Comparative effects of combretastatin A-4 disodium phosphate and 5,6-dimethylxanthenone-4-acetic acid on blood perfusion in a murine tumour and normal tissues.
OBJECTIVE
To compare the ability of combretastatin A-4 disodium phosphate (CA4DP) and 5,6-dimethylxanthenone-4-acetic acid (DMXAA) to change tissue blood perfusion.


METHODS
The tissues were a C3H mouse mammary carcinoma and various murine normal tissues, with perfusion measured using the 86RbCl extraction technique.


RESULTS
CA4DP (250mg/kg; i.p.) reduced tumour perfusion to 34% of that seen in controls within 1 h of injection. It was maintained at this for at least 6 h, returning to control levels by 24 h. This decrease was dose-dependent. DMXAA (25mg/kg; i.p.) caused a 79% reduction in tumour perfusion 6h after injection; no recovery was observed even after 24 h. DMXAA showed no changes at doses below 10 mg/kg. Both CA4DP and DMXAA increased perfusion in the gut, kidney, bladder and lung, while decreasing splenic perfusion. CA4DP tended to decrease perfusion in muscle, while DMXAA increased liver perfusion. These changes in normal tissue perfusion were generally less than those changes seen in tumours. No significant changes were seen in skin.


CONCLUSIONS
CA4DP and DMXAA produced a selective and significant reduction in tumour perfusion, but the pattern of change was different. These results suggest how these vascular targeting drugs should be combined with more conventional therapies.
Danish Cancer Society, Department of Experimental Clinical Oncology, Aarhus University Hospital. rumi@oncology.dk
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R
Murata
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J
Overgaard
M R
MR
Horsman
D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D001769:Blood / Q000187:drug effects*; D004064:Digestive System / Q000098:blood supply; D004305:Dose-Response Relationship, Drug; D005260:Female; D007668:Kidney / Q000098:blood supply; D008099:Liver / Q000098:blood supply; D008168:Lung / Q000098:blood supply; D051379:Mice; D008809:Mice, Inbred C3H; D009132:Muscles / Q000098:blood supply; D009368:Neoplasm Transplantation; D009369:Neoplasms / Q000098:blood supply; D010477:Perfusion; D012867:Skin / Q000098:blood supply; D013154:Spleen / Q000098:blood supply; D013267:Stilbenes / Q000494:pharmacology*; D013997:Time Factors; D014018:Tissue Distribution; D014407:Tumor Cells, Cultured; D001743:Urinary Bladder / Q000098:blood supply; D014966:Xanthenes / Q000494:pharmacology*; D044004:Xanthones
D000970:Antineoplastic Agents; D000972:Antineoplastic Agents, Phytogenic; D013267:Stilbenes; D014966:Xanthenes; D044004:Xanthones; C066668:vadimezan; C058728:fosbretabulin