{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n LIMCH1, encoding LIM and calponin‐homology domains–containing protein 1, has emerged as a multifunctional regulator implicated in diverse cellular processes and diseases. Functional studies demonstrate that LIMCH1 localizes to contractile actin stress fibers, where it directly interacts with non–muscle myosin IIA to promote myosin regulatory light chain diphosphorylation, stabilize stress fibers and focal adhesions, and thereby restrain cell migration."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In lung cancer models, LIMCH1 has been shown to interact with the E3 ubiquitin ligase HUWE1 to enhance p53 protein stability; its attenuation leads to increased p53 ubiquitination, reduced p53 levels and enhanced cell proliferation, suggesting a tumor‐suppressive role."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n Moreover, noncoding RNA regulation of LIMCH1 is exemplified by circLDB2 acting as a competing endogenous RNA to upregulate LIMCH1, which impedes non–small cell lung cancer progression and increases cisplatin sensitivity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n LIMCH1 is also part of larger interaction networks; for instance, it co‐localizes and co–immunoprecipitates with LRIG proteins – a relationship associated with favorable clinical features in lung cancer."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In addition to its roles in lung cancer, LIMCH1 appears within gene sets linked to aberrant PI3K/AKT signaling in breast tumors"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ">)\n and has been identified as a candidate gene related to cigarette smoking–associated clear cell renal cell carcinoma."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Beyond oncogenesis, genetic variations in LIMCH1 have been associated with body conformation traits in cattle, suggesting roles in developmental processes"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ">). Moreover, in murine studies of endurance exercise training, LIMCH1 is consistently induced in skeletal muscle, which may reflect adaptations in muscle structure and function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n LIMCH1 has also been implicated as part of a core transcription factor network in lung adenocarcinoma"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ">) and, through whole‐exome sequencing studies, as a gene harboring variants that may predispose individuals to substance use disorders."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In placental pathology, LIMCH1 expression contributes to a gene signature that predicts an immunological profile associated with adverse outcomes"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": ">). Finally, LIMCH1 isoforms—initially identified as agmatinase‐like proteins—regulate the metabolism of the neuromodulator agmatine in brain regions such as the hypothalamus and hippocampus, implicating them in neuronal signaling."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Collectively, these studies underscore the pleiotropic functions of LIMCH1 in cytoskeletal regulation, tumor suppression, tissue development, and neuromodulator metabolism, highlighting its potential as both a biomarker and a therapeutic target across a wide range of pathological states.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yu-Hung Lin, Yen-Yi Zhen, Kun-Yi Chien, et al. 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