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Janus kinase 1 plays a critical role in mammary cancer progression

ABSTRACT: Janus kinase 1 plays a critical role in mammary cancer progression

PROVIDER: PRJNA495488 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7992760.fastq.gz	Fastqsanger.gz
	SRR7992761.fastq.gz	Fastqsanger.gz
	SRR7992762.fastq.gz	Fastqsanger.gz
	SRR7992763.fastq.gz	Fastqsanger.gz
	SRR7992764.fastq.gz	Fastqsanger.gz

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Janus kinase 1 plays a critical role in mammary cancer progression

Project description:Janus kinases (JAKs) and their downstream STAT proteins play key roles in cytokine signaling, tissue homeostasis, and cancer development. Using a novel breast cancer model that conditionally lacks the Janus kinase 1, we show here that JAK1 is essential for IL-6 class inflammatory cytokine signaling and plays a critical role in metastatic cancer progression. JAK1 is indispensable for the oncogenic activation of STAT1, STAT3, and STAT6 in ERBB2-expressing cancer cells, suggesting that ERBB2 receptor tyrosine kinase complexes do not directly activate these STAT proteins in vivo. A genome-wide gene expression analysis revealed that JAK1 signaling has pleiotropic effects on several pathways associated with cancer progression. We established that FOS and MAP3K8 are targets of JAK1/STAT3 signaling that promote tumorsphere formation and cell migration. The results highlight the significance of JAK1 as a rational therapeutic target to block IL-6 class cytokines that are master regulators of cancer-associated inflammation.

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Janus Kinase 1 Plays a Critical Role in Mammary Cancer Progression.

Project description:Janus kinases (JAKs) and their downstream STAT proteins play key roles in cytokine signaling, tissue homeostasis, and cancer development. Using a breast cancer model that conditionally lacks Janus kinase 1, we show here that JAK1 is essential for IL-6-class inflammatory cytokine signaling and plays a critical role in metastatic cancer progression. JAK1 is indispensable for the oncogenic activation of STAT1, STAT3, and STAT6 in ERBB2-expressing cancer cells, suggesting that ERBB2 receptor tyrosine kinase complexes do not directly activate these STAT proteins in vivo. A genome-wide gene expression analysis revealed that JAK1 signaling has pleiotropic effects on several pathways associated with cancer progression. We established that FOS and MAP3K8 are targets of JAK1/STAT3 signaling, which promotes tumorsphere formation and cell migration. The results highlight the significance of JAK1 as a rational therapeutic target to block IL-6-class cytokines, which are master regulators of cancer-associated inflammation.

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Janus kinase 1 is essential for inflammatory cytokine signaling and mammary gland remodeling

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Project description:Inflammatory cytokines promote the development of pancreatic ductal adenocarcinoma (PDAC), but the functions of specific intracellular signaling mediators in this process are less well-defined. In this study, we discovered that the Janus kinase 1 (JAK1) is critical for the early postnatal growth of the exocrine pancreas. Using a ligand-controlled and pancreas-specific knockout in adult mice, we demonstrate that JAK1 deficiency prevents the formation of KRASG12D-induced pancreatic tumors, and we established that JAK1 is essential for the constitutive activation of STAT3 whose activation is a prominent characteristic of PDAC. We identified C/EBPδ as a biologically relevant downstream target of JAK1 signaling, which is upregulated in human PDAC. Reinstating the expression of C/EBPδ was sufficient to rescue the growth of JAK1-deficient tumorspheres. Collectively, the findings of this study suggest that JAK1 executes important functions of inflammatory cytokines through C/EBPδ and may serve as a molecular target for PDAC prevention and treatment.

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