Extracellular signal-regulated kinase 1/2 (ERK1/2)

Extracellular signal-regulated kinase 1/2 (ERK1/2) refers to two closely related serine/threonine protein kinases (ERK1 and ERK2) that function as the central effectors of the MAPK/ERK signaling pathway, a conserved signaling cascade present in all eukaryotic cells[1][4]. Activated downstream of various stimuli—including growth factors, cytokines, and cellular stress—ERK1/2 transmit signals from surface receptors through a cascade involving Ras, Raf, and MEK, culminating in the phosphorylation of ERK1/2 and their translocation to the nucleus[1][3][4]. There, they regulate the activity of key transcription factors and other substrates to control cell proliferation, differentiation, survival, apoptosis, immune function, and other vital processes[1][2][3][4]. Dysregulated ERK1/2 signaling is implicated in a wide range of diseases, including many cancers, inflammatory and neurodegenerative disorders, and ischemia-reperfusion injury[1][3][4]. ERK1/2, as kinases rather than receptors or transporters, are validated molecular targets for drug development; numerous small-molecule inhibitors have reached advanced preclinical and clinical development[4]. **Note:** "ERK1/2 signaling" is not itself a molecule or protein but describes the signaling activity or pathway mediated by the ERK1 and ERK2 kinases. For most structured data requirements, the relevant canonical targets are the two kinase proteins: Extracellular signal-regulated kinase 1 (MAPK3/ERK1) and Extracellular signal-regulated kinase 2 (MAPK1/ERK2)[4][1]. If structured data requires unique identifiers (such as gene names or Uniprot accessions), these should be separated per protein. "ERK1/2 signaling" is an incorrect name for a target molecule, though it correctly designates the signaling function as a pathway.

Other names

ERK1ERK2MAPK3MAPK1ERKMitogen-activated protein kinase 1 and 2MAP kinase ERK1/2ERK pathway

- Inhibition of ERK1/2 kinase activity - Blockade of phosphorylation events in the ERK1/2 pathway - Inhibition of cell proliferation and induction of cell cycle arrest or apoptosis in abnormal cells[4]