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The NALCN channel regulates metastasis and non-malignant cell dissemination

ABSTRACT: The NALCN channel regulates metastasis and non-malignant cell dissemination

PROVIDER: PRJNA863884 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR20721500.fastq.gz	Fastqsanger.gz
	SRR20721600.fastq.gz	Fastqsanger.gz
	SRR20721700_1.fastq.gz	Fastqsanger.gz
	SRR20721700_2.fastq.gz	Fastqsanger.gz
	SRR20721501.fastq.gz	Fastqsanger.gz

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The NALCN channel regulates metastasis and non-malignant cell dissemination (scRNA-Seq)

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The NALCN channel regulates metastasis and non-malignant cell dissemination (scRNA-Seq)

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Project description:Cancer metastasis requires the transient activation of cellular programs enabling dissemination and seeding in distant organs. Genetic, transcriptional and translational heterogeneity contributes to this dynamic process. Metabolic heterogeneity has also been observed, yet its role for cancer progression is less explored. Here, we discover that loss of phosphoglycerate dehydrogenase (PHGDH) potentiates metastatic dissemination. Specifically, we find that heterogeneous or low PHGDH expression in primary tumors of breast cancer patients is associated with decreased metastasis free survival time. In mice, circulating tumor cells and early metastatic lesions are enriched with PHGDH low cancer cells and silencing PHGDH in primary tumors increases metastasis formation. Mechanistically, PHGDH protein interacts with the glycolytic enzyme phosphofructokinase (PFK) and the loss of this interaction activates the hexosamine – sialic acid pathway, which provides precursors for protein glycosylation. Consequently, aberrant protein glycosylation including increased sialylation of integrin αvβ3 occurs, which potentiates cell migration and invasion. Inhibition of sialic acid metabolism counteracts the metastatic capacity of PHGDH low cancer cells. In conclusion, while the catalytic activity of PHGDH supports cancer cell proliferation, low PHGDH protein expression non-catalytically potentiates cancer dissemination and metastasis formation. Thus, the presence of PHDGH heterogeneity in primary tumors may be considered a sign of tumor aggressiveness.

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Project description:We identify the sodium leak channel non-selective protein (NALCN) as a key regulator of cancer metastasis and nonmalignant cell dissemination. Among 10,022 human cancers, NALCN loss-of-function mutations were enriched in gastric and colorectal cancers. Deletion of Nalcn from gastric, intestinal or pancreatic adenocarcinomas in mice did not alter tumor incidence, but markedly increased the number of circulating tumor cells (CTCs) and metastases. Treatment of these mice with gadolinium-a NALCN channel blocker-similarly increased CTCs and metastases. Deletion of Nalcn from mice that lacked oncogenic mutations and never developed cancer caused shedding of epithelial cells into the blood at levels equivalent to those seen in tumor-bearing animals. These cells trafficked to distant organs to form normal structures including lung epithelium, and kidney glomeruli and tubules. Thus, NALCN regulates cell shedding from solid tissues independent of cancer, divorcing this process from tumorigenesis and unmasking a potential new target for antimetastatic therapies.

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