NCIt definition : An amino acid derivative and nitric oxide synthase (NOS) inhibitor with potential
antineoplastic and antiangiogenic activities. Upon administration, NG-nitro-L-arginine
inhibits the enzyme nitric oxide synthase, thereby preventing the formation of nitric
oxide (NO). By preventing NO generation, the vasodilatory effects of NO are abrogated
leading to vasoconstriction, reduction in vascular permeability and an inhibition
of angiogenesis. As blood flow to tumors is restricted, this may result in an inhibition
of tumor cell proliferation. NO plays an important role in tumor blood flow and stimulation
of angiogenesis, tumor progression, survival, migration and invasiveness.;