Abstract
Human heat shock protein 27 (Hsp27, HspB1) is an anti-apoptotic protein characterized for its tumorigenic and metastatic properties, and now referenced as a major therapeutic target in many types of cancer. Hsp27 biochemical properties rely on a structural oligomeric and dynamic organization. Downregulation by small interfering RNA or inhibition with dominant-negative mutant have proven their efficiency to counteract the anti-apoptotic and protective properties of Hsp27. In this study, we report the isolation and characterization of Hsp27-targeted molecules interfering with its structural organization. Using the peptide aptamer (PA) strategy, we isolated PAs that specifically interact with Hsp27 and not with the other members of the small heat shock protein family. In mammalian cell cultures, PAs expression perturbed the dimerization and oligomerization of Hsp27, and acted as negative regulators of the anti-apoptotic and cytoprotective activities of this protein. Further studies analyzing SQ20B cell xenografts in immunocompromised mice showed that PAs strongly reduced tumor development through cell cycle arrest. Our data suggest that PAs could provide a potential tool to develop strategies for the discovery of Hsp27 chemical inhibitors.
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Acknowledgements
We wish to thank D Guillet for excellent technical assistance and Marc Bickle for helpful discussions. This work was supported by a research grant from the Comité du Rhône of la Ligue Contre le Cancer and the Région Rhône-Alpes and Retina France for APA. GB was supported by a PhD training grant from the La Région Rhône-Alpes.
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Gibert, B., Hadchity, E., Czekalla, A. et al. Inhibition of heat shock protein 27 (HspB1) tumorigenic functions by peptide aptamers. Oncogene 30, 3672–3681 (2011). https://doi.org/10.1038/onc.2011.73
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DOI: https://doi.org/10.1038/onc.2011.73
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