Abstract
In the present study, the toxicity of yperite, SM, and its structural analogue mechlorethamine, HN2, was investigated in a human bronchial epithelial cell line 16HBE. Cell detachment was initiated by caspase-2 activation, down-regulation of Bcl-2 and loss of mitochondrial membrane potential. Only in detached cells, mustards induced apoptosis associated with increase in p53 expression, Bax activation, decrease in Bcl-2 expression, opening of the mitochondrial permeability transition pore, release of cytochrome c, caspase-2, -3, -8, -9 and -13 activation and DNA fragmentation. Apoptosis, occurring only in detached cells, could be recognized as anoikis and the mitochondrion, involved both in cell detachment and subsequent cell death, appears to be a crucial checkpoint. Based on our understanding of the apoptotic pathway triggered by mustards, we demonstrated that inhibition of the mitochondrial pathway by ebselen, melatonin and cyclosporine A markedly prevented mustard-induced anoikis, pointing to these drugs as interesting candidates for the treatment of mustard-induced airway epithelial lesions.
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This work was support by the Délégation Générale pour l’Armement (D.G.A./D.S.P. No. 95-151). A. Deniaud received a fellowship from Ligue contre le Cancer. C. Brenner is supported by the Association pour la Recherche sur le Cancer (ARC). The authors are grateful to D.C. Gruenert for providing us with the human bronchial epithelial cell line.
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Sourdeval, M., Lemaire, C., Deniaud, A. et al. Inhibition of caspase-dependent mitochondrial permeability transition protects airway epithelial cells against mustard-induced apoptosis. Apoptosis 11, 1545–1559 (2006). https://doi.org/10.1007/s10495-006-8764-1
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DOI: https://doi.org/10.1007/s10495-006-8764-1