Broad-Spectrum HDAC Inhibitors Promote Autophagy through FOXO Transcription Factors in Neuroblastoma

Depending on context and tumor stage, deregulation of autophagy can either suppress tumorigenesis or promote chemoresistance and tumor survival. Histone deacetylases (HDACs) can modulate autophagy; however, the exact mechanisms are not fully understood. Here, we analyze the effects of the broad-spec...

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Published in:Cells (Basel, Switzerland) Switzerland), 2021-04, Vol.10 (5), p.1001
Main Authors: Körholz, Katharina, Ridinger, Johannes, Krunic, Damir, Najafi, Sara, Gerloff, Xenia F, Frese, Karen, Meder, Benjamin, Peterziel, Heike, Vega-Rubin-de-Celis, Silvia, Witt, Olaf, Oehme, Ina
Format: Article
Language:English
Subjects:
Apoptosis
Autophagy
Cancer therapies
Cell culture
Cell cycle
Cell death
Chemoresistance
Chloroquine
Forkhead protein
FOXO1
FOXO1 protein
FOXO3 protein
FOXO3a
Gene expression
Gene regulation
Histone deacetylase
Histones
Homeostasis
Kinases
macroautophagy
Microorganisms
Neuroblastoma
Neuroblastoma cells
Nuclear transport
panobinostat
Phagocytosis
Phosphorylation
Proteins
Transcription factors
Tumorigenesis
Tumors
vorinostat
Xenografts
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Summary:Depending on context and tumor stage, deregulation of autophagy can either suppress tumorigenesis or promote chemoresistance and tumor survival. Histone deacetylases (HDACs) can modulate autophagy; however, the exact mechanisms are not fully understood. Here, we analyze the effects of the broad-spectrum HDAC inhibitors (HDACi) panobinostat and vorinostat on the transcriptional regulation of autophagy with respect to autophagy transcription factor activity (Transcription factor EB-TFEB, forkhead boxO-FOXO) and autophagic flux in neuroblastoma cells. In combination with the late-stage autophagic flux inhibitor bafilomycin A1, HDACis increase the number of autophagic vesicles, indicating an increase in autophagic flux. Both HDACi induce nuclear translocation of the transcription factors FOXO1 and FOXO3a, but not TFEB and promote the expression of pro-autophagic FOXO1/3a target genes. Moreover, FOXO1/3a knockdown experiments impaired HDACi treatment mediated expression of autophagy related genes. Combination of panobinostat with the lysosomal inhibitor chloroquine, which blocks autophagic flux, enhances neuroblastoma cell death in culture and hampers tumor growth in vivo in a neuroblastoma zebrafish xenograft model. In conclusion, our results indicate that pan-HDACi treatment induces autophagy in neuroblastoma at a transcriptional level. Combining HDACis with autophagy modulating drugs suppresses tumor growth of high-risk neuroblastoma cells. These experimental data provide novel insights for optimization of treatment strategies in neuroblastoma.
ISSN:2073-4409
2073-4409
DOI:10.3390/cells10051001