Comparison of morphology, phenotypes and function between cultured human IL‑4‑DC and IFN‑DC
- Authors:
- Published online on: September 21, 2017 https://doi.org/10.3892/mmr.2017.7581
- Pages: 7345-7354
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Copyright: © Jin et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
Dendritic cells (DCs) are the most potent professional antigen-presenting cells (APC). As we know, DCs can capture, process and present antigens to T cells and play a key role in the induction of Ag-specific immune responses to viruses, bacteria, allergens and tumor antigens (1). DCs have been commonly used in cancer immunotherapy in recent years. However, there are only a low frequency of DCs (<2%) in human peripheral blood mononuclear cells (PBMCs) and peripheral organs. Moreover, this population cannot be expanded in vitro (2,3). As a result, DCs separated from human PBMCs or organs directly have been seldom applied to clinical trials. Instead the monocyte-derived DCs have been widely studied in clinical trials as these DCs subsets could sustain most of DCs function and be cultured much easier compared with the DCs in vivo.
Traditionally, investigators use granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin (IL)-4 to stimulate monocyte to differentiate into IL-4-DC. Reports have showed that IL-4-DC derived from both rat bone marrow and PBMCs can present and cross-present antigens in vitro (4,5). Moreover, IL-4-DC has been utilized in immunotherapy of cancer and HIV infection. Recent studies have showed that interferon (IFN)-α is an important cytokine belonging to the type I IFN family, which is endowed with potent antiviral, antitumor, and immunoregulatory activities (6). Paquette et al (7) firstly revealed that IFN-α and GM-CSF could induce the differentiation of monocytes into IFN-DC. Some reports have showed that IFN-DC could be more effective than IL-4 DC to induce cluster of differentiation (CD)4+ T cell and CD8+ T cell response in different models (8–11). Lapenta et al (8) found that IFN-DC loaded with HIV-1 antigen could induce the cross-priming of CD8+ T cells against HIV in the hu-PBL-SCID mouse more effectively than IL-4 DC. Moreover, IFN-DC could cross-present low amounts of nonstructural-3 protein (NS3) of hepatitis C virus (HCV) and activate HCV-specific CD8+ T cells efficiently (12). However, the mechanisms of the effect of IFN-DC remain to be determined and the details of the phenotypes and function of these DCs still need to be explored.
In this study, we cultured both IFN-DC and IL-4-DC and investigated the difference between these two DCs subsets in the aspects of cell morphology, cell phenotypes and secretion of cytokines. The function of IFN-DC and IL-4-DC in the presentation and cross-presentation of virus antigen also was explored.
Materials and methods
Human blood donors and preparation of PBMCs
PBMCs were obtained from healthy volunteers. Written informed consents were obtained from all donors in accordance with the Declaration of Helsinki. PBMCs were isolated using Ficoll density gradient centrifugation (TBD, Tianjin, China) and cultured in RPMI-1640 medium containing 10% fetal bovine serum (FBS; Gibco; Thermo Fisher Scientific, Inc., Waltham, MA, USA), 100 U/ml penicillin and 100 ng/ml streptomycin. All studies were approved by the Institutional Review Board (IRB) of the Second Hospital of Nanjing.
Cell separation and DC generation
Monocytes were isolated by immunomagnetic cell sorting (MACS Cell Isolation kits; Miltenyi Biotec, Bergisch Gladbach, Germany). Positive selected CD14+ cells were analyzed by flow cytometry. Purity of the CD14+ cells was >98%. Purified CD14+ monocytes were cultured in RPMI-1640 medium containing 10% FBS, 100 U/ml penicillin and 100 ng/ml streptomycin at the concentration of 1×106/ml, supplemented with 1,000 U/ml IFN-α2b (Anterferon;, Anhui, China) and 40 ng/ml GM-CSF for IFN-DC or 20 ng/ml IL-4 (both from R&D Systems, Minneapolis, MN, USA) and 40 ng/ml GM-CSF for IL-4-DC. The cells were incubated at 37°C and 5% CO2 for 5 days. Half of the supernatants were moved and fresh cytokines and mediums were added every 3 days. DCs were matured by adding 20 ng/ml tumor necrosis factor-α (TNF-α; R&D Systems) and culturing for another 48 h.
Electron microscopy
For ultrastructural analysis, electron microscopy was performed using standard procedures (13). Briefly, all samples were washed and fixed in 2.5% glutaraldehyde in 85 mM phosphate buffer (pH 7.2) and post-fixed in OsO4 solution. Then the cells were dehydrated in graded alcohol solutions and embedded in epoxy resin. Mature IFN-DC and IL-4-DC were examined at 80 kV under Hitachi electron microscope H-7650.
Immunophenotypic analysis
Cultured DCs were washed and resuspended in PBS containing 1% FBS and incubated with a series of monoclonal antibodies (mAbs) including anti-HLA-DR, CD11c, CD80, CD83 and CD86 (BD Pharmingen, San Diego, CA, USA) for 30 min at 4°C. All mAbs were conjugated with PerCp-, APC, or PE-. Then the samples were analyzed by a fluorescence-activated cell sorting (FACS)Canto II flow cytometer (BD Biosciences, San Jose, CA, USA). Data were collected with BD FACSDiva software and analyzed with TreeStar FlowJo software.
Cytokine secretion analysis
Supernatants from immature and mature DCs were harvested at day 5 and day 7 separately. Cytokine concentrations of supernatants were determined by ELISA. IL-10, IL-18, IL-23, IL-1β and IL-12p70 were measured using the ELISA kits according to the manufacturer's protocol (Multi Sciences, Hangzhou, China).
Analysis of antigen-specific T cells by intracellular IFN-γ staining
For antigen presentation assays, cultured DCs from heathy donors were seeded into a 96-well round-bottomed plate at 1×105 cells/well. Then, 10 µg/ml cytomegalovirus (CMV)-pp65 protein (Miltenyi Biotec) was added into the specified wells. After 2 h, CD4+ and CD8+ T lymphocytes obtained by immunomagnetic cells sorting as described above were co-cultured with CMV-pp65 protein loaded DCs at the DCs/T lymphocytes ratio of 1:10 in RPMI-1640 containing 10% human AB serum, 100 U/ml penicillin and 100 ng/ml streptomycin for 12 h at 37°C. Then GolgiPlug protein transport inhibitor (BD Pharmingen) was added into the wells. After another 6 h, cells were harvested and washed in washing buffer and stained with live/dead fixable dead cell staining (Invitrogen; Thermo Fisher Scientific, Inc.), FITC-conjugated anti-CD4, PE-conjugated anti-CD8 and PerCp-conjugated anti-CD3 (BD Pharmingen) for 30 min at 4°C. After washing, the cells were fixed and permeabilized by the Cytofix/Cytoperm solution (BD Pharmingen) for 20 min at 4°C. Then the cells were rewashed in perm washing buffer and stained with APC-conjugated anti-IFN-γ (BD Pharmingen) for 30 min at 4°C. At last, the cells were analyzed on a BD Canto II flow cytometer.
Statistics
Data were expressed as means ± SEMs and analyzed with SPSS V20.0 software. The statistical significance of differences was determined by the Student's t-test and one-way ANOVA. A value of P<0.05 was considered to indicate a statistically significant result.
Results
Morphological analysis of IFN-DC and IL-4-DC
In the past few years, some reports have showed that IFN-DC and IL-4-DC had some similar characteristics of DCs in morphology (14). However, McRae et al (15) showed that IL-4-DC contained more and longer spikes than IFN-DC. So we explored the details of these two DCs subsets in morphology. We cultured purified CD14+ monocytes added with GM-CSF and IFN-α or GM-CSF and IL-4 to get immature IFN-DC (imIFN-DC) and immature IL-4 DC (imIL-4-DC), respectively.
TNF-α, LPS, CD40L and polyinosinic:polycytidylic acid (poly I:C) was reported to be used to promote the mature of DCs in vitro (16,17). However, disable DCs could be induced by the stimulation of LPS or poly I:C (17). So TNF-α was used to induce imIFN-DC and imIL-4-DC to differentiate into mature IFN-DC (mIFN-DC) and mature IL-4-DC (mIL-4-DC). Then morphological differences between mIFN-DC and mIL-4-DC were compared by scanning electron micoscopy. Fig. 1A and B showed that the size of mIL-4-DC was larger than mIFN-DC. Meanwhile, the outcomes of FACS analyses were consistent with the electron micoscopy results and both mIFN-DC and mIL-4-DC appeared to be larger in size compared with the monocytes (P<0.01) (Fig. 1C and D). Furthermore, although both mIFN-DC and mIL-4-DC obtained numerous of pseudopodia, the sharp of the spikes of mIFN-DC was short and thick while the mIL4-DC had long and thin spikes (Fig. 1A and B). On the other hand, we observed that mIFN-DC contained more organelles, like endoplasmic reticulum, and myelin figures than mIL-4-DC while mIL-4-DC contained more vacuoles in the cells.
Comparison of the cell phenotypes between IFN-DC and IL-4-DC
To investigate the difference of the cell phenotypes between IFN-DC and IL-4-DC, we detected the expression of CD14 on the surface of imIFN-DC and imIL-4-DC firstly. Compared with the monocytes, both of imIFN-DC and imIL-4-DC expressed much lower CD14 as shown in Fig. 2. And there was no obvious difference between imIFN-DC and imIL-4-DC for the expression of CD14 (P>0.05).
Then, we analyzed the expression of major histocompatibility complex (MHC) I molecules HLA-DR, mDC marker CD11c, costimulatory molecules CD80 and CD86 and mature marker CD83 of IFN-DC and IL-4-DC. The results showed that the expression of HLA-DR, CD11c, CD80, CD83 and CD86 were up-regulated on both imIFN-DC and imIL-4-DC compared with monocytes (Fig. 3A). After the maturation of DCs stimulated by TNF-α, we detected the expression of these phenotypic markers again. As illustrated in Fig. 3B and C, mIFN-DC expressed higher HLA-DR, CD11c, CD83 and CD86 compared with imIFN-DC (P<0.001), and mIL-4-DC expressed higher CD11c, CD80 and CD83 compared with imIL-4-DC (P<0.001). Compared with mIL-4-DC, HLA-DR and CD86 were expressed higher on the surface of mIFN-DC (P<0.001) while the expression of CD80 and CD83 had no obvious difference (P>0.05). Intriguingly, mIFN-DC expressed lower CD11c compared with mIL-4-DC (P<0.01).
Cytokines secreted by IFN-DC and IL-4-DC
A series of cytokines, such as IL-12, IL-27 and IL-10, could be secreted by DCs and these cytokines played a key role in immune response (18–20). So, we evaluated the cytokines secretion in the supernatants from DCs cultures. Supernatants were quantified for IL-10, IL-18, IL-23, IL-1β and IL-12p70 by ELISA. When comparing between imIFN-DC and imIL-4-DC, there was no obvious difference for the secretion of cytokines IL-10, IL-18 and IL-23 (P>0.05) (Fig. 4A-C). However, IL-1β could be secreted more effectively by imIFN-DC than imIL-4-DC (P<0.05) (Fig. 4D). The secretion of IL-12p70 could not be detected in neither imIFN-DC group nor imIL-4-DC group (Fig. 4E). In response to TNF-α, these two mature DCs could secrete amounts of IL-12p70. Meanwhile, mIFN-DC could secrete more IL-12p70, IL10, IL-18 and IL-1β compared with mIL-4-DC (P<0.05). In contrast, there was no difference between mIFN-DC and mIL-4-DC for the secretion of IL-23 (P>0.05).
Comparison of the presentation ability between IFN-DC and IL-4-DC to activate CMV-pp65 specific T lymphocytes
To investigate the presentation ability of IFN-DC and IL-4-DC, the immature and mature IFN-DC or IL-4-DC loaded with the CMV-pp65 protein were cultured with autologous CD4+ and CD8+ T cells, respectively. Then the percentages of IFN-γ+CD4+ and IFN-γ+CD8+ T lymphocytes were detected by flow cytometry intracellular staining (Fig. 5A and B). The results showed that there was no obvious difference for the percentages of IFN-γ+CD4+ and IFN-γ+CD8+ T lymphocytes between imIFN-DC group, imIL-4-DC and negative control group (P>0.05) (Fig. 5C and D). After maturation, both of mIFN-DC and mIL-4 could induce the secretion of IFN-γ of CD4+ and CD8+ T lymphocytes compared with the negative control (P<0.05). Notably, when compared with the mIL-4-DC, mIFN-DC loaded with CMV-pp65 protein could activate higher proportion of autologous CD4+ T cells (0.91% vs. 0.31%, P<0.001) and CD8+ T cells (0.90% vs. 0.48%, P<0.001) to secret IFN-γ (Fig. 5C and D).
Discussion
Monocytes play diverse roles in human immunity, such as clearance of senescent cells, pathogen killing and immune regulation (21,22). In vivo, monocytes can differentiate into macrophages. In vitro, monocytes from separated human PBMCs can be induced to differentiate into DC after the stimulation of numerous cytokines (23). In the past, IL-4 combined with GM-CSF were widely used to induce the differentiation of monocytes (17,24). Wang et al (25) discovered that IL-4-DC could express more phenotypes of mature cells than GM-CSF DC developed by culturing monocytes with GM-CSF alone. In recent years, many researchers have focused on the exploit of IFN-DC developed by culturing monocytes with GM-CSF and IFN-α as this DCs subset could be more effective than IL-4-DC in the aspect of antigen cross-presentation (26). Moreover, some studies revealed that the antigen presentation of IL-4-DC relied on the signal transducer and activator of transcription 6 (STAT6) while IFN-DC was not, suggesting that these two DCs have different presenting ways (25,27,28). Although IFN-DC and IL-4-DC have been studied for several years, the details of the morphology, phenotype and function of these DCs still need to be explored. In this study, we showed that the morphologies of these two DCs were different in cell size, shape, spikes and cell internal structure. The phenotypes and secreted cytokines of IFN-DC and IL-4-DC were diverse. Furthermore, after loaded with CMV-pp65 protein, IFN-DC could induce the activation of antigen specific CD4+ and CD8+ T cells more effectively than IL-4-DC.
Firstly, the scanning electron micoscopy results showed that mIFN-DC contained abundant organlles compared with mIL-4-DC. In contrast, mIL-4-DC contained more vacuoles in the cells. This phenomenon was consistent with the results observed in BM-derived IL-4-DC from Lewis rats (29). Spadaro et al (10) used FITC conjugated OVA as antigen to explore the transportation of soluble antigen in IFN-DC and IL-4-DC. The results showed that IFN-DC took more than 24 h to digest antigen while IL-4-DC needed 3 h, which suggested that IL-4-DC possessed a more rapid degradation and endosomal acidification way than IFN-DC. According to our results, we speculated that the diversity of morphology of these two DCs might be the reason of the different route and mechanism of antigen entry of IFN-DC and IL-4-DC. However, the more details of the different endocytosis of these two DCs still need to be explored in future.
Then, we investigated the phenotypes of immature and mature IFN-DC and IL-4-DC. Of interest, there were no obvious difference for the expression of CD83 which was the mature marker of DCs between IFN-DC and IL-4-DC. This result was consistent with the study conducted by Carbonneil et al (30). However, some reports have revealed that the level of the expression of CD83 on the surface of imIFN-DC was higher compared to imIL-4-DC (31,32). Fujii et al (33) discovered that the costimulatory molecules CD80 and CD86 were necessary for the maturation of DCs. Our study showed that the CD80 expression had no obvious difference between these two mature DCs while the expression of CD86 by mIFN-DC was significantly higher than mIL-4-DC. Both CD80 and CD86 are prototypical members of the B7 co-signaling molecule family (34). Some studies showed that CLTA-4 was the preferential receptor for CD80 while CD28 bound mostly to CD86 (35,36). And the most important function of CD28 is to induce the proliferation of T cells. Moreover, Lenschow and co-workers have found that CD86 could be expressed constitutively following T cell interaction with APCs (37). So we speculated that the different expression of CD80 and CD86 by IFN-DC and IL-4-DC might be one of the reasons explaining the higher antigen presenting ability of IFN-DC compared with IL-4-DC (38). There was no obvious difference for the expression of Class II MHC antigens HLA-DR and mDC marker CD11c between the immature IFN-DC and IL-4-DC. However, the expression of HLA-DR by mIFN-DC was higher than mIL-4-DC, while the CD11c expression was lower than mIL-4-DC. As HLA-DR is critical for DC to prime CD4+ cells, higher expression of HLA-DR by IFN-DC may be another reason to explain its stronger ability of presentation compared with IL-4-DC (39). The different expression of CD11c by these two DCs may reflect the different function of cell adhesion as CD11c is involved in the adhesion of cells (40).
Next, we analyzed the secretion of cytokines IL-18, IL-23, IL-12p70, IL-1β and IL-10 by IFN-DC and IL-4-DC. It is known that IL-18, IL-23, IL-12p70, IL-1β are the T helper cell 1 (Th1) pro-inflammatory cytokines and IL-10 is the Th2 anti-inflammatory cytokine (38,41,42). And for cytokines IL-18, the most important biological activity is to induce T, B and NK cells to secret IFN-γ (43). Although there was no difference for the secretion of IL-18 between imIFN-DC and imIL-4-DC, IL-18 secreted by mIFN-DC was significantly higher than mIL-4-DC. This result is consistent with the study of Mohamad which have showed that the pro-IL-18 protein existed in IFN-DC but not in IL-4-DC by western blot analysis (1). IL-23 and IL-12p70, as the members of cytokines IL-12 family, are the main stimulators of memory T cells proliferation and can induce the generation of pro-inflammatory Th1 and Th17 cells (44,45). Moreover, IL-23 has been reported that it could synergize with IL-12 in promoting the production of cytokines by DC themselves (46). Our results showed that the secretions of IL-23 and IL-12p70 by both two types of mature DCs were increased dramatically compared with the immature DCs, which was consistent with the strong effect of mature DCs in activing T cells. As a member of the IL-1 family of cytokines, IL-1β is an important mediator of inflammatory response and also involved in proliferation, differentiation, and apoptosis of immune cells. In our results, IL-1β was secreted more effectively by IFN-DC than IL-4-DC, which might explain the stronger presenting function of IFN-DC.
At last we compared the function of presenting protein antigen between IFN-DC and IL-4-DC by detecting the IFN-γ secretion by T cells. In accordance with our expectation, both of mature IFN-DC and IL-4-DC could present and cross-present CMV-pp65 protein more effectively than immature DCs, which was in consistent with the results of the cytokines secretion above. In consideration of the low percentage of the specific T cells for CMV-pp65 protein in PBMC, the IFN-γ producing by CD4+ and CD8+ were relative low and the results were in line with the study by de Niet et al (47). On the other hand, we found that mIFN-DC was more effective in the priming of antigen specific CD4+ and CD8+ T cells than mIL-4-DC which had been reported by other studies (1,19,48).
As a matter of fact, one of the most critical issues for DC-based vaccines is to identify the ‘optimal’ DCs subset. This study revealed the diversity between IFN-DC and IL-4-DC in the aspect of morphology, phenotypes and cytokines secretion. The data also suggested that IFN-DC could be more effective than IL-4-DC in priming and cross-priming T cells. Our results supported the view that the IFN-DC-based vaccine might be a more attractive and effective strategy for the immunotherapy.
Acknowledgements
This research was partially supported by grants from the National Natural Science Foundation of China (no. 81402559 to W.Y.), the Science and Technology Commission of Nanjing (no. 201605033 to W.Y.), the Project of Six Talent Peaks of Jiangsu Province (no. WSN-177 to W.Y.) and the Jiangsu Provincial Special Program of Medical Science (no. BL2014005 to Y.Y.).
Glossary
Abbreviations
Abbreviations:
|
APC |
antigen-presenting cells |
|
CLTA-4 |
cytotoxic T lymphocyte-associated antigen-4 |
|
DCs |
dendritic cells |
|
FACS |
fluorescence-activated cell sorting |
|
FBS |
fetal bovine serum |
|
GM-CSF |
granulocyte macrophage-colony stimulating factor |
|
HCV |
hepatitis C virus |
|
IFN-α |
interferon-α |
|
IL-4 |
interleukin-4 |
|
mAbs |
monoclonal antibodies |
|
MHC |
major histocompatibility complex |
|
PBMCs |
peripheral blood mononuclear cells |
|
poly I:C |
polyinosinic: polycytidylic acid |
|
STAT6 |
signal transducer and activator of transcription 6 |
|
Th1 |
T helper cell 1 |
|
Th2 |
T helper cell 2 |
|
Th17 |
T helper cell 17 |
|
TNF-α |
tumor necrosis factor-α |
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