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RORa is required for neutrophil migration

ABSTRACT: RORa is required for neutrophil migration

PROVIDER: PRJNA719817 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14144773_1.fastq.gz	Fastqsanger.gz
	SRR14144773_2.fastq.gz	Fastqsanger.gz
	SRR14144774_1.fastq.gz	Fastqsanger.gz
	SRR14144774_2.fastq.gz	Fastqsanger.gz
	SRR14144775_1.fastq.gz	Fastqsanger.gz

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RORa is required for neutrophil migration

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Genetic and pharmacological inhibition of the nuclear receptor RORa regulates Th17 driven inflammatory disorders

Project description:Full development of IL-17 producing CD4+ T helper cells (TH17 cells) requires the transcriptional activity of both orphan nuclear receptors RORa and RORgt. Despite this evidence, RORa is considered functionally redundant to RORgt; thus, the function and therapeutic value of RORa in TH17 cells remains underexplored. Using mouse models of autoimmune and chronic inflammation, we show that expression of RORa is required for TH17 cell pathogenicity. T-cell specific deletion of RORa reduced the development of experimental autoimmune encephalomyelitis (EAE) and colitis. Reduced inflammation was associated with decreased TH17 cell development, lower expression of tissue-homing chemokine receptors and integrins, and increased frequencies of Foxp3+ T regulatory (Treg) cells. Importantly, inhibition of RORa with a selective small molecule antagonist largely phenocopied our genetic data, potently suppressing the in vivo development of both chronic/progressive and relapsing/remitting EAE but had no effect on overall thymic cellularity. Furthermore, use of the RORa antagonist effectively inhibited human TH17 cell differentiation and memory cytokine secretion. Together, these data suggest that RORa acts independently of RORgt in programming TH17 pathogenicity and identifies RORa as a safer and more selective therapeutic target for the treatment of TH17-mediated autoimmunity.

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Project description:Proper differentiation of corneal epithelial cells (CECs) from limbal stem/progenitor cells (LSCs) is required for maintaining ocular homeostasis and clear vision. Here, using a single-cell transcriptomic atlas, we delineate the comprehensive and refined molecular regulatory dynamics during human CEC development and differentiation. We find that RORA is a CEC-specific molecular switch that initiates and drives LSCs to differentiate into mature CECs by activating PITX1. RORA dictates CEC differentiation by establishing CEC-specific enhancers and chromatin interactions between CEC gene promoters and distal regulatory elements. Conversely, RORA silences LSC-specific promoters and disrupts promoter-anchored chromatin loops to turn off LSC genes. Collectively, our work provides detailed and comprehensive insights into the transcriptional dynamics and RORA-mediated epigenetic remodeling underlying human corneal epithelial differentiation.

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