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Cancer Chemotherapy and Pharmacology

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01.11.2009 | Original Article

Enhancement of cisplatin cytotoxicity by SAHA involves endoplasmic reticulum stress-mediated apoptosis in oral squamous cell carcinoma cells

verfasst von: Maiko Suzuki, Manabu Endo, Fumiaki Shinohara, Seishi Echigo, Hidemi Rikiishi

Erschienen in: Cancer Chemotherapy and Pharmacology | Ausgabe 6/2009

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Abstract

Purpose

The histone deacetylase inhibitor, suberoylanilide hydroxamic acid (SAHA), enhances cisplatin [cis-diammine dichloroplatinum (II)] (CDDP)-induced apoptosis in the oral squamous cell carcinoma (OSCC) cell line by complex, multifunctional mechanisms. We investigated the role of endoplasmic reticulum (ER) stress in the enhancing effect of SAHA on CDDP, compared with the ER stressor thapsigargin.

Methods

We chose OSCC cell line HSC-3 to ascertain the mechanism of SAHA-enhanced cytotoxicity among various cell lines. HSC-3 cells were incubated with CDDP/SAHA for 48 h, followed by the assessment of cell chemosensitivity to CDDP with MTT and TUNEL assays. Western blot analysis was used to detect the expressions of ER-related molecules, and flow cytometry was used to monitor caspase activity.

Results

Treatment with CDDP/SAHA potently induced apoptosis in HSC-3 cells with a significant increase in caspase-4 and -12 functions. For example, 60% of cells became apoptotic after 48 h of treatment with CDDP/SAHA. In addition, SAHA alone rapidly induced sustained phosphorylation of eukaryotic translation initiation factor-2 (eIF2)α, which is up-regulated during ER stress. Inhibition of ER stress by salubrinal, an inhibitor of eIF2α dephosphorylation, abrogated SAHA’s enhancement of CDDP cytotoxicity. Levels of phospho-Akt are decreased in SAHA-treated cells, and this is in turn associated with increased activity of protein phosphatase 1 (PP1) by SAHA, the phosphatase upstream of Akt.

Conclusion

These data indicate that up-regulation of specific-ER stress-associated events is an integral part of the mechanism by which SAHA enhances CDDP-induced apoptosis, and PP1 up-regulation followed by Akt dephosphorylation plays an important role in SAHA-enhanced CDDP apoptosis.

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Titel: Enhancement of cisplatin cytotoxicity by SAHA involves endoplasmic reticulum stress-mediated apoptosis in oral squamous cell carcinoma cells
verfasst von: Maiko Suzuki
Manabu Endo
Fumiaki Shinohara
Seishi Echigo
Hidemi Rikiishi
Publikationsdatum: 01.11.2009
Verlag: Springer-Verlag
Erschienen in: Cancer Chemotherapy and Pharmacology / Ausgabe 6/2009
Print ISSN: 0344-5704
Elektronische ISSN: 1432-0843
DOI: https://doi.org/10.1007/s00280-009-0969-x

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Enhancement of cisplatin cytotoxicity by SAHA involves endoplasmic reticulum stress-mediated apoptosis in oral squamous cell carcinoma cells

Abstract

Purpose

Methods

Results

Conclusion

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Springer Medizin

Abstract

Purpose

Methods

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Conclusion

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