title: Guinea pig blood: a model for the pharmacologic modulation of the GPIb/IX-vWF axis.
abstract: Antithrombotic activity of two recombinant GPIb-binding fragments of vWF, RG12986 (residues 445-733), and VCL (residues 504-728), were assessed in an ex vivo capillary perfusion chamber exposing human type III collagen to native nonanticoagulated guinea pig blood. Platelet adhesion and thrombus formation were evaluated by computer assisted morphometry for two shear rates (650 and 1800 s-1) and for two perfusion times (1.5 and 4 min). At 1800 s-1 and 4 min of perfusion, platelet adhesion decreased from 63 +/- 7% for control, to 46 +/- 4% for 20 mg/kg RG12986, and to 29 +/- 5% for 4 mg/kg VCL, and the mean thrombus height dropped from 40 +/- 8 microns to 24 +/- 3 microns and 7.5 +/- 1 microns, respectively. The two doses did not change bleeding time values. Our results suggest that guinea pig blood and the circular perfusion chamber represent a good model for the evaluation of limited amount of GPIb/IX-vWF axis inhibitors.
authors.affiliation: INSERM U353, Paris, France.
authors.forename: P
authors.initials: P
authors.lastname: André
authors.forename: P
authors.initials: P
authors.lastname: Hamaud
authors.forename: C
authors.initials: C
authors.lastname: Bal dit Sollier
authors.forename: V
authors.initials: V
authors.lastname: Drouet
authors.forename: L I
authors.initials: LI
authors.lastname: Garfinkel
authors.forename: A
authors.initials: A
authors.lastname: Uzan
authors.forename: J P
authors.initials: JP
authors.lastname: Caen
authors.forename: L O
authors.initials: LO
authors.lastname: Drouet
mesh_terms: D000818:Animals; D005343:Fibrinolytic Agents / Q000737:chemistry / Q000494:pharmacology; D006168:Guinea Pigs; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D010446:Peptide Fragments / Q000494:pharmacology*; D010973:Platelet Adhesiveness / Q000187:drug effects*; D010974:Platelet Aggregation / Q000187:drug effects*; D019038:Platelet Glycoprotein GPIb-IX Complex / Q000378:metabolism*; D011994:Recombinant Proteins / Q000737:chemistry / Q000494:pharmacology; D014841:von Willebrand Factor / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D005343:Fibrinolytic Agents; D010446:Peptide Fragments; D019038:Platelet Glycoprotein GPIb-IX Complex; D011994:Recombinant Proteins; D014841:von Willebrand Factor