JNK (c-Jun N-terminal kinase), also called stress activated protein kinase (SAPK), is a member of the serine/threonine MAP kinase family. MAP kinase signaling cascades are critically important in translating the signals received at the plasma membrane into changes in cellular physiology and gene expression. JNK is activated in response to a variety of stimuli, including inflammatory cytokines, growth factors and cellular stresses such as UV-light. Because of JNK’s role in basic cellular processes such as inflammation and apoptosis, an understanding of the JNK signaling cascade should speed the development of therapeutics.

