title: Nitric oxide inhibits neutrophil migration by a mechanism dependent on ICAM-1: role of soluble guanylate cyclase.
abstract: In the present study, we addressed the role of intercellular adhesion molecule type 1 (ICAM-1/CD54) in neutrophil migration to inflammatory site and whether the inhibitory effect of nitric oxide (NO) upon the neutrophil rolling, adhesion and migration involves down-modulation of ICAM-1 expression through a cyclic GMP (cGMP) dependent mechanism. It was observed that neutrophil migration induced by intraperitoneal administration of endotoxin (LPS), carrageenan (Cg) or N-formyl peptide (fMLP) in ICAM-1 deficient (ICAM-1-/-) is similar to that observed in wild type (WT) mice. The treatment of mice with NO synthase (NOS) inhibitors, NG-nitro-l-arginine, aminoguanidine or with a soluble guanylate cyclase (sGC) inhibitor, ODQ enhanced LPS- or Cg-induced neutrophil migration, rolling and adhesion on venular endothelium. These parameters induced by LPS were also enhanced by 1400 W, a specific iNOS inhibitor, treatment. On the other hand, the treatment of the mice with S-nitroso-N-acetylpenicillamine (SNAP), an NO donor, reduced these parameters induced by LPS or Cg by a mechanism sensitive to ODQ pretreatment. The NOS inhibitors did not enhance LPS-, Cg- or fMLP-induced migration and adhesion in ICAM-1-/- mice. Moreover, genetic (iNOS-/- mice) or pharmacological inhibition of NOS or of sGC enhanced LPS-induced ICAM-1 expression on mesenteric microcirculation vessels of WT mice. By contrast, SNAP reduced the ICAM-1 expression by a mechanism dependent on cGMP. In conclusion, the results suggest that although during inflammation, ICAM-1 does not contribute to neutrophil migration, it is necessary for the down-modulatory effect of inflammation-released NO on the adhesion and transmigration of neutrophils. Moreover, these NO effects are mediated via cGMP.
authors.affiliation: Department of Pharmacology, School of Medicine of Ribeirão Preto, University of São Paulo, Avenida Bandeirantes, 3900, 14049-900-Ribeirão Preto, São Paulo, Brazil.
authors.forename: Daniela
authors.initials: D
authors.lastname: Dal Secco
authors.forename: Ana P
authors.initials: AP
authors.lastname: Moreira
authors.forename: Andressa
authors.initials: A
authors.lastname: Freitas
authors.forename: João S
authors.initials: JS
authors.lastname: Silva
authors.forename: Marcos A
authors.initials: MA
authors.lastname: Rossi
authors.forename: Sérgio H
authors.initials: SH
authors.lastname: Ferreira
authors.forename: Fernando Q
authors.initials: FQ
authors.lastname: Cunha
mesh_terms: D000818:Animals; D002351:Carrageenan / Q000494:pharmacology; D002448:Cell Adhesion / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects*; D006162:Guanylate Cyclase / Q000037:antagonists & inhibitors / Q000378:metabolism; D018799:Intercellular Adhesion Molecule-1 / Q000235:genetics / Q000502:physiology*; D036904:Leukocyte Rolling / Q000187:drug effects; D008070:Lipopolysaccharides / Q000494:pharmacology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000166:cytology* / Q000187:drug effects; D009569:Nitric Oxide / Q000378:metabolism*; D020030:Nitric Oxide Donors / Q000494:pharmacology; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors / Q000378:metabolism; D026423:S-Nitroso-N-Acetylpenicillamine / Q000494:pharmacology; D013152:Splanchnic Circulation / Q000187:drug effects
chemical_list: C090509:Icam1 protein, mouse; D008070:Lipopolysaccharides; D020030:Nitric Oxide Donors; D018799:Intercellular Adhesion Molecule-1; D009569:Nitric Oxide; D009240:N-Formylmethionine Leucyl-Phenylalanine; D026423:S-Nitroso-N-Acetylpenicillamine; D002351:Carrageenan; D019001:Nitric Oxide Synthase; D006162:Guanylate Cyclase