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AMG531 stimulates megakaryopoiesis in vitro by binding to Mpl.

Abstract：

:Thrombopoietin (TPO) plays a pivotal role in megakaryopoiesis. TPO initiates its biological effects by binding to its receptor Mpl. A recombinant protein consisting of a carrier Fc domain linked to multiple Mpl-binding domains was constructed, and is called AMG531. To define the biological activity of AMG531, we examined the ability of AMG531 to support CFU-Meg growth and to promote megakaryocyte maturation in vitro. AMG531 stimulates CFU-Meg growth in a dose-dependent manner, and acts in concert with erythropoietin, stem cell factor, interleukin-3, and interleukin-6 to enhance CFU-Meg growth, similar to parallel experiments with TPO. AMG531-stimulated serum-free liquid cultures support the development of mature polyploid megakaryocytes with a predominant DNA content of 32 N and 64 N, identical to that of parallel TPO-stimulated cultures. Competitive binding experiments show that AMG531 effectively competes with 125I-TPO for binding to BaF3-Mpl cells or normal platelets. Treatment of BaF3-Mpl cells with AMG531 or with TPO resulted in rapid tyrosine phosphorylation of Mpl, JAK2, and STAT5. These results indicate that AMG531 is a potent stimulant of megakarypoiesis in vitro, and provide support for its further characterization in vivo.

journal_name

Cytokine

journal_title

Cytokine

authors

Broudy VC,Lin NL

doi

10.1016/j.cyto.2003.05.001

keywords:

subject

Has Abstract

pub_date

2004-01-21 00:00:00

pages

52-60

issue

2

eissn

1043-4666

issn

1096-0023

pii

S1043466603003235

journal_volume

25

pub_type

杂志文章

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