Cited by 66Histone Deacetylase Inhibitors ResearchGenomics and Chromatin DynamicsMicrotubule and mitosis dynamics

HDAC8 inhibition blocks SMC3 deacetylation and delays cell cycle progression without affecting cohesin-dependent transcription in MCF7 cancer cells

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Dasgupta, Tanushree, Antony, Jisha, Braithwaite, Antony W., Horsfield, Julia A.·2016·Journal of Biological Chemistry

Abstract

Cohesin, a multi-subunit protein complex involved in chromosome organization, is frequently mutated or aberrantly expressed in cancer. Multiple functions of cohesin, including cell division and gene expression, highlight its potential as a novel therapeutic target. The SMC3 subunit of cohesin is acetylated (ac) during S phase to establish cohesion between replicated chromosomes. Following anaphase, ac-SMC3 is deacetylated by HDAC8. Reversal of SMC3 acetylation is imperative for recycling cohesin so that it can be reloaded in interphase for both non-mitotic and mitotic functions. We blocked deacetylation of ac-SMC3 using an HDAC8-specific inhibitor PCI-34051 in MCF7 breast cancer cells, and examined the effects on transcription of cohesin-dependent genes that respond to estrogen. HDAC8 inhibition led to accumulation of ac-SMC3 as expected, but surprisingly, had no influence on the transcription of estrogen-responsive genes that are altered by siRNA targeting of RAD21 or SMC3. Knockdown of RAD21 altered estrogen receptor α (ER) recruitment at SOX4 and IL20, and affected transcription of these genes, while HDAC8 inhibition did not. Rather, inhibition of HDAC8 delayed cell cycle progression, suppressed proliferation and induced apoptosis in a concentration-dependent manner. We conclude that HDAC8 inhibition does not change the estrogen-specific transcriptional role of cohesin in MCF7 cells, but instead, compromises cell cycle progression and cell survival. Our results argue that candidate inhibitors of cohesin function may differ in their effects depending on the cellular genotype and should be thoroughly tested for predicted effects on cohesin's mechanistic roles.

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Crossref · 10.1074/jbc.m115.704627

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Authors
Dasgupta, T., Antony, J., Braithwaite, A. W., & Horsfield, J. A.
Affiliations
  • University of Otago (NZ)
  • University of Auckland (NZ)
Corresponding author
Horsfield, Julia A.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2016-06
Volume
291
Issue
24
Pages
12761-12770
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2339371539
Cited by
62
References
48
Citations by year
2026: 6 · 2025: 5 · 2024: 7 · 2023: 5 · 2022: 11 · 2021: 9 · 2020: 6 · 2019: 5 · 2018: 4 · 2017: 3 · 2016: 1
FWCI
2.25
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Health Research Council of New Zealand (10–873, 15–229, 13–161, 14–219, 15–500)
  • Cancer Society of New Zealand (11–18)
  • Genesis Oncology Trust
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Histone Deacetylase Inhibitors Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
Keywords
cohesin, cell cycle progression, MCF-7 cells, estrogen receptor alpha, RAD21, SOX4, apoptosis, cell proliferation
MeSH terms
Cohesins, Acetylation, Breast Neoplasms, Chromosomal Proteins, Non-Histone, DNA-Binding Proteins, Dose-Response Relationship, Drug, Estrogens, Female, Histone Deacetylases, Humans, Hydroxamic Acids, Indoles, Nuclear Proteins, Phosphoproteins, Chondroitin Sulfate Proteoglycans, Receptors, Estrogen, Repressor Proteins, Transcription, Genetic, Immunoblotting, Gene Expression Regulation, Neoplastic, Apoptosis, Microscopy, Confocal, Cell Cycle Proteins, Reverse Transcriptase Polymerase Chain Reaction, RNA Interference, Cell Proliferation, Cell Cycle Checkpoints, MCF-7 Cells

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