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Molecular reframing of fibroblasts during resolution of arthritis

ABSTRACT: Molecular reframing of fibroblasts during resolution of arthritis

PROVIDER: PRJNA952269 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR24067200_1.fastq.gz	Fastqsanger.gz
	SRR24067200_2.fastq.gz	Fastqsanger.gz
	SRR24067514_1.fastq.gz	Fastqsanger.gz
	SRR24067514_2.fastq.gz	Fastqsanger.gz
	SRR24067515_1.fastq.gz	Fastqsanger.gz

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Project description:Fibroblasts are key orchestrators of inflammation. Little is known whether these cells change phenotype during resolution of inflammation. We adopted a method to visualise fibroblast activation during inflammation in humans in vivo, which is based on a fibroblast activation protein (FAP) tracer detected by positron emission tomography (PET). While tracer accumulation was high in active arthritis, it decreased significantly after TNF- and IL-17A inhibition. Biopsy-based scRNA-seq analyses in experimental arthritis demonstrated that FAP signal reduction reflected a phenotypic switch from pro-inflammatory MMP3+/IL6+ fibroblasts (high FAP internalisation) to pro-resolving CD200+DKK3+ fibroblasts (low FAP internalisation). Spatial transcriptomics of human joints revealed that pro-resolving niches of CD200+DKK3+ fibroblasts clustered with innate lymphoid cells (ILC)2, whereas MMP3+/IL6+ fibroblasts were co-localised with inflammatory immune cells. CD200+DKK3+ fibroblasts stabilised the ILC2 phenotype and induced resolution of arthritis via CD200/CD200R1 pathway. Taken together, these data suggest a dynamic molecular regulation of the mesenchymal compartment during resolution of inflammation.

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Project description:This SuperSeries is composed of the SubSeries listed below.

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Sequencing of synovial tissue fibroblasts from Rheumatoid Arthritis patients that were co-cultured with inflammatory macrophages.

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