| First Author | Karigane D | Year | 2016 |
| Journal | Cell Stem Cell | Volume | 19 |
| Issue | 2 | Pages | 192-204 |
| PubMed ID | 27345838 | Mgi Jnum | J:238357 |
| Mgi Id | MGI:5819156 | Doi | 10.1016/j.stem.2016.05.013 |
| Citation | Karigane D, et al. (2016) p38alpha Activates Purine Metabolism to Initiate Hematopoietic Stem/Progenitor Cell Cycling in Response to Stress. Cell Stem Cell 19(2):192-204 |
| abstractText | Hematopoietic stem cells (HSCs) maintain quiescence by activating specific metabolic pathways, including glycolysis. We do not yet have a clear understanding of how this metabolic activity changes during stress hematopoiesis, such as bone marrow transplantation. Here, we report a critical role for the p38MAPK family isoform p38alpha in initiating hematopoietic stem and progenitor cell (HSPC) proliferation during stress hematopoiesis in mice. We found that p38MAPK is immediately phosphorylated in HSPCs after a hematological stress, preceding increased HSPC cycling. Conditional deletion of p38alpha led to defective recovery from hematological stress and a delay in initiation of HSPC proliferation. Mechanistically, p38alpha signaling increases expression of inosine-5'-monophosphate dehydrogenase 2 in HSPCs, leading to altered levels of amino acids and purine-related metabolites and changes in cell-cycle progression in vitro and in vivo. Our studies have therefore uncovered a p38alpha-mediated pathway that alters HSPC metabolism to respond to stress and promote recovery. |
