ArticleCell death and differentiation2023
iASPP suppression mediates terminal UPR and improves BRAF-inhibitor sensitivity of colon cancers.
Article in Cell death and differentiation, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.
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16 citing papers in PubMed, 18 citations in OpenAlex.
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- LncRNA-Gm5532 deficiency alleviates bone resorption by inhibiting mitochondrial respiration through iASPP/NRF2.Cell biology and toxicology · 2026Article
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- QRICH1 suppresses pediatric T-cell acute lymphoblastic leukemia by inhibiting GRP78.Cell death & disease · 2024Article
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- Pentapeptide PYRAE triggers ER stress-mediated apoptosis of breast cancer cells in mice by targeting RHBDF1-BiP interaction.Acta pharmacologica Sinica · 2024Article
- FBXO5-mediated RNF183 degradation prevents endoplasmic reticulum stress-induced apoptosis and promotes colon cancer progression.Cell death & disease · 2024Article
- PANoptosis-related genes function as efficient prognostic biomarkers in colon adenocarcinoma.Frontiers in endocrinology · 2024Article
- Activated KRAS, polyamines, iASPP and TME: a multiple liaison in pancreatic cancer.Cell death and differentiation · 2023Article
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8 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Unfolded protein response (UPR) signaling is activated under endoplasmic reticulum (ER) stress, an emerging cancer hallmark, leading to either adaptive survival or cell death, while the mechanisms underlying adaptation-death switch remain poorly understood. Here, we examined whether oncogene iASPP regulates the switch and how the mechanisms can be used in colon cancer treatment. iASPP is downregulated when cells undergo transition from adaptation to death during therapy-induced ER stress. Blocking iASPP's downregulation attenuates stress-induced cell death. Mechanistically, Hu-antigen R (HuR)-mediated stabilization of iASPP mRNA and subsequent iASPP protein production is significantly impaired with prolonged ER stress, which facilitates the degradation of GRP78, a key regulator of the UPR, in the cytosol. Because iASPP competes with GRP78 in binding the ER-resident E3 ligase RNF185, and tips the balance in favor of cell death. Positive correlation between the levels of HuR, iASPP, and GRP78 are detectable in colon cancer tissues in vivo. Genetic inhibition of iASPP/GRP78 or chemical inhibition of HuR not only inhibits tumor growth, but also sensitizes colon cancer cells' responses to BRAF inhibitor-induced ER stress and cell death. This study provides mechanistic insights into the switch between adaptation and death during ER stress, and also identifies a potential strategy to improve BRAF-inhibitor efficiency in colon cancers.
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