Abstract

The GILZ (glucocorticoid-induced leucine zipper) protein has first been identified as a glucocorticoid-responsive gene and is now presented as a major regulator of inflammation. Expanding literature documents a role for GILZ as a mediator of the immuno-modulatory and anti-inflammatory effects of glucocorticoids, mainly through interference with key signal transduction pathways such as nuclear factor-kappa B (NF-kB) or activated protein-1 (AP-1). The TSC-22 (TGF-β-stimulated clone-22) protein is described as an apoptosis modulator and as a new tumor suppressor gene. GILZ and TSC-22, characterized by the presence of a leucine zipper domain and a TSC-box, belong to the TSC-22D (TSC-22 domain) family of proteins which comprises today 18 members. Functions of these proteins suggest that this family plays a major role in cell homeostasis and in the regulation of the immune system.

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