Open AccessSWEF Proteins Distinctly Control Maintenance and Differentiation of Hematopoietic Stem Cells
Author(s) -
Tatsiana Ripich,
Carlos Andrés ChacónMartínez,
Luise Fischer,
Alessandra B. Pernis,
Nadine Kiessling,
Annette I. Garbe,
Rolf Jessberger
Publication year - 2016
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0161060
Subject(s) - haematopoiesis , progenitor cell , biology , microbiology and biotechnology , wild type , transplantation , stem cell , genetics , gene , medicine , surgery , mutant
SWAP-70 and DEF6, two proteins that feature similar domain and motif arrangements, are mainly known for their functions in differentiated hematopoietic cells. Both proteins interact with and regulate RhoGTPases and F-actin dynamics, yet their role in hematopoietic stem and precursor cells (HSPCs) remained unexplored. Here, the role of the SWEF proteins SWAP-70 and DEF6 in HSPCs was examined. Both SWEF proteins are expressed in HSCs. HSCs and different precursor populations were analyzed in mice deficient for SWAP-70, DEF6, SWAP-70 and DEF6 (double knockout, DKO), and wild-type controls. HSPCs isolated from these strains were used for competitive adoptive transfer into irradiated wild-type mice. Reconstitution of the myeloid and lymphoid lineages in the recipient mice was determined. The numbers of HSPCs in the bone marrow of Swap-70 -/- and Swap-70 -/- Def6 -/- mice were >3-fold increased. When transplanted into lethally irradiated wild-type recipients, the reconstitution potential of Swap-70 -/- HSPCs was intrinsically impaired in competing with wild-type HSPCs for contribution to hematopoiesis. Def6 -/- HSPCs show wild type-like reconstitution potential under the same transplantation conditions. DKO HSPCs reconstituted to only 25% of wild-type levels, indicating a partial rescue by DEF6 deficiency in the Swap-70 -/- background. Our study reveals the two SWEF proteins as important contributors to HSPC biology. Despite their similarity these two proteins regulate HSC/progenitor homeostasis, self-renewal, lineage contributions and repopulation in a distinct and mostly antagonistic manner.