IL-7 Signaling Pathways and their Primary Biological Effects in Different Immune Cell Types

Interleukin-7 (IL-7) is a type I glycoprotein that is predicted to form a four alpha-helix structure with a hydrophobic core. It is produced primarily by stromal cells and exerts its effects through a receptor complex consisting of IL-7 R alpha and common gamma-chain/IL-2 R gamma. IL-7 signaling is essential for the establishment and maintenance of normal immune system functions. It is required for mouse and human T cell development and homeostatic proliferation, mouse B cell development, and the generation of CD4⁺ and CD8⁺ memory T cells. IL-7 R alpha-deficient mice have reduced numbers of thymocytes, impaired T cell and B cell development, and lack gamma delta T cells, a small subset of T cells found in epithelium-rich tissues. The requirement of IL-7 for T cell survival has been partially attributed to its ability to induce expression of the anti-apoptotic Bcl-2, Bcl-xL, and Mcl-1 proteins. In addition, IL-7 plays a role in regulating V(D)J recombination at the TCR gamma, TCR beta, and immunoglobulin heavy chain loci.

To learn more, please visit our Common gamma Chain Receptor Family Research Area.