Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5534262 | Molecular and Cellular Endocrinology | 2017 | 11 Pages |
â¢TNF-α, IFN-γ, and BAFF were upregulated in the retrobulbar tissues of GO patients.â¢Cultured orbital fibroblasts produced BAFF following cytokine stimulation.â¢Cultured GO-OFs overexpressed BAFF mRNA, and released much more soluble BAFF.â¢Cultured OFs weakly expressed APRIL, and slightly responded to cytokines.â¢GO-OFs promoted B cell survival by mechanisms involving BAFF.
The success of rituximab for the treatment of active Graves' orbitopathy (GO) suggests that B cells play a critical role in intraorbital inflammation. B cell activating factor (BAFF) and its homolog a proliferation-inducing ligand (APRIL) are critical for B cell survival. However, the contribution of BAFF/APRIL to GO remains unclear. We sought to determine the role of BAFF/APRIL in the orbits of GO, and found that BAFF was markedly upregulated, while APRIL was not. Additionally, cultured GO orbital fibroblasts (GO-OFs)2 expressing BAFF were induced to produce a large amount of BAFF. In contrast, a weak APRIL expression was detected in the OFs, and they exhibited a slight response to stimulation. Notably, pretreated GO-OFs promoted B cell survival, and this effect was significantly inhibited by a BAFF-R neutralizing antibody. This study indicates that OFs from GO can express BAFF and mediate the intraorbital survival of B cells via BAFF mechanism.