Preclinical Activity of Eltrombopag (SB-497115), an Oral, Nonpeptide Thrombopoietin Receptor Agonist

被引：226

作者：

Erickson-Miller, Connie L. ^{[1
]}

Delorme, Evelyne ^{[2
]}

Tian, Shin-Shay ^{[2
]}

Hopson, Christopher B. ^{[1
]}

Landis, Amy J. ^{[1
]}

Valoret, Elizabeth I. ^{[1
]}

Sellers, Teresa S. ^{[3
]}

Rosen, Jon ^{[2
]}

Miller, Stephen G. ^{[2
]}

Luengo, Juan I. ^{[1
]}

Duffy, Kevin J. ^{[1
]}

Jenkins, Julian M. ^{[1
]}

机构：

[1] GlaxoSmithKline, Collegeville, PA 19426 USA

[2] Ligand Pharmaceut Inc, La Jolla, CA 92037 USA

[3] GlaxoSmithKline, King Of Prussia, PA USA

来源：

STEM CELLS | 2009年 / 27卷 / 02期

关键词：

Thrombopoietin receptor agonist; Megakaryocyte; Differentiation; Thrombocytopenia; C-MPL LIGAND; MEGAKARYOCYTE GROWTH; PLATELET PRODUCTION; THROMBOCYTOPENIA; IDENTIFICATION; STIMULATION; REGULATOR; DISCOVERY; BIOLOGY; CLONING;

D O I：

10.1634/stemcells.2008-0366

中图分类号：

Q813 [细胞工程];

学科分类号：

摘要：

Eltrombopag is a first-in-class, orally bioavailable, small-molecule, nonpeptide agonist of the thrombopoietin receptor (TpoR), which is being developed as a treatment for thrombocytopenia of various etiologies. In vitro studies have demonstrated that the activity of eltrombopag is dependent on expression of TpoR, which activates the signaling transducers and activators of transcription (STAT) and mitogen-activated protein kinase signal transduction pathways. The objective of this preclinical study is to determine if eltrombopag interacts selectively with the TpoR to facilitate megakaryocyte differentiation in platelets. Functional thrombopoietic activity was demonstrated by the proliferation and differentiation of primary human CD34(+) bone marrow cells into CD41(+) megakaryocytes. Measurements in platelets in several species indicated that eltrombopag specifically activates only the human and chimpanzee STAT pathways. The in vivo activity of eltrombopag was demonstrated by an increase of up to 100% in platelet numbers when administered orally (10 mg/kg per day for 5 days) to chimpanzees. In conclusion, eltrombopag interacts selectively with the TpoR without competing with Tpo, leading to the increased proliferation and differentiation of human bone marrow progenitor cells into megakaryocytes and increased platelet production. These results suggest that eltrombopag and Tpo may be able to act additively to increase platelet production. STEM CELLS 2009; 27: 424-430

引用

页码：424 / 430

页数：7

共 31 条

[21] NMR structural studies of interactions of a small, nonpeptidyl Tpo mimic with the thrombopoietin receptor extracellular juxtamembrane and transmembrane domains [J].