{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Epiregulin (EREG) is a multifunctional epidermal growth factor receptor (EGFR) ligand that plays diverse roles in both physiology and disease. In the liver, for example, EREG expression is up‐regulated in response to intestinal microbiota and Toll‐like receptor 4 signaling, thereby promoting hepatocellular carcinoma progression by enhancing cell proliferation and suppressing apoptosis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Its bioavailability is controlled by ectodomain shedding, with ADAM17 emerging as the key convertase responsible for processing epiregulin."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In reproductive biology, epiregulin is transiently induced by the luteinizing hormone surge and functions as a paracrine mediator in the ovarian follicle. It collaborates with other EGF‐like factors to propagate signals that promote cumulus expansion, oocyte maturation, and ovulation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "7"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In the context of cancer, epiregulin has been implicated as a critical mediator of tumor progression and metastasis. In breast cancer, its expression—often in concert with other factors such as COX2 and matrix metalloproteinases—facilitates neovascularization, promotes tumor cell dissemination, and enhances the metastatic cascade."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "10"}]}, {"type": "t", "text": " In colorectal cancer, high levels of epiregulin expression are associated with improved response and survival in patients treated with EGFR-targeted therapy."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " Furthermore, studies of EGFR trafficking demonstrate that epiregulin elicits receptor recycling rather than degradation, supporting sustained yet qualitatively distinct (partial agonist) signaling that may bias responses toward differentiation over proliferation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Epiregulin is also integrated within inflammatory and regenerative pathways. It has been identified as one of the NF-κB/IKK-dependent genes linking inflammatory signals to cellular growth responses"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": ", while in the intestinal epithelium, epiregulin functions as a key component of a regeneration program activated by Yap signaling that promotes recovery after injury."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": " In colon cancer stem cells, epiregulin is expressed and contributes to tumor initiation and metastasis, with antibody-mediated targeting of epiregulin showing promising antitumor efficacy."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, in pancreatic cancer, epiregulin expression is modulated downstream of aberrant mucin signaling, further implicating it in tumor aggressiveness"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": ", and its differential expression in breast cancers correlates with distinct receptor co-expression patterns and clinical characteristics."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Collectively, these findings highlight the pleiotropic functions of epiregulin across multiple biological systems. 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