MicroRNA-125b overexpression leads to an increase in WBCs associated with a macrocytic anemia in mice. MicroRNA-125b overexpression leads to an increase.

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MicroRNA-125b overexpression leads to an increase in WBCs associated with a macrocytic anemia in mice. MicroRNA-125b overexpression leads to an increase in WBCs associated with a macrocytic anemia in mice. C57BL/6 mice (CD45.1) were transplanted with lineage-negative hematopoietic fetal liver cells (CD45.2) that were infected with an empty retroviral vector (XZ) expressing GFP or infected with the same vector expressing GFP and miR-125b. Peripheral blood was harvested once a month for CBCs and flow cytometry analysis. (A) MicroRNA-125b expression level relative to controls in WBCs (after lysis of red cells) of mice from two different batches at 16 wk posttransplantation. (B) Percent of GFP+ cells in the peripheral blood of mice transplanted with miR-125b or control XZ infected cells over time. The first time point corresponds to the percent of GFP+ cells 3 d after the first infection in in vitro culture. t test: ***P < 0.0001. (C) Whole-blood counts of mice transplanted with control (n = 20) or miR-125b infected cells (n = 18) showing numbers of WBC, the absolute numbers of neutrophils, lymphocytes, monocytes, eosinophils and basophils, RBCs, platelets, percent hematocrit, hemoglobin concentration, and MCV (mean volume of red blood cells) at 16 wk posttransplantation. Combined data from three independent experiments are shown. Mann–Whitney test: *P < 0.05; ***P < 0.0001. (D) Representative peripheral blood flow cytometry at 16 wk posttransplantation from mice transplanted with XZ control or miR-125b–infected cells. Cd11b+Gr1+ cells correspond to granulocytes; Cd11b+Gr1− cells correspond to monocytes. Marina Bousquet et al. PNAS 2010;107:50:21558-21563 ©2010 by National Academy of Sciences