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01.03.2015 | Basic Science

BAG3 protects against hyperthermic stress by modulating NF-κB and ERK activities in human retinoblastoma cells

verfasst von: Tatsuya Yunoki, Yoshiaki Tabuchi, Atsushi Hayashi, Takashi Kondo

Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology | Ausgabe 3/2015

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Abstract

Purpose

BCL2-associated athanogene 3 (BAG3), a co-chaperone of HSP70, is a cytoprotective and anti-apoptotic protein that acts against various stresses, including heat stress. Here, we examined the effect of BAG3 on the sensitivity of human retinoblastoma cells to hyperthermia (HT).

Methods

We examined the effects of BAG3 knockdown on the sensitivity of Y79 and WERI-Rb-1cells to HT (44 °C, 1 h) by evaluating apoptosis and cell proliferation using western blotting, real-time quantitative PCR (qPCR), flow cytometry, and a WST-8 assay kit. Furthermore, we examined the effects of activating nuclear factor-kappa B (NF-κB) and extracellular signal-regulated kinase (ERK) using western blotting and real time qPCR.

Results

HT induced considerable apoptosis along with the activation of caspase-3 and chromatin condensation. The sensitivity of Y79 and WERI-Rb-1 cells to HT was significantly enhanced by BAG3 knockdown. Compared to HT alone, the combination of BAG3 knockdown and HT reduced phosphorylation of the inhibitors of kappa B α (IκBα) and p65, a subunit of NF-κB, and degraded IκB kinase γ (IKKγ) during the recovery period after HT. Furthermore, BAG3 knockdown increased the HT-induced phosphorylation of ERK after HT treatment, and the ERK inhibitor U0126 significantly improved the viability of the cells treated with a combination of BAG3 knockdown and HT.

Conclusions

The silencing of BAG3 seems to enhance the effects of HT, at least in part, by maintaining HT-induced inactivity of NF-κB and the phosphorylation of ERK. These findings indicate that BAG3 may be a potential molecular target for modifying the outcomes of HT in retinoblastoma.

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Titel: BAG3 protects against hyperthermic stress by modulating NF-κB and ERK activities in human retinoblastoma cells
verfasst von: Tatsuya Yunoki
Yoshiaki Tabuchi
Atsushi Hayashi
Takashi Kondo
Publikationsdatum: 01.03.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology / Ausgabe 3/2015
Print ISSN: 0721-832X
Elektronische ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-014-2874-1

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BAG3 protects against hyperthermic stress by modulating NF-κB and ERK activities in human retinoblastoma cells

Abstract

Purpose

Methods

Results

Conclusions

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