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Volumn 12, Issue 1, 2014, Pages 178-193

A complex interplay between PGC-1 co-activators and mTORC1 regulates hematopoietic recovery following 5-fluorouracil treatment

Author keywords

[No Author keywords available]

Indexed keywords

FLUOROURACIL; MAMMALIAN TARGET OF RAPAMYCIN COMPLEX 1; PEROXISOME PROLIFERATOR ACTIVATED RECEPTOR GAMMA COACTIVATOR 1ALPHA; RAPAMYCIN;

EID: 84887602935     PISSN: 18735061     EISSN: 18767753     Source Type: Journal    
DOI: 10.1016/j.scr.2013.10.006     Document Type: Article
Times cited : (12)

References (49)
  • 1
    • 0035016566 scopus 로고    scopus 로고
    • Pgc-1-related coactivator, a novel, serum-inducible coactivator of nuclear respiratory factor 1-dependent transcription in mammalian cells
    • Andersson U., Scarpulla R.C. Pgc-1-related coactivator, a novel, serum-inducible coactivator of nuclear respiratory factor 1-dependent transcription in mammalian cells. Mol. Cell. Biol. 2001, 21:3738-3749.
    • (2001) Mol. Cell. Biol. , vol.21 , pp. 3738-3749
    • Andersson, U.1    Scarpulla, R.C.2
  • 2
    • 0033083310 scopus 로고    scopus 로고
    • Elevation of mitochondrial transmembrane potential and reactive oxygen intermediate levels are early events and occur independently from activation of caspases in Fas signaling
    • Banki K., Hutter E., Gonchoroff N.J., Perl A. Elevation of mitochondrial transmembrane potential and reactive oxygen intermediate levels are early events and occur independently from activation of caspases in Fas signaling. J. Immunol. 1999, 162:1466-1479.
    • (1999) J. Immunol. , vol.162 , pp. 1466-1479
    • Banki, K.1    Hutter, E.2    Gonchoroff, N.J.3    Perl, A.4
  • 3
    • 22144487405 scopus 로고    scopus 로고
    • + cord blood cells to stromal cell-derived factor-1/CXCL12
    • + cord blood cells to stromal cell-derived factor-1/CXCL12. Blood 2005, 106:485-493.
    • (2005) Blood , vol.106 , pp. 485-493
    • Basu, S.1    Broxmeyer, H.E.2
  • 4
    • 84878080889 scopus 로고    scopus 로고
    • Peroxisome proliferator-activated-gamma coactivator-1alpha-mediated mitochondrial biogenesis is important for hematopoietic recovery in response to stress
    • Basu S., Broxmeyer H.E., Hangoc G. Peroxisome proliferator-activated-gamma coactivator-1alpha-mediated mitochondrial biogenesis is important for hematopoietic recovery in response to stress. Stem Cells Dev. 2013, 22:1678-1692.
    • (2013) Stem Cells Dev. , vol.22 , pp. 1678-1692
    • Basu, S.1    Broxmeyer, H.E.2    Hangoc, G.3
  • 5
    • 10044276783 scopus 로고    scopus 로고
    • Regulation of mTOR function in response to hypoxia by REDD1 and the TSC1/TSC2 tumor suppressor complex
    • Brugarolas J., Lei K., Hurley R.L., et al. Regulation of mTOR function in response to hypoxia by REDD1 and the TSC1/TSC2 tumor suppressor complex. Genes Dev. 2004, 18:2893-2904.
    • (2004) Genes Dev. , vol.18 , pp. 2893-2904
    • Brugarolas, J.1    Lei, K.2    Hurley, R.L.3
  • 6
    • 0000535911 scopus 로고
    • Localization and kinetics of reduced pyridine nucleotide in living cells by microfluorometry
    • Chance B., Thorell B. Localization and kinetics of reduced pyridine nucleotide in living cells by microfluorometry. J. Biol. Chem. 1959, 234:3044-3050.
    • (1959) J. Biol. Chem. , vol.234 , pp. 3044-3050
    • Chance, B.1    Thorell, B.2
  • 7
    • 53349091768 scopus 로고    scopus 로고
    • TSC-mTOR maintains quiescence and function of hematopoietic stem cells by repressing mitochondrial biogenesis and reactive oxygen species
    • Chen C., Liu Y., Liu R., et al. TSC-mTOR maintains quiescence and function of hematopoietic stem cells by repressing mitochondrial biogenesis and reactive oxygen species. J. Exp. Med. 2008, 205:2397-2408.
    • (2008) J. Exp. Med. , vol.205 , pp. 2397-2408
    • Chen, C.1    Liu, Y.2    Liu, R.3
  • 8
    • 70349123829 scopus 로고    scopus 로고
    • The tumor suppressor p53 regulates polarity of self-renewing divisions in mammary stem cells
    • Cicalese A., Bonizzi G., Pasi C.E., et al. The tumor suppressor p53 regulates polarity of self-renewing divisions in mammary stem cells. Cell 2009, 138:1083-1095.
    • (2009) Cell , vol.138 , pp. 1083-1095
    • Cicalese, A.1    Bonizzi, G.2    Pasi, C.E.3
  • 9
    • 0010638278 scopus 로고    scopus 로고
    • Flow cytometric analysis of mitochondrial membrane potential using JC-1
    • Cossarizza A., Salvioli S. Flow cytometric analysis of mitochondrial membrane potential using JC-1. Curr. Protoc. Cytom. 2001, 13:9.14.1-9.14.7.
    • (2001) Curr. Protoc. Cytom. , vol.13
    • Cossarizza, A.1    Salvioli, S.2
  • 10
    • 0035798097 scopus 로고    scopus 로고
    • Mammalian TOR: a homeostatic ATP sensor
    • Dennis P.B., Jaeschke A., Saitoh M., et al. Mammalian TOR: a homeostatic ATP sensor. Science 2001, 294:1102-1105.
    • (2001) Science , vol.294 , pp. 1102-1105
    • Dennis, P.B.1    Jaeschke, A.2    Saitoh, M.3
  • 11
    • 0036863624 scopus 로고    scopus 로고
    • REDD1, a developmentally regulated transcriptional target of p63 and p53, links p63 to regulation of reactive oxygen species
    • Ellisen L.W., Ramsayer K.D., Johannessen C.M., et al. REDD1, a developmentally regulated transcriptional target of p63 and p53, links p63 to regulation of reactive oxygen species. Mol. Cell 2002, 10:995-1005.
    • (2002) Mol. Cell , vol.10 , pp. 995-1005
    • Ellisen, L.W.1    Ramsayer, K.D.2    Johannessen, C.M.3
  • 12
    • 2342545519 scopus 로고    scopus 로고
    • Target of rapamycin (TOR): an integrator of nutrient and growth factor signals and coordinator of cell growth and cell cycle progression
    • Fingar D.C., Blenis J. Target of rapamycin (TOR): an integrator of nutrient and growth factor signals and coordinator of cell growth and cell cycle progression. Oncogene 2004, 23:3151-3171.
    • (2004) Oncogene , vol.23 , pp. 3151-3171
    • Fingar, D.C.1    Blenis, J.2
  • 13
    • 78649874959 scopus 로고    scopus 로고
    • Lkb1 regulates quiescence and metabolic homeostasis of haematopoietic stem cells
    • Gan B., Hu J., Jiang S., et al. Lkb1 regulates quiescence and metabolic homeostasis of haematopoietic stem cells. Nature 2010, 468:701-704.
    • (2010) Nature , vol.468 , pp. 701-704
    • Gan, B.1    Hu, J.2    Jiang, S.3
  • 14
    • 0018076447 scopus 로고
    • Sensitivity of corticosteroid-dependent insulin-resistant lipogenesis in marrow preadipocytes of obese-diabetic (db/db) mice
    • Greenberger J.S. Sensitivity of corticosteroid-dependent insulin-resistant lipogenesis in marrow preadipocytes of obese-diabetic (db/db) mice. Nature 1978, 275:752-754.
    • (1978) Nature , vol.275 , pp. 752-754
    • Greenberger, J.S.1
  • 15
    • 78649851511 scopus 로고    scopus 로고
    • The Lkb1 metabolic sensor maintains haematopoietic stem cell survival
    • Gurumurthy S., Xie S.Z., Alagesan B., et al. The Lkb1 metabolic sensor maintains haematopoietic stem cell survival. Nature 2010, 468:659-663.
    • (2010) Nature , vol.468 , pp. 659-663
    • Gurumurthy, S.1    Xie, S.Z.2    Alagesan, B.3
  • 16
    • 84862995649 scopus 로고    scopus 로고
    • Mechanism of activation of AMPK and upregulation of OGG1 by rapamycin in cancer cells
    • Habib S.L. Mechanism of activation of AMPK and upregulation of OGG1 by rapamycin in cancer cells. Oncotarget 2011, 2:958-959.
    • (2011) Oncotarget , vol.2 , pp. 958-959
    • Habib, S.L.1
  • 17
    • 77951250700 scopus 로고    scopus 로고
    • Oligomycin-induced bioenergetic adaptation in cancer cells with heterogeneous bioenergetic organization
    • Hao W., Chang C.P., Tsao C.C., Xu J. Oligomycin-induced bioenergetic adaptation in cancer cells with heterogeneous bioenergetic organization. J. Biol. Chem. 2010, 285:12647-12654.
    • (2010) J. Biol. Chem. , vol.285 , pp. 12647-12654
    • Hao, W.1    Chang, C.P.2    Tsao, C.C.3    Xu, J.4
  • 18
    • 0031717105 scopus 로고    scopus 로고
    • The AMP-activated/SNF1 protein kinase subfamily: metabolic sensors of the eukaryotic cell?
    • Hardie D.G., Carling D., Carlson M. The AMP-activated/SNF1 protein kinase subfamily: metabolic sensors of the eukaryotic cell?. Annu. Rev. Biochem. 1998, 67:821-855.
    • (1998) Annu. Rev. Biochem. , vol.67 , pp. 821-855
    • Hardie, D.G.1    Carling, D.2    Carlson, M.3
  • 19
    • 0025992197 scopus 로고
    • Most primitive hematopoietic stem cells are stimulated to cycle rapidly after treatment with 5-fluorouracil
    • Harrison D.E., Lerner C.P. Most primitive hematopoietic stem cells are stimulated to cycle rapidly after treatment with 5-fluorouracil. Blood 1991, 78:1237-1240.
    • (1991) Blood , vol.78 , pp. 1237-1240
    • Harrison, D.E.1    Lerner, C.P.2
  • 20
    • 4043171462 scopus 로고    scopus 로고
    • Upstream and downstream of mTOR
    • Hay N., Sonenberg N. Upstream and downstream of mTOR. Genes Dev. 2004, 18:1926-1945.
    • (2004) Genes Dev. , vol.18 , pp. 1926-1945
    • Hay, N.1    Sonenberg, N.2
  • 21
    • 18444389451 scopus 로고    scopus 로고
    • Recruitment of stem and progenitor cells from the bone marrow niche requires MMP-9 mediated release of kit-ligand
    • Heissig B., Hattori K., Dias S., et al. Recruitment of stem and progenitor cells from the bone marrow niche requires MMP-9 mediated release of kit-ligand. Cell 2002, 109:625-637.
    • (2002) Cell , vol.109 , pp. 625-637
    • Heissig, B.1    Hattori, K.2    Dias, S.3
  • 22
    • 0018655416 scopus 로고
    • Properties of haematopoietic stem cells surviving 5-fluorouracil treatment: evidence for a pre-CFU-S cell?
    • Hodgson G.S., Bradley T.R. Properties of haematopoietic stem cells surviving 5-fluorouracil treatment: evidence for a pre-CFU-S cell?. Nature 1979, 281:381-382.
    • (1979) Nature , vol.281 , pp. 381-382
    • Hodgson, G.S.1    Bradley, T.R.2
  • 23
    • 0025790448 scopus 로고
    • Effects of recombinant transforming growth factor-beta 1 on hematologic recovery after treatment of mice with 5-fluorouracil
    • Jansen R., Damia G., Usui N., et al. Effects of recombinant transforming growth factor-beta 1 on hematologic recovery after treatment of mice with 5-fluorouracil. J. Immunol. 1991, 147:3342-3347.
    • (1991) J. Immunol. , vol.147 , pp. 3342-3347
    • Jansen, R.1    Damia, G.2    Usui, N.3
  • 24
    • 56849127197 scopus 로고    scopus 로고
    • Flow-cytometric phosphoprotein analysis reveals agonist and temporal differences in responses of murine hematopoietic stem/progenitor cells
    • Kalaitzidis D., Neel B.G. Flow-cytometric phosphoprotein analysis reveals agonist and temporal differences in responses of murine hematopoietic stem/progenitor cells. PLoS One 2008, 3:e3776.
    • (2008) PLoS One , vol.3
    • Kalaitzidis, D.1    Neel, B.G.2
  • 25
    • 1542373685 scopus 로고    scopus 로고
    • Transcriptional regulatory circuits controlling mitochondrial biogenesis and function
    • Kelly D.P., Scarpulla R.C. Transcriptional regulatory circuits controlling mitochondrial biogenesis and function. Genes Dev. 2004, 18:357-368.
    • (2004) Genes Dev. , vol.18 , pp. 357-368
    • Kelly, D.P.1    Scarpulla, R.C.2
  • 26
    • 22144473344 scopus 로고    scopus 로고
    • Tie2 activation contributes to hemangiogenic regeneration after myelosuppression
    • Kopp H.G., Avecilla S.T., Hooper A.T., et al. Tie2 activation contributes to hemangiogenic regeneration after myelosuppression. Blood 2005, 106:505-513.
    • (2005) Blood , vol.106 , pp. 505-513
    • Kopp, H.G.1    Avecilla, S.T.2    Hooper, A.T.3
  • 27
    • 70350418625 scopus 로고    scopus 로고
    • MTOR signaling at a glance
    • Laplante M., Sabatini D.M. mTOR signaling at a glance. J. Cell Sci. 2009, 122:3589-3594.
    • (2009) J. Cell Sci. , vol.122 , pp. 3589-3594
    • Laplante, M.1    Sabatini, D.M.2
  • 28
    • 0031930319 scopus 로고    scopus 로고
    • Mitochondrial transcription factor A is necessary for mtDNA maintenance and embryogenesis in mice
    • Larsson N.G., Wang J., Wilhelmsson H., et al. Mitochondrial transcription factor A is necessary for mtDNA maintenance and embryogenesis in mice. Nat. Genet. 1998, 18:231-236.
    • (1998) Nat. Genet. , vol.18 , pp. 231-236
    • Larsson, N.G.1    Wang, J.2    Wilhelmsson, H.3
  • 29
    • 78049496814 scopus 로고    scopus 로고
    • MTOR activation induces tumor suppressors that inhibit leukemogenesis and deplete hematopoietic stem cells after Pten deletion
    • Lee J.Y., Nakada D., Yilmaz O.H., et al. mTOR activation induces tumor suppressors that inhibit leukemogenesis and deplete hematopoietic stem cells after Pten deletion. Cell Stem Cell 2010, 7:593-605.
    • (2010) Cell Stem Cell , vol.7 , pp. 593-605
    • Lee, J.Y.1    Nakada, D.2    Yilmaz, O.H.3
  • 30
    • 0025138652 scopus 로고
    • 5-Fluorouracil spares hemopoietic stem cells responsible for long-term repopulation
    • Lerner C., Harrison D.E. 5-Fluorouracil spares hemopoietic stem cells responsible for long-term repopulation. Exp. Hematol. 1990, 18:114-118.
    • (1990) Exp. Hematol. , vol.18 , pp. 114-118
    • Lerner, C.1    Harrison, D.E.2
  • 31
    • 79952728102 scopus 로고    scopus 로고
    • The autophagy protein Atg7 is essential for hematopoietic stem cell maintenance
    • Mortensen M., Soilleux E.J., Djordjevic G., et al. The autophagy protein Atg7 is essential for hematopoietic stem cell maintenance. J. Exp. Med. 2011, 208:455-467.
    • (2011) J. Exp. Med. , vol.208 , pp. 455-467
    • Mortensen, M.1    Soilleux, E.J.2    Djordjevic, G.3
  • 32
    • 0036863086 scopus 로고    scopus 로고
    • Regulation of mammalian acetyl-CoA carboxylase
    • Munday M.R. Regulation of mammalian acetyl-CoA carboxylase. Biochem. Soc. Trans. 2002, 30:1059-1064.
    • (2002) Biochem. Soc. Trans. , vol.30 , pp. 1059-1064
    • Munday, M.R.1
  • 33
    • 78649811793 scopus 로고    scopus 로고
    • Lkb1 regulates cell cycle and energy metabolism in haematopoietic stem cells
    • Nakada D., Saunders T.L., Morrison S.J. Lkb1 regulates cell cycle and energy metabolism in haematopoietic stem cells. Nature 2010, 468:653-658.
    • (2010) Nature , vol.468 , pp. 653-658
    • Nakada, D.1    Saunders, T.L.2    Morrison, S.J.3
  • 34
    • 0027186186 scopus 로고
    • Age-dependent modifications of mitochondrial trans-membrane potential and mass in rat splenic lymphocytes during proliferation
    • Pieri C., Recchioni R., Moroni F. Age-dependent modifications of mitochondrial trans-membrane potential and mass in rat splenic lymphocytes during proliferation. Mech. Ageing Dev. 1993, 70:201-212.
    • (1993) Mech. Ageing Dev. , vol.70 , pp. 201-212
    • Pieri, C.1    Recchioni, R.2    Moroni, F.3
  • 35
    • 0037326196 scopus 로고    scopus 로고
    • Peroxisome proliferator-activated receptor-gamma coactivator 1 alpha (PGC-1 alpha): transcriptional coactivator and metabolic regulator
    • Puigserver P., Spiegelman B.M. Peroxisome proliferator-activated receptor-gamma coactivator 1 alpha (PGC-1 alpha): transcriptional coactivator and metabolic regulator. Endocr. Rev. 2003, 24:78-90.
    • (2003) Endocr. Rev. , vol.24 , pp. 78-90
    • Puigserver, P.1    Spiegelman, B.M.2
  • 36
    • 0030927503 scopus 로고    scopus 로고
    • Phenotypic and functional changes induced at the clonal level in hematopoietic stem cells after 5-fluorouracil treatment
    • Randall T.D., Weissman I.L. Phenotypic and functional changes induced at the clonal level in hematopoietic stem cells after 5-fluorouracil treatment. Blood 1997, 89:3596-3606.
    • (1997) Blood , vol.89 , pp. 3596-3606
    • Randall, T.D.1    Weissman, I.L.2
  • 37
    • 10044276784 scopus 로고    scopus 로고
    • The hypoxia-induced paralogs Scylla and Charybdis inhibit growth by down-regulating S6K activity upstream of TSC in Drosophila
    • Reiling J.H., Hafen E. The hypoxia-induced paralogs Scylla and Charybdis inhibit growth by down-regulating S6K activity upstream of TSC in Drosophila. Genes Dev. 2004, 18:2879-2892.
    • (2004) Genes Dev. , vol.18 , pp. 2879-2892
    • Reiling, J.H.1    Hafen, E.2
  • 38
    • 0025910667 scopus 로고
    • The effect of 5-fluorouracil on erythropoiesis
    • Rich I.N. The effect of 5-fluorouracil on erythropoiesis. Blood 1991, 77:1164-1170.
    • (1991) Blood , vol.77 , pp. 1164-1170
    • Rich, I.N.1
  • 39
    • 0032857031 scopus 로고    scopus 로고
    • Reversible expression of CD34 by murine hematopoietic stem cells
    • Sato T., Laver J.H., Ogawa M. Reversible expression of CD34 by murine hematopoietic stem cells. Blood 1999, 94:2548-2554.
    • (1999) Blood , vol.94 , pp. 2548-2554
    • Sato, T.1    Laver, J.H.2    Ogawa, M.3
  • 40
    • 0037029049 scopus 로고    scopus 로고
    • Transcriptional activators and coactivators in the nuclear control of mitochondrial function in mammalian cells
    • Scarpulla R.C. Transcriptional activators and coactivators in the nuclear control of mitochondrial function in mammalian cells. Gene 2002, 286:81-89.
    • (2002) Gene , vol.286 , pp. 81-89
    • Scarpulla, R.C.1
  • 41
    • 42049114034 scopus 로고    scopus 로고
    • Transcriptional paradigms in mammalian mitochondrial biogenesis and function
    • Scarpulla R.C. Transcriptional paradigms in mammalian mitochondrial biogenesis and function. Physiol. Rev. 2008, 88:611-638.
    • (2008) Physiol. Rev. , vol.88 , pp. 611-638
    • Scarpulla, R.C.1
  • 42
    • 78649348967 scopus 로고    scopus 로고
    • Regulation of the mTOR complex 1 pathway by nutrients, growth factors, and stress
    • Sengupta S., Peterson T.R., Sabatini D.M. Regulation of the mTOR complex 1 pathway by nutrients, growth factors, and stress. Mol. Cell 2010, 40:310-322.
    • (2010) Mol. Cell , vol.40 , pp. 310-322
    • Sengupta, S.1    Peterson, T.R.2    Sabatini, D.M.3
  • 43
    • 77956205122 scopus 로고    scopus 로고
    • The distinct metabolic profile of hematopoietic stem cells reflects their location in a hypoxic niche
    • Simsek T., Kocabas F., Zheng J., et al. The distinct metabolic profile of hematopoietic stem cells reflects their location in a hypoxic niche. Cell Stem Cell 2010, 7:380-390.
    • (2010) Cell Stem Cell , vol.7 , pp. 380-390
    • Simsek, T.1    Kocabas, F.2    Zheng, J.3
  • 44
    • 0025806764 scopus 로고
    • Intracellular heterogeneity in mitochondrial membrane potentials revealed by a J-aggregate-forming lipophilic cation JC-1
    • Smiley S.T., Reers M., Mottola-Hartshorn C., et al. Intracellular heterogeneity in mitochondrial membrane potentials revealed by a J-aggregate-forming lipophilic cation JC-1. Proc. Natl. Acad. Sci. U. S. A. 1991, 88:3671-3675.
    • (1991) Proc. Natl. Acad. Sci. U. S. A. , vol.88 , pp. 3671-3675
    • Smiley, S.T.1    Reers, M.2    Mottola-Hartshorn, C.3
  • 45
    • 21744459535 scopus 로고    scopus 로고
    • Regulation of mTOR and cell growth in response to energy stress by REDD1
    • Sofer A., Lei K., Johannessen C.M., Ellisen L.W. Regulation of mTOR and cell growth in response to energy stress by REDD1. Mol. Cell. Biol. 2005, 25:5834-5845.
    • (2005) Mol. Cell. Biol. , vol.25 , pp. 5834-5845
    • Sofer, A.1    Lei, K.2    Johannessen, C.M.3    Ellisen, L.W.4
  • 46
    • 77956217067 scopus 로고    scopus 로고
    • Regulation of the HIF-1alpha level is essential for hematopoietic stem cells
    • Takubo K., Goda N., Yamada W., et al. Regulation of the HIF-1alpha level is essential for hematopoietic stem cells. Cell Stem Cell 2010, 7:391-402.
    • (2010) Cell Stem Cell , vol.7 , pp. 391-402
    • Takubo, K.1    Goda, N.2    Yamada, W.3
  • 47
    • 33646124709 scopus 로고    scopus 로고
    • Complementary action of the PGC-1 coactivators in mitochondrial biogenesis and brown fat differentiation
    • Uldry M., Yang W., St-Pierre J., et al. Complementary action of the PGC-1 coactivators in mitochondrial biogenesis and brown fat differentiation. Cell Metab. 2006, 3:333-341.
    • (2006) Cell Metab. , vol.3 , pp. 333-341
    • Uldry, M.1    Yang, W.2    St-Pierre, J.3
  • 48
    • 56549128268 scopus 로고    scopus 로고
    • Hematopoietic stem cells reversibly switch from dormancy to self-renewal during homeostasis and repair
    • Wilson A., Laurenti E., Oser G., et al. Hematopoietic stem cells reversibly switch from dormancy to self-renewal during homeostasis and repair. Cell 2008, 135:1118-1129.
    • (2008) Cell , vol.135 , pp. 1118-1129
    • Wilson, A.1    Laurenti, E.2    Oser, G.3
  • 49
    • 31544481865 scopus 로고    scopus 로고
    • SLAM family markers are conserved among hematopoietic stem cells from old and reconstituted mice and markedly increase their purity
    • Yilmaz O.H., Kiel M.J., Morrison S.J. SLAM family markers are conserved among hematopoietic stem cells from old and reconstituted mice and markedly increase their purity. Blood 2006, 107:924-930.
    • (2006) Blood , vol.107 , pp. 924-930
    • Yilmaz, O.H.1    Kiel, M.J.2    Morrison, S.J.3


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