RESUMO
Interferon beta (IFNß) is a cytokine that is naturally produced by the immune system in response to biological and chemical stimuli. It signals by binding to the heterodimeric type I IFN receptor composed of the IFNAR1 and IFNAR2 chains, and regulates the expression of a plethora of genes by means of the classical JAK/STAT and other pathways. IFNß is pleiotropic in that it elicits antiviral, antiproliferative, and immunomodulatory activities on numerous cell types. The biological activities underpin the mechanisms by which the protein is used to treat various diseases such as hepatitis C infection and multiple sclerosis. Despite the success of IFNß therapy, the drug may evoke the production of antidrug antibodies that may reduce treatment efficiency. Immunogenicity is related to many factors: among them, structural properties, particularly aggregation, and T-cell and B-cell epitopes in the structure of IFNß, appear to be important. Knowledge of the structural properties of IFNß and its relation to immunogenicity may help scientists to develop safer and more effective forms. Several methods have been used to predict and reduce the immunogenicity of certain IFNß drug products. In this chapter, we review the current knowledge on IFNß from its structure, dynamic conformation, signaling pathway, and mechanism of action to its therapeutic effects. Immunogenicity and its relation to structural properties of IFNß are also discussed.
