Heparin and Low Molecular Weight Heparin Decrease Nitric Oxide Production by Human Polymorphonuclear Cells

Background n and heparin derivatives with low anticoagulant activity exhibit a wide spectrum of biological functions affecting adhesion, activation and trafficking of leukocytes. s estigated the in vitro effect of heparin and a low molecular weight heparin derivative (LMWH) on nitric oxide (NO) production by human polymorphonuclear leukocytes (PMN). s yl-methionyl-leucyl-phenylalanine (fMLP)-stimulated NO production was significantly decreased by heparin at doses of 0.5 and 5 μg/mL, while LMWH was only effective at doses of 50 and 200 μg/mL by means of a mechanism not related to NO synthase (NOS) activity. sions results support the hypothesis that heparin and LMWH derivatives may offer therapeutic benefit for inflammatory diseases where NO plays a protagonic role.