Abstract
Background
Dendritic cells (DCs), primary antigen-presenting cells, are now well known as an immunoregulator of many aspects of immune responses including inflammatory bowel diseases (IBDs) such as Crohn’s disease and ulcerative colitis. We have reported that PIR-A/Bhigh cDCs (conventional DCs) appeared in dextran sodium sulfate (DSS)-induced colitis and serve as a negative immunoregulator in an animal model of IBD. The immunoregulatory role of PIR-A/B+ cDCs was confirmed in both an in vitro culture system and an in vivo transfer experiment. Here, we have investigated the differentiation process of PIR-A/B+ cDCs in an in vitro inflammatory environment and examined their functions.
Methods
cDCs were isolated from the large intestinal lamina propria from C57BL/6 mice and cultured in an inflammatory environment (IL-1, IL-6, TNFα, and LPS). The appearance of PIR-A/B+ cDCs was determined after 24 h, and the in vitro-induced PIR-A/B+ cDCs were functionally and genetically examined.
Results
PIR-A/B+ cDCs were detected after a 24-h culture only in the inflammatory environment, and the cells acted as a negative immunoregulator when examined in an allogenic mixed leukocyte reaction (MLR). The message level of IL-27 was highly upregulated in PIR-A/B+ cDCs, while that of high mobility group box 1 protein (HMGB1) was downregulated in these cells. This was well in accordance with the fact that PIR-A/B+ cDCs showed a suppressive function against activated T cells. We found that PIR-A/B+ cDCs produced IL-27, as verified by an ELISA assay, and that the inhibitory effect by PIR-A/B+ cDCs was, at least partially, due to IL-27. Furthermore, CD85d+ cells, a human counterpart of mouse PIR-A/B+ cDCs, were found in the lamina propria of the colon of the patients with ulcerative colitis, but not in the similar part of the non-inflammatory area of colon specimens from patients with colon cancer.
Conclusions
PIR-A/B+ cDCs induced in an in vitro inflammatory environment model showed a suppressive function against activated T cells by producing an inhibitory cytokine.
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Acknowledgements
The authors thank Dr. Hiroyuki Gonda, Central Research of Laboratory, for his help with the flow cytometry analyses. We also thank Mari Mino-Kendson MD., Dept. Pathology, Massachusetts General Hospital, for her helpful advice in pathological studies.
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Supplementary Figure 1. Appearance of PIR-A/B+ cDC subset in mice with DSS-induced colitis. The colon-derived DC-enriched population was stained with FITC–anti-CD11c, PE–anti-PIR-A/B, and APC–anti-CD45R mAbs, and the cells with the PIR-A/B+ immunophenotypes in the B220- (CD11c+) DCs were determined on days 0 (before the induction of colitis, A) and 5 after the treatment of DSS (B). The result shown here is representative of three replicate experiments. Dead cells were gated out by stain with propidium iodide. (JPEG 333 kb)
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Supplementary Figure 2. Effect of IFNα in the induction of PIR-A/B+ cDCs. The colon-derived cDCs were prepared from normal mice, and PIR-A/B- cDCs were sorted using a FACSAria. The sorted PIR-A/B- cDCs were cultured with [GM-CSF (1μg/m/l) + IL-1 (10 ng/ml) + IL-6 (10 ng/ml) + TNFα (10 ng/ml)] (A), [GM-CSF + IL-1+ IL-6 + TNFα + IFNα (10 ng/ml)] (B), or [GM-CSF + IL-1 + IL-6 + TNFα + LPS (100 ng/ml)] (C). The DCs were harvested 48 hours later and the frequency of PIR-A/B+ cDCs (shown as gate R3 in the dot plot) were assessed using a FACS Calibur HG™ after staining with DCs with FITC–anti-CD11c mAb and PE–anti-PIR-A/B mAb. (JPEG 368 kb)
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Supplementary Figure 3. Heat map and scatter plot. A heat map of cytokine-related genes is shown in A, and a scatter plot of PIR-A/B+ cDCs versus PIR-A/B- cDCs is shown in B. (JPEG 354 kb)
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Supplementary Figure 3. Heat map and scatter plot. A heat map of cytokine-related genes is shown in A, and a scatter plot of PIR-A/B+ cDCs versus PIR-A/B- cDCs is shown in B. (JPEG 654 kb)
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Supplementary Figure 4. Assessment of the inhibitory function of purified PIR-A/B+ cDCs by CFSE assay. The inhibitory function of purified PIR-A/B+ cDCs was examined by CFSE assay. Purified CD4+ T cells were stained with a CFSE reagent before the MLR culture. Four days later, the proliferative activity of CD4+ T cells was assessed using a FACSCanto II. In the histogram, the region M1 shows highly proliferative cells, and M2 shows moderately proliferative cells. The number in the figure shows the percentage of cells in each region (means and standard deviations of triplicated cultures. $, **, ##: p<0.01, #; p<0.05). It is noted that the stimulatory activity of PIR-A/B+ cDCs (E) is lower than that of splenic DCs (B). (JPEG 513 kb)
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Supplementary Figure 5. Effect of anti-TGF-β Ab on the inhibitory function of PIR-A/B+ cDCs. Effect of anti-TGF-β Ab on the inhibitory function of PIR-A/B+ cDCs was examined in MLR and by CFSE assay. Purified CD4+ T cells were stimulated with splenic DCs (B), and in vitro-generated PIR-A/B+ cDCs were added to MLR (C). Furthermore, anti-IL-27 Ab or anti-TGF-β Ab was added to MLR to assess the effect on on the inhibitory function of PIR-A/B+ cDCs. The number in the figure shows the percentage of cells in each region (means and standard deviations of triplicated cultures. $; p<0.01, **; p<0.05). (JPEG 502 kb)
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Supplementary Figure 6. IL-2 production by CD4+ T cells in MLR. IL-2 in the supernatant of the MLR was determined using an ELISA kit for IL-2. Columns and bars in the figure represent means and standard deviations of triplicated cultures. (JPEG 398 kb)
535_2018_1447_MOESM8_ESM.xls
Footnote for Supplementary Table 1. The expression of cytokine-related genes assayed by a microarray analysis is represented as excel data. (XLS 1444 kb)
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Matsui, F., Inaba, M., Uchida, K. et al. Induction of PIR-A/B+ DCs in the in vitro inflammatory condition and their immunoregulatory function. J Gastroenterol 53, 1131–1141 (2018). https://doi.org/10.1007/s00535-018-1447-1
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DOI: https://doi.org/10.1007/s00535-018-1447-1