Copper uptake and intracellular distribution in the human intestinal Caco-2 cell line

Simonetta Ferruzza, Yula Sambuy, Maria Rosa Ciriolo, Angelo De Martino, Paolo Santaroni, Giuseppe Rotilio, Maria Laura Scarino

Research output: Contribution to journalArticlepeer-review

Abstract

The apical uptake of 64CuCl2 was investigated in human differentiated intestinal Caco-2 cells grown on permeable supports. At pH 6.0 in the apical compartment, the uptake of copper was linear over the first 6 min and between 10 and 80 μM CuCl2 exhibited non-saturable transport kinetics. In addition, copper uptake was energy-independent, affected by the valency state of copper, preferring Cu(II) over Cu(I), and not influenced by high (10 mM) extracellular calcium. The intracellular distribution of copper was investigated by FPLC at different times of uptake ('pulse') and of 'chase'. Intracellular copper initially bound predominantly to low molecular weight components (i.e., glutathione), and subsequently shifted to higher molecular weight components such as metallothionein and Cu,Zn superoxide dismutase.

Original languageEnglish
Pages (from-to)179-185
Number of pages7
JournalBioMetals
Volume13
Issue number2
DOIs
Publication statusPublished - 2000

Keywords

  • Cu
  • GSH
  • Heavy metals
  • Metallothionein
  • Passive uptake

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)

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