{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMAPK13—also known as the p38δ isoform of mitogen‐activated protein kinase—is emerging as a multifunctional signal transducer in diverse cellular contexts. In epithelial and inflammatory settings, MAPK13 operates downstream of factors such as CLCA1 to mediate IL‑13–induced mucus production in airway epithelial cells, a mechanism linked to diseases like COPD. In parallel, in keratinocytes MAPK13 regulates differentiation by modulating ERK1/2 activity, promoting the expression of differentiation markers such as involucrin, and participating in apoptotic responses and inflammasome assembly; it also influences the organization of intercellular junctions that control cell adhesion and invasive behavior."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn cancer and senescence paradigms MAPK13 displays context‐dependent functions. It acts as a tau kinase phosphorylating multiple Alzheimer disease–related epitopes and, in melanoma, its promoter is frequently hypermethylated such that re‐expression can constrain proliferation—suggesting a tumor suppressive role. Conversely, elevated MAPK13 expression in breast and cholangiocarcinomas as well as colorectal cancer supports pro-survival signaling, metastatic behavior, and the maintenance of cancer stem-like cell populations. In addition, MAPK13 contributes to oncogene-induced senescence through DNA damage–linked mechanisms and modulates apoptosis in bystander T cells during HIV-1 infection."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMAPK13 also plays critical roles in cellular stress responses, metabolic regulation, and differentiation processes. High-resolution structural studies of MAPK13 have enabled the rational design of specific inhibitors that may have therapeutic utility. 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