Abstract
Zinc toxicity has been linked to cellular glutathione: A decrease in glutathione is followed by an increase in zinc-mediated toxicity. The question arises whether an increase in glutathione synthesis might decrease zinc-mediated cytotoxicity. We incubated five cell lines (hepatoma and lung-derived) with zinc chloride and 2 mmol/l N-acetyl-l-cysteine (NAC) to support glutathione synthesis. In all but one hepatic cell line, the glutathione content was increased by NAC as compared to the d-enantiomere NADC, whereas NADC did not increase GSH content as compared to not treated controls. In both alveolar epithelial cell lines, an increase in zinc tolerance was observed due to NAC as compared to NADC. In native fibroblast-like and the hepatoma cell lines, no changes in zinc tolerance were found due to NAC. In the fibroblast-like cells, zinc tolerance was increased due to NAC only after cellular glutathione had been previously decreased (by lowered cysteine concentrations in the medium). Enhancing glutathione synthesis can antagonize zinc-mediated toxicity in the alveolar epithelial cell lines, whereas some other characteristics than glutathione synthesis might be more important in other cell types. Furthermore, NAC acted as a GSH precursor only at cysteine medium concentrations of 10 µmol/l or below and therefore might be described as a poor cysteine repletor for glutathione synthesis.
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Abbreviations
- ARDS:
-
acute respiratory distress syndrome
- Cys:
-
L-cysteine
- DMEMmF12:
-
Dulbecco’s modified Eagle medium/Ham’s F12 nutrient mix (1:1)
- DTNB:
-
5,5′-dithio-bis(2-nitrobenzoic acid)
- EC50 :
-
concentration for 50% effectivity
- EDTA:
-
N,N,N′,N′-ethylendiaminetetraacetate
- Fcs:
-
fetal calf serum
- GC:
-
glucocorticoid(s)
- GR:
-
glutathione reductase, GSSG reductase
- GSH:
-
glutathione, reduced form
- GSSG:
-
glutathione, oxidized form
- HC:
-
hydrocortisone
- MEM:
-
minimum essential medium
- Met:
-
l-methionine
- NAC:
-
N-acetyl-l-cysteine
- NADC:
-
N-acetyl-d-cysteine
- NADPH:
-
nicotinamide-adenine dinucleotide phosphate, reduced
- oxo-Th:
-
oxo-thiazolidinedione
- PBS:
-
phosphate-buffered saline
- SD:
-
standard deviation
- SDS:
-
sodium laurylsulfate
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This work is dedicated to Peter Eyer on the occasion of his 65th birthday.
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Walther, U.I., Walther, S.C., Mückter, H. et al. Enhancing Glutathione Synthesis can Decrease Zinc-Mediated Toxicity. Biol Trace Elem Res 122, 216–228 (2008). https://doi.org/10.1007/s12011-007-8072-9
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DOI: https://doi.org/10.1007/s12011-007-8072-9