Interleukin 6

Interleukin 6 (IL-6) is a cytokine that plays an essential role in the immune system. It is a protein that is produced by various cells, including T cells and macrophages, in response to tissue damage or infection. IL-6 is involved in several biological processes, such as inflammation, hematopoiesis, and immune response.

Function

IL-6 is a multifunctional cytokine that regulates immune responses, acute phase reactions, and hematopoiesis, and may play a central role in host defense mechanisms. It is secreted by T cells and macrophages to stimulate immune response, especially during tissue damage and infection.

Structure

The IL-6 protein is a four-helix bundle type cytokine, consisting of four long alpha-helices. The helices are arranged anti-parallel, creating a bundle that is bent in the middle.

Role in Disease

Abnormal levels of IL-6 are associated with various diseases, such as rheumatoid arthritis, systemic lupus erythematosus, and cancer. In these conditions, IL-6 can act as a pro-inflammatory cytokine and promote disease progression.

Clinical Significance

Due to its role in inflammation and immune response, IL-6 is a potential target for therapeutic intervention in diseases characterized by chronic inflammation. Several drugs that target IL-6 or its receptor are currently in use or under development for the treatment of various diseases.

See Also

• Cytokine
• Immune system
• T cells
• Macrophages