Parkins, C.S., Holder, A.L., Hill, S.A. et al. (2 more authors) (2000) Determinants of anti-vascular action by combretastatin A-4 phosphate: role of nitric oxide. British Journal of Cancer, 83 (6). pp. 811-816. ISSN 0007-0920
Abstract
The anti-vascular action of the tubulin binding agent combretastatin A-4 phosphate (CA-4-P) has been quantified in two types of murine tumour, the breast adenocarcinoma CaNT and the round cell sarcoma SaS. The functional vascular volume, assessed using a fluorescent carbocyanine dye, was significantly reduced at 18 h after CA-4-P treatment in both tumour types, although the degree of reduction was very different in the two tumours. The SaS tumour, which has a higher nitric oxide synthase (NOS) activity than the CaNT tumour, showed ~10-fold greater resistance to vascular damage by CA-4-P. This is consistent with our previous findings, which showed that NO exerts a protective action against this drug. Simultaneous administration of CA-4-P with a NOS inhibitor, Nω-nitro-L-arginine (L-NNA), resulted in enhanced vascular damage and cytotoxicity in both tumour types. Administration of diethylamine NO, an NO donor, conferred protection against the vascular damaging effects. Following treatment with CA-4-P, neutrophil infiltration into the tumours, measured by myeloperoxidase (MPO) activity, was significantly increased. Levels of MPO activity also correlated with the levels of vascular injury and cytotoxicity measured in both tumour types. Neutrophilic MPO generates free radicals and may therefore contribute to the vascular damage associated with CA-4-P treatment. MPO activity was significantly increased in the presence of L-NNA, suggesting that the protective effect of NO against CA-4-P-induced vascular injury may be, at least partially, mediated by limiting neutrophil infiltration. The data are consistent with the hypothesis that neutrophil action contributes to vascular injury by CA-4-P and that NO generation acts to protect the tumour vasculature against CA4-P-induced injury. The protective effect of NO is probably associated with an anti-neutrophil action.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2000, Cancer Research Campaign. From twelve months after its original publication, this work is licensed under the Creative Commons Attribution-NonCommercial-Share Alike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Keywords: | combretastatin A-4 phosphate; vasculature; nitric oxide; neutrophil; SOLID TUMOR-THERAPY; ISCHEMIA-REPERFUSION INJURY; DEPENDENT MECHANISM; NORMAL-TISSUES; MURINE TUMORS; TUBULIN; MYELOPEROXIDASE; AGENTS; TOXICITY; RADICALS |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > The Medical School (Sheffield) > Division of Genomic Medicine (Sheffield) > Department of Oncology and Metabolism (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 18 May 2017 09:23 |
Last Modified: | 18 May 2017 09:23 |
Published Version: | https://doi.org/10.1054/bjoc.2000.1361 |
Status: | Published |
Publisher: | Cancer Research UK |
Refereed: | Yes |
Identification Number: | 10.1054/bjoc.2000.1361 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:115374 |
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