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Cell Biology and Toxicology

, Volume 21, Issue 3–4, pp 163–179 | Cite as

Multiple effects of mercury on cell volume regulation, plasma membrane permeability, and thiol content in the human intestinal cell line Caco-2

  • I. Aduayom
  • F. Denizeau
  • C. Jumarie
Article

Abstract

In a previous study, we characterized Cd–Hg interactions for uptake in human intestinal Caco-2 cells. We pursued our investigations on metal uptake from metal mixtures, focusing on the effects of Hg on cellular homeostasis. A 4-fold higher equilibrium accumulation value of 0.3 μmol/L 203Hg was measured in the presence of 100 μmol/L unlabeled Hg in the serum-free exposure medium without modification in the initial uptake rate. This phenomenon was eliminated at 4C. Mercury induced an increase in tritiated water and [3H]mannitol uptakes for exposure times greater than 20 min. Incubations for 20 min and 30 min with 100 μmol/L Hg and 2 mmol/L N-ethylmaleimide (NEM) resulted in a 34% and 50% reductions in cellular thiol staining, respectively, with additive effects. Lactate dehydrogenase leakage and live/dead assays confirmed the maintenance of cell membrane integrity in Hg- or NEM-treated cells. We conclude that Hg may alter membrane permeability and increase cell volume without any loss in cell viability. This phenomenon is sensitive to temperature and could involve Hg interaction with membrane thiols, possibly related to solute transport. During metal uptake from metal mixtures, Hg may thus promote the uptake of other toxic metals by increasing cell volume and consequently cell capacity.

Keywords

mercury cadmium cell volume membrane permeability thiols intestinal Caco-2 cells 

Abbreviation

DG

2-deoxy[3H]glucose

DMEM

Dulbecco's Modified Eagle Minimal Essential Medium

DTNB

5,5′-dithiobis(2-nitrobenzoic acid)

DTT

dithiothreitol

FBS

fetal bovine serum

GSH

glutathione (reduced)

LDH

lactate dehydrogenase

NADH+

nicotinamide–adenine dinucleotide (reduced)

NEM

N-ethylmaleimide

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Département de ChimieUniversité du Québec à MontréalMontrealCanada
  2. 2.Département des Sciences BiologiquesUniversité du Québec à MontréalMontrealCanada
  3. 3.Département des Sciences BiologiquesUniversité du Québec à MontréalMontréalCanada

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