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Histone deacetylase inhibitors interrupt HSP90•RASGRP1 and HSP90•CRAF interactions to upregulate BIM and circumvent drug resistance in lymphoma cells.

Abstract：

:Histone deacetylase (HDAC) inhibitors, which are approved for the treatment of cutaneous T-cell lymphoma and multiple myeloma, are undergoing evaluation in other lymphoid neoplasms. How they kill susceptible cells is incompletely understood. Here, we show that trichostatin A, romidepsin and panobinostat induce apoptosis across a panel of malignant B cell lines, including lines that are intrinsically resistant to bortezomib, etoposide, cytarabine and BH3 mimetics. Further analysis traces the pro-apoptotic effects of HDAC inhibitors to increased acetylation of the chaperone heat shock protein 90 (HSP90), causing release and degradation of the HSP90 client proteins RASGRP1 and CRAF, which in turn leads to downregulation of mitogen-activated protein kinase pathway signaling and upregulation of the pro-apoptotic BCL2 family member BIM in vitro and in vivo. Importantly, these pro-apoptotic effects are mimicked by RASGRP1 small interfering RNA (siRNA) or HSP90 inhibition and reversed by overexpression of constitutively active MEK1 or siRNA-mediated downregulation of BIM. Collectively, these observations not only identify a new HSP90 client protein, RASGRP1, but also delineate a complete signaling pathway from HSP90 acetylation through RASGRP1 and CRAF degradation to BIM upregulation that contributes to selective cytotoxicity of HDAC inhibitors in lymphoid malignancies.

journal_name

Leukemia

journal_title

Leukemia

authors

Ding H,Peterson KL,Correia C,Koh B,Schneider PA,Nowakowski GS,Kaufmann SH

doi

10.1038/leu.2016.357

subject

Has Abstract

pub_date

2017-07-01 00:00:00

pages

1593-1602

issue

7

eissn

0887-6924

issn

1476-5551

pii

leu2016357

journal_volume

31

pub_type

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