Understanding the mechanisms that control stress-induced apoptosis is critical to explain how tumours respond to treatment, as cancer cells frequently escape drug toxicity by regulating stress response through heat shock protein (HSP) expression. The overexpression of Hsp72, in particular, results in increased incidence of cell transformation, and correlates with poor prognosis in a wide range of cancers. We have shown that Hsp72 assists folding of oncogenic NPM–ALK kinase in anaplastic large-cell lymphomas (ALCLs), but its role in the maintenance of the malignant phenotype remains uncertain. Therefore, we assessed Hsp72 expression in ALCLs, investigating more in detail the mechanisms that regulate its status and activity. We found that Hsp72 is unique among the HSPs involved in tumourigenesis to be overexpressed in ALK+ tumours and cell lines and to be induced by stress. Different from other HSPs, Hsp72 prevents cell injury, Bax activation and death by apoptosis in ALK+ cells, acting both upstream and downstream of mitochondria. Conversely, Hsp72 is underexpressed in ALK− ALCL cells, and it is unable to protect cells from apoptosis under stress. Moreover, when Hsp72 expression is reduced following NPM–ALK inhibition, lymphoma cells undergo apoptosis, demonstrating the importance of Hsp72 in regulating ALCL stress response and drug sensitivity.
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We thank Dr G Franceschetto for the statistical analysis; A Cabrelle (Venetian Institute of Molecular Medicine, Padova, Italy) for performing FACS analysis; and E Tosato and A Molin for their technical expertise and support. This work was supported by Fondazione Città della Speranza and MIUR (Ministero Istruzione Università e Ricerca).
The authors declare no conflict of interest.
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Bonvini, P., Zorzi, E., Mussolin, L. et al. Consequences of heat shock protein 72 (Hsp72) expression and activity on stress-induced apoptosis in CD30+ NPM–ALK+ anaplastic large-cell lymphomas. Leukemia 26, 1375–1382 (2012). https://doi.org/10.1038/leu.2011.367
- anaplastic large-cell lymphoma
- heat shock proteins