Abstract:
:The metabolic state of quiescent hematopoietic stem cells (HSCs) is an important regulator of self-renewal, but it is unclear whether or how metabolic parameters contribute to HSC lineage specification and commitment. Here, we show that the commitment of human and murine HSCs to the erythroid lineage is dependent upon glutamine metabolism. HSCs require the ASCT2 glutamine transporter and active glutamine metabolism for erythroid specification. Blocking this pathway diverts EPO-stimulated HSCs to differentiate into myelomonocytic fates, altering in vivo HSC responses and erythroid commitment under stress conditions such as hemolytic anemia. Mechanistically, erythroid specification of HSCs requires glutamine-dependent de novo nucleotide biosynthesis. Exogenous nucleosides rescue erythroid commitment of human HSCs under conditions of limited glutamine catabolism, and glucose-stimulated nucleotide biosynthesis further enhances erythroid specification. Thus, the availability of glutamine and glucose to provide fuel for nucleotide biosynthesis regulates HSC lineage commitment under conditions of metabolic stress.
journal_name
Cell Stem Celljournal_title
Cell stem cellauthors
Oburoglu L,Tardito S,Fritz V,de Barros SC,Merida P,Craveiro M,Mamede J,Cretenet G,Mongellaz C,An X,Klysz D,Touhami J,Boyer-Clavel M,Battini JL,Dardalhon V,Zimmermann VS,Mohandas N,Gottlieb E,Sitbon M,Kinet S,Taylodoi
10.1016/j.stem.2014.06.002subject
Has Abstractpub_date
2014-08-07 00:00:00pages
169-84issue
2eissn
1934-5909issn
1875-9777pii
S1934-5909(14)00250-1journal_volume
15pub_type
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