Copper-induced ferroportin-1 expression in J774 macrophages is associated with iron efflux

Jayong Chung, David J. Haile, Marianne Wessling-Resnick

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51 Scopus citations


Copper is known to play a role in iron recycling from macrophages. To examine whether cellular copper status affects expression of the iron exporter ferroportin-1 (FPN1), J774 macrophage cells were exposed to 10-100 μM CuSO4 for up to 20 h. Copper treatment significantly increased FPN1 mRNA in a dose- and time-dependent manner. After 20 h, 100 μM CuSO 4 up-regulated FPN1 transcript levels ≈13-fold compared to untreated controls. Induction was detected 8 h after copper treatment was initiated and markedly increased thereafter. A corresponding increase in FPN1 protein levels was observed upon copper treatment. Induction of J774 cell FPN1 expression by copper was also associated with a dose-dependent increase in 59Fe release after erythrophagocytosis of labeled red blood cells. Thus, a previously uncharacterized role for copper in the regulation of macrophage iron recycling is suggested by the induction of FPN1 gene expression and iron efflux by this metal.

Original languageEnglish (US)
Pages (from-to)2700-2705
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number9
StatePublished - Mar 2 2004

ASJC Scopus subject areas

  • General


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