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      Molecular analysis of iron overload in beta2-microglobulin-deficient mice.

      Blood Cells, Molecules & Diseases

      Animals, Biological Transport, Blotting, Northern, Duodenum, metabolism, Hemochromatosis, Iron, Iron Overload, genetics, Liver, Mice, Mice, Knockout, RNA, Messenger, beta 2-Microglobulin, deficiency

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          Abstract

          Beta2-microglobulin knockout (beta2m-/-) mice represent an instructive model of spontaneous iron overload resembling genetic hemochromatosis. The mechanism of iron accumulation in this mouse model may be more complex than involving the MHC class I-like protein HFE. We report that beta2m-deficient mice, like Hfe-/- mice, lack the adaptive hepatic hepcidin mRNA increase to iron overload. The inverse correlation of hepatic iron levels and hepcidin mRNA expression in six beta2m-/- mice underlines the importance of hepcidin in regulating body iron stores. In contrast to Hfe-/- mice, beta2m-deficient mice display increased expression of the duodenal iron transporters DMT1 and ferroportin 1. This result implicates a broader role of beta2m in mammalian iron metabolism, suggesting that (an) additional beta2m-interacting protein(s) could be involved in controlling iron homeostasis, and highlighting the emerging connection of iron metabolism with the immune system.

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          Journal
          15315790
          10.1016/j.bcmd.2004.05.003

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