MEK (Mitogen-Activated Protein Kinase Kinase)

MEK, or Mitogen-Activated Protein Kinase Kinase, is an enzyme that plays a key role in a cellular signaling pathway involved in cell growth, division, and survival. It acts as a relay point, transmitting signals from the surface of the cell to the nucleus, where genes are activated or repressed. MEK specifically activates another protein called ERK, which then influences various functions like cell proliferation and differentiation. Proper regulation of MEK is crucial; when its activity is abnormal, it can contribute to diseases such as cancer.