Reference : Characterization of spontaneous bone marrow recovery after sublethal total body irrad...
Scientific journals : Article
Life sciences : Anatomy (cytology, histology, embryology...) & physiology
http://hdl.handle.net/2268/116091
Characterization of spontaneous bone marrow recovery after sublethal total body irradiation: importance of the osteoblastic/adipocytic balance.
English
Poncin, Géraldine mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Histologie - Cytologie]
Beaulieu, Aurore mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Histologie - Cytologie]
Humblet, Chantal mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Histologie - Cytologie]
Thiry, Albert mailto [Université de Liège - ULg > Département des sciences cliniques > Département des sciences cliniques]
Oda, Kimimitsu [> > > >]
Boniver, Jacques mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Département des sciences biomédicales et précliniques]
Defresne, Marie-Paule mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Histologie - Cytologie]
2012
PLoS ONE
Public Library of Science
7
2
e30818
Yes (verified by ORBi)
International
1932-6203
San Franscisco
CA
[en] Many studies have already examined the hematopoietic recovery after irradiation but paid with very little attention to the bone marrow microenvironment. Nonetheless previous studies in a murine model of reversible radio-induced bone marrow aplasia have shown a significant increase in alkaline phosphatase activity (ALP) prior to hematopoietic regeneration. This increase in ALP activity was not due to cell proliferation but could be attributed to modifications of the properties of mesenchymal stem cells (MSC). We thus undertook a study to assess the kinetics of the evolution of MSC correlated to their hematopoietic supportive capacities in mice treated with sub lethal total body irradiation. In our study, colony-forming units - fibroblasts (CFU-Fs) assay showed a significant MSC rate increase in irradiated bone marrows. CFU-Fs colonies still possessed differentiation capacities of MSC but colonies from mice sacrificed 3 days after irradiation displayed high rates of ALP activity and a transient increase in osteoblastic markers expression while ppargamma and neuropilin-1 decreased. Hematopoietic supportive capacities of CFU-Fs were also modified: as compared to controls, irradiated CFU-Fs significantly increased the proliferation rate of hematopoietic precursors and accelerated the differentiation toward the granulocytic lineage. Our data provide the first evidence of the key role exerted by the balance between osteoblasts and adipocytes in spontaneous bone marrow regeneration. First, (pre)osteoblast differentiation from MSC stimulated hematopoietic precursor's proliferation and granulopoietic regeneration. Then, in a second time (pre)osteoblasts progressively disappeared in favour of adipocytic cells which down regulated the proliferation and granulocytic differentiation and then contributed to a return to pre-irradiation conditions.
http://hdl.handle.net/2268/116091
10.1371/journal.pone.0030818

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