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Mol Cancer Ther. 2017 Sep;16(9):1779-1790. doi: 10.1158/1535-7163.MCT-16-0848. Epub 2017 Jun 15.

Inhibition of Hsp90 Suppresses PI3K/AKT/mTOR Signaling and Has Antitumor Activity in Burkitt Lymphoma.

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Department of Pediatrics, Weill Cornell Medical College, New York, New York.
Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, New York.
Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, New York, New York.
Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York.
Department of Pediatrics, Roswell Park Cancer Institute, Buffalo, New York.
Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, New York.


Hsp90 is a molecular chaperone that protects proteins, including oncogenic signaling complexes, from proteolytic degradation. PU-H71 is a next-generation Hsp90 inhibitor that preferentially targets the functionally distinct pool of Hsp90 present in tumor cells. Tumors that are driven by the MYC oncoprotein may be particularly sensitive to PU-H71 due to the essential role of Hsp90 in the epichaperome, which maintains the malignant phenotype in the setting of MYC. Burkitt lymphoma (BL) is an aggressive B-cell lymphoma characterized by MYC dysregulation. In this study, we evaluated Hsp90 as a potential therapeutic target in BL. We found that primary BL tumors overexpress Hsp90 and that Hsp90 inhibition has antitumor activity in vitro and in vivo, including potent activity in a patient-derived xenograft model of BL. To evaluate the targets of PU-H71 in BL, we performed high-affinity capture followed by proteomic analysis using mass spectrometry. We found that Hsp90 inhibition targets multiple components of PI3K/AKT/mTOR signaling, highlighting the importance of this pathway in BL. Finally, we found that the anti-lymphoma activity of PU-H71 is synergistic with dual PI3K/mTOR inhibition in vitro and in vivo Overall, this work provides support for Hsp90 as a therapeutic target in BL and suggests the potential for combination therapy with PU-H71 and inhibitors of PI3K/mTOR. Mol Cancer Ther; 16(9); 1779-90. ©2017 AACR.

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