A novel CSN5/CRT O-GlcNAc/ER stress regulatory axis in platinum resistance of epithelial ovarian cancer

Yan, Tianqing; Ma, Xiaolu; Zhou, Kaixia; Cao, Jiazhen; Tian, Yanan; Zheng, Hui; Tong, Ying; Xie, Suhong; Wang, Yanchun; Guo, Lin; Lu, Renquan

doi:10.7150/ijbs.89700

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International Journal of Medical Sciences

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Int J Biol Sci 2024; 20(4):1279-1296. doi:10.7150/ijbs.89700 This issue Cite

Research Paper

A novel CSN5/CRT O-GlcNAc/ER stress regulatory axis in platinum resistance of epithelial ovarian cancer

Tianqing Yan^1,2,#, Xiaolu Ma^1,2,#, Kaixia Zhou^1,2,#, Jiazhen Cao^1,2, Yanan Tian^1,2, Hui Zheng¹, Ying Tong¹, Suhong Xie¹, Yanchun Wang¹, Lin Guo^1,2,✉, Renquan Lu^1,2,✉

1. Department of Clinical Laboratory, Fudan University Shanghai Cancer Center, No.270, Dong' An Road, Xuhui District, Shanghai 200032, China.
2. Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China.
^# These authors contributed equally to this work.

Citation:

Yan T, Ma X, Zhou K, Cao J, Tian Y, Zheng H, Tong Y, Xie S, Wang Y, Guo L, Lu R. A novel CSN5/CRT O-GlcNAc/ER stress regulatory axis in platinum resistance of epithelial ovarian cancer. Int J Biol Sci 2024; 20(4):1279-1296. doi:10.7150/ijbs.89700. https://www.ijbs.com/v20p1279.htm

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Abstract

Background: High levels of COP9 signalosome subunit 5 (CSN5) in epithelial ovarian cancer (EOC) are associated with poor prognosis and are implicated in mediating platinum resistance in EOC cells. The underlying mechanisms, however, remained undefined. This study aimed to elucidate the molecular process and identify potential therapeutic targets.

Methods: RNA-sequencing was used to investigate differentially expressed genes between platinum-resistant EOC cells with CSN5 knockdown and controls. O-GlcNAc proteomics were employed to identify critical modulators downstream of CSN5. The omics findings were confirmed through qRT-PCR and immunoblotting. In vitro and in vivo experiments assessed the sensitivity of resistant EOCs to platinum.

Results: We demonstrated an involvement of aberrant O-GlcNAc and endoplasmic reticulum (ER) stress disequilibrium in CSN5-mediated platinum resistance of EOC. Genetic or pharmacologic inhibition of CSN5 led to tumor regression and surmounted the intrinsic EOC resistance to platinum both in vitro and in vivo. Integration of RNA-sequencing and O-GlcNAc proteomics pinpointed calreticulin (CRT) as a potential target of aberrant O-GlcNAc modification. CSN5 upregulated O-GlcNAc-CRT at T346 to inhibit ER stress-induced cell death. Blocking T346 O-GlcNAc-CRT through CSN5 deficiency or T346A mutation resulted in Ca²⁺ disturbances, followed by ER stress overactivation, mitochondrial dysfunction, and ultimately cell apoptosis.

Conclusion: This study reveals that CSN5-mediated aberrant O-GlcNAc-CRT acts as a crucial ER stress checkpoint, governing cell fate response to stress, and emphasizes an unrecognized role for the CSN5/CRT O-GlcNAc/ER stress axis in platinum resistance of EOC.

Keywords: COP9 signalosome subunit 5, Calreticulin O-GlcNAcylation, Endoplasmic reticulum stress, Ovarian cancer, Platinum resistance

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APA

Yan, T., Ma, X., Zhou, K., Cao, J., Tian, Y., Zheng, H., Tong, Y., Xie, S., Wang, Y., Guo, L., Lu, R. (2024). A novel CSN5/CRT O-GlcNAc/ER stress regulatory axis in platinum resistance of epithelial ovarian cancer. International Journal of Biological Sciences, 20(4), 1279-1296. https://doi.org/10.7150/ijbs.89700.

ACS

Yan, T.; Ma, X.; Zhou, K.; Cao, J.; Tian, Y.; Zheng, H.; Tong, Y.; Xie, S.; Wang, Y.; Guo, L.; Lu, R. A novel CSN5/CRT O-GlcNAc/ER stress regulatory axis in platinum resistance of epithelial ovarian cancer. Int. J. Biol. Sci. 2024, 20 (4), 1279-1296. DOI: 10.7150/ijbs.89700.

NLM

CSE

Yan T, Ma X, Zhou K, Cao J, Tian Y, Zheng H, Tong Y, Xie S, Wang Y, Guo L, Lu R. 2024. A novel CSN5/CRT O-GlcNAc/ER stress regulatory axis in platinum resistance of epithelial ovarian cancer. Int J Biol Sci. 20(4):1279-1296.

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