IL-21 Mediates Suppressive Effects via Its Induction of IL-10

IL-21 mediates suppressive effects via its induction of IL-10.

IL-21 is a pleiotropic cytokine that is required for normal Ig production. We previously showed that IL-21 was elevated in BXSB-Yaa mice with systemic lupus erythematosus. These mice also had elevated IL-10 levels, and we now show that IL-21 induces IL-10 mRNA and protein, suggesting unexpected immunosuppressive activities for IL-21. Indeed, Th1 priming with IL-21 leads to accumulation of cells...

Molecular mechanisms of the induction of IL-12 and its inhibition by IL-10.

Exogenously added IL-10 rapidly inhibited Staphylococcus aureus- or LPS-induced cytokine mRNA expression in human PBMCs and monocytes, with a maximal effect observed when IL-10 was added from 20 h before until 1 h after the addition of the inducers. Nuclear run-on assays revealed that the inhibition of IL-12 p40, IL-12 p35, and TNF-alpha was at the gene transcriptional level and that the additi...

IL-1β mediates leptin induction during inflammation.

Interleukins (IL) are key mediators of the host response to infection and inflammation. Leptin is secreted by adipose tissue and plays an important role in the control of food intake. Administration of lipopolysaccharide (LPS), tumor necrosis factor (TNF), or IL-1 acutely increases leptin mRNA and protein levels. To investigate the role of IL-1β and IL-6 in leptin expression during inflammation...

Differential Effects of IL-21 during Initiation

IL-21/IL-21R in Autoimmune Diseases

Interleukin-21 (IL-21), the member of the γ-chain-related cytokine family, and its receptor (IL-21R), has been evidenced involving in the immune response, resulting in the development of autoimmune diseases, infectious diseases and tumors. This short communication reviews an overall outline of its genetic variants and expression in autoimmune diseases. It focuses on a series of recent studies t...