Porcine platelet von Willebrand antigen II (vW AgII): inhibitory effect on collagen-induced aggregation and comparative distribution with human platelets.

Abstract:

:Von Willebrand factor (vWF) is synthesized by human endothelial cells and megakaryocytes as a large precursor, the pre-provWF, which is finally cleaved into the propolypeptide of vWF (pp-vWF) and the mature vWF. We have purified in parallel the pp-vWF and the GP IIb-IIIa from porcine platelets. The N-terminus comparative analysis of porcine pp-vWF with respect to other species revealed more than a 75% and 65% homology with the bovine and human pp-vWF, respectively. Purified pp-vWF inhibited collagen-induced platelet aggregation in porcine platelet rich plasma (PRP) and specifically binds to collagen. Polyclonal antibody pabBp19 against the purified protein was prepared and characterized by ELISA, Western-blot and immunocytochemistry. The distribution of pp-vWF in soluble and membrane fractions from pig platelets has been performed by immunolabeling detection. pabBp19 did not blot human platelet lysates but human pp-vWF was detectable using the antibody Frieda 013091. Cell distribution and quantification studies of human and porcine platelet pp-vWF showed that the protein exists in the soluble and membrane fractions and its pattern is similar in both species.

journal_name

Thromb Haemost

authors

Royo T,Vidal M,Badimon L

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

677-85

issue

4

eissn

0340-6245

issn

2567-689X

pii

98100677

journal_volume

80

pub_type

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