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NRAS mutant dictates AHCYL1-governed ER calcium homeostasis for tumor growth

ABSTRACT: Calcium homeostasis is critical for cell proliferation, and emerging evidence shows that cancer cells exhibit altered calcium signals to fulfill their need for proliferation. However, it remains unclear whether there are oncogene-specific calcium homeostasis regulations that can expose novel therapeutic targets. Here, from RNAi screen, we report that adenosylhomocysteinase like protein 1 (AHCYL1), a suppressor of the endoplasmic reticulum (ER) calcium channel protein inositol trisphosphate receptor (IP3R), is selectively upregulated and critical for cell proliferation and tumor growth potential of human NRAS-mutated melanoma, but not for melanoma expressing BRAF V600E. Mechanistically, AHCYL1 deficiency results in decreased ER calcium levels, activates the unfolded protein response (UPR), and triggers downstream apoptosis. In addition, we show that AHCYL1 transcription is regulated by activating transcription factor 2 (ATF2) in NRAS-mutated melanoma. Our work provides evidence for oncogene-specific calcium regulations and suggests AHCYL1 as a novel therapeutic target for RAS mutant-expressing human cancers, including melanoma.

ORGANISM(S): Homo sapiens

PROVIDER: GSE253246 | GEO | 2024/01/15

REPOSITORIES: GEO

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Atf-6 regulates lifespan through ER-mitochondrial calcium homeostasis

Project description:Functional crosstalk between organelles is critical for maintaining cellular homeostasis. Individually, dysfunction of both endoplasmic reticulum (ER) and mitochondria have been linked to cellular and organismal aging, but little is known about how mechanisms of inter-organelle communication might be targeted to extended longevity. The metazoan unfolded protein response (UPR) maintains ER health through a variety of mechanisms beyond its canonical role in proteostasis, including calcium storage and lipid metabolism. Here we provide evidence that in C. elegans, inhibition of the conserved UPR mediator, activating transcription factor (atf)-6 increases lifespan via modulation of calcium homeostasis and signaling to the mitochondria. Loss of atf-6 confers long life via downregulation of the ER calcium buffering protein, calreticulin. Function of the ER calcium release channel, the inositol triphosphate receptor (IP3R/itr-1), is required for atf-6 mutant longevity while a gain-of-function IP3R/itr-1 mutation is sufficient to extend lifespan. IP3R dysfunction leads to altered mitochondrial behavior and hyperfused morphology, which is sufficient to suppress long life in atf-6 mutants. Highlighting a novel and direct role for this inter-organelle coordination of calcium in longevity, the mitochondrial calcium import channel, mcu-1, is also required for atf-6 mutant longevity. Altogether this study reveals the importance of organellar coordination of calcium handling in determining the quality of aging, and highlights calcium homeostasis as a critical output for the UPR and atf-6 in particular.

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Project description:NRAS-mutated melanoma lacks an approved first-line treatment. Metabolic reprogramming is considered a novel target to control cancer; however, it is mostly unknow how the NRAS oncogene contributes to this cancer hallmark. Here, we show that NRASQ61-mutated melanomas harbor specific metabolic alterations that render cells sensitive to sorafenib upon metabolic stress. Mechanistically, these cells seem to depend on glucose metabolism, as glucose deprivation promotes the switch of the RAF isoform used from CRAF to BRAF. This process contributes to cell survival and sustains glucose metabolism through the phosphorylation of 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase 2/6- phosphofructo-2-kinase/fructose-2,6-bisphosph 3 (PFKFB2/PFKFB3) heterodimers by BRAF. In turn, this phosphorylation favors the allosteric activation of phosphofructokinase-1 (PFK1), generating a feedback loop linking glycolysis and the RAS signaling pathway. In vivo treatment of NRASQ61 mutant melanomas, including patient-derived xenografts, with the combination of 2-deoxy-D-glucose (2-DG) and sorafenib effectively inhibits tumor growth. Thus, we provide evidence of the contributions of NRAS oncogenes to metabolic rewiring and proof of principle for the treatment of NRAS-mutated melanoma with combinations of metabolic stress (glycolysis inhibitors) and already approved drugs such as sorafenib.

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Transcriptional response to TNF-alpha in a panel of 17 human melanoma cell lines

2014-02-10 | GSE51221 | GEO

Transcriptional response to TNF-alpha in a panel of 17 human melanoma cell lines

Project description:A panel of 17 human melanoma cell lines with known BRAF and NRAS mutation status was stimulated with TNF-alpha for 72 hours. The goal of the study was to correlate the transcriptional response in BRAF versus NRAS mutated melanoma cell lines. Total RNA was obtained from a panel of 17 human melanoma cell lines treated for 72 hours with TNF-alpha or left untreated. Gene expression profiling was done using the Illumina Human HT12 v4 platform.

2014-02-10 | E-GEOD-51221 | biostudies-arrayexpress

Somatic Activation of KIT in Distinct Subtypes of Melanoma

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2016-09-08 | E-GEOD-62827 | biostudies-arrayexpress

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Project description:Mutations in the NRAS oncogene are present in up to 20% of melanoma. Here, we show that interferon alpha-inducible protein 6 (IFI6) is necessary for NRASQ61K-induced transformation and melanoma growth. IFI6 was transcriptionally upregulated by NRASQ61K, and knockdown of IFI6 resulted in DNA replication stress due to dysregulated DNA replication via E2F2. This stress consequentially inhibited cellular transformation and melanoma growth via senescence or apoptosis induction depending on the RB and p53 pathway status of the cells. NRAS-mutant melanoma were significantly more resistant to the cytotoxic effects of DNA replication stress-inducing drugs, and knockdown of IFI6 increased sensitivity to these drugs. Pharmacological inhibition of IFI6 expression by the MEK inhibitor trametinib, when combined with DNA replication stress-inducing drugs, blocked NRAS-mutant melanoma growth. Collectively, we demonstrate that IFI6, via E2F2 regulates DNA replication and melanoma development and growth, and this pathway can be pharmacologically targeted to inhibit NRAS-mutant melanoma. YUGASP cells stably expressing a non-silencing shRNA or two individual shRNAs against IFI6 were used to prepare the total RNA, which was then used to analyze for gene expression using Illumina expression array.

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