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JAK-STAT signaling maintains homeostasis in T cells and macrophages

ABSTRACT: JAK-STAT signaling maintains homeostasis in T cells and macrophages

PROVIDER: PRJNA842031 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR19387100.fastq.gz	Fastqsanger.gz
	SRR19387200.fastq.gz	Fastqsanger.gz
	SRR19387300.fastq.gz	Fastqsanger.gz
	SRR19387400.fastq.gz	Fastqsanger.gz
	SRR19387500.fastq.gz	Fastqsanger.gz

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JAK-STAT signaling maintains homeostasis in T cells and macrophages (spatial transcriptomics)

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Project description:Immune cells need to sustain a state of constant alertness over a lifetime. Yet, little is known about the regulatory processes that control the fluent and fragile balance that is called homeostasis. Here we demonstrate that JAK-STAT signaling, beyond its role in immune responses, is a major regulator of immune cell homeostasis. We investigated JAK-STAT-mediated transcription and chromatin accessibility across 12 mouse models, including knockouts of all STAT transcription factors and of the TYK2 kinase. Baseline JAK-STAT signaling was detected in CD8+ T cells and macrophages of unperturbed mice – but abrogated in the knockouts and in unstimulated immune cells deprived of their normal tissue context. We observed diverse transcription-regulatory programs, including gene regulation by STAT2 and IRF9 independent of STAT1. In summary, our large-scale dataset and integrative analysis of JAK-STAT mutant and wildtype mice uncovered a crucial role of JAK-STAT signaling in unstimulated immune cells, where it contributes to a poised epigenetic and transcription-regulatory state and helps prepare these cells for rapid response to immune stimuli.

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Project description:Tumor-associated macrophages contribute to tumor progression and therapeutic resistance in breast cancer. Within the tumor microenvironment, tumor-derived factors activate pathways that modulate macrophage function. Using in vitro and in vivo models, we find that tumor-derived factors induce activation of the Janus kinase (JAK)/signal transducer and activator of transcription 3 (STAT3) pathway in macrophages. We also demonstrate that loss of STAT3 in myeloid cells leads to enhanced mammary tumorigenesis. Further studies show that macrophages contribute to resistance of mammary tumors to the JAK/STAT inhibitor ruxolitinib in vivo and that ruxolitinib-treated macrophages produce soluble factors that promote resistance of tumor cells to JAK inhibition in vitro. Finally, we demonstrate that STAT3 deletion and JAK/STAT inhibition in macrophages increases expression of the pro-tumorigenic factor cyclooxygenase-2 (COX-2) and that COX-2 inhibition enhances responsiveness of tumors to ruxolitinib. These findings define a novel mechanism through which macrophages promote therapeutic resistance and highlight the importance of understanding the impact of targeted therapies on the tumor microenvironment.

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