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- W1983002544 abstract "All-trans-retinoic acid (RA) in olive oil was given in doses of 0, 40, or 60 mg/kg of body weight to pregnant mice on day 8 of gestation, and 2-6 hr later embryos were fixed in solutions with or without cetylpyridinium chloride (CPC). The neuroepithelium of the presumptive midbrain was processed for light and electron microscopy. Distorted contours of the neuroepithelium were induced by both doses of RA and the incidence and the severity of the disorganized neuroepithelium showed dose-related results. Abnormal neuroepithelium showed wide intercellular spaces with degenerated cytoplasmic processes or cell debris, separation of the apical side from adjacent cells, retention of mitotic and/or postmitotic cells on the apical side, presence of mitotic cells on the basal side, and detachment of degenerated structures from the neuroepithelium. Ultrastructurally, the affected neuroepithelium showed (1) appearance of degenerating filamentous or tubular coagulating bundles in the cytoplasm and the cytoplasmic process of the neural crest cells, (2) dispersal of polysomes into monosomes especially in the degenerating neural crest cells, (3) and a collecting of microfilament-like structures at the contact area between the neural crest cell and the presumptive neuroblast. These morphological changes suggest that RA affects the nature of cytoskeletal elements and the protein synthesis of the neuroepithelial cells. The selective susceptibility of neural crest cells to RA causes more degenerating neural crest cells in the neuroepithelium, which causes nonapproximation of the neural folds and scantiness of the migrating neural crest cells; these results lead to neural tube defects and craniofacial anomalies, respectively." @default.
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- W1983002544 date "1987-06-01" @default.
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- W1983002544 title "Developmental anomalies induced by all-trans-retinoic acid in fetal mice: II. Induction of abnormal neuroepithelium" @default.
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- W1983002544 doi "https://doi.org/10.1002/tera.1420350310" @default.
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