RT Journal Article
SR Electronic
T1 Ubiquitous overexpression of CXCL12 confers radiation protection and enhances mobilization of hematopoietic stem and progenitor cells
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 2020.01.08.899427
DO 10.1101/2020.01.08.899427
A1 Smrithi Rajendiran
A1 Stephanie Smith-Berdan
A1 Leo Kunz
A1 Maurizio Risolino
A1 Licia Selleri
A1 Timm Schroeder
A1 E Camilla Forsberg
YR 2020
UL http://biorxiv.org/content/early/2020/01/09/2020.01.08.899427.abstract
AB C-X-C Motif Chemokine Ligand 12 (CXCL12; aka SDF1α) is a major regulator of a number of cellular systems, including hematopoiesis where it influences hematopoietic cell trafficking, proliferation, and survival during homeostasis and upon stress and disease. A variety of constitutive, temporal, ubiquitous and cell-specific loss-of-function models have documented the functional consequences on hematopoiesis upon deletion of Cxcl12. Here, in contrast to loss-of-function experiments, we implemented a gain-of-function approach by generating a dox-inducible transgenic mouse model that enables spatial and temporal overexpression of Cxcl12. We demonstrated that ubiquitous CXCL12 overexpression led to an increase in multipotent progenitors in the bone marrow and spleen. The CXCL12+ mice displayed reduced reconstitution potential as either donors or recipients in transplantation experiments. Additionally, we discovered that Cxcl12 overexpression improved hematopoietic stem and progenitor cell mobilization into the blood, and conferred radioprotection by promoting quiescence. Thus, this new CXCL12+ mouse model provided new insights on major facets of hematopoiesis and serves as a versatile resource for studying CXCL12 function in a variety of contexts.