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Analysis of anti-CD3e-induced transcriptional changes in WNK1-deficient thymocytes

ABSTRACT: Analysis of anti-CD3e-induced transcriptional changes in WNK1-deficient thymocytes

PROVIDER: PRJNA561601 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10027100.fastq.gz	Fastqsanger.gz
	SRR10027101.fastq.gz	Fastqsanger.gz
	SRR10027102.fastq.gz	Fastqsanger.gz
	SRR10027103.fastq.gz	Fastqsanger.gz
	SRR10027079.fastq.gz	Fastqsanger.gz

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Analysis of anti-CD3e-induced transcriptional changes in WNK1-deficient thymocytes

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Project description:The appropriate development of myeloid progenitors into macrophages, the body’s professional phagocyte, is essential for organismal development, especially in mammals1. This dependence is exemplified by the observation that loss-of-function mutation in colony stimulating factor 1 receptor (CSF1R) results in multiple tissue abnormalities including osteopetrosis2. Despite this importance, little is known about the molecular and cell biological regulation of macrophage development. Here, we report the surprising finding that the chloride-sensing kinase With-no-lysine 1 (WNK1) is required for embryonic development of tissue-resident macrophages (TRMs). Myeloid-specific deletion of Wnk1 caused a dramatic loss of TRMs and subsequently disrupted organ development, induced systemic neutrophilia, and resulted in mortality between 3 and 4 weeks of age. Specifically, we observed that WNK1 absence stalled macrophage differentiation at the myeloid multipotent progenitor (MPP) stage, instead skewing MPP differentiation towards granulopoiesis. Mechanistically, the cognate CSF1R cytokine, macrophage-colony stimulating factor (M-CSF), triggers macropinocytosis in myeloid progenitors, which in turn induces phosphorylation of WNK1. Importantly, macropinocytosis by myeloid progenitors increases cytosolic chloride, which is directly sensed by WNK1. Perturbing chloride flux during macropinocytosis, inhibiting WNK1 chloride-sensing, and blocking macropinocytosis each skew progenitor differentiation from macrophage lineage to granulocyte lineage. Thus, we have uncovered a novel mechanism that links a cell biological process to a molecular circuit whereby WNK1 chloride-sensing and chloride flux act downstream of M-CSF-induced macropinocytosis by multipotent progenitors to ensure macrophage lineage fidelity.

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