Identification and characterization of endothelial glycoprotein Ib using viper venom proteins modulating cell adhesion.

Abstract:

:The expression and function of a glycoprotein Ib (GPIb) complex on human umbilical vein endothelial cells (HUVECs) is still a matter of controversy. We characterized HUVEC GPIb using viper venom proteins: alboaggregins A and B, echicetin, botrocetin, and echistatin. Echicetin is an antagonist, and alboaggregins act as agonists of the platelet GPIb complex. Botrocetin is a venom protein that alters von Willebrand factor (vWF) conformation and increases its binding affinity for the GPIb complex. Echistatin is a disintegrin that blocks alphavbeta3. Echistatin, but not echicetin, inhibited the adhesion to vWF of Chinese hamster ovary (CHO) cells transfected with alphavbeta3. We found the following: (1) Binding of monoclonal antibodies against GPIbalpha to HUVECs was moderately increased after stimulation with cytokines and phorbol ester. Echicetin demonstrated an inhibitory effect. (2) Both echicetin and echistatin, an alphavbeta3 antagonist, inhibited the adhesion of HUVECs to immobilized vWF in a dose-dependent manner. The inhibitory effect was additive when both proteins were used together. (3) Botrocetin potentiated the adhesion of HUVECs to vWF, and this effect was completely abolished by echicetin, but not by echistatin. (4) CHO cells expressing GPIbalphabeta/IX adhered to vWF (in the presence of botrocetin) and to alboaggregins; GPIbalpha was required for this reaction. Echicetin, but not echistatin, inhibited the adhesion of cells transfected with GPIbalphabeta/IX to immobilized vWF. (5) HUVECs adhered strongly to immobilized vWF and alboaggregins with extensive spreading, which was inhibited by LJ1b1, a monoclonal antibody against GPIb. The purified alphavbeta3 receptor did not interact with the alboaggregins, thereby excluding the contribution of alphavbeta3 in inducing HUVEC spreading on alboaggregins. In conclusion, our data confirm the presence of a functional GPIb complex expressed on HUVECs in low density. This complex may mediate HUVEC adhesion and spreading on immobilized vWF and alboaggregins.

journal_name

Blood

journal_title

Blood

authors

Tan L,Kowalska MA,Romo GM,Lopez JA,Darzynkiewicz Z,Niewiarowski S

subject

Has Abstract

pub_date

1999-04-15 00:00:00

pages

2605-16

issue

8

eissn

0006-4971

issn

1528-0020

journal_volume

93

pub_type

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