Ophiobolin A Kills Human Glioblastoma Cells by Inducing Endoplasmic Reticulum Stress Via Disruption of Thiol Proteostasis

Overview

Journal Oncotarget

Specialty Oncology

Date 2018 Jan 2

PMID 29290985

Citations 13

Authors

In Young Kim

Miri Kwon

Min-Koo Choi

Dongjoo Lee

Dong Min Lee

Min Ji Seo

Kyeong Sook Choi

Affiliations

Soon will be listed here.

Abstract

Ophiobolin A (OP-A), a fungal sesterterpene from , was recently shown to have anti-glioma activity. We show here that OP-A induces paraptosis-like cell death accompanied by dilation of the endoplasmic reticulum (ER) in glioma cells, and that CHOP-mediated ER stress plays a critical role in this process. OP-A-induced ER-derived dilation and cell death were found to be independent of reactive oxygen species, but were effectively blocked by various thiol antioxidants. We observed that OP-A can react with cysteinyl thiols to form Michael adducts, suggesting that the ability of OP-A to covalently modify free sulfhydryl groups on proteins may cause protein misfolding and the accumulation of misfolded proteins, leading to paraptosis-like cell death. Taken together, these results indicate that the disruption of thiol proteostasis may critically contribute to the anti-glioma activity of OP-A.

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