TGF-β combined with M-CSF and IL-4 induces generation of immune inhibitory cord blood dendritic cells capable of enhancing cytokine-induced ex vivo expansion.

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Presentation transcript:

TGF-β combined with M-CSF and IL-4 induces generation of immune inhibitory cord blood dendritic cells capable of enhancing cytokine-induced ex vivo expansion of myeloid progenitors by Geling Li, Saeid Abediankenari, Young-June Kim, Timothy B. Campbell, Shigeki Ito, Barbara Graham-Evans, Scott Cooper, and Hal E. Broxmeyer Blood Volume 110(8):2872-2879 October 15, 2007 ©2007 by American Society of Hematology

TGF-β1 induces a homogeneous DC morphology for M-DCs. TGF-β1 induces a homogeneous DC morphology for M-DCs. CB monocytes were cultured with GM-CSF and IL-4 or M-CSF and IL-4 to generate GM-DCs and M-DC, respectively (left panels). TGF-β1 was added into GM-DC and M-DC cultures at the beginning of cell culture (right panels). Pictures were taken on day 5 of culture. Results are representative of more than 10 independent experiments. Cell morphology and photographs were observed and taken under a Zeiss Axiovert 25 inverted fluorescence light microscope (Carl Zeiss Microimaging, Thornwood, NY) with a CCD digital camera and computer for image analysis. Cell photographs were taken at a magnification of 400×. Geling Li et al. Blood 2007;110:2872-2879 ©2007 by American Society of Hematology

Effects of TGF-β1 on phenotypic markers of M-DCs. Effects of TGF-β1 on phenotypic markers of M-DCs. CB monocytes were cultured with M-CSF and IL-4 ± TGF-β1 for 5 to 6 days. LPS was added on the last day of cell culture. Cells were stained with CD1a, CD80, CD86, CD207 (langerin), HLA-DR, and CD83. Gray line designates isotype control. The black area represents indicated molecules. The mean fluorescence intensities of indicated molecules are shown on the upper right corner of the histograms. Results are representative of 3 to 5 independent experiments. Geling Li et al. Blood 2007;110:2872-2879 ©2007 by American Society of Hematology

Enhancing effects of conditioned medium produced by mature (LPS-stimulated) TGF-M-DCs on expansion of CFU-GM progenitors from CB. (A) CM from TGF-M-DCs selectively expands CFU-GM ex vivo in synergy with SFT. Freshly isolated CD34+ cells (1 × 104/mL) were in... Enhancing effects of conditioned medium produced by mature (LPS-stimulated) TGF-M-DCs on expansion of CFU-GM progenitors from CB. (A) CM from TGF-M-DCs selectively expands CFU-GM ex vivo in synergy with SFT. Freshly isolated CD34+ cells (1 × 104/mL) were incubated with CM from M-DCs, TGF-M-DCs, GM-DCs, TGF-GM-DCs, control CM, or control medium plus or minus SFT for 1 week. Cells were harvested and plated in triplicate. Fold expansion of CFU-GMs after 1-week culture was determined. Data represent a summary of CM from 8 different CB donors. Average fold expansion of CFU-GMs is shown on the top of each bar. (B) Neutralizing anti–M-CSF Ab, but not control Ab, blocks the ex vivo myeloid-enhancing activity of TGF-M-DC CM. Isolated CD34+ cells (1 × 104/mL) were cultured with those factors as indicated on the x-axis in the presence of SFT for 1 week. Fold expansion of CFU-GMs after 1-week culture is shown on the y-axis. The average fold-expansion level of CFU-GMs is shown on the top of each bar. The data represent an average plus or minus SEM from 4 experiments for the neutralizing anti–M-CSF and 2 experiments for the recombinant M-CSF. Geling Li et al. Blood 2007;110:2872-2879 ©2007 by American Society of Hematology

Effect of mature (LPS-induced) TGF-M-DCs, in comparison with mature M-DCs, in regulation of T-cell proliferation and tolerance. Effect of mature (LPS-induced) TGF-M-DCs, in comparison with mature M-DCs, in regulation of T-cell proliferation and tolerance. (A) Mature TGF-M-DCs are similar to mature M-DCs in induction of allogeneic MLR, both at lower efficiency than mature GM-DCs in MLR. LPS-activated TGF-M-DCs, M-DCs, and GM-DCs were stimulated with allogeneic naive CD4+ T cells for 6 days. T-cell proliferation was determined by [methyl-3H]thymidine incorporation for the last 16 hours of cell culture. (B) TGF-M-DCs induce T-cell tolerance/regulatory T cells with similar efficiency to that of M-DCs. T1 and T2 are naive CD4+ T cells (donor A) prestimulated with mature TGF-M-DCs or M-DCs (donor B) for 7 days. T1 and T2 (2.5 × 104) were restimulated with allogeneic GM-CSF/IL-4–induced DCs in secondary MLR, and both of T1 and T2 were hyporesponsive T cells (top panel). Also, T1 and T2 (2.5 × 104) were added to another MLR containing naive CD4+ T cells (5 × 104; donor A) and GM-CSF/IL-4–induced DCs (5 × 103; donor B) (bottom panel). Proliferation of T cells was determined by [3H]thymidine incorporation after 6 days of culture. Results are representative of 3 independent experiments. (C) CB CD4+ T cells were cocultured with LPS-activated GM-DCs, M-DCs, and TGF-M-DCs derived from both CB and AB in MLR for 7 days. Cells were harvested and stained with anti–CD4-FITC, anti–CD25-PE, and intracellular anti–Foxp3-APC. The top row is CD4+ T cells isolated from CB stained with anti-CD4, anti-CD25, and isotype control IgG for APC. The percentages of gated cell population are shown on the upper-right corner of dot plots. Results are one representative of 3 CB and 6 AB. Geling Li et al. Blood 2007;110:2872-2879 ©2007 by American Society of Hematology

Mature TGF-M-DCs are less efficient in induction of allogeneic MLR than mature TGF-GM-DCs. Mature TGF-M-DCs are less efficient in induction of allogeneic MLR than mature TGF-GM-DCs. LPS-activated mature TGF-M-DCs and TGF-GM-DCs were stimulated with allogeneic naive CD4+ T cells for 6 days. T-cell proliferation was determined by [methyl-3H]thymidine incorporation assay. Data are representative of 3 independent experiments. Geling Li et al. Blood 2007;110:2872-2879 ©2007 by American Society of Hematology

TGF-M-DCs respond to LPS with markedly enhanced phosphorylation of members of MAPK pathway (ERK, JNK, and p38) compared with TGF-GM-DCs. TGF-M-DCs respond to LPS with markedly enhanced phosphorylation of members of MAPK pathway (ERK, JNK, and p38) compared with TGF-GM-DCs. TGF-M-DCs and TGF-GM-DCs were either not treated (as a control) or treated side by side for 15 and 30 minutes with LPS. Cell lysate was subjected to Western blotting using rabbit polyclonal antibodies specific for p-ERK, -JNK, or -P38. PVDF membranes were stripped and reprobed with a rabbit polyclonal antibody specific for total ERK as a loading control. Geling Li et al. Blood 2007;110:2872-2879 ©2007 by American Society of Hematology