Rhodocytin (aggretin) activates platelets lacking alpha(2)beta(1) integrin, glycoprotein VI, and the ligand-binding domain of glycoprotein Ibalpha.

W Bergmeier; D Bouvard; J A Eble; R Mokhtari-Nejad; V Schulte; H Zirngibl; C Brakebusch; R Fässler; B Nieswandt

doi:10.1074/jbc.M103892200

Rhodocytin (aggretin) activates platelets lacking alpha(2)beta(1) integrin, glycoprotein VI, and the ligand-binding domain of glycoprotein Ibalpha.

W Bergmeier, D Bouvard, J A Eble, R Mokhtari-Nejad, V Schulte, H Zirngibl, C Brakebusch, R Fässler, B Nieswandt

Biomedicinsk Institut

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

75 Citationer (Scopus)

Abstract

Udgivelsesdato: 2001-Jul-6

Originalsprog	Engelsk
Tidsskrift	Journal of Biological Chemistry
Vol/bind	276
Udgave nummer	27
Sider (fra-til)	25121-6
Antal sider	5
ISSN	0021-9258
DOI	https://doi.org/10.1074/jbc.M103892200
Status	Udgivet - 2001

Bibliografisk note

Keywords: Animals; Binding Sites; Flow Cytometry; Integrins; Lectins; Lectins, C-Type; Ligands; Mice; Molecular Weight; Platelet Aggregation; Platelet Glycoprotein GPIb-IX Complex; Platelet Membrane Glycoproteins; Receptors, Collagen; Viper Venoms

Adgang til dokumentet

10.1074/jbc.M103892200

Citationsformater

Bergmeier, W., Bouvard, D., Eble, J. A., Mokhtari-Nejad, R., Schulte, V., Zirngibl, H., Brakebusch, C., Fässler, R., & Nieswandt, B. (2001). Rhodocytin (aggretin) activates platelets lacking alpha(2)beta(1) integrin, glycoprotein VI, and the ligand-binding domain of glycoprotein Ibalpha. Journal of Biological Chemistry, 276(27), 25121-6. https://doi.org/10.1074/jbc.M103892200

Bergmeier, W, Bouvard, D, Eble, JA, Mokhtari-Nejad, R, Schulte, V, Zirngibl, H, Brakebusch, C, Fässler, R & Nieswandt, B 2001, 'Rhodocytin (aggretin) activates platelets lacking alpha(2)beta(1) integrin, glycoprotein VI, and the ligand-binding domain of glycoprotein Ibalpha.', Journal of Biological Chemistry, bind 276, nr. 27, s. 25121-6. https://doi.org/10.1074/jbc.M103892200

@article{d0455c30589911dd8d9f000ea68e967b,

title = "Rhodocytin (aggretin) activates platelets lacking alpha(2)beta(1) integrin, glycoprotein VI, and the ligand-binding domain of glycoprotein Ibalpha.",

abstract = "Although alpha(2)beta(1) integrin (glycoprotein Ia/IIa) has been established as a platelet collagen receptor, its role in collagen-induced platelet activation has been controversial. Recently, it has been demonstrated that rhodocytin (also termed aggretin), a snake venom toxin purified from the venom of Calloselasma rhodostoma, induces platelet activation that can be blocked by monoclonal antibodies against alpha(2)beta(1) integrin. This finding suggested that clustering of alpha(2)beta(1) integrin by rhodocytin is sufficient to induce platelet activation and led to the hypothesis that collagen may activate platelets by a similar mechanism. In contrast to these findings, we provided evidence that rhodocytin does not bind to alpha(2)beta(1) integrin. Here we show that the Cre/loxP-mediated loss of beta(1) integrin on mouse platelets has no effect on rhodocytin-induced platelet activation, excluding an essential role of alpha(2)beta(1) integrin in this process. Furthermore, proteolytic cleavage of the 45-kDa N-terminal domain of glycoprotein (GP) Ibalpha either on normal or on beta(1)-null platelets had no significant effect on rhodocytin-induced platelet activation. Moreover, mouse platelets lacking both alpha(2)beta(1) integrin and the activating collagen receptor GPVI responded normally to rhodocytin. Finally, even after additional proteolytic removal of the 45-kDa N-terminal domain of GPIbalpha rhodocytin induced aggregation of these platelets. These results demonstrate that rhodocytin induces platelet activation by mechanisms that are fundamentally different from those induced by collagen.",

author = "W Bergmeier and D Bouvard and Eble, {J A} and R Mokhtari-Nejad and V Schulte and H Zirngibl and C Brakebusch and R F{\"a}ssler and B Nieswandt",

note = "Keywords: Animals; Binding Sites; Flow Cytometry; Integrins; Lectins; Lectins, C-Type; Ligands; Mice; Molecular Weight; Platelet Aggregation; Platelet Glycoprotein GPIb-IX Complex; Platelet Membrane Glycoproteins; Receptors, Collagen; Viper Venoms",

year = "2001",

doi = "10.1074/jbc.M103892200",

language = "English",

volume = "276",

pages = "25121--6",

journal = "Journal of Biological Chemistry",

issn = "0021-9258",

publisher = "American Society for Biochemistry and Molecular Biology, Inc.",

number = "27",

}

TY - JOUR

T1 - Rhodocytin (aggretin) activates platelets lacking alpha(2)beta(1) integrin, glycoprotein VI, and the ligand-binding domain of glycoprotein Ibalpha.

AU - Bergmeier, W

AU - Bouvard, D

AU - Eble, J A

AU - Mokhtari-Nejad, R

AU - Schulte, V

AU - Zirngibl, H

AU - Brakebusch, C

AU - Fässler, R

AU - Nieswandt, B

N1 - Keywords: Animals; Binding Sites; Flow Cytometry; Integrins; Lectins; Lectins, C-Type; Ligands; Mice; Molecular Weight; Platelet Aggregation; Platelet Glycoprotein GPIb-IX Complex; Platelet Membrane Glycoproteins; Receptors, Collagen; Viper Venoms

PY - 2001

Y1 - 2001

N2 - Although alpha(2)beta(1) integrin (glycoprotein Ia/IIa) has been established as a platelet collagen receptor, its role in collagen-induced platelet activation has been controversial. Recently, it has been demonstrated that rhodocytin (also termed aggretin), a snake venom toxin purified from the venom of Calloselasma rhodostoma, induces platelet activation that can be blocked by monoclonal antibodies against alpha(2)beta(1) integrin. This finding suggested that clustering of alpha(2)beta(1) integrin by rhodocytin is sufficient to induce platelet activation and led to the hypothesis that collagen may activate platelets by a similar mechanism. In contrast to these findings, we provided evidence that rhodocytin does not bind to alpha(2)beta(1) integrin. Here we show that the Cre/loxP-mediated loss of beta(1) integrin on mouse platelets has no effect on rhodocytin-induced platelet activation, excluding an essential role of alpha(2)beta(1) integrin in this process. Furthermore, proteolytic cleavage of the 45-kDa N-terminal domain of glycoprotein (GP) Ibalpha either on normal or on beta(1)-null platelets had no significant effect on rhodocytin-induced platelet activation. Moreover, mouse platelets lacking both alpha(2)beta(1) integrin and the activating collagen receptor GPVI responded normally to rhodocytin. Finally, even after additional proteolytic removal of the 45-kDa N-terminal domain of GPIbalpha rhodocytin induced aggregation of these platelets. These results demonstrate that rhodocytin induces platelet activation by mechanisms that are fundamentally different from those induced by collagen.

AB - Although alpha(2)beta(1) integrin (glycoprotein Ia/IIa) has been established as a platelet collagen receptor, its role in collagen-induced platelet activation has been controversial. Recently, it has been demonstrated that rhodocytin (also termed aggretin), a snake venom toxin purified from the venom of Calloselasma rhodostoma, induces platelet activation that can be blocked by monoclonal antibodies against alpha(2)beta(1) integrin. This finding suggested that clustering of alpha(2)beta(1) integrin by rhodocytin is sufficient to induce platelet activation and led to the hypothesis that collagen may activate platelets by a similar mechanism. In contrast to these findings, we provided evidence that rhodocytin does not bind to alpha(2)beta(1) integrin. Here we show that the Cre/loxP-mediated loss of beta(1) integrin on mouse platelets has no effect on rhodocytin-induced platelet activation, excluding an essential role of alpha(2)beta(1) integrin in this process. Furthermore, proteolytic cleavage of the 45-kDa N-terminal domain of glycoprotein (GP) Ibalpha either on normal or on beta(1)-null platelets had no significant effect on rhodocytin-induced platelet activation. Moreover, mouse platelets lacking both alpha(2)beta(1) integrin and the activating collagen receptor GPVI responded normally to rhodocytin. Finally, even after additional proteolytic removal of the 45-kDa N-terminal domain of GPIbalpha rhodocytin induced aggregation of these platelets. These results demonstrate that rhodocytin induces platelet activation by mechanisms that are fundamentally different from those induced by collagen.

U2 - 10.1074/jbc.M103892200

DO - 10.1074/jbc.M103892200

M3 - Journal article

C2 - 11352922

SN - 0021-9258

VL - 276

SP - 25121

EP - 25126

JO - Journal of Biological Chemistry

JF - Journal of Biological Chemistry

IS - 27

ER -