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Interleukin-18 Directly Activates T-Bet Expression and Function Via P38

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Interleukin-18 Directly Activates T-Bet Expression and Function Via P38 723 Interleukin-18 directly activates T-bet expression and function via p38 mitogen-activated protein kinase and nuclear factor-KB in acute myeloid leukemia– derived predendritic KG-1 cells Malte Bachmann, Cristina Dragoi, T-bet may play a key role in processes that have the Marco A. Poleganov, Josef Pfeilschifter, potential to correct the T helper type 1 deficiency asso- and Heiko Mu¨hl ciated with leukemia-mediated immunosuppression. [Mol Cancer Ther 2007;6(2):723–31] Pharmazentrum Frankfurt/ZAFES, Klinikum der Johann Wolfgang Goethe-Universita¨t, Frankfurt am Main, Germany Introduction Interleukin (IL)-18 is a proinflammatory T helper type 1 Abstract (Th1)–like cytokine that is secreted primarily by mono- The leukemic cell line KG-1 wasisolatedfrom a patient cytes/macrophages and dendritic cells upon activation of with acute myeloid leukemia and isregarded a cellular the innate immune system.In fact, this cytokine seems to be model of human dendritic cell progenitors. The T helper located at a rather proximal position within the proin- type 1 cytokine interleukin (IL)-18 hasbeen shownto flammatory cytokine cascade and plays a pivotal role in the induce the maturation of these cells towards a dendritic generation of efficient immunity against various bacterial phenotype and, moreover, isable to mediate IFN ; pro- and viral infections (1–9).A prominent function of IL-18 is duction in this model. Because T-box expressed in T cells its crucial role as an efficient costimulus for IFNg (T-bet) isconsideredto be of paramount importance for production, particularly in synergism with IL-12 or T cell dendritic cell function, the effectsof IL-18 on thistrans- receptor stimulation.Besides T cells and natural killer cells, cription factor have been investigated in the current study. human dendritic cells (DC) are also capable of potently Here, we show that activation of KG-1 cells by IL-18 releasing IFNg under the influence of IL-18 (3, 10).IL-18 inducesT-bet mRNA and protein within 4 to 6 h of biological activity seems to be controlled by an IFNg- incubation. Thishitherto unrecognized function of IL-18 induced negative feedback loop mediated by the IL-18 was suppressed by the inhibition of p38 mitogen-activated opponent IL-18–binding protein (11).Interestingly, it has protein kinase activity and nuclear factor-KB function. recently been shown that IL-18 was able to induce the Blockage of translation by cycloheximide, usage of maturation of human monocyte–derived dendritic cells neutralizing antibodies, and the inability of IFN; to mediate with regard to biochemical as well as functional character- significant p38 mitogen-activated protein kinase activa- istics (12). tion in KG-1 cellsclearly revealed that activation of T-bet The transcription factor T-box expressed in T cells (T-bet; wasnot via autocrine IFN ;. T-bet function wasevaluated Tbx21) has been identified as chief determinant of Th1 by short interfering RNA technology. Notably, specific lineage commitment and Th1-like immune responses in suppression of T-bet induction impaired secretion of IFN; general (13, 14).In fact, ectopic expression of T-bet in highly by KG-1 cellsunder the influence of IL-18. Therapeutic polarized human Th2 cells lead to the strong induction of application of IL-18 hasthe potential to profoundly affect IFNg, which is a prominent Th1 signature cytokine (15).A the biology of acute myeloid leukemia predendritic cells recent genetic approach further underscored the relevance such as KG-1 cells. Under these conditions, activation of of T-bet for Th1/Th2 decisions in humans (16).Interest- ingly, T-bet is up-regulated in patients with Crohn’s disease, an inflammatory disorder considered to be driven by Th1-like cytokines.Spontaneous IFN g production by Received 8/17/06; revised 12/1/06; accepted 12/28/06. ex vivo –cultured lamina propria mononuclear cells obtained Grant support: Deutsche Forschungsgemeinschaft DFG MU1284 from these patients was actually associated with high levels (H. Mu¨hl). of T-bet expression (17).T-bet–deficient mice display The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked drastically increased susceptibility for severe infection with advertisement in accordance with 18 U.S.C. Section 1734 solely to Salmonella (18) or Mycobacterium tuberculosis (19).These indicate this fact. observations again emphasize important functions of this Note: M. Bachmann and C. Dragoi contributed equally to this work. transcription factor in Th1-dependent immunity.Recent Requests for reprints: Heiko Mu¨hl, Pharmazentrum Frankfurt, Klinikum der data also indicate that T-bet activation is a key determinant Johann Wolfgang Goethe-Universita¨t, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany. Phone: 49-69-6301-6955; of dendritic cell function.T-bet is potently induced by IFN g Fax: 49-69-6301-7942. E-mail: [email protected] in human monocytes and myeloid dendritic cells (20). Copyright C 2007 American Association for Cancer Research. Interestingly, dendritic cells from T-bet–deficient mice doi:10.1158/1535-7163.MCT-06-0505 have severely impaired capabilities to produce IFNg (21). Mol Cancer Ther 2007;6(2). February 2007 Downloaded from mct.aacrjournals.org on September 24, 2021. © 2007 American Association for Cancer Research. 724 IL-18–Induced T-bet in KG-1 Cells The KG-1 cell line was isolated from a patient with acute Detection of Human IL-18, T-bet, p38, and pp38 myeloid leukemia (AML) and displays characteristics of Mitogen-Activated Protein Kinase, Inhibitor of KBA, predendritic cells.Activation of KG-1 cells by specific and B-Actin by Western Blot Analysis cytokines including IL-18 is actually sufficient to initiate Cells were harvested using lysis buffer [150 mmol/L the process of maturation towards a clear dendritic NaCl, 1 mmol/L CaCl2, 25 mmol/L Tris-Cl (pH 7.4), 1% phenotype (12, 22).In order to further broaden the cur- Triton X-100, supplemented with protease inhibitor cocktail rent knowledge on the biology of human dendritic cells, (Roche Diagnostics, Mannheim, Germany), DTT, Na3VO4, and in particular, leukemic AML-DC, we studied the phenylmethylsulfonyl fluoride (each 1 mmol/L), and expression of T-bet in this cell type.Specifically, the effects NaF (20 mmol/L)].Unless otherwise indicated, 50 Agof of the IFNg-inducing factor IL-18 on T-bet are investigated total protein per lane were used.Antibodies and herein. SDS-PAGE conditions: IL-18, 15% SDS-PAGE, polyclonal antibody R&D Systems; T-bet, 10% SDS-PAGE, monoclonal antibody (Santa Cruz Biotechnology, Heidelberg, Ger- Materials and Methods many), to detect T-bet and h-actin (monoclonal anti- Chemicals body; Sigma) on the same blot, the blot was cut in half; SB203580, SB202190, and InB kinase (IKK) inhibitor VII inhibitor of nBa (InBa), 12% SDS-PAGE, polyclonal (IKK-VII) were from Calbiochem-Novabiochem (Bad antibody (Santa Cruz Biotechnology); phospho-p38 Soden, Germany).Cycloheximide, nigericin, and the mitogen-activated protein kinase (MAPK; T180, S182), phorbolester TPA were from Sigma (Taufkirchen, Ger- 12% SDS-PAGE; for detection of total p38 MAPK blots many).IFN g was obtained from TEBU/Peprotech (Frank- were stripped and reprobed.Both p38 MAPK antibodies furt am Main, Germany), whereas IL-18 was obtained from were rabbit polyclonal (Cell Signaling, Frankfurt am Main, R&D Systems/MBL (Wiesbaden, Germany).An IFN g- Germany). neutralizing antibody (NA/LE quality) was purchased Analysis of IFN;, RelB, and Glyceraldehyde-3-Phos- from BD Bioscience/PharMingen (Heidelberg, Germany). phate Dehydrogenase by Standard PCR Cultivation of KG-1Cells, HL-60 Cells, and THP-1Cells After RNA isolation (peqGold TriFast; Peqlab, Erlangen, The human AML-DC cell line KG-1 was obtained from Germany), 1 Ag of total RNA was transcribed using the German Collection of Microorganisms and Cell hexameric primers and Moloney virus reverse transcriptase Cultures (Braunschweig, Germany).Cells were cultivated (Applied Biosystems, Darmstadt, Germany).The follow- in RPMI 1640 supplemented with 100 units/mL of ing sequence was done for each PCR reaction: 95jC for penicillin, 100 Ag/mL of streptomycin, and 10% heat- 10 min (1 cycle); 95jC for 30 s, 60jC [RelB, glyceraldehyde- inactivated FCS (Life Technologies, Eggenstein, Germany). 3-phosphate dehydrogenase (GAPDH)] or 50jC (IFNg) for For experiments, cells were routinely seeded at a density 30 s, and 72jC for 1 min (with variable number of cycles); Â 6 of 6 10 cells/2 mL in six-well polystyrene plates and a final extension phase at 72jC for 7 min.The numbers (Greiner, Frickenhausen, Germany) using the aforemen- of cycles for GAPDH, IFNg, and RelB were 23, 30, and 37, tioned medium.AML-HL-60 cells (kindly provided by respectively.To study IFN g/RelB/GAPDH expression, the Prof.Steinhilber, Institute of Pharmaceutical Chemistry, following primers were used: IFNg, forward, 5¶-AGTTA- Johann Wolfgang Goethe-University, Frankfurt am Main, TATCTTGGCTTTTCA-3¶; reverse, 5¶-AGTCAGTTACCGA- Germany) were maintained and stimulated as described ATAATTA-3¶; RelB, forward, 5¶-CATCCTGGACCACT- for KG-1 cells.Monocytic THP-1 cells were obtained from TCCTGC-3¶; reverse, 5¶-GAACATGTTGCTGCCCAGAAG- the German Collection of Microorganisms and Cell 3¶; GAPDH, forward, 5¶-ACCACAGTCCATGCCATCAC-3¶, Cultures.Cells were maintained and stimulated in the reverse, 5¶-TCCACCACCCTGTTGCTGTA-3¶.Amplicon aforementioned supplemented RPMI 1640 culture medium length was 363, 355, and 452 bp for IFNg, RelB, and (plus 10 mmol/L HEPES) using polystyrene flasks GAPDH, respectively. (Greiner).For experiments, 2 or 1 mL of cell suspen- Transfection of KG-1Cells sions were seeded into six-well or 24-well polystyrene Either T-bet–directed short interfering RNA (siRNA; Â 6 plates, respectively (Greiner), at 0.5 10 cells/mL.All 5¶-GGAAGUUUCAUUUGGGAAAdTdT-3¶; Ambion, Cam- j incubations of cells were done at 37 C and 5% CO2.Cell bridgeshire, United Kingdom; 0.4 Ag) or control siRNA viability was determined by the trypan blue dye exclusion (Silencer Negative Control siRNA #1, Ambion; 0.4 Ag) were assay.
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