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Enhanced thrombopoietin but not G-CSF receptor stimulation induces self-renewing hematopoietic stem cell divisions in vivo

June 24 2016

Hitoshi Takizawa

Paper information

Kovtonyuk LV, Markus G. Manz, Takizawa H.

Enhanced thrombopoietin but not G-CSF receptor stimulation induces self-renewing hematopoietic stem cell divisions in vivo.

Blood  2016 127:3175-3179; doi:10.1182/blood-2015-09-669929 

 

Highlights

Thrombopoietin receptor agnoist but not G-CSF induces self-renewing HSC divisions and expansion.

 

Abstract

In steady-state adult hematopoiesis, most hematopoietic stem cells (HSCs) are in G0 phase of the cell cycle. Upon enhanced hematopoietic demand, HSCs can be induced to divide and self-renew or differentiate. However, the cell-extrinsic signals inducing HSC cycling remain to be elucidated. Using in vivo high-resolution single HSC divisional tracking, we here directly demonstrate that clinically applied thrombopoietin receptor but not granulocyte-colony stimulating factor receptor agonists drive HSCs into self-renewing divisions leading to quantitative expansion of functional HSC as defined by their in vivo serial multi-lineage and long-term repopulating potential. These results suggest that thrombopoietin mimetics might be applicable to expand HSCs in vivo, and furthermore, to sensitize thrombopoietin receptor-expressing HSCs to cell cycle-dependent cytotoxic agents.

 

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