Abstract
Inhibitor of apoptosis proteins (IAPs) regulate the activity of caspases in apoptosis. The human X chromosome-encoded IAP (XIAP) is one of the more potent members of the IAP family and it has been described as a central regulator of apoptosis. Thus, molecules that inhibit XIAP could offer therapeutic opportunities to treat unwanted apoptosis inhibition. In the present study we have applied the selective optimization of side activities (SOSA) approach to the discovery of XIAP inhibitors. In this sense, we have identified dequalinium hydrochloride (Dq) as an inhibitor of the XIAP/caspase-3 interaction both in vitro and in cellular assays.
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Abbreviations
- BIRs:
-
Baculovirus inhibitor of apoptosis proteins repeats
- Bz:
-
Benzethonium chloride
- cIAP:
-
Cellular inhibitor of apoptosis proteins 1
- Dq:
-
Dequalinium hydrochloride
- Gfa:
-
Glafenine hydrochloride
- HeLa:
-
Human epithelial carcinoma cell line
- IAP:
-
Inhibitor of apoptosis proteins
- MBz:
-
Methyl benzethonium
- MTT:
-
(3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide)
- NMR:
-
Nuclear magnetic resonance spectroscopy
- Smac/DIABLO protein:
-
Second mitochondria-derived activator of caspases/direct IAP-binding protein with low PI
- SOSA:
-
Selective optimization of side activities
- STD:
-
Saturation transfer difference
- water-LOGSY:
-
Water-ligand observed by gradient spectroscopy
- TNF:
-
Tumor necrosis factor alpha
- XIAP:
-
X chromosome-encoded IAP
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Acknowledgments
This work was supported by grants from the Spanish Ministry of Science and Innovation (MICINN-BIO2007-60066), Generalitat Valenciana Prometeo 2010/005 (partially funded with ERDF) and Consolider-Ingenio 2010 (MICINN-CSD2008-00005C) to E.P.-P. We thank Susana Rubio and Alicia García-Jareño for technical assistance. Y.P.-R. was supported by a postdoctoral fellowship from National Autonomous University of Mexico and Consejo Superior de Investigaciones Científicas of Spain (UNAM-CSIC).
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Orzáez, M., Gortat, A., Sancho, M. et al. Characterization of dequalinium as a XIAP antagonist that targets the BIR2 domain. Apoptosis 16, 460–467 (2011). https://doi.org/10.1007/s10495-011-0582-4
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DOI: https://doi.org/10.1007/s10495-011-0582-4