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Volumn 350, Issue , 2018, Pages 52-63

Feraheme® suppresses immune function of human T lymphocytes through mitochondrial damage and mitoROS production

Author keywords

Immunosuppression; Immunotoxicity; Iron oxide; Nanoparticles; T Cells

Indexed keywords

CASPASE 3; CASPASE 9; CD71 ANTIGEN; FERROPORTIN; FERUMOXYTOL; REACTIVE OXYGEN METABOLITE; FERRIC ION; FERRIC OXIDE; METAL NANOPARTICLE;

EID: 85046730968     PISSN: 0041008X     EISSN: 10960333     Source Type: Journal    
DOI: 10.1016/j.taap.2018.04.028     Document Type: Article
Times cited : (36)

References (48)
  • 1
    • 0037362778 scopus 로고    scopus 로고
    • Soluble transferrin receptor for the evaluation of erythropoiesis and iron status
    • Beguin, Y., Soluble transferrin receptor for the evaluation of erythropoiesis and iron status. Clin. Chim. Acta 329:1–2 (2003), 9–22.
    • (2003) Clin. Chim. Acta , vol.329 , Issue.1-2 , pp. 9-22
    • Beguin, Y.1
  • 2
    • 0025029018 scopus 로고
    • Establishment of a human T-acute lymphoblastic leukemia cell line with a (16;20) chromosome translocation
    • Ben-Bassat, H., Shlomai, Z., Kohn, G., Prokocimer, M., Establishment of a human T-acute lymphoblastic leukemia cell line with a (16;20) chromosome translocation. Cancer Genet. Cytogenet. 49:2 (1990), 241–248.
    • (1990) Cancer Genet. Cytogenet. , vol.49 , Issue.2 , pp. 241-248
    • Ben-Bassat, H.1    Shlomai, Z.2    Kohn, G.3    Prokocimer, M.4
  • 3
    • 85020083648 scopus 로고    scopus 로고
    • Regulation of T-Cell Functions by Oxidative Stress
    • M.J. Alcaraz O. Gualillo O. Sánchez-Pernaute Springer New York New York, NY
    • Bennett, S.J., Griffiths, H.R., Regulation of T-Cell Functions by Oxidative Stress. Alcaraz, M.J., Gualillo, O., Sánchez-Pernaute, O., (eds.) Studies on Arthritis and Joint Disorders, 2013, Springer New York, New York, NY, 33–48.
    • (2013) Studies on Arthritis and Joint Disorders , pp. 33-48
    • Bennett, S.J.1    Griffiths, H.R.2
  • 4
    • 0043269302 scopus 로고    scopus 로고
    • Function and structure of complex II of the respiratory chain
    • Cecchini, G., Function and structure of complex II of the respiratory chain. Annu. Rev. Biochem. 72 (2003), 77–109.
    • (2003) Annu. Rev. Biochem. , vol.72 , pp. 77-109
    • Cecchini, G.1
  • 5
    • 84862948985 scopus 로고    scopus 로고
    • A new nano-sized iron oxide particle with high sensitivity for cellular magnetic resonance imaging
    • Chen, C.L., Zhang, H., Ye, Q., Hsieh, W.Y., Hitchens, T.K., Shen, H.H. et al., A new nano-sized iron oxide particle with high sensitivity for cellular magnetic resonance imaging. Mol. Imaging Biol. 13:5 (2011), 825–839.
    • (2011) Mol. Imaging Biol. , vol.13 , Issue.5 , pp. 825-839
    • Chen, C.L.1    Zhang, H.2    Ye, Q.3    Hsieh, W.Y.4    Hitchens, T.K.5    Shen, H.H.6
  • 7
    • 84936989710 scopus 로고    scopus 로고
    • In vitro hematological and in vivo immunotoxicity assessment of dextran stabilized iron oxide nanoparticles
    • Easo, S.L., Mohanan, P.V., In vitro hematological and in vivo immunotoxicity assessment of dextran stabilized iron oxide nanoparticles. Colloids Surf B Biointerfaces 134 (2015), 122–130.
    • (2015) Colloids Surf B Biointerfaces , vol.134 , pp. 122-130
    • Easo, S.L.1    Mohanan, P.V.2
  • 8
    • 84983353701 scopus 로고    scopus 로고
    • Cytochrome c as a potentially clinical useful marker of mitochondrial and cellular damage
    • Eleftheriadis, T., Pissas, G., Liakopoulos, V., Stefanidis, I., Cytochrome c as a potentially clinical useful marker of mitochondrial and cellular damage. Front. Immunol., 7, 2016, 279.
    • (2016) Front. Immunol. , vol.7 , pp. 279
    • Eleftheriadis, T.1    Pissas, G.2    Liakopoulos, V.3    Stefanidis, I.4
  • 9
    • 85046753400 scopus 로고    scopus 로고
    • FERAHEME® (ferumoxytol) Injection [package insert], AMAG Pharmaceuticals, Inc. Waltham, MA
    • FERAHEME® (ferumoxytol) Injection [package insert], AMAG Pharmaceuticals, Inc. Waltham, MA. 2015.
    • (2015)
  • 10
    • 85020198424 scopus 로고    scopus 로고
    • Iron oxide nanoparticles induced cytotoxicity, oxidative stress and DNA damage in lymphocytes
    • Gaharwar, U.S., Meena, R., Rajamani, P., Iron oxide nanoparticles induced cytotoxicity, oxidative stress and DNA damage in lymphocytes. J. Appl. Toxicol. 37:10 (2017 Oct), 1232–1244, 10.1002/jat.3485.
    • (2017) J. Appl. Toxicol. , vol.37 , Issue.10 , pp. 1232-1244
    • Gaharwar, U.S.1    Meena, R.2    Rajamani, P.3
  • 12
    • 84878601189 scopus 로고    scopus 로고
    • Targeting immunosuppression for cancer therapy
    • Ghirelli, C., Hagemann, T., Targeting immunosuppression for cancer therapy. J. Clin. Invest. 123:6 (2013), 2355–2357.
    • (2013) J. Clin. Invest. , vol.123 , Issue.6 , pp. 2355-2357
    • Ghirelli, C.1    Hagemann, T.2
  • 13
    • 84988811274 scopus 로고    scopus 로고
    • Iron oxide nanoparticles modulate lipopolysaccharide-induced inflammatory responses in primary human monocytes
    • Grosse, S., Stenvik, J., Nilsen, A.M., Iron oxide nanoparticles modulate lipopolysaccharide-induced inflammatory responses in primary human monocytes. Int. J. Nanomedicine 11 (2016), 4625–4642.
    • (2016) Int. J. Nanomedicine , vol.11 , pp. 4625-4642
    • Grosse, S.1    Stenvik, J.2    Nilsen, A.M.3
  • 15
    • 79960617268 scopus 로고    scopus 로고
    • A comparative study of the physicochemical properties of iron isomaltoside 1000 (Monofer), a new intravenous iron preparation and its clinical implications
    • Jahn, M.R., Andreasen, H.B., Futterer, S., Nawroth, T., Schunemann, V., Kolb, U. et al., A comparative study of the physicochemical properties of iron isomaltoside 1000 (Monofer), a new intravenous iron preparation and its clinical implications. Eur. J. Pharm. Biopharm. 78:3 (2011), 480–491.
    • (2011) Eur. J. Pharm. Biopharm. , vol.78 , Issue.3 , pp. 480-491
    • Jahn, M.R.1    Andreasen, H.B.2    Futterer, S.3    Nawroth, T.4    Schunemann, V.5    Kolb, U.6
  • 16
    • 0032505127 scopus 로고    scopus 로고
    • Essential requirement for caspase-8/FLICE in the initiation of the Fas-induced apoptotic cascade
    • Juo, P., Kuo, C.J., Yuan, J., Blenis, J., Essential requirement for caspase-8/FLICE in the initiation of the Fas-induced apoptotic cascade. Curr. Biol. 8:18 (1998), 1001–1008.
    • (1998) Curr. Biol. , vol.8 , Issue.18 , pp. 1001-1008
    • Juo, P.1    Kuo, C.J.2    Yuan, J.3    Blenis, J.4
  • 17
    • 0019907946 scopus 로고
    • A new subtype of human T-cell leukemia virus (HTLV-II) associated with a T-cell variant of hairy cell leukemia
    • Kalyanaraman, V.S., Sarngadharan, M.G., Robert-Guroff, M., Miyoshi, I., Golde, D., Gallo, R.C., A new subtype of human T-cell leukemia virus (HTLV-II) associated with a T-cell variant of hairy cell leukemia. Science 218:4572 (1982), 571–573.
    • (1982) Science , vol.218 , Issue.4572 , pp. 571-573
    • Kalyanaraman, V.S.1    Sarngadharan, M.G.2    Robert-Guroff, M.3    Miyoshi, I.4    Golde, D.5    Gallo, R.C.6
  • 19
    • 33845977959 scopus 로고    scopus 로고
    • Mitochondrial membrane permeabilization in cell death
    • Kroemer, G., Galluzzi, L., Brenner, C., Mitochondrial membrane permeabilization in cell death. Physiol. Rev. 87:1 (2007), 99–163.
    • (2007) Physiol. Rev. , vol.87 , Issue.1 , pp. 99-163
    • Kroemer, G.1    Galluzzi, L.2    Brenner, C.3
  • 20
    • 0032504657 scopus 로고    scopus 로고
    • Role of mitochondria in oxidative stress and ageing
    • Lenaz, G., Role of mitochondria in oxidative stress and ageing. Biochim. Biophys. Acta 1366:1–2 (1998), 53–67.
    • (1998) Biochim. Biophys. Acta , vol.1366 , Issue.1-2 , pp. 53-67
    • Lenaz, G.1
  • 21
    • 49649121681 scopus 로고    scopus 로고
    • Change in iron transporter expression in human term placenta with different maternal iron status
    • Li, Y.Q., Yan, H., Bai, B., Change in iron transporter expression in human term placenta with different maternal iron status. Eur. J. Obstet. Gynecol. Reprod. Biol. 140:1 (2008), 48–54.
    • (2008) Eur. J. Obstet. Gynecol. Reprod. Biol. , vol.140 , Issue.1 , pp. 48-54
    • Li, Y.Q.1    Yan, H.2    Bai, B.3
  • 22
    • 85019899149 scopus 로고    scopus 로고
    • Next-generation superparamagnetic iron oxide nanoparticles for cancer theranostics
    • Li, K., Nejadnik, H., Daldrup-Link, H.E., Next-generation superparamagnetic iron oxide nanoparticles for cancer theranostics. Drug Discov. Today 22:9 (2017), 1421–1429.
    • (2017) Drug Discov. Today , vol.22 , Issue.9 , pp. 1421-1429
    • Li, K.1    Nejadnik, H.2    Daldrup-Link, H.E.3
  • 23
    • 84864296714 scopus 로고    scopus 로고
    • The role of mitochondria in cellular iron-sulfur protein biogenesis and iron metabolism
    • Lill, R., Hoffmann, B., Molik, S., Pierik, A.J., Rietzschel, N., Stehling, O. et al., The role of mitochondria in cellular iron-sulfur protein biogenesis and iron metabolism. Biochim. Biophys. Acta 1823:9 (2012), 1491–1508.
    • (2012) Biochim. Biophys. Acta , vol.1823 , Issue.9 , pp. 1491-1508
    • Lill, R.1    Hoffmann, B.2    Molik, S.3    Pierik, A.J.4    Rietzschel, N.5    Stehling, O.6
  • 24
    • 77951619720 scopus 로고    scopus 로고
    • FDA report: Ferumoxytol for intravenous iron therapy in adult patients with chronic kidney disease
    • Lu, M., Cohen, M.H., Rieves, D., Pazdur, R., FDA report: Ferumoxytol for intravenous iron therapy in adult patients with chronic kidney disease. Am. J. Hematol. 85:5 (2010), 315–319.
    • (2010) Am. J. Hematol. , vol.85 , Issue.5 , pp. 315-319
    • Lu, M.1    Cohen, M.H.2    Rieves, D.3    Pazdur, R.4
  • 25
    • 77952291860 scopus 로고    scopus 로고
    • The effect of carboxydextran-coated superparamagnetic iron oxide nanoparticles on c-Jun N-terminal kinase-mediated apoptosis in human macrophages
    • Lunov, O., Syrovets, T., Buchele, B., Jiang, X., Rocker, C., Tron, K. et al., The effect of carboxydextran-coated superparamagnetic iron oxide nanoparticles on c-Jun N-terminal kinase-mediated apoptosis in human macrophages. Biomaterials 31:19 (2010), 5063–5071.
    • (2010) Biomaterials , vol.31 , Issue.19 , pp. 5063-5071
    • Lunov, O.1    Syrovets, T.2    Buchele, B.3    Jiang, X.4    Rocker, C.5    Tron, K.6
  • 26
    • 79954466823 scopus 로고    scopus 로고
    • Concentration-dependent toxicity of iron oxide nanoparticles mediated by increased oxidative stress
    • Naqvi, S., Samim, M., Abdin, M., Ahmed, F.J., Maitra, A., Prashant, C. et al., Concentration-dependent toxicity of iron oxide nanoparticles mediated by increased oxidative stress. Int. J. Nanomedicine 5 (2010), 983–989.
    • (2010) Int. J. Nanomedicine , vol.5 , pp. 983-989
    • Naqvi, S.1    Samim, M.2    Abdin, M.3    Ahmed, F.J.4    Maitra, A.5    Prashant, C.6
  • 27
  • 29
    • 79960102454 scopus 로고    scopus 로고
    • Non-transferrin bound iron, cytokine activation and intracellular reactive oxygen species generation in hemodialysis patients receiving intravenous iron dextran or iron sucrose
    • Pai, A.B., Conner, T., McQuade, C.R., Olp, J., Hicks, P., Non-transferrin bound iron, cytokine activation and intracellular reactive oxygen species generation in hemodialysis patients receiving intravenous iron dextran or iron sucrose. Biometals 24:4 (2011), 603–613.
    • (2011) Biometals , vol.24 , Issue.4 , pp. 603-613
    • Pai, A.B.1    Conner, T.2    McQuade, C.R.3    Olp, J.4    Hicks, P.5
  • 30
    • 84906063633 scopus 로고    scopus 로고
    • Magnetic iron oxide nanoparticles induce autophagy preceding apoptosis through mitochondrial damage and ER stress in RAW264.7 cells
    • Park, E.J., Choi, D.H., Kim, Y., Lee, E.W., Song, J., Cho, M.H. et al., Magnetic iron oxide nanoparticles induce autophagy preceding apoptosis through mitochondrial damage and ER stress in RAW264.7 cells. Toxicol. in Vitro 28:8 (2014), 1402–1412.
    • (2014) Toxicol. in Vitro , vol.28 , Issue.8 , pp. 1402-1412
    • Park, E.J.1    Choi, D.H.2    Kim, Y.3    Lee, E.W.4    Song, J.5    Cho, M.H.6
  • 31
    • 84944736596 scopus 로고    scopus 로고
    • Chronic pulmonary accumulation of iron oxide nanoparticles induced Th1-type immune response stimulating the function of antigen-presenting cells
    • Park, E.J., Oh, S.Y., Lee, S.J., Lee, K., Kim, Y., Lee, B.S. et al., Chronic pulmonary accumulation of iron oxide nanoparticles induced Th1-type immune response stimulating the function of antigen-presenting cells. Environ. Res. 143:Pt A (2015), 138–147.
    • (2015) Environ. Res. , vol.143 , pp. 138-147
    • Park, E.J.1    Oh, S.Y.2    Lee, S.J.3    Lee, K.4    Kim, Y.5    Lee, B.S.6
  • 32
    • 84872182382 scopus 로고    scopus 로고
    • Mitochondrial pathways, permeability transition pore, and redox signaling in cardioprotection: therapeutic implications
    • Penna, C., Perrelli, M.G., Pagliaro, P., Mitochondrial pathways, permeability transition pore, and redox signaling in cardioprotection: therapeutic implications. Antioxid. Redox Signal. 18:5 (2013), 556–599.
    • (2013) Antioxid. Redox Signal. , vol.18 , Issue.5 , pp. 556-599
    • Penna, C.1    Perrelli, M.G.2    Pagliaro, P.3
  • 33
    • 84870487329 scopus 로고    scopus 로고
    • JC-1: alternative excitation wavelengths facilitate mitochondrial membrane potential cytometry
    • Perelman, A., Wachtel, C., Cohen, M., Haupt, S., Shapiro, H., Tzur, A., JC-1: alternative excitation wavelengths facilitate mitochondrial membrane potential cytometry. Cell Death Dis., 3, 2012, e430.
    • (2012) Cell Death Dis. , vol.3
    • Perelman, A.1    Wachtel, C.2    Cohen, M.3    Haupt, S.4    Shapiro, H.5    Tzur, A.6
  • 34
    • 0025862414 scopus 로고
    • Iron oxide nanoparticles for use as an MRI contrast agent: pharmacokinetics and metabolism
    • Pouliquen, D., Le Jeune, J.J., Perdrisot, R., Ermias, A., Jallet, P., Iron oxide nanoparticles for use as an MRI contrast agent: pharmacokinetics and metabolism. Magn. Reson. Imaging 9:3 (1991), 275–283.
    • (1991) Magn. Reson. Imaging , vol.9 , Issue.3 , pp. 275-283
    • Pouliquen, D.1    Le Jeune, J.J.2    Perdrisot, R.3    Ermias, A.4    Jallet, P.5
  • 35
    • 85028380950 scopus 로고    scopus 로고
    • Transferrin receptor-1 and ferritin heavy and light chains in astrocytic brain tumors: expression and prognostic value
    • Rosager, A.M., Sorensen, M.D., Dahlrot, R.H., Hansen, S., Schonberg, D.L., Rich, J.N. et al., Transferrin receptor-1 and ferritin heavy and light chains in astrocytic brain tumors: expression and prognostic value. PLoS One, 12(8), 2017, e0182954.
    • (2017) PLoS One , vol.12 , Issue.8
    • Rosager, A.M.1    Sorensen, M.D.2    Dahlrot, R.H.3    Hansen, S.4    Schonberg, D.L.5    Rich, J.N.6
  • 36
    • 84964969765 scopus 로고    scopus 로고
    • Effect of surface-modified superparamagnetic iron oxide nanoparticles (SPIONS) on mast cell infiltration: an acute in vivo study
    • Sabareeswaran, A., Ansar, E.B., Harikrishna Varma, P.R., Mohanan, P.V., Kumary, T.V., Effect of surface-modified superparamagnetic iron oxide nanoparticles (SPIONS) on mast cell infiltration: an acute in vivo study. Nanomedicine 12:6 (2016), 1523–1533.
    • (2016) Nanomedicine , vol.12 , Issue.6 , pp. 1523-1533
    • Sabareeswaran, A.1    Ansar, E.B.2    Harikrishna Varma, P.R.3    Mohanan, P.V.4    Kumary, T.V.5
  • 38
    • 85042683283 scopus 로고    scopus 로고
    • Immunological effects of iron oxide nanoparticles and iron-based complex drug formulations: therapeutic benefits, toxicity, mechanistic insights, and translational considerations
    • Shah, A., Dobrovolskaia, M.A., Immunological effects of iron oxide nanoparticles and iron-based complex drug formulations: therapeutic benefits, toxicity, mechanistic insights, and translational considerations. Nanomedicine 14:3 (2018), 977–990.
    • (2018) Nanomedicine , vol.14 , Issue.3 , pp. 977-990
    • Shah, A.1    Dobrovolskaia, M.A.2
  • 39
    • 80155198296 scopus 로고    scopus 로고
    • A single exposure to iron oxide nanoparticles attenuates antigen-specific antibody production and T-cell reactivity in ovalbumin-sensitized BALB/c mice
    • Shen, C.C., Wang, C.C., Liao, M.H., Jan, T.R., A single exposure to iron oxide nanoparticles attenuates antigen-specific antibody production and T-cell reactivity in ovalbumin-sensitized BALB/c mice. Int. J. Nanomedicine 6 (2011), 1229–1235.
    • (2011) Int. J. Nanomedicine , vol.6 , pp. 1229-1235
    • Shen, C.C.1    Wang, C.C.2    Liao, M.H.3    Jan, T.R.4
  • 40
    • 84870325180 scopus 로고    scopus 로고
    • A role of cellular glutathione in the differential effects of iron oxide nanoparticles on antigen-specific T cell cytokine expression
    • Shen, C.C., Liang, H.J., Wang, C.C., Liao, M.H., Jan, T.R., A role of cellular glutathione in the differential effects of iron oxide nanoparticles on antigen-specific T cell cytokine expression. Int. J. Nanomedicine 6 (2011), 2791–2798.
    • (2011) Int. J. Nanomedicine , vol.6 , pp. 2791-2798
    • Shen, C.C.1    Liang, H.J.2    Wang, C.C.3    Liao, M.H.4    Jan, T.R.5
  • 41
    • 84870330660 scopus 로고    scopus 로고
    • Iron oxide nanoparticles suppressed T helper 1 cell-mediated immunity in a murine model of delayed-type hypersensitivity
    • Shen, C.C., Liang, H.J., Wang, C.C., Liao, M.H., Jan, T.R., Iron oxide nanoparticles suppressed T helper 1 cell-mediated immunity in a murine model of delayed-type hypersensitivity. Int. J. Nanomedicine 7 (2012), 2729–2737.
    • (2012) Int. J. Nanomedicine , vol.7 , pp. 2729-2737
    • Shen, C.C.1    Liang, H.J.2    Wang, C.C.3    Liao, M.H.4    Jan, T.R.5
  • 42
    • 84886662830 scopus 로고    scopus 로고
    • Recent advances in surface chemistry strategies for the fabrication of functional iron oxide based magnetic nanoparticles
    • Turcheniuk, K., Tarasevych, A.V., Kukhar, V.P., Boukherroub, R., Szunerits, S., Recent advances in surface chemistry strategies for the fabrication of functional iron oxide based magnetic nanoparticles. Nano 5:22 (2013), 10729–10752.
    • (2013) Nano , vol.5 , Issue.22 , pp. 10729-10752
    • Turcheniuk, K.1    Tarasevych, A.V.2    Kukhar, V.P.3    Boukherroub, R.4    Szunerits, S.5
  • 43
    • 84858863841 scopus 로고    scopus 로고
    • Tissue distribution and histopathological effects of titanium dioxide nanoparticles after intravenous or subcutaneous injection in mice
    • Umbreit, T.H., Francke-Carroll, S., Weaver, J.L., Miller, T.J., Goering, P.L., Sadrieh, N. et al., Tissue distribution and histopathological effects of titanium dioxide nanoparticles after intravenous or subcutaneous injection in mice. J. Appl. Toxicol. 32:5 (2012), 350–357.
    • (2012) J. Appl. Toxicol. , vol.32 , Issue.5 , pp. 350-357
    • Umbreit, T.H.1    Francke-Carroll, S.2    Weaver, J.L.3    Miller, T.J.4    Goering, P.L.5    Sadrieh, N.6
  • 46
    • 84948844132 scopus 로고    scopus 로고
    • Fe2O3 nanoparticles suppress Kv1.3 channels via affecting the redox activity of Kvbeta2 subunit in Jurkat T cells
    • Yan, L., Liu, X., Liu, W.X., Tan, X.Q., Xiong, F., Gu, N. et al., Fe2O3 nanoparticles suppress Kv1.3 channels via affecting the redox activity of Kvbeta2 subunit in Jurkat T cells. Nanotechnology, 26(50), 2015, 505103.
    • (2015) Nanotechnology , vol.26 , Issue.50
    • Yan, L.1    Liu, X.2    Liu, W.X.3    Tan, X.Q.4    Xiong, F.5    Gu, N.6
  • 47
    • 84865544952 scopus 로고    scopus 로고
    • Mitochondrial fission, fusion, and stress
    • Youle, R.J., van der Bliek, A.M., Mitochondrial fission, fusion, and stress. Science 337:6098 (2012), 1062–1065.
    • (2012) Science , vol.337 , Issue.6098 , pp. 1062-1065
    • Youle, R.J.1    van der Bliek, A.M.2
  • 48
    • 79955483910 scopus 로고    scopus 로고
    • Endothelial dysfunction and inflammation induced by iron oxide nanoparticle exposure: risk factors for early atherosclerosis
    • Zhu, M.T., Wang, B., Wang, Y., Yuan, L., Wang, H.J., Wang, M. et al., Endothelial dysfunction and inflammation induced by iron oxide nanoparticle exposure: risk factors for early atherosclerosis. Toxicol. Lett. 203:2 (2011), 162–171.
    • (2011) Toxicol. Lett. , vol.203 , Issue.2 , pp. 162-171
    • Zhu, M.T.1    Wang, B.2    Wang, Y.3    Yuan, L.4    Wang, H.J.5    Wang, M.6


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