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Volumn 2, Issue 9, 2006, Pages 527-534

Mechanisms of disease: Cytokine and adipokine signaling in uremic cachexia

Author keywords

Inflammation; Leptin; Melanocortin; Nutrition; Uremia

Indexed keywords

ADIPOCYTOKINE; ADIPONECTIN; AGOUTI RELATED PROTEIN; CYTOKINE; GHRELIN; LEPTIN; MELANOCORTIN; RESISTIN;

EID: 33748331209     PISSN: 17458323     EISSN: 17458331     Source Type: Journal    
DOI: 10.1038/ncpneph0273     Document Type: Review
Times cited : (62)

References (57)
  • 1
    • 12244252225 scopus 로고    scopus 로고
    • Cardiac disease in young adult patients with end-stage renal disease since childhood: A Dutch cohort study
    • Gruppen MP et al. (2003) Cardiac disease in young adult patients with end-stage renal disease since childhood: a Dutch cohort study. Kidney Int 63: 1058-1065
    • (2003) Kidney Int , vol.63 , pp. 1058-1065
    • Gruppen, M.P.1
  • 2
    • 0034079643 scopus 로고    scopus 로고
    • Cardiovascular disease and chronic renal disease: A new paradigm
    • Sarnak MJ and Levey AS (2000) Cardiovascular disease and chronic renal disease: a new paradigm. Am J Kidney Dis 35: S117-S131
    • (2000) Am J Kidney Dis , vol.35
    • Sarnak, M.J.1    Levey, A.S.2
  • 3
    • 0029085527 scopus 로고
    • Cross-sectional comparison of malnutrition in continuous ambulatory peritoneal dialysis and hemodialysis patients
    • Cianciaruso B et al. (1995) Cross-sectional comparison of malnutrition in continuous ambulatory peritoneal dialysis and hemodialysis patients. Am J Kidney Dis 26: 475-486
    • (1995) Am J Kidney Dis , vol.26 , pp. 475-486
    • Cianciaruso, B.1
  • 4
    • 0030665384 scopus 로고    scopus 로고
    • Biology of cachexia
    • Tisdale MJ (1997) Biology of cachexia. J Natl Cancer Inst 89: 1763-1773
    • (1997) J Natl Cancer Inst , vol.89 , pp. 1763-1773
    • Tisdale, M.J.1
  • 5
    • 0024446834 scopus 로고
    • Magnitude of body-cell-mass depletion and the timing of death from wasting in AIDS
    • Kotler DP et al. (1989) Magnitude of body-cell-mass depletion and the timing of death from wasting in AIDS. Am J Clin Nutr 50: 444-447
    • (1989) Am J Clin Nutr , vol.50 , pp. 444-447
    • Kotler, D.P.1
  • 6
    • 0024365383 scopus 로고
    • Anticachectin/tumor necrosis factor-alpha antibodies attenuate development of cachexia in tumor models
    • Sherry BA et al. (1989) Anticachectin/tumor necrosis factor-alpha antibodies attenuate development of cachexia in tumor models. FASEB J 3: 1956-1962
    • (1989) FASEB J , vol.3 , pp. 1956-1962
    • Sherry, B.A.1
  • 7
    • 0000498853 scopus 로고
    • Cachectin/TNF or IL-1 alpha induces cachexia with redistribution of body proteins
    • Fong Y et al. (1989) Cachectin/TNF or IL-1 alpha induces cachexia with redistribution of body proteins. Am J Physiol 256: R659-665
    • (1989) Am J Physiol , vol.256
    • Fong, Y.1
  • 8
    • 0030249710 scopus 로고    scopus 로고
    • Anorexia induced by chronic central administration of cytokines at estimated pathophysiological concentrations
    • Plata-Salaman CR et al. (1996) Anorexia induced by chronic central administration of cytokines at estimated pathophysiological concentrations. Physiol Behav 60: 867-875
    • (1996) Physiol Behav , vol.60 , pp. 867-875
    • Plata-Salaman, C.R.1
  • 9
    • 0000703890 scopus 로고
    • The treatment of chronic uremia by means of intermittent hemodialysis: A preliminary report
    • Scribner BH et al. (1960) The treatment of chronic uremia by means of intermittent hemodialysis: a preliminary report. Trans Am Soc Artif Intern Organs 6: 114-122
    • (1960) Trans Am Soc Artif Intern Organs , vol.6 , pp. 114-122
    • Scribner, B.H.1
  • 10
    • 0030358038 scopus 로고    scopus 로고
    • Middle-sized molecule fractions isolated from uremic ultrafiltrate and normal urine inhibit ingestive behavior in the rat
    • Anderstam B et al. (1996) Middle-sized molecule fractions isolated from uremic ultrafiltrate and normal urine inhibit ingestive behavior in the rat. J Am Soc Nephrol 7: 2453-2460
    • (1996) J Am Soc Nephrol , vol.7 , pp. 2453-2460
    • Anderstam, B.1
  • 11
    • 0345004815 scopus 로고    scopus 로고
    • Evidence of splanchnic-brain signaling in inhibition of ingestive behavior by middle molecules
    • Mamoun AH et al. (1999) Evidence of splanchnic-brain signaling in inhibition of ingestive behavior by middle molecules. J Am Soc Nephrol 10: 309-314
    • (1999) J Am Soc Nephrol , vol.10 , pp. 309-314
    • Mamoun, A.H.1
  • 12
    • 18644377770 scopus 로고    scopus 로고
    • Chronic kidney disease and inflammation in pediatric patients: From bench to playground
    • Pecoits-Filho R et al. (2005) Chronic kidney disease and inflammation in pediatric patients: from bench to playground. Pediatr Nephrol 20: 714-720
    • (2005) Pediatr Nephrol , vol.20 , pp. 714-720
    • Pecoits-Filho, R.1
  • 13
    • 0043128823 scopus 로고    scopus 로고
    • Association between inflammatory mediators and muscle mass in long-term hemodialysis patients
    • Kaizu Y et al. (2003) Association between inflammatory mediators and muscle mass in long-term hemodialysis patients. Am J Kidney Dis 42: 295-302
    • (2003) Am J Kidney Dis , vol.42 , pp. 295-302
    • Kaizu, Y.1
  • 14
    • 0031808267 scopus 로고    scopus 로고
    • Interleukin-6 predicts hypoalbuminemia, hypocholesterolemia, and mortality in hemodialysis patients
    • Bologa RM et al. (1998) Interleukin-6 predicts hypoalbuminemia, hypocholesterolemia, and mortality in hemodialysis patients. Am J Kidney Dis 32: 107-114
    • (1998) Am J Kidney Dis , vol.32 , pp. 107-114
    • Bologa, R.M.1
  • 15
    • 0028201322 scopus 로고
    • Interleukin-6 induces skeletal muscle protein breakdown in rats
    • Goodman MN (1994) Interleukin-6 induces skeletal muscle protein breakdown in rats. Proc Soc Exp Biol Med 205: 182-185
    • (1994) Proc Soc Exp Biol Med , vol.205 , pp. 182-185
    • Goodman, M.N.1
  • 16
    • 13344261948 scopus 로고    scopus 로고
    • Interleukin 6 receptor antibody inhibits muscle atrophy and modulates proteolytic systems in interleukin 6 transgenic mice
    • Tsujinaka T et al. (1996) Interleukin 6 receptor antibody inhibits muscle atrophy and modulates proteolytic systems in interleukin 6 transgenic mice. J Clin Invest 97: 244-249
    • (1996) J Clin Invest , vol.97 , pp. 244-249
    • Tsujinaka, T.1
  • 17
    • 0031801970 scopus 로고    scopus 로고
    • Anorexigen (TNF alpha, cholecystokinin) and orexigen (neuropeptide Y) in peritoneal dialysis patients. Their relationship with nutritional parameters
    • Aguilera A et al. (1998) Anorexigen (TNF alpha, cholecystokinin) and orexigen (neuropeptide Y) in peritoneal dialysis patients. Their relationship with nutritional parameters. Nephrol Dial Transplant 13: 1476-1483
    • (1998) Nephrol Dial Transplant , vol.13 , pp. 1476-1483
    • Aguilera, A.1
  • 18
    • 0034730251 scopus 로고    scopus 로고
    • NF-κB induced loss of MyoD messenger RNA: Possible role in muscle decay and cachexia
    • Guttridge DC et al. (2000) NF-κB induced loss of MyoD messenger RNA: Possible role in muscle decay and cachexia. Science 289: 2363-2365
    • (2000) Science , vol.289 , pp. 2363-2365
    • Guttridge, D.C.1
  • 19
    • 0031892756 scopus 로고    scopus 로고
    • Cytokines and anorexia: A brief overview
    • Plata-Salaman CR (1998) Cytokines and anorexia: a brief overview. Semin Oncol 25: 4-11
    • (1998) Semin Oncol , vol.25 , pp. 4-11
    • Plata-Salaman, C.R.1
  • 20
    • 0037043534 scopus 로고    scopus 로고
    • Obesity: Keeping hunger at bay
    • Schwartz MW and Morton GJ (2002) Obesity: Keeping hunger at bay. Nature 418: 595-597
    • (2002) Nature , vol.418 , pp. 595-597
    • Schwartz, M.W.1    Morton, G.J.2
  • 22
    • 0029073613 scopus 로고
    • Weight-reducing effects of plasma protein encoded by the obese gene
    • Halaas J et al. (1995) Weight-reducing effects of plasma protein encoded by the obese gene. Science 269: 543-549
    • (1995) Science , vol.269 , pp. 543-549
    • Halaas, J.1
  • 23
    • 8244232511 scopus 로고    scopus 로고
    • Plasma leptin is partly cleared by the kidney and is elevated in hemodialysis patients
    • Sharma K et al. (1997) Plasma leptin is partly cleared by the kidney and is elevated in hemodialysis patients. Kidney Int 51: 1980-1985
    • (1997) Kidney Int , vol.51 , pp. 1980-1985
    • Sharma, K.1
  • 24
    • 0034042923 scopus 로고    scopus 로고
    • Increases in serum leptin during peritoneal dialysis are associated with inflammation and a decrease in lean body mass
    • Stenvinkel P et al. (2000) Increases in serum leptin during peritoneal dialysis are associated with inflammation and a decrease in lean body mass. J Am Soc Nephrol 11: 1303-1309
    • (2000) J Am Soc Nephrol , vol.11 , pp. 1303-1309
    • Stenvinkel, P.1
  • 25
    • 0344588820 scopus 로고    scopus 로고
    • Inappropriate elevation of serum leptin in children with chronic renal failure
    • European Study Group for Nutritional Treatment of Chronic Renal Failure in Chilhood
    • Daschner M et al. (1998) Inappropriate elevation of serum leptin in children with chronic renal failure. European Study Group for Nutritional Treatment of Chronic Renal Failure in Chilhood. J Am Soc Nephrol 9: 1074-1079
    • (1998) J Am Soc Nephrol , vol.9 , pp. 1074-1079
    • Daschner, M.1
  • 26
    • 0036144209 scopus 로고    scopus 로고
    • Leptin and renal disease
    • Wolf G et al. (2002) Leptin and renal disease. Am J Kidney Dis 39: 1-11
    • (2002) Am J Kidney Dis , vol.39 , pp. 1-11
    • Wolf, G.1
  • 27
    • 23744433912 scopus 로고    scopus 로고
    • Adipokines in chronic kidney disease - Fat tissue gives nephrologists a message
    • Heimburger O and Stenvinkel P (2005) Adipokines in chronic kidney disease - fat tissue gives nephrologists a message. Perit Dial Int 25: 340-342
    • (2005) Perit Dial Int , vol.25 , pp. 340-342
    • Heimburger, O.1    Stenvinkel, P.2
  • 28
    • 2442659256 scopus 로고    scopus 로고
    • Adiponectin acts in the brain to decrease body weight
    • Qi Y et al. (2004) Adiponectin acts in the brain to decrease body weight. Nature Med 10: 524-529
    • (2004) Nature Med , vol.10 , pp. 524-529
    • Qi, Y.1
  • 29
    • 31544435794 scopus 로고    scopus 로고
    • Elevated resistin levels in chronic kidney disease are associated with decreased glomerular filtration rate and inflammation, but not with insulin resistance
    • Axelsson J et al. (2006) Elevated resistin levels in chronic kidney disease are associated with decreased glomerular filtration rate and inflammation, but not with insulin resistance. Kidney Int 69: 596-604
    • (2006) Kidney Int , vol.69 , pp. 596-604
    • Axelsson, J.1
  • 30
    • 0036875566 scopus 로고    scopus 로고
    • Weight loss in tumour-bearing mice is not associated with changes in resistin gene expression in white adipose tissue
    • Gomez-Ambrosi J et al. (2002) Weight loss in tumour-bearing mice is not associated with changes in resistin gene expression in white adipose tissue. Horm Metab Res 34: 674-677
    • (2002) Horm Metab Res , vol.34 , pp. 674-677
    • Gomez-Ambrosi, J.1
  • 31
    • 24144459843 scopus 로고    scopus 로고
    • Regulation of fatty acid uptake and metabolism in L6 skeletal muscle cells by resistin
    • Palanivel R and Sweeney G (2005) Regulation of fatty acid uptake and metabolism in L6 skeletal muscle cells by resistin. FEBS Lett 579: 5049-5054
    • (2005) FEBS Lett , vol.579 , pp. 5049-5054
    • Palanivel, R.1    Sweeney, G.2
  • 32
    • 18644377203 scopus 로고    scopus 로고
    • Plasma ghrelin and desacyl ghrelin concentrations in renal failure
    • Yoshimoto A et al. (2002) Plasma ghrelin and desacyl ghrelin concentrations in renal failure. J Am Soc Nephrol 13: 2748-2752
    • (2002) J Am Soc Nephrol , vol.13 , pp. 2748-2752
    • Yoshimoto, A.1
  • 33
    • 1042268898 scopus 로고    scopus 로고
    • Associations between plasma ghrelin levels and body composition in end-stage renal disease: A longitudinal study
    • Rodriguez Ayala E et al. (2004) Associations between plasma ghrelin levels and body composition in end-stage renal disease: a longitudinal study. Nephrol Dial Transplant 19: 421-426
    • (2004) Nephrol Dial Transplant , vol.19 , pp. 421-426
    • Rodriguez Ayala, E.1
  • 34
    • 27744582252 scopus 로고    scopus 로고
    • Subcutaneous ghrelin enhances acute food intake in malnourished patients who receive maintenance peritoneal dialysis: A randomized, placebo-controlled trial
    • Wynne K et al. (2005) Subcutaneous ghrelin enhances acute food intake in malnourished patients who receive maintenance peritoneal dialysis: a randomized, placebo-controlled trial. J Am Soc Nephrol 6: 2111-2118
    • (2005) J Am Soc Nephrol , vol.6 , pp. 2111-2118
    • Wynne, K.1
  • 35
    • 20444497662 scopus 로고    scopus 로고
    • Role of leptin and melanocortin signaling in uremia-associated cachexia
    • Cheung W et al. (2005) Role of leptin and melanocortin signaling in uremia-associated cachexia. J Clin Invest 115: 1659-1665
    • (2005) J Clin Invest , vol.115 , pp. 1659-1665
    • Cheung, W.1
  • 36
    • 0037339935 scopus 로고    scopus 로고
    • Hyperleptinemia and reduced TNF-alpha secretion cause resistance of db/db mice to endotoxin
    • Madiehe AM et al. (2003) Hyperleptinemia and reduced TNF-alpha secretion cause resistance of db/db mice to endotoxin. Am J Physiol Regul Integr Comp Physiol 284: R763-R770
    • (2003) Am J Physiol Regul Integr Comp Physiol , vol.284
    • Madiehe, A.M.1
  • 37
    • 0035866377 scopus 로고    scopus 로고
    • Role of central melanocortin system in cachexia
    • Marks DL et al. (2001) Role of central melanocortin system in cachexia. Cancer Res 61: 1432-1438
    • (2001) Cancer Res , vol.61 , pp. 1432-1438
    • Marks, D.L.1
  • 38
    • 0030593939 scopus 로고    scopus 로고
    • Mechanisms of muscle wasting: The role of the ubiquitin-proteasome pathway
    • Mitch WE and Goldberg AL (1996) Mechanisms of muscle wasting: the role of the ubiquitin-proteasome pathway. N Engl J Med 335: 1897-1905
    • (1996) N Engl J Med , vol.335 , pp. 1897-1905
    • Mitch, W.E.1    Goldberg, A.L.2
  • 39
    • 0028212481 scopus 로고
    • Metabolic acidosis stimulates muscle protein degradation by activating the adenosine triphosphate-dependent pathway involving ubiquitin and proteasomes
    • Mitch WE et al. (1994) Metabolic acidosis stimulates muscle protein degradation by activating the adenosine triphosphate-dependent pathway involving ubiquitin and proteasomes. J Clin Invest 93: 2127-2133
    • (1994) J Clin Invest , vol.93 , pp. 2127-2133
    • Mitch, W.E.1
  • 40
    • 0029983847 scopus 로고    scopus 로고
    • Protein degradation and increased mRNAs encoding proteins of the ubiquitin-proteasome proteolytic pathway in BC3H1 myocytes require an interaction between glucocorticoids and acidification
    • Isozaki U et al. (1996) Protein degradation and increased mRNAs encoding proteins of the ubiquitin-proteasome proteolytic pathway in BC3H1 myocytes require an interaction between glucocorticoids and acidification. Proc Natl Acad Sci USA 93: 1967-1971
    • (1996) Proc Natl Acad Sci USA , vol.93 , pp. 1967-1971
    • Isozaki, U.1
  • 41
    • 0029861468 scopus 로고    scopus 로고
    • Muscle wasting in insulinopenic rats results from activation of the ATP-dependent, ubiquitin-proteasome proteolytic pathway by a mechanism including gene transcription
    • Price SR et al. (1996) Muscle wasting in insulinopenic rats results from activation of the ATP-dependent, ubiquitin-proteasome proteolytic pathway by a mechanism including gene transcription. J Clin Invest 98: 1703-1708
    • (1996) J Clin Invest , vol.98 , pp. 1703-1708
    • Price, S.R.1
  • 42
    • 0019581622 scopus 로고
    • Whole-body leucine and lysine metabolism: Response to dietary protein intake in young men
    • Motil KJ et al. (1981) Whole-body leucine and lysine metabolism: response to dietary protein intake in young men. Am J Physiol 240: E712-E721
    • (1981) Am J Physiol , vol.240
    • Motil, K.J.1
  • 43
    • 0028923331 scopus 로고
    • Long-term adaptive responses to dietary protein restriction in chronic renal failure
    • Tom K et al. (1995) Long-term adaptive responses to dietary protein restriction in chronic renal failure. Am J Physiol 268: E668-E677
    • (1995) Am J Physiol , vol.268
    • Tom, K.1
  • 44
    • 0030926828 scopus 로고    scopus 로고
    • Mechanisms permitting nephrotic patients to achieve nitrogen equilibrium with a protein-restricted diet
    • Maroni BJ et al. (1997) Mechanisms permitting nephrotic patients to achieve nitrogen equilibrium with a protein-restricted diet. J Clin Invest 99: 2479-2487
    • (1997) J Clin Invest , vol.99 , pp. 2479-2487
    • Maroni, B.J.1
  • 45
    • 0008469236 scopus 로고    scopus 로고
    • Requirements for protein, calories, and fat in the predialysis patient
    • (Eds Mitch WE and Klahr S) Philadelphia: Lippincott, Williams and Wilkins
    • Mitch WE (2002) Requirements for protein, calories, and fat in the predialysis patient. In Handbook of Nutrition and the Kidney, 144-165 (Eds Mitch WE and Klahr S) Philadelphia: Lippincott, Williams and Wilkins
    • (2002) Handbook of Nutrition and the Kidney , pp. 144-165
    • Mitch, W.E.1
  • 46
    • 0032821775 scopus 로고    scopus 로고
    • Weight loss and low body cell mass in males with lung cancer: Relationship with systemic inflammation, acute-phase response, resting energy expenditure, and catabolic and anabolic hormones
    • Simons JP et al. (1999) Weight loss and low body cell mass in males with lung cancer: relationship with systemic inflammation, acute-phase response, resting energy expenditure, and catabolic and anabolic hormones. Clin Sci 97: 215-223
    • (1999) Clin Sci , vol.97 , pp. 215-223
    • Simons, J.P.1
  • 47
    • 0030954586 scopus 로고    scopus 로고
    • Prevalence of low body mass in rheumatoid arthritis: Associations with the acute phase response
    • Munro R and Capell H (1997) Prevalence of low body mass in rheumatoid arthritis: associations with the acute phase response. Ann Rheum Dis 56: 326-329
    • (1997) Ann Rheum Dis , vol.56 , pp. 326-329
    • Munro, R.1    Capell, H.2
  • 48
    • 0342588054 scopus 로고    scopus 로고
    • Are there two types of malnutrition in chronic renal failure? Evidence for relationships between malnutrition, inflammation and atherosclerosis (MIA syndrome)
    • Stenvinkel P et al. (2000) Are there two types of malnutrition in chronic renal failure? Evidence for relationships between malnutrition, inflammation and atherosclerosis (MIA syndrome). Nephrol Dial Transplant 15: 953-960
    • (2000) Nephrol Dial Transplant , vol.15 , pp. 953-960
    • Stenvinkel, P.1
  • 49
    • 0036677423 scopus 로고    scopus 로고
    • Intradialytic parenteral nutrition improves protein and energy homeostasis in chronic hemodialysis patients
    • Pupim LB et al. (2002) Intradialytic parenteral nutrition improves protein and energy homeostasis in chronic hemodialysis patients. J Clin Invest 110: 483-492
    • (2002) J Clin Invest , vol.110 , pp. 483-492
    • Pupim, L.B.1
  • 50
    • 0016378631 scopus 로고
    • Growth patterns and dietary intake of children with chronic renal insufficiency
    • Betts PR and McGrath G (1974) Growth patterns and dietary intake of children with chronic renal insufficiency. Br Med J 2: 189-193
    • (1974) Br Med J , vol.2 , pp. 189-193
    • Betts, P.R.1    McGrath, G.2
  • 51
    • 0015229402 scopus 로고
    • Relation of calorie deficiency to growth failure in children on hemodialysis and the growth response to calorie supplementation
    • Simmons JM et al. (1971) Relation of calorie deficiency to growth failure in children on hemodialysis and the growth response to calorie supplementation. N Engl J Med 285: 653-656
    • (1971) N Engl J Med , vol.285 , pp. 653-656
    • Simmons, J.M.1
  • 52
    • 0020613855 scopus 로고
    • Effect of calorie supplementation on growth in children with uremia
    • Arnold WC et al. (1983) Effect of calorie supplementation on growth in children with uremia. Kidney Int 24: 205-209
    • (1983) Kidney Int , vol.24 , pp. 205-209
    • Arnold, W.C.1
  • 53
    • 0346270557 scopus 로고    scopus 로고
    • Catch-up growth with normal parathyroid hormone levels in chronic renal failure
    • Walker S et al. (2003) Catch-up growth with normal parathyroid hormone levels in chronic renal failure. Pediatr Nephrol 18: 1236-1241
    • (2003) Pediatr Nephrol , vol.18 , pp. 1236-1241
    • Walker, S.1
  • 54
    • 0019959831 scopus 로고
    • The effects of chronic renal failure in infancy on growth, nutritional status and body compositioin
    • Jones RW et al. (1982) The effects of chronic renal failure in infancy on growth, nutritional status and body compositioin. Pediatr Res 16: 784-791
    • (1982) Pediatr Res , vol.16 , pp. 784-791
    • Jones, R.W.1
  • 55
    • 18844432794 scopus 로고    scopus 로고
    • The regulation of feeding and metabolic rate and the prevention of murine cancer cachexia with a small-molecule melanocortin-4 receptor antagonist
    • Markison S et al. (2005) The regulation of feeding and metabolic rate and the prevention of murine cancer cachexia with a small-molecule melanocortin-4 receptor antagonist. Endocrinology 146: 2766-2773
    • (2005) Endocrinology , vol.146 , pp. 2766-2773
    • Markison, S.1
  • 56
    • 17844391500 scopus 로고    scopus 로고
    • The hardship of obesity: A soft-wired hypothalamus
    • Horvath TL (2005) The hardship of obesity: a soft-wired hypothalamus. Nature Neurosci 8: 561-565
    • (2005) Nature Neurosci , vol.8 , pp. 561-565
    • Horvath, T.L.1
  • 57
    • 17844401704 scopus 로고    scopus 로고
    • Anatomy and regulation of the central melanocortin system
    • Cone RD (2005) Anatomy and regulation of the central melanocortin system. Nature Neurosci 8: 571-578
    • (2005) Nature Neurosci , vol.8 , pp. 571-578
    • Cone, R.D.1


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