Regulation of activation-induced receptor activator of NF-kappaB ligand (RANKL) expression in T cells

European Journal of Immunology
Ruoxiang WangYufang Shi

Abstract

Receptor activator of NF-kappaB ligand (RANKL) is a type II membrane protein of the TNF family and plays a critical role in the regulation of osteoclastogenesis. RANKL expressed on osteoblastic stromal cells has been shown to support osteoclast differentiation originated from hematopoietic precursors. Interestingly, RANKL is also expressed on cells of the immune system including T cells and dendritic cells. We have shown that anti-CD3 could induce RANKL expression in T cell hybridoma A1.1 cells and splenic T cells. RANKL expressed on T cells could effectively induce osteoclast formation from the whole population of murine splenocytes. Furthermore, we have found that the induction of RANKL expression is solely dependent on TCR activation-induced Ca2+ mobilization since its expression can be blocked by cyclosporine A and TMB-8, a Ca2+ mobilization inhibitor. Additionally, treatment of A1.1 cells with ionomycin alone also strongly induces RANKL expression, while phorbol myristate acetate by itself does not. Moreover, although inhibition of c-myc has significant effects on anti-CD3-induced Fas ligand (FasL) expression, we have found that the anti-CD3-induced RANKL expression is independent of c-myc. Surprisingly, in contrast to its...Continue Reading

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