Interleukin-6 (IL-6) is an interleukin that acts as both a pro-inflammatory and anti-inflammatory cytokine. IL-6 protein is secreted by a variety of cell types including T cells and macrophages as phosphorylated and variably glycosylated molecule. IL-6 Plays an essential role in the final differentiation of B-cells into Ig-secreting cells involved in lymphocyte and monocyte differentiation. It induces myeloma and plasmacytoma growth and induces nerve cells differentiation Acts on B-cells,T-cells,hepatocytes,hematopoietic progenitor cells and cells of the CNS. IL-6 is also considered a myokine,a cytokine produced from muscle,and is elevated in response to muscle contraction. IL-6 has been shown to interact with interleukin-6 receptor and glycoprotein 130. Additionally,IL-6 is involved in hematopoiesis,bone metabolism,and cancer progression,and has been defined an essential role in directing transition from innate to acquired immunity.