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Acod1-mediated effect on osteoclast differentiation

ABSTRACT: Acod1-mediated effect on osteoclast differentiation

PROVIDER: PRJNA995539 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25316791_1.fastq.gz	Fastqsanger.gz
	SRR25316791_2.fastq.gz	Fastqsanger.gz
	SRR25316792_1.fastq.gz	Fastqsanger.gz
	SRR25316792_2.fastq.gz	Fastqsanger.gz
	SRR25316793_1.fastq.gz	Fastqsanger.gz

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Acod1-mediated effect on osteoclast differentiation

Project description:Enhanced osteoclast-mediated bone erosion is a prominent hallmark of rheumatoid arthritis. Emerging evidence suggests that this process is facilitated by metabolic dysregulation of osteoclasts. The mitochondrial enzyme aconitate decarboxylase 1 (Acod1, also known as immune responsive gene 1 [Irg1]) serves as a mediator between the metabolic condition and the functional state of different types of cells. Acod1-deficient mice are characterized by enhanced osteoclast differentiation and bone erosion in an inflammatory arthritis model, while therapeutic treatment with the itaconate-derivative 4-octyl-itaconate (4-OI) alleviates the disease phenotype in experimental arthritis. To ascertain the influence of the Acod1-itaconate axis on the genomic transcriptional network of osteoclasts, we performed a whole transcriptome RNA sequencing analysis with fully differentiated osteoclasts from WT and Acod1-deficient mice that were cultured in the presence or absence of 4-OI.

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PRDX1-TLR4-p65 axis inhibits RANKL-mediated osteoclast differentiation

Project description:Peroxiredoxin 1 (PRDX1), traditionally known as an intracellular antioxidant enzyme, has emerged as a regulator of inflammatory responses via Toll-like receptor 4 (TLR4) signaling. Despite this, the mechanistic details of the PRDX1-TLR4 axis and its impact on osteoclast differentiation remain elusive. Here, we show that PRDX1 suppresses RANKL-induced osteoclast differentiation. Utilizing pharmacological inhibitors, we reveal that PRDX1 inhibits osteoclastogenesis through both TLR4/TRIF and TLR4/MyD88 pathways. Transcriptome analysis revealed PRDX1-mediated alterations in gene expression, particularly upregulating serum amyloid A3 (SAA3) and aconitate decarboxylase 1 (ACOD1), known inhibitors of osteoclast differentiation. Mechanistically, PRDX1-TLR4 signaling activates p65, promoting SAA3 and ACOD1 expression while inhibiting NFATc1, a master regulator of osteoclastogenesis. Remarkably, PRDX1 redirects p65 binding from NFATc1 to SAA3/ACOD1 promoters, thereby suppressing osteoclast formation. Structural analysis showed that monomeric variants of PRDX1 with enhanced TLR4 binding exhibit potent inhibition of osteoclast differentiation. Our findings elucidate the inhibitory role of PRDX1-TLR4 axis in osteoclastogenesis, providing insights into therapeutic strategies for bone-related disorders.

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PRDX1-TLR4-p65 axis inhibits RANKL-mediated osteoclast differentiation

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