2'-Hydroxycinnamaldehyde induces apoptosis through HSF1-mediated BAG3 expression

Nguyen,Hai-Anh; Kim,Soo-A

doi:10.3892/ijo.2016.3790

2'-Hydroxycinnamaldehyde induces apoptosis through HSF1-mediated BAG3 expression

Authors:
- Hai-Anh Nguyen
- Soo-A Kim
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Affiliations: Department of Biochemistry, Dongguk University College of Oriental Medicine, Gyeongju 780-714, Republic of Korea
Published online on: December 6, 2016 https://doi.org/10.3892/ijo.2016.3790
Pages: 283-289

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Abstract

BAG3, a member of BAG co-chaperone family, is induced by stressful stimuli such as heat shock and heavy metals. Through interaction with various binding partners, BAG3 is thought to play a role in cellular adaptive responses against stressful conditions in normal and neoplastic cells. 2'-Hydroxycinnamaldehyde (HCA) is a natural derivative of cinnamaldehyde and has antitumor activity in various cancer cells. In the present study, for the first time, we identified that HCA induced BAG3 expression and BAG3-mediated apoptosis in cancer cells. The apoptotic cell death induced by HCA was demonstrated by caspase-7, -9 and PARP activation, and confirmed by Annexin V staining in both SW480 and SW620 colon cancer cells. Notably, both the mRNA and protein levels of BAG3 were largely induced by HCA in a dose- and time-dependent manner. By showing transcription factor HSF1 activation, we demonstrated that HCA induces the expression of BAG3 through HSF1 activation. More importantly, knockdown of BAG3 expression using siRNA largely inhibited HCA-induced apoptosis, suggesting that BAG3 is actively involved in HCA-induced cancer cell death. Considering the importance of the stress response mechanism in cancer progression, our results strongly suggest that BAG3 could be a potential target for anticancer therapy.

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