p190-B RhoGAP and intracellular cytokine signals balance hematopoietic stem and progenitor cell self-renewal and differentiation

Ashwini Hinge, Juying Xu, Jose Javier, Eucabeth Mose, Sachin Kumar, Reuben Kapur, Edward F. Srour, Punam Malik, Bruce J. Aronow and Marie-Dominique Filippi ()
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Ashwini Hinge: Cincinnati Children's Research Foundation, University of Cincinnati College of Medicine
Juying Xu: Cincinnati Children's Research Foundation, University of Cincinnati College of Medicine
Jose Javier: Cincinnati Children's Research Foundation, University of Cincinnati College of Medicine
Eucabeth Mose: Cincinnati Children's Research Foundation, University of Cincinnati College of Medicine
Sachin Kumar: Cincinnati Children's Research Foundation, University of Cincinnati College of Medicine
Reuben Kapur: Indiana University School of Medicine
Edward F. Srour: Indiana University School of Medicine
Punam Malik: Cincinnati Children's Research Foundation, University of Cincinnati College of Medicine
Bruce J. Aronow: Cincinnati Children’s Research Foundation, University of Cincinnati College of Medicine
Marie-Dominique Filippi: Cincinnati Children's Research Foundation, University of Cincinnati College of Medicine

Nature Communications, 2017, vol. 8, issue 1, 1-14

Abstract: Abstract The mechanisms regulating hematopoietic stem and progenitor cell (HSPC) fate choices remain ill-defined. Here, we show that a signalling network of p190-B RhoGAP-ROS-TGF-β-p38MAPK balances HSPC self-renewal and differentiation. Upon transplantation, HSPCs express high amounts of bioactive TGF-β1 protein, which is associated with high levels of p38MAPK activity and loss of HSC self-renewal in vivo. Elevated levels of bioactive TGF-β1 are associated with asymmetric fate choice in vitro in single HSPCs via p38MAPK activity and this is correlated with the asymmetric distribution of activated p38MAPK. In contrast, loss of p190-B, a RhoGTPase inhibitor, normalizes TGF-β levels and p38MAPK activity in HSPCs and is correlated with increased HSC self-renewal in vivo. Loss of p190-B also promotes symmetric retention of multi-lineage capacity in single HSPC myeloid cell cultures, further suggesting a link between p190-B-RhoGAP and non-canonical TGF-β signalling in HSPC differentiation. Thus, intracellular cytokine signalling may serve as ‘fate determinants’ used by HSPCs to modulate their activity.

Date: 2017
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DOI: 10.1038/ncomms14382

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