Abstract:
:In addition to occasional autoimmune hemolytic anemia, unexplained iron-deficiency anemia has been reported in childhood Castleman disease (CD). The recent discovery of hepcidin has regenerated the research on iron metabolism. This hormone is a key regulator of iron homeostasis, mainly by inhibiting intestinal iron absorption. Liver expression of hepcidin increases in response to interleukin 6 (IL-6). With chronic overproduction of IL-6 as a hallmark, CD could be an interesting human model for studying the contribution of the IL-6/hepcidin pathway in the pathogenesis of anemia of chronic disease. We report here the case of a 16-year-old boy with chronic iron-deficiency anemia (plasma ferritin: 19 μg/L; plasma iron: 2.2 μmol/L; negative bone marrow Perls' Prussian blue stain), inflammatory syndrome (C-reactive protein: 108 mg/L), and growth retardation for the previous 2 years. Diagnostic workup revealed a large mesenteric mass corresponding to localized CD of mixed histologic type. Resection of the tumor resulted in complete resolution of iron-deficiency anemia and inflammatory syndrome. Parallel variations of plasma IL-6, C-reactive protein, and hepcidin concentrations, together with tumor immunohistochemistry, strongly suggested that IL-6 synthesized by the tumor caused both the inflammation and iron deficiency through enhancement of hepcidin production by the liver. The results of this unique case study (1) explain the mechanism of iron deficiency observed in some children with CD, (2) confirm in vivo the regulatory effect of IL-6 in human hepcidin production, and (3) suggest that iron deficiency is a causal link between IL-6 and anemia of chronic disease.
journal_name
Pediatricsjournal_title
Pediatricsauthors
Arlet JB,Hermine O,Darnige L,Ostland V,Westerman M,Badoual C,Pouchot J,Capron Ldoi
10.1542/peds.2010-1123subject
Has Abstractpub_date
2010-12-01 00:00:00pages
e1608-12issue
6eissn
0031-4005issn
1098-4275pii
peds.2010-1123journal_volume
126pub_type
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