Increased cytokine expression and concurrent psychiatric symptoms were initially observed after administration of cytokines to patients afflicted with cancer, hepatitis and multiple sclerosis. Cytokines are a diverse group of soluble messenger proteins involved in the regulation, repair of cells, and control of immune events. During an inflammatory event expression of CD4+ T-lymphocyte helper (...

The story of cytokines goes back to last century when interferon was discovered first time. Cytokines are pleiotropic proteins or small glycoproteins with a molecular weight less than 30 kDa (˂200 amino acids) Cytokines are produced by a number of cell types, such as leukocytes which regulate immunity, inflammation and hematopoiesis [1]. About 200 cytokines are recognized to date. They have a h...