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SPRTN is involved in hepatocellular carcinoma development through the ER stress response

A Correction to this article was published on 10 April 2024

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Abstract

Endoplasmic reticulum (ER) stress, prompted by the accumulation of misfolded or unfolded proteins, triggers the activation of the unfolded protein response (UPR) pathway to restore ER homeostasis. This stress response is implicated in the development of hepatocellular carcinoma (HCC). A biallelic mutation in SPRTN is currently the only known single-gene mutation implicated in the early onset of HCC. However, the exact mechanism linking SPRTN mutations to HCC remains unclear. In our study, we analyzed SPRTN and UPR in 21 human HCC tissue samples using RT-qPCR, immunoblot, and immunohistochemistry. We found alterations in the expression levels of SPRTN and UPR-related genes and proteins in HCC samples. The impact of SPRTN on the ER stress response was assessed in SPRTN-depleted HepG2 cells through RNA sequencing, pull-down assay, comet assay, and mitotic index calculation. We demonstrated that SPRTN interacts with the UPR sensor GRP78. Furthermore, we observed a decrease in SPRTN levels during ER stress, and increased sensitivity to ER stress in SPRTN-depleted cells. These findings suggest an essential role for SPRTN in the ER stress response and provide new insights into HCC pathogenesis. This newly discovered function of SPRTN could significantly enhance our understanding and treatment of HCC.

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Fig. 1: SPRTN is involved in the ER stress response.
Fig. 2: Gene expression and protein level analysis under ER stress.
Fig. 3: SPRTN and ER stress response factors are altered in HCC.
Fig. 4: ER stress is a key element of HCC and SPRTN is essential for preventing DNA damage during ER stress.
Fig. 5: RNA degradation and protein aggregation in ER stress response are influenced by SPRTN.

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Data availability

The RNA sequencing dataset generated and analyzed during the current study is available in the Gene Expression Omnibus (GEO, NCBI) using GEO Series accession number GSE237978. The human hepatocellular carcinoma dataset used for the comparison during the current study is available in the Cancer Genome Atlas (TCGA) repository: https://www.cancer.gov/tcga.

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Acknowledgements

We thank Prof. Ivan Dikic for his valuable advice and support.

Funding

Funding was provided by the Croatian Science Foundation HRZZ (IP-2016-06-3097) and the University of Split School of Medicine. The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Contributions

All authors contributed to the study conceptualization and design, material preparation, data collection, and analysis. The original draft of the manuscript was written by Anja Batel, Mirjana Polović, Mateo Glumac, and Ivana Marinović Terzić. All authors read and approved the final manuscript.

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Correspondence to Ivana Marinović Terzić.

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Competing interests

The authors declare no competing interests.

Compliance with ethical standards

The study protocol was approved by the Medical Ethics Committee of the University of Split, School of Medicine (003-08/20-03/0005) and the Clinical Hospital Merkur, Zagreb (0311-7732-3) in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Informed written consent for the collection of liver specimens was obtained from each individual participant included in the study. No individual person’s data in any form, including individual details, images or videos was used in the publication.

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Batel, A., Polović, M., Glumac, M. et al. SPRTN is involved in hepatocellular carcinoma development through the ER stress response. Cancer Gene Ther 31, 376–386 (2024). https://doi.org/10.1038/s41417-023-00708-w

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