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Genome wide screen of CREB and CRTC2 occupancy in LKB1 mutant NSCLC cell line A549

ABSTRACT: Genome wide screen of CREB and CRTC2 occupancy in LKB1 mutant NSCLC cell line A549

PROVIDER: PRJNA529194 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8787164.fastq.gz	Fastqsanger.gz
	SRR8787165.fastq.gz	Fastqsanger.gz
	SRR8787166.fastq.gz	Fastqsanger.gz
	SRR8787167.fastq.gz	Fastqsanger.gz
	SRR8787168.fastq.gz	Fastqsanger.gz

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Project description:Populations of circulating immune cells are maintained in equilibrium through signals that enhance the retention or egress of hematopoietic stem cells (HSCs) from bone marrow (BM). Prostaglandin E2 (PGE2) stimulates HSC renewal and engraftment, for example, via induction of the cAMP pathway. Triggering of PGE2 receptors increases HSC survival in part via the PKA-mediated induction of the CREB signaling pathway. PKA stimulates cellular gene expression by phosphorylating CREB at Ser133 and by promoting the dephosphorylation of the cAMP Responsive Transcriptional Coactivators (CRTCs). We show here that disruption of both CRTC2 and CRTC3 causes embryonic lethality, and that a single allele of either CRTC2 or CRTC3 is sufficient for viability. CRTC2 knockout mice that express one CRTC3 allele (CRTC2/3m mice) develop neutrophilia and splenomegaly in adulthood due to the up-regulation of Granulocyte-Colony Stimulating Factor (G-CSF); these effects are reversed following administration of neutralizing anti-G-CSF antiserum. Adoptive transfer of CRTC2/3m BM conferred the splenomegaly/neutrophilia phenotype on WT recipients. Indeed, targeted disruption of both CRTC2 and CRTC3 in stromal cells with a mesenchymal Prx1-Cre transgene also promoted this phenotype. Depletion of CRTC2/3 was found to decrease the expression of Suppressor of Cytokine Signaling 3 (SOCS3), leading to increases in STAT3 phosphorylation and to the induction of CEBPb, a key regulator of the G-CSF gene. As small molecule inhibition of JAK activity disrupted CEBPb induction and reduced G-CSF expression in CRTC2/3m stromal cells, our results demonstrate how cross-coupling between the CREB/CRTC and JAK/STAT pathways contributes to BM homeostasis.

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