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. 1991 Nov;104(3):633–638. doi: 10.1111/j.1476-5381.1991.tb12481.x

Nitric oxide from vascular smooth muscle cells: regulation of platelet reactivity and smooth muscle cell guanylate cyclase.

V Mollace 1, D Salvemini 1, E Anggard 1, J Vane 1
PMCID: PMC1908252  PMID: 1724627

Abstract

1. Incubation of smooth muscle cells (SMC) from bovine aorta for 3 min with human washed platelets treated with indomethacin (10 microM) promoted a cell number-related inhibition of platelet aggregation induced by thrombin (40 mu ml-1). This inhibition was not attributable to products of the cyclo-oxygenase pathway for the SMC were also treated with indomethacin (10 microM). 2. The inhibitory activity of the SMC on platelet aggregation was enhanced by incubating the SMC with E. coli lipopolysaccharide (LPS, 0.5 micrograms ml-1) for a period of 9 to 24 h. This effect was attenuated when cycloheximide (10 micrograms ml-1) was incubated together with LPS. Cycloheximide did not prevent the inhibitory activity of the non-treated cells. 3. The inhibition of platelet aggregation obtained with non-treated or LPS-treated SMC was potentiated by superoxide dismutase (SOD, 60 u ml-1) and ablated by oxyhaemoglobin (OxyHb, 10 microM). Preincubation of the SMC with NG-monomethyl-L-arginine (L-NMMA, 30-300 microM) for 60 min prevented their antiaggregatory activity. This effect was reversed by concurrent incubation with L-arginine (L-Arg, 100 microM) but not with D-arginine (D-Arg, 100 microM). 4. Exposure of the non-treated SMC (5 x 10(5) cells) to stirring (1000 r.p.m., 37 degrees C) for 10 min led to a significant increase in their levels of guanosine 3':5'-cyclic monophosphate (cyclic GMP) but not adenosine 3':5'-cyclic monophosphate (cyclic AMP). L-NMMA (300 microM) attenuated the increase in cyclic GMP induced by stirring but did not affect the basal levels of cyclic GMP in the cells.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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