{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe alpha‐arrestin protein family, which includes TXNIP and ARRDC4, plays a critical role in regulating nutrient transporter trafficking and cellular metabolism. TXNIP and ARRDC4 both inhibit glucose uptake in adipocytes and fibroblasts through intrinsic arrestin domains that function independently of thioredoxin binding. These findings underscore the idea that structural features inherent to the arrestin fold are pivotal for modulating cellular glucose handling and overall metabolic activity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its role in basic metabolic regulation, ARRDC4 has been implicated in pathological conditions. In colorectal cancer, ARRDC4 is a direct downstream target of METTL14‐mediated m6A modification; decreased METTL14 expression enhances ARRDC4 mRNA stability and activates downstream pathways, including ZEB1 signaling, thereby influencing metastatic progression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond tumor biology, ARRDC4 is also essential in reproductive physiology. Its role in extracellular vesicle biogenesis is critical for proper sperm maturation within the epididymis. Deficiency in ARRDC4 leads to reduced production of extracellular vesicles by epididymal epithelial cells, which in turn results in impaired sperm motility, premature acrosome reaction, and decreased fertilization capability."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt an organismal level, ARRDC4 functions as a key regulator of systemic glucose homeostasis. Mice lacking ARRDC4 exhibit impaired glucagon responses and a defective ability to modulate gluconeogenesis, resulting in lowered fasting glucose and an inability to properly process changes during the fed state. Moreover, alterations in ARRDC4 expression have been associated with insulin resistance and type 2 diabetes, with evidence linking it to immune cell infiltration and interactions with key metabolic regulators such as GLUT1 in cardiac tissue."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Parth Patwari, William A Chutkow, Kiersten Cummings, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "TCF4 and HuR mediated-METTL14 suppresses dissemination of colorectal cancer via N6-methyladenosine-dependent silencing of ARRDC4."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Death Dis (2021)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/s41419-021-04459-0"}], "href": "https://doi.org/10.1038/s41419-021-04459-0"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "34916487"}], "href": "https://pubmed.ncbi.nlm.nih.gov/34916487"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Natalie J Foot, Macarena B Gonzalez, Kelly Gembus, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "An insulin-regulated arrestin domain protein controls hepatic glucagon action."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2023)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.jbc.2023.105045"}], "href": "https://doi.org/10.1016/j.jbc.2023.105045"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "37451484"}], "href": "https://pubmed.ncbi.nlm.nih.gov/37451484"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Jing Liu, Lingzhen Meng, Zhihong Liu, et al. 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