{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMAPK3 (also known as ERK1) is a central effector in the Ras‐dependent mitogen‐activated protein kinase cascade that mediates a broad array of growth‐ and survival–promoting signals. In normal and transformed cells, sustained activation of MAPK3 is required for progression through the cell cycle (for example, driving G1–to–S‐phase transitions by inducing positive regulators and suppressing antiproliferative genes), whereas excessive or prolonged activation can trigger negative feedback and even cell cycle arrest. Moreover, MAPK3 phosphorylates key effectors such as sphingosine kinase 1 and components of the mTOR complex, serving to integrate extracellular cues—from growth factors and hormones (including parathyroid hormone and leptin) to signals from G protein–coupled receptors—into downstream transcriptional and metabolic responses that govern proliferation, metabolic flux, and cell‐fate decisions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its role in regulating cell proliferation and survival, MAPK3 is also a key mediator of the cellular re‐programming that underlies motility, invasion, and metamorphic transitions during cancer progression. Activation of MAPK3 enables cytoskeletal reorganization and promotes epithelial–to–mesenchymal transition by engaging specific docking motifs and downstream transcription factors that upregulate matrix metalloproteinases and other invasion–associated genes. These events also facilitate integrin–dependent adhesion and spreading, thereby contributing to the migratory and invasive traits characteristic of metastatic tumor cells."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its classical roles in cell growth and motility, MAPK3 exerts versatile functions in specialized contexts such as immune modulation, barrier integrity and metabolic regulation. 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