title: An in vitro study on the modulation of the neutrophil adhesive behavior by soluble fibrinogen.
abstract: Fibrinogen constitutes an important plasma glycoprotein involved in hemostasis and in inflammation. Previously, we have shown that at physiological concentrations, soluble fibrinogen is able to modulate the pattern of neutrophil activation. This led us to propose that under these conditions, fibrinogen could as well interfere with the adhesive behaviour of circulating neutrophils which is of utmost importance in their recruitment to the vascular wall during inflammatory processes. To address our working hypothesis, in vitro adhesion assays were here performed in a flow chamber by using primary cultures of human umbilical vein endothelial cells (HUVEC) and neutrophils isolated from peripheral venous blood of healthy human donors. In the presence of a physiological concentration of soluble fibrinogen (300 mg/dL), we observed that despite the number of neutrophils rolling on an activated endothelium was not affected, their rolling velocity was increased in comparison to that of non-activated neutrophils. Consequently as expected, the number of fibrinogen-treated neutrophils adhering to activated HUVEC monolayers was significantly diminished. Overall, we have here demonstrated that at least in vitro, soluble fibrinogen under physiological concentrations is able to modulate the interaction of neutrophils with the vascular endothelium. In vivo studies will enable us in the future to study the physiological relevance of these findings and further to understand the mechanisms underlying this function.
authors.affiliation: Unidade de Biologia Microvascular e Inflamação, Instituto de Medicina Molecular, Instituto de Bioquímica, Faculdade de Medicina, Universidade de Lisboa, Portugal.
authors.forename: V Vitorino
authors.initials: VV
authors.lastname: de Almeida
authors.affiliation: Unidade de Biologia Microvascular e Inflamação, Instituto de Medicina Molecular, Instituto de Bioquímica, Faculdade de Medicina, Universidade de Lisboa, Portugal.
authors.forename: A
authors.initials: A
authors.lastname: Calado
authors.affiliation: Unidade de Biologia Microvascular e Inflamação, Instituto de Medicina Molecular, Instituto de Bioquímica, Faculdade de Medicina, Universidade de Lisboa, Portugal.
authors.forename: A S
authors.initials: AS
authors.lastname: Silva-Herdade
authors.affiliation: Unidade de Biologia Microvascular e Inflamação, Instituto de Medicina Molecular, Instituto de Bioquímica, Faculdade de Medicina, Universidade de Lisboa, Portugal.
authors.forename: H S
authors.initials: HS
authors.lastname: Rosário
authors.affiliation: Unidade de Biologia Microvascular e Inflamação, Instituto de Medicina Molecular, Instituto de Bioquímica, Faculdade de Medicina, Universidade de Lisboa, Portugal.
authors.forename: C
authors.initials: C
authors.lastname: Saldanha
mesh_terms: D002448:Cell Adhesion / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D005340:Fibrinogen / Q000494:pharmacology; D005434:Flow Cytometry; D061307:Human Umbilical Vein Endothelial Cells; D006801:Humans; D018375:Neutrophil Activation / Q000187:drug effects; D009504:Neutrophils / Q000737:chemistry / Q000166:cytology* / Q000187:drug effects; D011485:Protein Binding
chemical_list: D005340:Fibrinogen