{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n DUSP16, also known as MKP‐7, is a dual‐specificity phosphatase that deactivates stress‐activated MAP kinases—primarily JNK and, to a lesser extent, p38 MAPK. It has been identified as a direct target of the transcriptional repressor Blimp‐1 during epidermal cornification, suggesting that its expression is critical for proper suppression of osmotic regulation in granular cells and for timely barrier formation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In the context of cancer, chemotherapy in triple‐negative breast cancer induces a HIF1‐dependent decrease in DUSP16 expression, leading to a switch from ERK to p38 signaling that promotes the expression and stabilization of pluripotency factors, thereby contributing to the enrichment of breast cancer stem cells and chemoresistance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Moreover, during oxidative stress, the late‐phase induction of DUSP16—as part of a coordinated response with other DUSPs—plays an essential role in dephosphorylating JNK and tempering its activation, thereby ensuring appropriate signal attenuation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Structural studies further illuminate the mechanism by which DUSP16 binds to and dephosphorylates JNK; these analyses have revealed specific docking interactions that are critical for its function in down‐regulating JNK activity, which has important implications for tumor suppression and the regulation of cell transformation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " In Burkitt’s lymphoma, epigenetic silencing of DUSP16 via methylation of its 5′ CpG island correlates with enhanced JNK activation and increased cellular sensitivity to pro‐apoptotic stimuli."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " In addition, activation of PPARδ in dermal fibroblasts stabilizes MKP‐7 (DUSP16) mRNA, leading to diminished JNK signaling, reduced secretion of matrix metalloproteinase‐1, and consequent protection against UVB‐induced photoaging."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Finally, differential DUSP16 expression has emerged as a potential molecular marker predictive of response to mTOR inhibitors in ER‐positive breast cancer, underscoring its broader importance in modulating MAPK‐driven cell proliferation and survival."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Erna Magnúsdóttir, Sergey Kalachikov, Koji Mizukoshi, et al. 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