Pharmacological modifications of the partial pressure of oxygen in murine tumors: evaluation using in vivo EPR oximetry.
Gallez B, Jordan BF, Baudelet C, Misson PD
Laboratory of Medicinal Chemistry and Radiopharmacy, Universite Catholique de Louvain, Brussels, Belgium. Gallez@cmfa.ucl.ac.be
EPR oximetry using an implantable paramagnetic probe was used to quantify
the partial pressure of oxygen (pO(2)) in tissues in a transplantable mouse
tumor model (TLT) after administration of 34 different vasodilators belonging
to one of the following classes: angiotensin-converting enzyme inhibitors,
calcium antagonists, alpha antagonists, potassium channel openers, beta-blockers,
NO donors, and peripheral vasoactive agents. Twenty-four compounds were
efficient in significantly increasing the local pO(2) in a majority of
tumors. The increase of local pO(2) using pharmacological treatments was
lower than that achieved by using oxygen or carbogen breathing. This technique
offers an unprecedented tool for rapidly and accurately measuring treatment-induced
modifications of pO(2) in tumors. Magn Reson Med 42:627-630, 1999. Copyright
1999 Wiley-Liss, Inc.
PMID: 10502749, UI: 99434168