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1 doi:1.138/nature1226 a MCSF level (pg/ml) h3 3h 5h 7h 15h 24h b MPP (CD135 KSL) HSC (CD34 CD15 KSLF) c % 4 ** LPS 3 GFP pos cells 2 PU.1 GFP LPS 1 FSCA Ctl NI 24h LPS Sup.Fig.1 Effect of LPS on MCSF release and PU.1 induction in HSC a) Serum levels of MCSF after LPS stimulation Median and individual concentrations of MCSF in blood serum from five mice at the indicated times after 5mg/kg intraperitoneal LPS injection. b,c)representative FACS profiles (b) and quantification (c) of GFP expression in MPP and HSC of PU.1GFP reporter mice before or after 24h of 5mg/kg LPS injection. ** p =.3, n = 4,2 1
2 RESEARCH MCSFR R.U HSC KSL Bcells Sup.Fig.2 MCSFR expression in HSC Relative expression of MCSFR normalized to GAPDH (R.U.) by qrtpcr analysis in sorted HSC, KSL (ckit, sca1, lin ) hematopoietic stem and progenitor cells (HS/PC) and CD19 Bcells from the bone marrow, as positive and negative control respectively. Error bars show standard error of the mean from duplicates. Error Bars show standard deviation from duplicates. 2
3 RESEARCH a MCSFR 5 4 R.U MCSF HSC MPP b 12 MafB 1 R.U MCSF HSC MPP Sup.Fig.3 MCSFR and MafB expression in HSC after MCSF stimulation Relative expression of MCSFR (a) and MafB (b) normalized to GAPDH (R.U.) by qrtpcr analysis in sorted HSC, 16h after control (PBS) or MCSF injection, compared to untreated MPP (CD135 KSL) as control for a population containing myeloid committed cells 3, with high MCSFR and low MafB expression, respectively. Error bars show standard deviation from duplicates. 3
4 RESEARCH a 5,3% 6,1% KSL CD15hi CD15int MCSF b 7,2% HSC GFP 69,7% GFP GFP CD15hi CD15int 53,3% GFP CD15hi CD15int MCSF CD15 5,2% 6,5% CD15hi CD15int PU1 GFP 33,2% GFP GFP CD15 7% CD15hi CD15int 52,8% CD15hi CD15int CD34 Flt3 CD34 c % 1 GFP GFP 8 6 CD15 hi HSC 4 2 Sup.Fig.4 Distribution of CD15hi HSC in GFP HSC. a) Gating strategy for CD15hi HSC in the KSL compartment following published definitions 2. b,c) Representative FACS profiles (b) and quantification (c) of CD15hi HSC subpopulations in GFP and GFP HSC from PU.1GFP mice 16h after control (PBS) or MCSF injection. 4
5 RESEARCH a CD15 hi HSC (CD34 KSLF) cumulative cell divisions MCSF cumulative number of dead cells MCSF time (h) time (h) b Total HSC (CD15 CD34 KSLF) cumulative cell divisions MCSF cumulative number of dead cells MCSF time (h) time (h) Sup.Fig.5 Recording of cell division and cell death of HSC in culture by video imaging. Cumulative cell divisions (left) and cumulative number of cells that died (right) of CD15hi (a) and total (b) HSC for 1 and 36 input cells respectively, over the indicated times in culture with or without MCSF. The vast majority of first cell divisions occurred after 24h and nearly no additional cell death occurred after minimal initial sorting and culture stress. No significant differences in proliferation or cell death were detected between culture with or without MCSF. 5
6 RESEARCH MCSF PI Annexin Sup.Fig.6 Analysis of viability of HSC after MCSF stimulation Propidium iodide / Annexin V staining of HSC after 16h in culture with or without MCSF. 6
7 RESEARCH h genes Lympho Myelo E Meg E Meg Lin Myelo Myelo/Lympho Mix single cells Sup.Fig.7 Blow up of Fig.3a, showing single cell gene expression analysis of HSC before culture. The genes analyzed are classified and colour coded on top according to published gene expression analysis of early lineage committed progenitors 4,41. PU.1 is indicated by an asterix. Cells are clustered according to lineage identity indicated on the right. Meg MegE Lin neg >3,2 <12,86 7
8 RESEARCH MCSF genes Lympho Myelo E Meg E Meg Lin Myelo Myelo/Lympho single cells Mix Sup.Fig.8 Blow up of Fig.3b, showing single cell gene expression analysis of HSC after 16h culture without MCSF. The genes analyzed are classified and colour coded on top according to published gene expression analysis of early lineage committed progenitors 4,41. PU.1 is indicated by an asterix. Cells are clustered according to lineage identity indicated on the right. Meg MegE Lin neg >3,2 <12,86 8
9 RESEARCH genes Lympho Myelo E Meg E Meg Lin Myelo Myelo/Lympho single cells Sup.Fig.9 Blow up of Fig.3c, showing single cell gene expression analysis of HSC after 16h culture with MCSF. The genes analyzed are classified and colour coded on top according to published gene expression analysis of early lineage committed progenitors 4,41. PU.1 is indicated by an asterix. Cells are clustered according to lineage identity indicated on the right. Mix Meg MegE >3,2 <12,86 9
10 RESEARCH a PU.1 GFP CD h PU.1 HSC PU.1 cells 2w 2w GMP/MEP spleen GMP/MEP spleen b 1.2 spleen ** c % 5 spleen * 4 GMP/ MEP.8.4 GMP in CD PU.1 PU.1 PU.1 PU.1 d Sup.Fig.1 Differentiation potential of MCSF induced PU.1 cells a) Experimental design for transplantation of sorted CD45.2 PU.1 HSC before and after induction of PU.1 cells in MCSF culture into sublethally irradiated recipients and analysis of progeny cells after 2 weeks in the spleen. b,c) Quantification of the ratio of donor GMP to MEP progenitors (b) and total GMP (c) derived from transplanted PU.1 HSC before or PU.1 cells after MCSF culture. **p =.2, *p =.7, n = 6,7. d) Cells with macrophage morphology phagocytosing fluorescent latex beads after continued culture of PU.1 cells in MCSF for 1 days. 1
11 ratio RESEARCH a MCSF CD h HSC CD45.2 GMP MEP in spleen (2w) CD45.2 Myelo/Lympho in blood (4w) b 3 Spleen GMP MEP 124 Monocytes/Bcells * ** *** c Blood 256 % in CD45.2 cells Sup.Fig.11 Differentiation potential of MCSF primed HSC a) Experimental design for transplantation of in vivo MCSF primed CD45.2 HSC into sublethally irradiated recipients and analysis of progeny cells after 2 weeks in the spleen or 4 weeks in the blood. b) Percentage of GMP and MEP progenitors in total donor cells derived from control (PBS) or MCSF primed HSC in the spleen 2 weeks after transplantation. *p =.1, **p =.4, n = 4,4 c) Quantification of the ratio of donor CD11b SSC lo monocytes to CD19 Bcells in the blood 4 weeks after transplantation. ***p =.9, n = 8,
12 RESEARCH a MCSF CD45.2 ActinGFP 16h competitor CD45.2 HSC HSC 46w GFP in CD45.2 blood cells Myelo/Lympho in GFP Myelo/Mega in GFP b Red cell lyzed total Blood Mac1 CD19 Mac1 CD19 CD45.2 Mac1 SSC SSC CD19 Red cell lyzed total Blood CD19 total Blood CD61 CD45.2 CD19 CD45.2 FSC/SSC low CD61 GFP CD19 CD45.2 GFP CD61 Myeloid Lymphoid Platelets FSC GFP GFP Sup.Fig.12 Competitive transplantation of MCSF primed HSC a) Experimental design for competitive transplantation of FACS sorted in vivo MCSF primed HSC (CD15CD34CD135KSL) from actingfp CD45.2 mice together with CD45.2 competitor HSC into lethally irradiated recipients and analysis of blood cell contribution. b) Gating strategy for quantification of actingfp HSC derived myeloid, lymphoid blood cells and platelets. 12
13 RESEARCH c % GFP 1 ** 4 weeks 6 weeks 14 weeks Myelo B Cells Platelets Myelo B Cells Platelets Myelo B Cells Platelets T Cells Sup.Fig.12 Competitive transplantation of MCSF primed HSC c) Donor contribution to blood of competitively reconstituted mice 4, 6 and 14 weeks after transplantation of MCSF primed or control HSC, expressed as percentage of GFP donor cells in Mac myeloid, CD19 B Cells, CD61 Platelets (4, 6 and 14 weeks) and CD3e T Cells (14 weeks) and normalized to total GFP contribution in CD45.2 donor compartment. ** p =.3, n = 6,
14 RESEARCH pi:c MCSF PU.1 fl/fl PU.1 fl/fl PU.1 fl/fl MxCre ct PU.1 Δ PU.1 fl Sup.Fig.13 Analysis of PU1 deletion PCR analysis to detect deleted (PU.1Δ) and loxp flanked (PU.1fl) PU.1 alleles in samples transplanted in fig.4i from control or MCSF primed HSC isolated from PU.1fl/fl::MxCre or PU.1fl/fl bone marrow 7 days after last treatment with pi:c. 14
15 RESEARCH FSC/SSC singlet SSCA SSCH CD45.2 FSCA SSCW CD45.2 CD45.2 GMP CD117 CD117/Sca1 Prog CD16/32 MEP Sca1 CD34 Sup.Fig.14 Gating strategy for detection of HSC derived donor CD45.2 GMP and MEP populations in the spleens of recipients. 15
16 RESEARCH h MCSF Myeloid total Myeloid total Myeloid total Experiment Experiment Experiment total p=,1 p=,1 Sup.table 1, related to Fig 3a,b,c Summary of cell numbers with myeloid identity in three independent single cell nanofluidic real time PCR experiments on FluidigmTM array for freshly isolated HSC (h) or after 16 hour of culture in the absence or the presence of MCSF. HSC were FACS sorted as CD15CD34CD48KSLF (experiment 1,3) or CD15CD34KSLF (experiment 2). Experiment 3 is shown in Fig.3a and sup.fig
17 RESEARCH Supplementary Discussion The M CSF receptor can activate multiple partially connected downstream signalling pathways 28, including Src, PI3K and Erk kinase that were tested by chemical inhibition in our assays. Src kinase can activate both PI3K and Erk signalling 28,42, which in turn can activate c/ebpα, c Jun, Runx1 and NFkB transcription factors that are known to control the promoter and upstream regulatory element (URE) enhancer of the pu.1 gene 46 5 and to be functionally important in early hematopoietic stem/progenitor cells 48,49,51,52. It will be interesting in the future to determine the relative importance of these factors in M CSF induced PU.1 expression in HSC. Supplementary References 4 Laslo, P. et al. Multilineage transcriptional priming and determination of alternate hematopoietic cell fates. Cell 126, (26). 41 Pronk, C. J. et al. Elucidation of the phenotypic, functional, and molecular topography of a myeloerythroid progenitor cell hierarchy. Cell Stem Cell 1, (27). 42 McCubrey, J. A. et al. Roles of the RAF/MEK/ERK and PI3K/PTEN/AKT pathways in malignant transformation and drug resistance. Adv Enzyme Regul 46, , (26). 43 Jack, G. D., Zhang, L. & Friedman, A. D. M CSF elevates c Fos and phospho C/EBPalpha(S21) via ERK whereas G CSF stimulates SHP2 phosphorylation in marrow progenitors to contribute to myeloid lineage specification. Blood 114, , (29). 44 Bae, S. C. & Lee, Y. H. Phosphorylation, acetylation and ubiquitination: the molecular basis of RUNX regulation. Gene 366, 58 66, (26). 45 Buitenhuis, M. & Coffer, P. J. The role of the PI3K PKB signaling module in regulation of hematopoiesis. Cell Cycle 8, , (29). 46 Lichtinger, M. et al. RUNX1 reshapes the epigenetic landscape at the onset of haematopoiesis. EMBO J 31, , (212). 47 Yeamans, C. et al. C/EBPalpha binds and activates the PU.1 distal enhancer to induce monocyte lineage commitment. Blood 11, , (27). 48 Huang, G. et al. PU.1 is a major downstream target of AML1 (RUNX1) in adult mouse hematopoiesis. Nat Genet 4, 51 6, (28). 49 Bonadies, N. et al. PU.1 is regulated by NF kappab through a novel binding site in a 17 kb upstream enhancer element. Oncogene 29, , (21). 5 Leddin, M. et al. Two distinct auto regulatory loops operate at the PU.1 locus in B cells and myeloid cells. Blood 117, , (211). 51 Zhang, P. et al. Enhancement of hematopoietic stem cell repopulating capacity and self renewal in the absence of the transcription factor C/EBP alpha. Immunity 21, (24). 52 Steidl, U. et al. Essential role of Jun family transcription factors in PU.1 knockdown induced leukemic stem cells. Nat Genet 38, , (26). 17
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