Placental ceruloplasmin homolog is regulated by iron and copper and is implicated in iron metabolism

R. Danzeisen, C. Fosset, Z. Chariana, K. R. Page, S. Davis, H. J. McArdle

Research output: Contribution to journalArticle

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Abstract

We previously reported an endogenous, membrane-bound Cu oxidase with homology to ceruloplasmin in BeWo cells, a placental choriocarcinoma cell line. In this previous study, ceruloplasmin immunoreactivity was localized to the perinuclear region and non-brush-border membranes. Here, we show that azide-sensitive oxidase activity is enriched in the same fractions, correlating subcellular localization of enzyme activity with ceruloplasmin immunoreactivity. Expression of the placental Cu oxidase is inversely proportional to Fe status and directly proportional to Cu status at enzyme and protein levels. To identify a role for the Cu oxidase, cells were exposed to Fe-59-transferrin for 18 h in an environment of 20% O-2 or 5% O-2. At 5% O-2, Cu-deficient cells retain significantly more Fe-59 than control cells. This excess in Fe-59 accumulation is caused by a significant decrease in Fe-59 release. These results indicate that downregulation of the placental Cu oxidase in BeWo cells impairs Fe release. This effect is only apparent in an environment of limited O-2.

Original languageEnglish
Pages (from-to)C472-C478
Number of pages7
JournalAmerican Journal of Physiology: Cell Physiology
Volume282
Issue number3
DOIs
Publication statusPublished - 1 Mar 2002

Fingerprint

Ceruloplasmin
Copper
Oxidoreductases
Iron
Choriocarcinoma
Subcellular Fractions
Membranes
Azides
Enzymes
Transferrin
Down-Regulation
Cell Line
Proteins

Keywords

  • BeWo
  • hephaestin
  • hypoxia
  • placenta
  • human
  • ferroxidase
  • transferrin-mediated uptake
  • bewo choriocarcinoma cells
  • messenger-RNA
  • transport
  • receptor
  • release
  • rat
  • aceruloplasminemia
  • metallothionein
  • localization

Cite this

Placental ceruloplasmin homolog is regulated by iron and copper and is implicated in iron metabolism. / Danzeisen, R.; Fosset, C.; Chariana, Z.; Page, K. R.; Davis, S.; McArdle, H. J.

In: American Journal of Physiology: Cell Physiology, Vol. 282, No. 3, 01.03.2002, p. C472-C478.

Research output: Contribution to journalArticle

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AU - Fosset, C.

AU - Chariana, Z.

AU - Page, K. R.

AU - Davis, S.

AU - McArdle, H. J.

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N2 - We previously reported an endogenous, membrane-bound Cu oxidase with homology to ceruloplasmin in BeWo cells, a placental choriocarcinoma cell line. In this previous study, ceruloplasmin immunoreactivity was localized to the perinuclear region and non-brush-border membranes. Here, we show that azide-sensitive oxidase activity is enriched in the same fractions, correlating subcellular localization of enzyme activity with ceruloplasmin immunoreactivity. Expression of the placental Cu oxidase is inversely proportional to Fe status and directly proportional to Cu status at enzyme and protein levels. To identify a role for the Cu oxidase, cells were exposed to Fe-59-transferrin for 18 h in an environment of 20% O-2 or 5% O-2. At 5% O-2, Cu-deficient cells retain significantly more Fe-59 than control cells. This excess in Fe-59 accumulation is caused by a significant decrease in Fe-59 release. These results indicate that downregulation of the placental Cu oxidase in BeWo cells impairs Fe release. This effect is only apparent in an environment of limited O-2.

AB - We previously reported an endogenous, membrane-bound Cu oxidase with homology to ceruloplasmin in BeWo cells, a placental choriocarcinoma cell line. In this previous study, ceruloplasmin immunoreactivity was localized to the perinuclear region and non-brush-border membranes. Here, we show that azide-sensitive oxidase activity is enriched in the same fractions, correlating subcellular localization of enzyme activity with ceruloplasmin immunoreactivity. Expression of the placental Cu oxidase is inversely proportional to Fe status and directly proportional to Cu status at enzyme and protein levels. To identify a role for the Cu oxidase, cells were exposed to Fe-59-transferrin for 18 h in an environment of 20% O-2 or 5% O-2. At 5% O-2, Cu-deficient cells retain significantly more Fe-59 than control cells. This excess in Fe-59 accumulation is caused by a significant decrease in Fe-59 release. These results indicate that downregulation of the placental Cu oxidase in BeWo cells impairs Fe release. This effect is only apparent in an environment of limited O-2.

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