In-vitro influence of mycophenolate mofetil (MMF) and Ciclosporin A (CsA) on cytokine induced killer (CIK) cell immunotherapy
- Melanie Bremm†1Email author,
- Sabine Huenecke†1,
- Olga Zimmermann1,
- Verena Pfirrmann1,
- Andrea Quaiser1,
- Halvard Bonig2, 3,
- Jan Soerensen1,
- Thomas Klingebiel1,
- Eva Rettinger1,
- Peter Bader1 and
- Claudia Cappel1
© The Author(s) 2016
Received: 30 April 2016
Accepted: 30 August 2016
Published: 13 September 2016
Cytokine-induced-killer (CIK) cells are a promising immunotherapeutic approach for impending relapse following hematopoietic stem cell transplantation (HSCT). However, there is a high risk for treatment failure associated with severe graft versus host disease (GvHD) necessitating pharmaceutical intervention post-transplant. Whether immunosuppression with mycophenolate mofetil (MMF) or Ciclosporin A (CsA) influences the cytotoxic effect of CIK cell immunotherapy is still an open issue.
CIK cells were generated from PBMC as previously described followed by co-incubation with mycophenolic acid (MPA) or CsA. Proliferation, cytotoxicity and receptor expression were investigated following short- (24 h), intermediate- (3 days) and long-term (7 days) MPA incubation with the intention to simulate the in vivo situation when CIK cells were given to a patient with relevant MPA/CsA plasma levels.
Short-term MPA treatment led to unchanged proliferation capacity and barely had any effect on viability and cytotoxic capability in vitro. The composition of CIK cells with respect to T-, NK-like T- and NK cells remained stable. Intermediate MPA treatment lacked effects on NKG2D, FasL and TRAIL receptor expression, while an influence on proliferation and viability was detectable. Furthermore, long-term treatment significantly impaired proliferation, restricted viability and drastically reduced migration-relevant receptors accompanied by an alteration in the CD4/CD8 ratio. CD3+CD56+ cells upregulated receptors relevant for CIK cell killing and migration, whereas T cells showed the most interference through significant reductions in receptor expression. Interestingly, CsA treatment had no significant influence on CIK cell viability and the cytotoxic potential against K562.
Our data indicate that if immunosuppressant therapy is indispensable, efficacy of CIK cells is maintained at least short-term, although more frequent dosing might be necessary.
KeywordsMMF MPA CIK cells Immunosuppressive therapy Immunotherapy Allogeneic stem cell transplantation
For prevention and treatment of severe GvHD following HSCT, the immunosuppressive drug mycophenolate mofetil (MMF; Cellcept) and Ciclosporin A (CsA) may be administered . MMF is a prodrug which is systemically metabolized to the active metabolite mycophenolic acid (MPA). MPA non-competitively inhibits inosine monophosphate dehydrogenase (IMPDH) which plays an important role in the de novo nucleotide synthesis. Thereby, MPA effectively inhibits the cell proliferation depending on de novo nucleotide synthesis [4–7]. CsA is a calcineurin inhibitor, which suppresses the activation of IL-2 transcription leading to a reduced immune response especially of T cells . Patients with aGVHD >grade I and/or immunosuppression are not eligible for CIK cell therapy. Anyhow, relevant MPA plasma levels might still be present at the time of CIK cell treatment due to intra- and inter-patient variability. In addition, CIK cells may cause GvHD necessitating pharmaceutical intervention, which among others may include the administration of MMF. We previously investigated the influence of MMF on NK cells within the scope of a clinical phase I/II study where patients received IL-2 stimulated NK cell immunotherapy to target high-risk leukemia or tumors. In this evaluation we observed that short-term (24 h) MPA incubation had no or marginal effects on the phenotype and only moderately reduced cytotoxic capability of IL2-stimulated NK cells in contrast to unstimulated NK cells .
In an ongoing study we currently investigate the immunotherapy with cytokine induced killer (CIK) cells derived from peripheral blood mononuclear cells (PBMC) of the stem cell donor via stimulation with interferon (IFN)-γ, OKT-3, IL-2 and IL-15 over a period of 10–12 days [10–13]. CIK cells are a heterogeneous population primarily consisting of a minor contribution of CD3−CD56+ NK cells and a majority of CD3+CD56− T cells and CD3+CD56+ NK-like T cells [14, 15]. The cytotoxic activity of CIK cells against several tumor cell lines including leukemia, lymphoma and solid tumors was shown [16–19]. Among CIK cells, CD3+CD56+ NK-like T cells, which are derived from CD3+CD56− T cells acquiring the CD56 molecule during expansion, showed the strongest proliferation and cytotoxic potential [14, 20, 21]. In first clinical applications we and others showed the safety and feasibility of CIK cell immunotherapy, including their relatively low propensity for causing GvHD even in only partially MHC-matched recipients [14, 22, 23]. By now, IL-15 activated CIK cells have been licensed as an advanced medicinal product for patients with high-risk leukemia and myelodysplastic syndrome (ATMP § 4b Abs. 3 AMG, license number: PEI.A.11630.01.1) . Whether immunosuppressive therapy influences the survival and cytotoxic effect of CIK cell immunotherapy remains an open issue. Therefore, we investigated the in vitro effect of short, intermediate and long-term MPA incubation in therapeutically relevant concentrations on CIK cells which were manufactured over a period of 10–12 days according to our study protocol.
CIK cell generation and cultivation
CIK cells were generated from underweight banked blood of healthy donors (IRB approval 329/10) by standard ficoll separation (Biochrom AG, Berlin Germany). PBMC were adjusted to 3 × 106 cells/ml and cultured in X-VIVO 10 media (Lonza, Verviers, Belgium) supplemented with 10 % fresh frozen plasma (German Red Cross Blood Donor Service, Frankfurt, Germany) in cell culture flasks (Greiner, Nürtingen, Germany) at 37 °C and 5 % CO2. At day 0 of CIK generation 1000 U/ml IFN-γ (Imukin®, Boeringer Ingelheim Pharma, Germany) were added, followed by 100 ng/ml anti-CD3 mAB (OKT3, MACS GMP CD3 pure, Miltenyi Biotec, Bergisch Gladbach, Germany) and 500 U/ml IL-2 (Proleukin®S, Novartis Pharma, Nuremberg, Germany) 24 h later (day 1). On days 4 and 8 of culture, cell density was adjusted to 1 × 106 cells/ml and cells were re-stimulated with 50 ng/ml IL-15 (PeproTech, Rocky Hill, USA) until they were harvested on day 10. CIK cells were split; control flasks were further supplemented only with 50 ng/ml IL-15 every 3 days, test flasks were additionally spiked with a therapeutically relevant MPA concentration of 10 µM (Sigma-Aldrich, Taufkirchen, Germany) or of 5 µg/ml Ciclosporin A (CsA, Sandimmun®, Novartis Pharma GmbH, Nuremberg) after harvesting. The long term series received a further MPA/CsA treatment 3 days following harvesting.
Preparation for ex vivo investigations
Flow cytometric analyses
Flow cytometric analyses of CIK cells were performed on a Navios™ 10-color and a FC500 5-color flow cytometer (both Beckman Coulter, Krefeld, Germany). For cell staining monoclonal antibodies conjugated with fluorescein–isothiocyanate (FITC), phycoerythrin (PE), phycoerythrin-Texas Red® (ECD), phycoerythrin–cyanine-5 and 5.5 (PC-5 and PC-5.5), phycoerythrin–cyanine-7 (PC-7), allophycocyanin (APC), APC-Alexa Fluor 700 (APC-A700), APC-Alexa Fluor 750 (APC-A750), Pacific Blue™ (PB), Krome Orange (KO) were used against following antigens (clones): FITC: TCRγδ (IMMU510), CD62L (DREG56), CD226/DNAM-1 (DX11), CD11a/LFA-1 (HI111)2, PE: TCRαβ (BW242/412)1, CD314/NKG2D (ON72)/(149810)4, CD173/CD95L/FAS-Ligand (NOK-1)2, CD183/CXCR3 (2D7)2, CD195/CCR5 (1C6)2, CD262/DR5/TRAIL (DJR2-4)3; ECD: CD19 (J3-119), CD45RO (UCHL1); PC-5.5: CD45 (J.33), CD45RO (UCHL1); PC-7: CD56 (N901/NKH-1); APC: CD3 (UCHT1), CD4 (13B8.2); APC-A700: CD25 (B1.49.9); APC-A750: CD16 (3GB), CD3 (UCHT1); PB: CD14 (RMO52), CD45RA (2H4); KO: CD45 (J.33), CD8 (B9.11) (all mouse IgG1, other than #IgG2a, *IgG2b, all antibodies Beckman Coulter, except 1Miltenyi Biotec, 2BD Biosciences; 3Biolegend, 4R&D Systems). For the assessment of cell viability 7-AAD was used. Absolute counts were calculated via single-platform using Flow-Count™ fluorospheres (Beckman Coulter, Krefeld, Germany). All data were analyzed using CXP system II (Vs 2.2), Navios (Vs. 1.2) or Kaluza (Vs. 1.2) software (Beckman Coulter, Krefeld, Germany).
CIK cell cytotoxicity was tested against THP-1, K562 and MOLT-4 using the non-radioactive europium release cytotoxicity assay as described previously [16, 20]. To avoid the known discharge of the labeling reagent BATDA, K562 were previously incubated with Probenecid (Sigma-Aldrich Chemie GmbH, Steinheim, Germany). Target cells and CIK effector cells were co-cultured in triplicates at effector to target (E:T) ratios 40:1, 20:1, 10:1 and 5:1 on U-bottomed 96-well culture plates (Nunclon™, Thermo Fisher Scientific, Roskilde, Denmark). After 3 h co-incubation at 37 °C, 20 µl supernatant was collected from each well and incubated for 15 min (shaking, 250 rpm) with 200 µl Europium solution (PerkinElmer, Boston, USA). The fluorescence signal, correlating with the amount of destroyed cells, was then measured by a multilabel plate reader (VICTOR3™ 1420 multilabel counter, PerkinElmer, Boston USA). Target cells without effector cells were used as negative control. Maximum release (positive control) was obtained by target cell incubation with 16 % Triton™ X-100 solution (Sigma-Aldrich Chemie, Steinheim, Germany). Percentage of specific cytotoxicity was defined as the loss of target cells in relation to the mono-cultured control.
Supernatants of expanded CIK cells after 10 days of cultivation and then following 24 h, 3 and 7 days MPA incubation (10 µM) with respective controls were collected and assayed using BioLegend LEGENDplex™ (BioLegend, San Diego, USA). Data acquisition was performed on a Navios Flow Cytometer and analyzed with the LEGENDplex™ Data Analysis Software (BioLegend, San Diego, USA). The cell density was adjusted to 3 × 106/ml. The human inflammation 13-plex panel was designed for quantification of the cytokines/chemokines IL-1β, IFN-α, IFN-γ, TNF-α, MCP-1/CCL2, IL-6, IL-8, IL-10, IL-12p70, IL-17A, IL-18, IL-23 and IL-33. The minimum detectable concentration for the cytokines ranged from 0.6 to 2.1 pg/ml.
Statistical analysis was performed using GraphPad Prism 6 for Windows (GraphPad Software, San Diego, USA). Data were compared by paired, non-parametric Friedmann test and differences were considered as significant for p < 0.05 (*), p < 0.01 (**) and p < 0.001 (***).
Influence of MPA/CsA treatment on CIK cell expansion and viability
Cytotoxic capacity of CIK cells following MPA/CsA treatment
Changes in receptor expression and cytokine secretion as consequence of MPA treatment
The characterization of NKG2D receptor on CD4+ and CD8+ cells showed stable expression upon short- and intermediate-term MPA treatment. Only following long-term MPA incubation, downregulation of NKG2D was observed (p < 0.05, Fig. 4b). Further analysis also revealed stable expression of NKG2D on CIK cell subpopulations (T, NK and NK-like T cells) during short- and intermediate-term MPA incubation, whereas reduced NKG2D receptor expression was observed following long-term MPA exposure (T and NK cells: p < 0.05; NK-like T cells: p < 0.01, Fig. 4c).
Regarding CD25, we observed loss of expression when CIK cells were cultivated for longer than the usual culture period of 10 days. However, this reduction in CD25 expression was enhanced following MPA incubation, showing the most pronounced differences for NK-like T cells after intermediate- and long-term MPA treatment (p < 0.01) (Fig. 4d). Interestingly, we also observed a reduction in CD25 expression implicated by CsA treatment. T and NK-like T cells showed a significant reduction of CD25 expression following three (p < 0.01) and 7 days (p < 0.05) of CsA treatment whereas no significant alteration of CD25 expression on NK cells was observed (Additional file 1: Figure S1B). Furthermore, no changes in NKG2D expression in CsA treated CIK cells were examined (data not shown).
We also analyzed a panel of cytokines, i.e. IL-8, IFN-γ, MCP-1/CCL2, IL-6, IL-1β and TNFα, following short-, intermediate- and long-term MPA exposure or control incubation. Similar to CD25 expression, cytokine release was attenuated by extended cultivation. In other words, impaired functionality in terms of cytokine release was not primarily influenced by MPA, but rather through the prolonged activation period. The only cytokine significantly reduced after long-term MPA compared to control was TNFα (Additional file 2: Figure S2).
Immunotherapeutic strategies are of increasing interest in the therapy of emerging minimal residual disease or incomplete donor chimerism following HSCT. We and others have previously shown that IL-15 stimulated CIK cells are a promising immunotherapeutic approach for the treatment of patients with impending relapse following allogeneic SCT for acute leukemia or myelodysplastic syndrome [13, 19, 22, 25, 26].
CIK cells consist of a heterogeneous population of CD3+ T cells, CD3+CD56+ NK-like T cells and a minor part of CD3−CD56+ NK cells . Thereby, CIK cells are able to kill tumor cells via diverse TCR specificities and in a non-MHC-restricted manner . Different studies indicated an anti-tumor effect of CIK cells against various tumor cells mediated by the receptors or ligands NKG2D, TRAIL, DNAM and FasL [16, 28, 29]. In first clinical applications, CIK cell infusions were well tolerated and showed low incidence of GvHD even in the haplo-identical setting, which was postulated to be mainly due to less trafficking of CIK cells to GvHD sites , and due to the lack of corresponding ligands or receptors on normal tissues and hematopoietic progenitors.
Beside antileukemic efficacy, CIK cell treatment may be associated with increased risk for developing severe GvHD, especially when being applied in the haploidentical setting and in the early post-transplant period requiring immunosuppressive treatment. Furthermore, even if immunosuppression like MMF is stopped in patients at risk for relapse after HSCT, relevant MPA plasma levels might be present due to intra- and inter-patient variability . Therefore, the influence of immunosuppressive treatment, on the efficacy of cellular interventions needs to be further investigated. Hence, we analyzed the phenotype, survival and cytotoxic capacity of CIK cells during short-, intermediate- and long-term presence of MMF in vitro.
Within this study, we observed that CIK cell cytotoxicity was maintained during short-term MPA exposure, while intermediate- and long-term MPA treatment attenuated proliferation capacity, viability and cytotoxicity. Comparable results were obtained by Brehm et al.  for NK cells within the scope of a clinical phase I/II study in short- and long-term MPA treatment. In this study, NK cells were co-incubated with MPA just at the beginning of cytokine activation. In our new approach, we first generated the immunotherapeutic cells and then exposed them to MPA. Eissens et al.  and Ohata et al.  also described that MPA clearly impeded the outgrowth and the cytotoxic effect of NK cells treated with MPA. Unfortunately, a short-term MPA treatment was not investigated in these two studies. These results are contradicting Shapira et al.  who suggested that MMF does not impair GvL-effect or reduce LAK cell activity in mice. However, this might be explained by differing study protocols. Shapira et al. treated mice with MMF for a period of 8 days and afterwards generated autologous LAK cells without further addition of MMF. In contrast, we generated CIK cells according to our study protocol for 10 days and started MPA treatment after harvesting with the intention to simulate in vitro the situation when CIK cells were given to a patient who has therapeutic MPA plasma levels.
Most importantly, none or at most a marginal effect on CIK cell proliferation was seen following short-term MPA incubation. Therefore, our findings are promising, that in case of indispensable immunosuppression post HSCT, the therapy with IL-15 stimulated CIK cells will have at least short-term efficacy. We observed no significant differences of killing relevant receptor expressions of the NKG2D, TRAIL, DNAM and FasL receptors upon short- and intermediate-term MPA exposure. However, we revealed that T cells and NK-like T cells reacted differently upon MPA exposure. CD3+CD56+ NK-like T cells upregulated receptors relevant for CIK cell killing and migration, whereas CD3+ T cells downregulated these receptors. CsA treatment resulted in a non-significant reduction of proliferation and cytotoxicity, only. These results are comparable to Mehta et al.  describing that CsA inhibited anti-CD3-mediated degranulation, but did not affect cytotoxicity of CIK cells against tumor targets. Regarding cytokine/chemokine secretion, we observed no significant differences between CIK cells with and without MPA treatment expect for a significant reduction in TNFα secretion. These results are in accordance with Liu et al.  who published promising results combining CIK cell therapy with CsA treatment also describing the secretion of various cytokines including IL-2 and IL-8. In contrast, Brehm et al.  and Nagy et al.  reported a significant reduction in the secretion of IFNγ, IL-6 and other cytokines by NK cells upon MPA treatment, but here immune cells were co-incubated with MPA already during cultivation time.
Following infusion, CIK cells are described to accumulate and persist in tumor sites, resulting in tumor eradication . Wang et al.  analyzed CIK cell homing of 18F-FDG labeled CIK cells in leukemia patients by PET/CT tracking. They figured out, that 1 h following CIK cell infusion, the majority of CIK cells accumulated in the lungs, followed by a migration into brain, heart, liver and spleen at the time points 4 and 8 h post CIK cell therapy. Furthermore, tendencies of CIK cell homing into the bone marrow were shown. In the study described herein, we observed that short-term MPA incubation had no pronounced effect on proliferation, viability, cytotoxicity and CIK cell composition. Linking this information to the homing parameters analyzed by Wang et al., we might speculate that during a window of 24 h where hardly any influence of MPA on the CIK cells was seen, CIK cells might migrate to tumor sites and achieve a cytotoxic effect.
In conclusion, already generated IL-15 CIK cells that were co-incubated with MPA for at least 3 days showed significantly impaired proliferation capacity, restricted viability, alterations in receptor expression and a reduction in their cytotoxic capability compared to CIK cells that were cultivated without MPA. Interestingly, CsA treatment had no significant influence on CIK cell viability and the cytotoxic potential against K562. However, a short-term MPA incubation had only marginal or reduced effect on CIK cells. The favored strategy is to avoid immunosuppression in patients who received CIK cell immuno-therapy. However, our findings showed, that even in patients with immunosuppression e.g. for treatment of GvHD, CIK cell treatment may have at least short-term efficacy.
APC-Alexa Fluor 700
APC-Alexa Fluor 750
donor lymphocyte infusion
good manufacturing practice
hematopoietic stem cell transplantation
minimal residual disease
peripheral blood mononuclear cells
Conceived and designed the experiments: MB, SH, CC. Performed the experiments: OZ, AQ. Analyzed the data: MB, SH, AQ. Coordinated the research: SH, CC. Contributed reagents/materials/analysis tools: MB, SH, VP, OZ, AQ. Wrote the paper: MB, SH. Revised the manuscript: HB, ER, CC, VP, JS. Supervised the research: PB, TK. All authors read and approved the final manuscript.
The authors would like to thank Sibille Betz and Stephanie Erben for the excellent technical support.
The authors declare that they have no competing interests.
Availability of data and materials
All data are available in the manuscript or upon request to the authors.
Ethics approval and consent to participate
Donor PBMCs were obtained after written informed consent was given, with approval from the Ethical Review Board of the Medical Faculty of the University Hospital Frankfurt (IRB approval 329/10).
This project was supported by “Frankfurter Stiftung für krebskranke Kinder” and “Hilfe für krebskranke Kinder e.V.”, as well as “LOEWE Center for Cell and Gene Therapy Frankfurt; funded by: Hessisches Ministerium für Wissenschaft und Kunst (HMWK); funding reference number: III L 5-518/17.004”. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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- Barrett AJ, Horowitz MM, Pollock BH, Zhang MJ, Bortin MM, Buchanan GR, Camitta BM, Ochs J, Graham-Pole J, Rowlings PA, et al. Bone marrow transplants from HLA-identical siblings as compared with chemotherapy for children with acute lymphoblastic leukemia in a second remission. N Engl J Med. 1994;331:1253–8.View ArticlePubMedGoogle Scholar
- Klingebiel T, Handgretinger R, Lang P, Bader P, Niethammer D. Haploidentical transplantation for acute lymphoblastic leukemia in childhood. Blood Rev. 2004;18:181–92.View ArticlePubMedGoogle Scholar
- Windreich RM, Goyal RK, Joshi R, Kenkre TS, Howrie D, Venkataramanan R. A pilot study of continuous infusion of mycophenolate mofetil for prophylaxis of graft-versus-host-disease in pediatric patients. Biol Blood Marrow Transplant. 2016;22(4):682–9.View ArticlePubMedGoogle Scholar
- Allison AC, Eugui EM. Mycophenolate mofetil and its mechanisms of action. Immunopharmacology. 2000;47:85–118.View ArticlePubMedGoogle Scholar
- Allison AC, Eugui EM. Mechanisms of action of mycophenolate mofetil in preventing acute and chronic allograft rejection. Transplantation. 2005;80:S181–90.View ArticlePubMedGoogle Scholar
- Eugui EM, Allison AC. Immunosuppressive activity of mycophenolate mofetil. Ann N Y Acad Sci. 1993;685:309–29.View ArticlePubMedGoogle Scholar
- van Gelder T, Hesselink DA. Mycophenolate revisited. Transpl Int. 2015;28:508–15.View ArticlePubMedGoogle Scholar
- Laupacis A, Keown PA, Ulan RA, McKenzie N, Stiller CR. Cyclosporin A: a powerful immunosuppressant. Can Med Assoc J. 1982;126:1041–6.PubMedPubMed CentralGoogle Scholar
- Brehm C, Huenecke S, Esser R, Kloess S, Quaiser A, Betz S, Zimmermann O, Soerensen J, Passweg JR, Klingebiel T, et al. Interleukin-2-stimulated natural killer cells are less susceptible to mycophenolate mofetil than non-activated NK cells: possible consequences for immunotherapy. Cancer Immunol Immunother. 2014;63:821–33.View ArticlePubMedGoogle Scholar
- Rettinger E, Bonig H, Wehner S, Lucchini G, Willasch A, Jarisch A, Soerensen J, Esser R, Rossig C, Klingebiel T, Bader P. Feasibility of IL-15-activated cytokine-induced killer cell infusions after haploidentical stem cell transplantation. Bone Marrow Transplant. 2013;48:1141–3.View ArticlePubMedGoogle Scholar
- Rettinger E, Kreyenberg H, Merker M, Kuci S, Willasch A, Bug G, Ullrich E, Wels WS, Bonig H, Klingebiel T, Bader P. Immunomagnetic selection or irradiation eliminates alloreactive cells but also reduces anti-tumor potential of cytokine-induced killer cells: implications for unmanipulated cytokine-induced killer cell infusion. Cytotherapy. 2014;16:835–44.View ArticlePubMedGoogle Scholar
- Rettinger E, Kuci S, Naumann I, Becker P, Kreyenberg H, Anzaghe M, Willasch A, Koehl U, Bug G, Ruthardt M, et al. The cytotoxic potential of interleukin-15-stimulated cytokine-induced killer cells against leukemia cells. Cytotherapy. 2012;14:91–103.View ArticlePubMedGoogle Scholar
- Rettinger E, Meyer V, Kreyenberg H, Volk A, Kuci S, Willasch A, Koscielniak E, Fulda S, Wels WS, Boenig H, et al. Cytotoxic capacity of IL-15-stimulated cytokine-induced killer cells against human acute myeloid leukemia and rhabdomyosarcoma in humanized preclinical mouse models. Front Oncol. 2012;2:32.View ArticlePubMedPubMed CentralGoogle Scholar
- Linn YC, Niam M, Chu S, Choong A, Yong HX, Heng KK, Hwang W, Loh Y, Goh YT, Suck G, et al. The anti-tumour activity of allogeneic cytokine-induced killer cells in patients who relapse after allogeneic transplant for haematological malignancies. Bone Marrow Transplant. 2012;47:957–66.View ArticlePubMedGoogle Scholar
- Schmidt-Wolf IG, Lefterova P, Mehta BA, Fernandez LP, Huhn D, Blume KG, Weissman IL, Negrin RS. Phenotypic characterization and identification of effector cells involved in tumor cell recognition of cytokine-induced killer cells. Exp Hematol. 1993;21:1673–9.PubMedGoogle Scholar
- Kuci S, Rettinger E, Voss B, Weber G, Stais M, Kreyenberg H, Willasch A, Kuci Z, Koscielniak E, Kloss S, et al. Efficient lysis of rhabdomyosarcoma cells by cytokine-induced killer cells: implications for adoptive immunotherapy after allogeneic stem cell transplantation. Haematologica. 2010;95:1579–86.View ArticlePubMedPubMed CentralGoogle Scholar
- Linn YC, Lau LC, Hui KM. Generation of cytokine-induced killer cells from leukaemic samples with in vitro cytotoxicity against autologous and allogeneic leukaemic blasts. Br J Haematol. 2002;116:78–86.View ArticlePubMedGoogle Scholar
- Schmidt-Wolf IG, Negrin RS, Kiem HP, Blume KG, Weissman IL. Use of a SCID mouse/human lymphoma model to evaluate cytokine-induced killer cells with potent antitumor cell activity. J Exp Med. 1991;174:139–49.View ArticlePubMedGoogle Scholar
- Schmeel LC, Schmeel FC, Coch C, Schmidt-Wolf IG. Cytokine-induced killer (CIK) cells in cancer immunotherapy: report of the international registry on CIK cells (IRCC). J Cancer Res Clin Oncol. 2015;141:839–49.View ArticlePubMedGoogle Scholar
- Cappel C, Huenecke S, Suemmerer A, Erben S, Rettinger E, Pfirrmann V, Klingebiel T, Ullrich E, Bader P, Bremm M. Cytotoxic potential of IL-15-activated cytokine-induced killer cells against human neuroblastoma cells. Pediatr Blood Cancer. 2016;. doi:10.1002/pbc.26147.PubMedGoogle Scholar
- Lu PH, Negrin RS. A novel population of expanded human CD3+CD56+ cells derived from T cells with potent in vivo antitumor activity in mice with severe combined immunodeficiency. J Immunol. 1994;153:1687–96.PubMedGoogle Scholar
- Introna M, Borleri G, Conti E, Franceschetti M, Barbui AM, Broady R, Dander E, Gaipa G, D’Amico G, Biagi E, et al. Repeated infusions of donor-derived cytokine-induced killer cells in patients relapsing after allogeneic stem cell transplantation: a phase I study. Haematologica. 2007;92:952–9.View ArticlePubMedGoogle Scholar
- Laport GG, Sheehan K, Baker J, Armstrong R, Wong RM, Lowsky R, Johnston LJ, Shizuru JA, Miklos D, Arai S, et al. Adoptive immunotherapy with cytokine-induced killer cells for patients with relapsed hematologic malignancies after allogeneic hematopoietic cell transplantation. Biol Blood Marrow Transplant. 2011;17:1679–87.View ArticlePubMedPubMed CentralGoogle Scholar
- Rettinger E, Huenecke S, Bonig H, Merker M, Jarisch A, Soerensen J, Willasch A, Bug G, Schulz A, Klingebiel T, Bader P. Interleukin-15-activated cytokine-induced killer cells may sustain remission in leukemia patients after allogeneic stem cell transplantation: feasibility, safety and first insights on efficacy. Haematologica. 2016;101:e153–6.View ArticlePubMedPubMed CentralGoogle Scholar
- Rettinger E, Huenecke S, Bonig H, Merker M, Jarisch A, Soerensen J, Willasch A, Bug G, Schulz A, Klingebiel T, Bader P. IL-15-activated cytokine-induced killer cells may sustain remission in leukemia patients after allogeneic stem cell transplantation: feasibility, safety and first insights on efficacy. Haematologica. 2016;101(4):e153–6.View ArticlePubMedPubMed CentralGoogle Scholar
- Sangiolo D, Mesiano G, Carnevale-Schianca F, Piacibello W, Aglietta M, Cignetti A. Cytokine induced killer cells as adoptive immunotherapy strategy to augment graft versus tumor after hematopoietic cell transplantation. Expert Opin Biol Ther. 2009;9:831–40.View ArticlePubMedGoogle Scholar
- Jiang J, Wu C, Lu B. Cytokine-induced killer cells promote antitumor immunity. J Transl Med. 2013;11:83.View ArticlePubMedPubMed CentralGoogle Scholar
- Pievani A, Borleri G, Pende D, Moretta L, Rambaldi A, Golay J, Introna M. Dual-functional capability of CD3+CD56+CIK cells, a T-cell subset that acquires NK function and retains TCR-mediated specific cytotoxicity. Blood. 2011;118:3301–10.View ArticlePubMedGoogle Scholar
- Verneris MR, Kornacker M, Mailander V, Negrin RS. Resistance of ex vivo expanded CD3+CD56+ T cells to Fas-mediated apoptosis. Cancer Immunol Immunother. 2000;49:335–45.View ArticlePubMedGoogle Scholar
- Nishimura R, Baker J, Beilhack A, Zeiser R, Olson JA, Sega EI, Karimi M, Negrin RS. In vivo trafficking and survival of cytokine-induced killer cells resulting in minimal GVHD with retention of antitumor activity. Blood. 2008;112:2563–74.View ArticlePubMedPubMed CentralGoogle Scholar
- Bhatia M, Militano O, Jin Z, Figurski M, Shaw L, Moore V, Morris E, Tallamy B, van deVen C, Ayello J, et al. An age-dependent pharmacokinetic study of intravenous and oral mycophenolate mofetil in combination with tacrolimus for GVHD prophylaxis in pediatric allogeneic stem cell transplantation recipients. Biol Blood Marrow Transplant. 2010;16:333–43.View ArticlePubMedGoogle Scholar
- Eissens DN, Van Der Meer A, Van Cranenbroek B, Preijers FW, Joosten I. Rapamycin and MPA, but not CsA, impair human NK cell cytotoxicity due to differential effects on NK cell phenotype. Am J Transplant. 2010;10:1981–90.View ArticlePubMedGoogle Scholar
- Ohata K, Espinoza JL, Lu X, Kondo Y, Nakao S. Mycophenolic acid inhibits natural killer cell proliferation and cytotoxic function: a possible disadvantage of including mycophenolate mofetil in the graft-versus-host disease prophylaxis regimen. Biol Blood Marrow Transplant. 2011;17:205–13.View ArticlePubMedGoogle Scholar
- Shapira MY, Hirshfeld E, Weiss L, Zeira M, Kasir J, Or R, Resnick IB, Slavin S. Mycophenolate mofetil does not suppress the graft-versus-leukemia effect or the activity of lymphokine-activated killer (LAK) cells in a murine model. Cancer Immunol Immunother. 2005;54:383–8.View ArticlePubMedGoogle Scholar
- Mehta BA, Schmidt-Wolf IG, Weissman IL, Negrin RS. Two pathways of exocytosis of cytoplasmic granule contents and target cell killing by cytokine-induced CD3+CD56+ killer cells. Blood. 1995;86:3493–9.PubMedGoogle Scholar
- Liu S, Wang X, Lu Y, Xiao J, Liang J, Zhong X, Chen Y. The combined use of cytokine-induced killer cells and cyclosporine a for the treatment of aplastic anemia in a mouse model. J Interferon Cytokine Res. 2015;35:401–10.View ArticlePubMedGoogle Scholar
- Nagy SE, Andersson JP, Andersson UG. Effect of mycophenolate mofetil (RS-61443) on cytokine production: inhibition of superantigen-induced cytokines. Immunopharmacology. 1993;26:11–20.View ArticlePubMedGoogle Scholar
- Wang H, Cao F, Li J, Li Y, Liu X, Wang L, Liu Z, Li Y, Zhao H, Zhou J. Homing of cytokine-induced killer cells during the treatment of acute promyelocytic leukemia. Int J Hematol. 2014;100:165–70.View ArticlePubMedGoogle Scholar