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Fig. 5 | Arthritis Research & Therapy

Fig. 5

From: Endoplasmic reticulum stress cooperates with Toll-like receptor ligation in driving activation of rheumatoid arthritis fibroblast-like synoviocytes

Fig. 5

Synergism between ER stress and LPS in dermal fibroblasts and macrophages. a, c Human dermal fibroblasts (a, n = 3) or GM-CSF-differentiated macrophages (c, n = 3) were stimulated with 1 μg/ml LPS in the presence or absence of 10 nM TG for the indicated amount of time. mRNA expression of mature and primary forms of transcripts of IL6, IL8, and TNF was measured by qPCR. Shown is the ratio between expression observed in both experimental conditions at each time point. b, d Human dermal fibroblasts (b, n = 3) or GM-CSF-differentiated macrophages (d, n = 3) were stimulated with 1 μg/ml LPS in the presence or absence of 10 nM TG for 4 h, followed by incubation with 10 μg/ml ActD to induce transcriptional block. Cells were lysed at the indicated time points after addition of ActD, and the amount of transcript for each gene remaining in cells was analyzed by qPCR. Data are presented as a fraction of transcript detectable at each time point relative to the moment immediately after addition of ActD. ActD Actinomycin D, ER Endoplasmic reticulum, GM-CSF Granulocyte-macrophage colony-stimulating factor, IL Interleukin, LPS Lipopolysaccharide, mRNA Messenger RNA, qPCR Quantitative polymerase chain reaction, TG Thapsigargin, TNF Tumor necrosis factor

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