Description
IL-17 is a potent regulator of the neutrophil response. Both IL-17A and IL-17F are capable of signaling through IL-17RA to induce granulopoietic factors such as G-CSF and stem cell factor which leads to expansion of neutrophil progenitors in the bone marrow and spleen, as well as expansion of mature neutrophils in peripheral blood. IL-17RA signaling up- regulates production of neutrophilic chemokines such as CXCL1 (KC), CXCL2, CXCL5, CXCL6, and CXCL8, which in turn regulate neutrophil emigration to mucosal sites. Due to this role in neutrophil expansion and recruitment, IL-17RA signaling is an important part of the host response to extracellular bacterial infections.To date, four additional receptors have been identified in the IL- 17R family based on sequence homology to IL-17R (IL- 17Rh1, IL-17RC, IL-17RD, and IL-17RE) and among them, IL- 17RC has been shown recently to physically associate with IL-17RA, suggesting that it may be a functional component in the IL-17R complex. Nevertheless, the final structure of the functional IL-17 receptor and the mechanisms of interactions with IL-17A remain unknown