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- W2000473506 abstract "Purpose.: CD40–CD40 ligand (CD40L) interactions appear to play pathogenic roles in autoimmune disease. Here we quantify CD40 expression on fibrocytes, circulating, and bone marrow–derived progenitor cells. The functional consequences of CD40 ligation are determined since these may promote tissue remodeling linked with thyroid-associated ophthalmopathy (TAO). Methods.: CD40 levels on cultivated fibrocytes and orbital fibroblasts (GOFB) from patients with Graves' disease (GD), as well as fibrocyte abundance, were determined by flow cytometry. CD40 mRNA expression was evaluated by real-time PCR, whereas response to CD40 ligation was measured by Luminex and RT-PCR. Protein kinase B (Akt) and nuclear factor (NF)–kappa B (NF-κB) signaling were determined by Western blot and immunofluorescence. Results.: Basal CD40 expression on fibrocytes is greater than that on GOFB. IFN-γ upregulates CD40 in both cell types and its actions are mediated at the pretranslational level. Fibrocytes produce high levels of cytokines, including interleukin-6 (IL-6), TNF-α, IL-8, MCP-1, and RANTES (Regulated on Activation, Normal T Cell Expressed and Secreted) in response to CD40L. IL-6 induction results from an increase in steady state IL-6 mRNA, and is mediated through Akt and NF-κB activation. Circulating CD40+CD45+Col1+ fibrocytes are far more frequent in vivo in donors with TAO compared with healthy subjects. Conclusions.: Particularly high levels of functional CD40 are displayed by fibrocytes. CD40L-provoked signaling results in the production of several cytokines. Among these, IL-6 expression is mediated through Akt and NF-κB pathways. The frequency of circulating CD40+ fibrocytes is markedly increased in patients with TAO, suggesting that this receptor might represent a therapeutic target for TAO." @default.
- W2000473506 created "2016-06-24" @default.
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- W2000473506 date "2012-11-21" @default.
- W2000473506 modified "2023-10-13" @default.
- W2000473506 title "Interleukin-6 Production in CD40-Engaged Fibrocytes in Thyroid-Associated Ophthalmopathy: Involvement of Akt and NF-κB" @default.
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- W2000473506 doi "https://doi.org/10.1167/iovs.12-9861" @default.
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