{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNOSTRIN was originally identified as a novel endothelial nitric oxide synthase (eNOS)–interacting protein that plays a key role in regulating eNOS localization and activity. It contains an N‐terminal F‐BAR (Cdc15) domain and a C‐terminal SH3 domain that mediates binding to eNOS. Overexpression of NOSTRIN promotes the translocation of eNOS from the plasma membrane into intracellular vesicle‐like structures, resulting in significant inhibition of nitric oxide (NO) release. This function positions NOSTRIN as an important component in the protein network that controls eNOS trafficking and targeting, ultimately modulating vascular NO signaling."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMechanistically, NOSTRIN has been shown to interact with several key regulatory proteins. It binds directly to caveolin‐1 via its central domain, allowing the formation of a ternary complex with eNOS that likely facilitates caveolar trafficking. Furthermore, by using its SH3 domain, NOSTRIN also associates with dynamin and the actin nucleation–promoting factor N‐WASP. These interactions help recruit components essential for endocytosis, promoting the internalization of eNOS in a manner that depends on the integrity of actin filaments and membrane cholesterol levels."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn pathological contexts, increased NOSTRIN expression has been linked to impaired eNOS function. Studies in endothelial cells and placental vessels have shown that higher NOSTRIN levels correlate with reduced eNOS activity and decreased NO production, as observed in conditions such as preeclampsia and intrauterine growth restriction. Similarly, overexpression of NOSTRIN in cultured human endothelial cells causes not only diminished eNOS function but also notable cellular morphological changes and injury. Moreover, altered NOSTRIN expression in testicular tissues has been investigated for its potential role in the pathogenesis of azoospermia."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "7"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its cytoplasmic functions, a truncated variant of NOSTRIN—termed NOSTRINβ—has been detected, which lacks a major portion of the F‐BAR domain and predominantly localizes to the nucleus. This nuclear variant contains functional nuclear localization and export signals and is capable of directly binding to its gene’s promoter region to negatively regulate NOSTRIN transcription, suggesting an auto-regulatory feedback mechanism. In the cancer field, NOSTRIN has been reported as anti‐angiogenic, anti‐invasive, and anti‐inflammatory. Its expression in colorectal tissues and its inverse correlation with survival in pancreatic ductal adenocarcinoma patients further implicate NOSTRIN in modulating tumor aggressiveness."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ""}]}]}]}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Kirstin Zimmermann, Nils Opitz, Jurgen Dedio, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "NOSTRIN functions as a homotrimeric adaptor protein facilitating internalization of eNOS."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Cell Sci (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1242/jcs.02620"}], "href": "https://doi.org/10.1242/jcs.02620"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16234328"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16234328"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Kirstin Schilling, Nils Opitz, Anja Wiesenthal, et al. 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