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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 2001 Oct;92(10):1082–1092. doi: 10.1111/j.1349-7006.2001.tb01063.x

Identification and Characterisation of a Platelet GPIb/V/IX‐like Complex on Human Breast Cancers: Implications for the Metastatic Process

Catherine M Suter 1,2, Philip J Hogg 2, John T Price 3, Beng H Chong 2, Robyn L Ward 1,4,✉
PMCID: PMC5926614  PMID: 11676859

Abstract

The glycoprotein (GP) Ib/V/IX receptor complex is an important adhesion molecule, originally thought to be unique to the megakaryocytic lineage. Recent evidence now indicates that GPIb/V/IX may be more widely expressed. In this study we report the presence of all subunits of the complex on four breast cancer cell lines, and 51/80 primary breast tumours. The surface expression of GPIb/V/IX was confirmed by flow cytometry, and by immunoprecipitation of biotin surface‐labelled tumour cells. Western blotting of cell lysates under reducing conditions revealed that tumour cell‐GPIba had a relative molecular weight of 95 kDa as compared to 135 kDa on platelets. Despite the discrepant protein size, molecular analyses on the tumour cell‐GPIba subunit using RT‐PCR and DNA sequencing revealed 100% sequence homology to platelet GPIba. Tumour cell‐GPIb/V/IX was capable of binding human von Willebrand factor (vWf), and this binding caused aggregation of tumour cells in suspension. Tumour cells bound to immobilised vWf in the presence of EDTA and demonstrated prominent filapodial extensions indicative of cytoskeletal reorganisation. Furthermore, in a modified Boyden chamber assay, prior exposure to vWf or a GPIba monoclonal antibody, AK2, enhanced cell migration. The presence of a functional GPIb/V/IX‐like complex in tumour cells suggests that this complex may participate in the process of haematogenous breast cancer metastasis

Keywords: Platelet glycoproteins, von Willebrand factor, Metastasis, Breast cancer

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