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RHEUMATOID ARTHRITIS SYNOVIAL MICROENVIRONMENT INDUCES METABOLIC AND FUNCTIONAL ADAPTATIONS IN DENDRITIC CELLS

ABSTRACT: Rheumatoid Arthritis (RA) is a chronic autoimmune disease which causes degradation of cartilage and bone. It is well appreciated that the pathogenic hallmark of RA is the mass influx of inflammatory cells into the joint. However, the role dendritic cells (DC) may play in this inflammatory milieu is still relatively unexplored. Moreover, the contribution this unique synovial microenvironment has on DC function and maturation is still unknown. Using monocyte-derived DC (MoDC), we established an in vitro model to recapitulate the synovial microenvironment to explore DC maturation. MoDC treated with conditioned media from ex vivo synovial tissue biopsy cultures (ECM) have increased expression of proinflammatory cytokines, chemokines and adhesion molecules. ECM treated DC have increased expression of CD83 and CCR7 and decreased expression of CCR5 and phagocytic capacity, suggestive of heightened DC maturation. ECM induced maturation is concomitant with altered cellular bioenergetics, whereby increased expression of glycolytic genes and increased glucose uptake are observed in ECM treated DC. Collectively, this results in a metabolic shift in DC metabolism in favor of glycolysis. These adaptations are in-part mediated via STAT3 as demonstrated by decreased expression of proinflammatory cytokines and glycolytic genes in ECM treated DC in response to STAT3 inhibition. Finally, to translate this data to a more in vivo clinically relevant setting, we interrogated a previously published synovial DC dataset and identified enhanced expression of glycolytic genes in synovial DC compared to DC in circulation. Collectively, our data suggests that the synovial microenvironment in RA contributes to DC maturation and metabolic reprogramming.

ORGANISM(S): Homo sapiens

PROVIDER: GSE151897 | GEO | 2020/11/05

REPOSITORIES: GEO

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Project description:Human monocyte derived dendritic cells matured via galectin-1 or LPS. Experiment Overall Design: 4 conditions with 3 replicates of each include control or intreated immature MDDCS, galectin-1 treated MDDCs, LPS treated MDDCs, and vehicle control MDDCs. (each replicate is from a distinct DONOR). Dendritic cells (DCs) are potent mediators of the immune response, and can be activated by exogenous pathogen components. Galectin-1 is a member of the conserved beta-galactoside-binding lectin family that binds galactoside residues on cell surface glycoconjugates. Galectin-1 is known to play a role in immune regulation via action on multiple immune cells. However, its effects on human DCs are unknown. In this study, we show that galectin-1 induces a phenotypic and functional maturation in human monocyte-derived DCs (MDDCs) similar to but distinct from the activity of the exogenous pathogen stimuli, LPS. Immature human MDDCs exposed to galectin-1 up-regulated cell surface markers characteristic of DC maturation (CD40, CD83, CD86, and HLA-DR), secreted high levels of IL-6 and TNF-alpha, stimulated T cell proliferation, and showed reduced endocytic capacity, similar to LPS-matured MDDCs. However, unlike LPS-matured DCs, galectin-1-treated MDDCs did not produce the Th1-polarizing cytokine IL-12. Microarray analysis revealed that in addition to modulating many of the same DC maturation genes as LPS, galectin-1 also uniquely up-regulated a significant subset of genes related to cell migration through the extracellular matrix (ECM). Indeed, compared with LPS, galectin-1-treated human MDDCs exhibited significantly better chemotactic migration through Matrigel, an in vitro ECM model. Our findings show that galectin-1 is a novel endogenous activator of human MDDCs that up-regulates a significant subset of genes distinct from those regulated by a model exogenous stimulus (LPS). One unique effect of galectin-1 is to increase DC migration through the ECM, suggesting that galectin-1 may be an important component in initiating an immune response.

Dataset Information

RHEUMATOID ARTHRITIS SYNOVIAL MICROENVIRONMENT INDUCES METABOLIC AND FUNCTIONAL ADAPTATIONS IN DENDRITIC CELLS

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