Article (Scientific journals)
Endothelin-1 is a critical mediator of myogenic tone in tumor arterioles: implications for cancer treatment.
Sonveaux, Pierre; Dessy; MARTINIVE, Philippe et al.
2004In Cancer Research, 1 (64), p. 3209-14
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Keywords :
endocrine; radiotherapy; tumor arterioles; endohtelin
Abstract :
[en] Although derived from the host tissue, the tumor vasculature is under the influence of the tumor microenvironment and needs to adapt to the resistance to blood flow inherent to the dynamics of tumor growth. Such vascular remodeling can offer selective targets to pharmacologically modulate tumor perfusion and thereby improve the efficacy of conventional anticancer treatments. Radiotherapy and chemotherapy can, indeed, take advantage of a better tumor oxygenation and drug delivery, respectively, both partly dependent on the tumor blood supply. Here, we showed that isolated tumor arterioles mounted in a pressure myograph have the ability, contrary to size-matched healthy arterioles, to contract in response to a transluminal pressure increase. This myogenic tone was exquisitely dependent on the endothelin-1 pathway because it was completely abolished by the selective endothelin receptor A (ETA) antagonist BQ123. This selectivity was additionally supported by the large increase in endothelin-1 abundance in tumors and the higher density of the ETA receptors in tumor vessels. We also documented by using laser Doppler microprobes and imaging that administration of the ETA antagonist led to a significant increase in tumor blood flow, whereas the perfusion in control healthy tissue was not altered. Finally, we provided evidence that acute administration of the ETA antagonist could significantly stimulate tumor oxygenation, as determined by electron paramagnetic resonance oximetry, and increase the efficacy of low-dose, clinically relevant fractionated radiotherapy. Thus, blocking the tumor-selective increase in the vascular endothelin-1/ETA pathway led us to unravel an important reserve of vasorelaxation that can be exploited to selectively increase tumor response to radiotherapy.
Disciplines :
Oncology
Author, co-author :
Sonveaux, Pierre
Dessy
MARTINIVE, Philippe ;  University of Louvain Medical School, Unit of Pharmacology and Therapeutics
Havaux, X
Jordan, B
Gallez, B
Gregoire, V
Balligand, J-L
Feron, O
Language :
English
Title :
Endothelin-1 is a critical mediator of myogenic tone in tumor arterioles: implications for cancer treatment.
Publication date :
May 2004
Journal title :
Cancer Research
ISSN :
0008-5472
eISSN :
1538-7445
Publisher :
American Association for Cancer Research, Inc. (AACR), Baltimore, United States - Maryland
Volume :
1
Issue :
64
Pages :
3209-14
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 05 August 2009

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