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Differentiation

hNUDC promotes the cell proliferation and differentiation in a leukemic cell line via activation of the thrombopoietin receptor (Mpl)

Leukemia volume 22, pages 1018–1025 (2008)Cite this article

Abstract

We have recently identified a human homolog of a fungal nuclear migration protein (hNUDC) that binds specifically with the extracellular domain of thrombopoietin receptor (Mpl). Preliminary studies with human CD34+ cells cultured in serum-free medium and normal mice showed that hNUDC appears to act as a cytokine, triggering many of the same responses as thrombopoietin (TPO). More intriguingly, recent data gained using a NIH 3T3 system have demonstrated that hNUDC exerts its biological activities through activation of Mpl. In this study, we further compared the biological functions of hNUDC with TPO in an EPO-dependent UT-7 cell line that was engineered to express the thrombopoietin receptor (Mpl). These Mpl-expressing cells following stimulation by either hNUDC or TPO exhibited overlapping patterns of megakaryocytic proliferation and differentiation, manifested by cell morphological change, polyploidy and expression of CD41+. Similar with TPO, hNUDC induced a sustained activation of the extracellular signal-regulated protein kinases-1 and -2 (ERK1/2) as well as p38 mitogen-activated kinase (p38 MAPK) pathways and these activations were inhibited in the presence of PD98059 or SB203580. Further evidence is provided that PD98059 or SB203580 inhibited hNUDC- or TPO-induced cell proliferation and differentiation, suggesting that ERK1/2 and p38 MAPK pathways are necessary in megakaryocyte development.

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Acknowledgements

This research was supported by China National Science Foundation Grant 30670769 and ‘863’ Grant 2007AA21009.

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  1. State Key Laboratory of Biocontrol and The Key Laboratory of Gene Engineering of Education Ministry, Zhongshan University, Guangzhou, People's Republic of China

    Y-S Tang, Y-P Zhang & P Xu

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  1. Y-S Tang
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Correspondence to P Xu.

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Tang, YS., Zhang, YP. & Xu, P. hNUDC promotes the cell proliferation and differentiation in a leukemic cell line via activation of the thrombopoietin receptor (Mpl). Leukemia 22, 1018–1025 (2008). https://doi.org/10.1038/leu.2008.20

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