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Toxicological Sciences 54, 212-221 (2000)
Copyright © 2000 by the Society of Toxicology

Protection from Cytotoxic Effects Induced by the Nitrogen Mustard Mechlorethamine on Human Bronchial Epithelial Cells in Vitro

Stéphane Rappeneau1, Armelle Baeza-Squiban, Claudette Jeulin and Francelyne Marano

Laboratoire de Cytophysiologie et Toxicologie Cellulaire, Université Paris VII-Denis Diderot, Tour 53/54 E3, case 70–73, 2 place Jussieu, 75251 Paris Cedex 05, France

The present study was undertaken to find potent molecules against the toxicity of nitrogen mustard mechlorethamine (HN2) on respiratory epithelial cells, using a human bronchial epithelial cell line (16HBE14o-) as an in vitro model. The compounds examined included inhibitors of poly(ADP-ribose) polymerase (PARP), sulfhydryl-group donors as nucleophiles, and iron chelators and inhibitors of lipid peroxidation as antioxidants. Their effectiveness was determined upon observance of metabolic dysfunction induced by HN2 following a 4-h exposure, using (3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) reduction and ATP-level assays as indicators. Moreover, the fluorescent probe, monobromobimane (mBBr), and 2',7'-dichlorofluorescin-diacetate (H2DCF-DA) were used to assess intracellular sulfhydryl and peroxide level modifications by flow cytometry, respectively, following a 3-h exposure. At last, cell death was assessed by flow cytometry using the propidium iodide (PI)-dye-exclusion assay following 24-h exposure. PARP inhibitors (niacinamide, 3-aminobenzamide, 6(5H)-phenanthridinone), and two sulfhydryl-group donors (N-acetylcysteine, WR-1065) were found to be effective in preventing HN2-induced metabolic dysfunction when added in immediate or delayed treatment with HN2. Only N-acetylcysteine, however, was found to prevent cell death induced by HN2, though it must be present at the time of the HN2 challenge. Flow cytometric measurements of intracellular sulfhydryl levels strongly suggested that N-acetylcysteine and WR-1065 are preventive in alkylation of cellular compounds, mainly by direct extracellular interaction with HN2. PARP inhibitors prevent secondary deleterious effects induced by HN2, considering metabolism dysfunction as the endpoint. Elsewhere, the oxidative stress appears to be a side effect in HN2 toxicity only upon considering the inefficiency of several antioxidants.

Key Words: mechlorethamine; protection; respiratory epithelium; interaction; PARP; oxidative stress.


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S. Rappeneau, A. Baeza-Squiban, F. Marano, and J.-H. Calvet
Efficient Protection of Human Bronchial Epithelial Cells against Sulfur and Nitrogen Mustard Cytotoxicity Using Drug Combinations
Toxicol. Sci., November 1, 2000; 58(1): 153 - 160.
[Abstract] [Full Text] [PDF]


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