- Title
- BAG3-dependent expression of Mcl-1 confers resistance of mutant KRAS colon cancer cells to the HSP90 inhibitor AUY922
- Creator
- Wang, Chun Yan; Guo, Su Tang; Croft, Amanda; Yan, Xu Guang; Jin, Lei; Zhang, Xu Dong; Jiang, Chen Chen
- Relation
- Funding BodyNHMRCGrant Number1002857 http://purl.org/au-research/grants/nhmrc/1002857
- Relation
- Molecular Carcinogenesis Vol. 57, Issue 2, p. 284-294
- Publisher Link
- http://dx.doi.org/10.1002/mc.22755
- Publisher
- John Wiley & Sons
- Resource Type
- journal article
- Date
- 2018
- Description
- Past studies have shown that mutant KRAS colon cancer cells are susceptible to apoptosis induced by the HSP90 inhibitor AUY922. Nevertheless, intrinsic and acquired resistance remains an obstacle for the potential application of the inhibitor in the treatment of the disease. Here we report that Mcl-1 is important for survival of colon cancer cells in the presence of AUY922. Mcl-1 was upregulated in mutant KRAS colon cancer cells selected for resistance to AUY922-induced apoptosis. This was due to its increased stability mediated by Bcl-2-associated athanogene domain 3 (BAG3), which was also increased in resistant colon cancer cells by heat shock factor 1 (HSF1) as a result of chronic endoplasmic reticulum (ER) stress. Functional investigations demonstrated that inhibition of Mcl-1, BAG3, or HSF1 triggered apoptosis in resistant colon cancer cells, and rendered AUY922-naïve colon cancer cells more sensitive to the inhibitor. Together, these results identify that the HSF1-BAG3-Mcl-1 signal axis is critical for protection of mutant KRAS colon cancer cells from AUY922-induced apoptosis, with potential implications for targeting HSF1/BAG3/Mcl-1 to improve the efficacy of AUY922 in the treatment of colon cancer.
- Subject
- AUY922; BAG3; colon cancer; heat shock protein 90; Mcl-1
- Identifier
- http://hdl.handle.net/1959.13/1390054
- Identifier
- uon:32985
- Identifier
- ISSN:0899-1987
- Rights
- This is the pre-peer reviewed version of above article, which has been published in final form at http://dx.doi.org/10.1002/mc.22755. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
- Language
- eng
- Full Text
- Reviewed
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