PMID: 7540036Jun 1, 1995Paper

Nitric oxide synthase inhibition irreversibly decreases perfusion in the R3230Ac rat mammary adenocarcinoma

British Journal of Cancer
R E MeyerM W Dewhirst

Abstract

We examined the microvascular effects of competitive nitric oxide synthase (NOS) inhibition with NG-monomethyl-L-arginine (MeArg), followed by L-arginine, on R3230Ac mammary adenocarcinoma perfusion. In window preparations containing tumours, superfusion of 50 microM MeArg reduced diameters of central tumour venules by 13%, of peripheral tumour venules by 17% and of normal venules near tumours by 16% from baseline. MeArg reduced red blood cell (RBC) velocity in central tumour venules by 25%, and increased intermittent flow and stasis frequency by 20% in central tumour venules. Subsequent superfusion of 200 microM L-arginine did not restore diameters or RBC velocity of any tumour preparation venules, and decreased length density in both central tumour venules and peripheral tumour venules. In contrast, MeArg reduced control preparation venule diameter by 30% and RBC velocity by 66%, but did not decrease length density or increase intermittent flow or stasis frequency. Unlike tumour preparation venules, L-arginine restored control venule diameters and velocities. NOS inhibition reduces both tumour and control venule perfusion, but the effect is blunted in the vicinity of tumours, possibly because of increased NOS levels. Perfusio...Continue Reading

Citations

Jul 1, 1996·The American Journal of Physiology·R A LindbergA R Whorton
Jan 18, 2007·The Journal of Pharmacy and Pharmacology·David Hirst, Tracy Robson
Dec 19, 2015·Nature Reviews. Drug Discovery·Csaba Szabo
May 28, 2009·Clinical Cancer Research : an Official Journal of the American Association for Cancer Research·Gillian M TozerSally A Hill
Jun 30, 2011·Molecular Cancer Therapeutics·Frederick W FlitneySimon P Fricker
Jan 5, 2002·International Journal of Radiation Oncology, Biology, Physics·Hiroshi Inano, Makoto Onoda
Aug 26, 2000·European Journal of Cancer : Official Journal for European Organization for Research and Treatment of Cancer (EORTC) [and] European Association for Cancer Research (EACR)·G U Dachs, G M Tozer
Mar 7, 2003·Nitric Oxide : Biology and Chemistry·Hiroshi Inano, Makoto Onoda
Jan 1, 1997·Clinical Oncology : a Journal of the Royal College of Radiologists·G M Tozer, S A Everett
Jun 20, 1998·Seminars in Radiation Oncology·D J ChaplinG M Tozer

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