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Adipocyte Hypoxia Increases Hepatocyte Hepcidin Expression

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Abstract

Hepcidin plays a key role in regulating iron metabolism by blocking iron efflux from macrophages and enterocytes. Hepcidin is synthesized primarily in the liver, and its expression is increased by iron overload and inflammation. Obesity is associated with chronic inflammation as well as poor iron status. Central obesity causes adipocyte hypoxia resulting in chronic inflammation. Therefore, the objective of the present study was to determine if adipocyte hypoxia and associated inflammation signal hepatocyte hepcidin expression. The effect of adipocyte hypoxia on hepcidin expression was modeled using a 3T3-L1 adipocyte/Huh7 hepatocyte co-culture model. Adipocytes were cultured at either standard conditions (19% O2) or hypoxic conditions (1% O2). Compared to standard conditions, hypoxic 3T3-L1 cells had significantly higher IL-6 and leptin expression. Treatment of Huh7 cells with media from hypoxic or LPS-treated 3T3-L1 adipocytes significantly increased hepcidin promoter activity and mRNA compared to cells treated with normoxic 3T3-L1 media or control media. When the hepcidin STAT3 binding site was mutated, promoter activation by hypoxic media was abrogated. These data suggest that adipocyte hypoxia (a feature of central obesity) may increase hepcidin expression and plays a role in the association between obesity and poor iron status.

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Authors and Affiliations

  1. Department of Nutrition, Dietetics, & Food Sciences, Utah State University, 8700 Old Main Hill, 750 North 1200 East, Logan, UT, 89322-8700, USA

    Korry Joseph Hintze, Dallin Snow, Darren Nabor & Hunter Timbimboo

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  1. Korry Joseph Hintze
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  2. Dallin Snow
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  3. Darren Nabor
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  4. Hunter Timbimboo
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Correspondence to Korry Joseph Hintze.

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Hintze, K.J., Snow, D., Nabor, D. et al. Adipocyte Hypoxia Increases Hepatocyte Hepcidin Expression. Biol Trace Elem Res 143, 764–771 (2011). https://doi.org/10.1007/s12011-010-8932-6

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  • DOI: https://doi.org/10.1007/s12011-010-8932-6

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