitonin Gene-Related Peptide - pharmacology Cardiovascular system Cell Hypoxia - drug effects Fibrosarcoma - blood supply Magnetic Resonance Spectroscopy Medical sciences Pharmacology. Drug treatments Phosphorus Prazosin - pharmacology Rats Vasodilator agents. Cerebral vasodilators Vasodilator agent Rat Pathogenesis Rodentia Exploration Fibrosarcoma NMR spectrometry Malignant tumor Heterotransplantation Metabolism Calcitonine gene related peptide Vertebrata Chemotherapy Experimental disease Mammalia Treatment Animal Calcitonin Hypoxia Hemodynamics
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Summary:	Using 31P NMR spectroscopy, changes in tumour metabolic status were studied in a transplanted rat fibrosarcoma following the administration of vasodilators. Mean Arterial Blood Pressure (MABP) was monitored simultaneously. Two vasodilators were studied, prazosin and CGRP, which altered the NMR parameters Pi/sigma P, beta NTP,Pi, PCr/Pi and PME/Pi in a dose dependent manner. There was a good correlation between the various NMR parameters; for analysis, Pi/sigma P was used for convenience. With increasing doses of vasodilator, Pi/sigma P increased and the MABP decreased. Reduction in pHNMR showed a correlation with decreasing MABP following the administration of prazosin but not after CGRP. Both prazosin and CGRP produced changes in 31P NMR spectra consistent with a reduction in tumour blood flow. The results for prazosin and CGRP were comparable and showed a 15-20% increase in Pi/sigma P for a 20% reduction in MABP. These results were compared with those from hydralazine. With hydralazine an acceptable reduction in blood pressure (up to approximately 25%) has little effect and may even alter NMR parameters consistent with an increase in blood flow, a reduction of approximately 40% is required for a significant decrease in flow. Both prazosin and CGRP are shown to be far more effective than hydralazine in causing tumour hypoxia at a clinically acceptable reduction in blood pressure. CGRP may be the more suitable for clinical use because of its short half life, its capability to achieve controlled hypotension and the relatively few side effects associated with its use.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0007-0920 1532-1827
DOI:	10.1038/bjc.1991.381