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• W2162482167 abstract "Ten ponies (160-250 kg, ages 17 months to 20 years) developed severe diarrhea within 24 hours of castor oil administration (2.5 ml/kg orally). The diarrhea was most severe between 24 and 48 hours post-dosing and subsided by 72 hours. Ponies were euthanatized at 24, 48, and 72 hours post-dosing and intestine was evaluated histologically and ultrastructurally. Twenty-four hours after dosing, the mucosa of the cecum and ventral colon had extensive superficial epithelial erosion and neutrophil infiltration. In the ileum, the epithelium of villous tips was separated from the lamina propria. Scanning electron microscopic examination of the cecal mucosa revealed that basement membranes were exposed in most areas except within necks of crypts. Ultrastructurally, changes in superficial enterocytes of the cecum and ventral colon were characterized by loss of microvilli, distortion of the cytoplasmic terminal web, expansion of the cytoplasmic matrix with formation of precipitates, and widening of intercellular spaces between junctional complexes. Enterocytes located within necks of crypts were flattened along the basement membrane and extended to margins of erosions. Venules within the superficial lamina propria were occluded by fibrin thrombi. Erosions in the cecum and ventral colon of ponies examined 48 hours after treatment were less extensive than those of ponies examined at 24 hours. At 48 hours post-dosing, basement membranes adjacent to crypts were covered by cuboidal enterocytes characterized ultrastructurally by sparse, irregularly shaped microvilli located on broad cytoplasmic protrusions and by numerous free ribosomes. These features indicated that immature enterocytes had migrated from crypts to resurface the eroded mucosa. By 72 hours post-dosing, the entire mucosa was covered by columnar epithelium, although cells were shorter and had decreased density of microvilli than cells of control animals. A single dose of castor oil consistently produced transient diarrhea associated with neutrophilic inflammation and mucosal erosion in the cecum and ventral colon. Resolution of diarrhea occurred shortly after epithelial restitution." @default.
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• W2162482167 date "1993-05-01" @default.
• W2162482167 modified "2023-09-28" @default.
• W2162482167 title "Morphologic Characterization of Castor Oil-induced Colitis in Ponies" @default.
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• W2162482167 doi "https://doi.org/10.1177/030098589303000305" @default.
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