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Disease activity drives transcriptomic heterogeneity in early untreated rheumatoid synovitis

ABSTRACT: Disease activity drives transcriptomic heterogeneity in early untreated rheumatoid synovitis

PROVIDER: PRJNA937236 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23573600_1.fastq.gz	Fastqsanger.gz
	SRR23573600_2.fastq.gz	Fastqsanger.gz
	SRR23573601_1.fastq.gz	Fastqsanger.gz
	SRR23573601_2.fastq.gz	Fastqsanger.gz
	SRR23573602_1.fastq.gz	Fastqsanger.gz

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Disease activity drives transcriptomic heterogeneity in early untreated rheumatoid synovitis

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Project description:Macrophage polarization and synovitis play significant roles in rheumatoid arthritis (RA). Chemokines are involved almost throughout the entire pathology of synovitis. However, the interaction between chemokines and macrophage polarization in RA has been seldom reported. This study found that chemokine C-C motif ligand 7 (CCL7) secreted by polarized M1 macrophages enhances M1 polarization, creating a positive feedback loop and revealing the role of CCL7 in the progression of rheumatoid arthritis. In this research, RNA sequencing indicated that M1 polarized macrophages secrete a large amount of CCL7, which further enhances M1 polarization. Through immunohistochemistry and enzyme-linked immunosorbent assay, it was found that the expression of CCL7 in the synovial tissue and serum of RA patients and mice was upregulated. Intra-articular injection of CCL7 recombinant protein exacerbated M1 polarization of macrophages, inflammation, fibrosis in the synovial tissue, and worsened arthritis pain in mice, which was improved after the injection of CCL7 neutralizing antibody. In addition, CCL7 promoted M1 polarization of macrophages and reversed the M2 polarization induced by IL-4, and it also promoted macrophage proliferation and migration. Although it had an inhibitory effect on chondrocyte activity, it did not show a significant impact on chondrocyte metabolism. Mechanistically, CCL7 targets CCR1 to promote M1 polarization of macrophages, a process partly mediated through the activation of the JAK2/STAT1 pathway. When stimulated by CCL7, macrophages secreted a vast amount of pro-inflammatory factors, exacerbating synovitis and cartilage damage, leading to the aggravation of RA disease. Our research established a positive feedback loop between M1 polarization of macrophages and CCL7, indicating that blocking CCL7 could improve the progression of RA, suggesting CCL7 as a potential target for RA treatment.

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